Publications by authors named "Jinlin Fan"

28 Publications

  • Page 1 of 1

Tracing dissolved organic matter in inflowing rivers of Nansi Lake as a storage reservoir: Implications for water-quality control.

Chemosphere 2021 Jul 21;286(Pt 1):131624. Epub 2021 Jul 21.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao, 266237, PR China. Electronic address:

Quantitative characterization of dissolved organic matter (DOM) in various aquatic ecosystems has become of increasing importance as its transformation plays a key role in inland water carbon, yet few studies have quantified water DOM inputs to storage lakes for water quality control and safety assurance. This study assessed the quantity and quality of DOM in 21 inflow rivers of Nansi Lake as the important storage lake of large-scale water transfer projects by using excitation-emission matrix spectroscopy coupled with parallel factor analysis (EEM-PARAFAC) and ultraviolet-visible (UV-Vis) spectroscopy. The results showed that DOM contents varied significantly with an average value of 5.8 mg L in different inflow rivers, and three fluorescence substances (including UVC humic-like, UVA humic-like and tyrosine-like components) were identified by EEM-PARAFAC. The distribution of the DOM components was distinctively different among sampling sites, and UVA humic-like component mainly dominated in Nansi Lake. Meanwhile, DOM components with higher aromaticity and molecular weight were found in the west side of lake. Fluorescence spectral indexes manifested that the source of DOM was mainly from allochthonous or terrestrial input. Moreover, significant correlations between water quality and DOM characteristics were observed in Nansi Lake. These findings would be beneficial to understand the biogeochemical role and impact of DOM in inflowing rivers in the water-quality monitoring and control of storage lakes.
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http://dx.doi.org/10.1016/j.chemosphere.2021.131624DOI Listing
July 2021

Recent advances in the enhanced nitrogen removal by oxygen-increasing technology in constructed wetlands.

Ecotoxicol Environ Saf 2020 Dec 22;205:111330. Epub 2020 Sep 22.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, China. Electronic address:

Constructed wetland has attracted more and more attention for wastewater purification due to its low construction cost and convenient operation recently. However, the unique waterflooding structure of constructed wetland makes the low dissolved oxygen level, which limits the effect of nitrogen removal in the system. Therefore, it is necessary to develop the oxygen-increasing technology to overcome the drawback in constructed wetlands. In this review, the mechanism of nitrogen removal in constructed wetland is discussed and oxygen is main influence factor is concluded. In addition, oxygen-increasing technologies in recent advances which improve the nitrogen removal efficiency greatly, are emphatically introduced. Finally, some future perspectives about oxygen-increasing techniques are also put forward in order to provide reference for further research and engineering application.
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http://dx.doi.org/10.1016/j.ecoenv.2020.111330DOI Listing
December 2020

Intensive removal of PAHs in constructed wetland filled with copper biochar.

Ecotoxicol Environ Saf 2020 Dec 20;205:111028. Epub 2020 Aug 20.

College of Geography and Environment, Shandong Normal University, Jinan, 250014, China.

In this study, biochar-loading copper ions (Cu-BC), a novel composite for removing phenanthrene very efficiently from water, was prepared using the impregnation method. The performance of constructed wetlands (CWs) with these modified and original biochar as substrates was analyzed. CW with Cu-BC removed a large amount of phenanthrene (94.09 ± 3.02%). According to the surface characteristics analysis, Cu-BC can promote the removal of pollutants via complex absorption, hydrophobic adsorption, increasing the Lewis Pair and electrostatic attraction. Furthermore the higher nitrate removal rate in the treated system (91.11 ± 1.17%) was observed to have higher levels of bacterial metabolic diversity and denitrifier types. The phenanthrene accumulated in plants with this treatment system was enhanced by the role of copper in photosynthesis. It is able to boost the plant extraction of organic matter.
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http://dx.doi.org/10.1016/j.ecoenv.2020.111028DOI Listing
December 2020

Removal of Antibiotics from Aqueous Solutions by a Carbon Adsorbent Derived from Protein-Waste-Doped Biomass.

ACS Omega 2020 Aug 21;5(30):19187-19193. Epub 2020 Jul 21.

School of Environmental Science and Engineering, Shandong Key Laboratory of Water Pollution Control and Resource Reuse, Shandong University, Qingdao 266237, China.

Antibiotic pollution in water is an urgent environmental problem. A novel carbon adsorbent derived from powdery puffed waterfowl feather (PPWF)-doped (PA) was proposed for enhancing the removal of antibiotics from water in this study. Amoxicillin (AMX) and cephalexin (CEX) were selected as typical antibiotics. PPWF-doped (FPAC) and -undoped (PAC) carbon adsorbents were developed to test the adsorption capacities and mechanisms of AMX and CEX. Characterization techniques such as N adsorption/desorption, Fourier transform infrared, X-ray diffraction, scanning electron microscopy, elemental analysis, and Boehm titration were used to determine the properties of adsorbents. Results showed that more microporous structure and surface functional groups are exhibited in FPAC compared to PAC. The nitrogen-containing functional groups were introduced in FPAC. Adsorption capacities at different contact times, pH, and initial concentration were investigated by batch experiments. The AMX and CEX maximum adsorption capacities of FPAC are 25.2 and 30.1% higher than those of PAC, respectively. The kinetic data were well represented by the pseudo-second-order model for AMX and CEX adsorption. The equilibrium data agreed well with the Langmuir model for AMX adsorption and the Freundlich model for CEX adsorption. The adsorption mechanism of AMX and CEX was chemisorption, such as electrostatic attraction and covalent bonding.
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http://dx.doi.org/10.1021/acsomega.0c02568DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7409264PMC
August 2020

Effect of oxygen supply strategy on nitrogen removal of biochar-based vertical subsurface flow constructed wetland: Intermittent aeration and tidal flow.

Chemosphere 2019 May 14;223:366-374. Epub 2019 Feb 14.

School of Environment, Tsinghua University, 100084, Beijing, China.

Insufficient dissolved oxygen (DO) concentration is recognized as one of the major factors limiting efficient nitrogen removal in constructed wetlands (CWs). This study investigated four biochar-based vertical subsurface flow constructed wetlands (VSFCWs) (system I: intermittent aeration without biochar addition; system II: intermittent aeration with biochar addition; system III: tidal flow without biochar addition; system IV: tidal flow with biochar addition) to compare the effect of oxygen supply strategies on the performance and mechanism of nitrogen removal. The results showed that NHN removal efficiencies were 85.83%, 87.88%, 96.19%, and 98.30% for systems I-IV respectively. The abundance of microbes involved in nitrogen transformation also increased in all VSFCWs, particularly in the tidal flow mode with biochar addition. The higher oxygen utilization rate and higher surface area provided by biochar could significantly improve microbial abundance and then enhance nitrogen removal. Most notably, the rate of nitritation (2.92, 3.82, 3.14 and 4.27 mg N L h) was higher than that of nitration (0.51, 0.66, 0.83 and 0.89 mg N L h) in systems I-IV, respectively, and the percentages of NO-N denitrified via simultaneous nitrification denitrification (SND) in systems I-IV were 58.20%, 55.10%, 50.89% and 51.89%, respectively. Therefore, in addition to conventional nitrification denitrification, partial nitrification and SND via NO-N were also the significant nitrogen transformation pathways in the four VSFCWs at high DO concentrations (2.43-6.84 mg L). These results demonstrated that the tidal flow biochar-based VSFCWs performed well in nitrogen removal due to efficient oxygen supplementation and enhanced microbial community abundance.
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http://dx.doi.org/10.1016/j.chemosphere.2019.02.082DOI Listing
May 2019

Enhanced nitrogen removal in biochar-added surface flow constructed wetlands: dealing with seasonal variation in the north China.

Environ Sci Pollut Res Int 2019 Feb 8;26(4):3675-3684. Epub 2018 Dec 8.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, PR China.

In the present study, the performance of surface flow constructed wetlands (SFCWs) added with different dosage of biochar (group A 0%, group B 10%, group C 20%; v/v) was investigated, to evaluate the effect of biochar on nitrogen removal of a constructed wetland. No significant difference was observed in NH-N removal among three groups even during different seasons. Labile organic carbon released from biochar distinctly enhanced denitrification process, which improved NO-N removal efficiency by 4.58% in group B and 10.33% in group C. More importantly, compared with group A, biochar addition increased plant N removal by 82.24% and 192.11% in groups B and C, respectively. This result indicated that biochar could increase the accumulation of plant net biomass. In addition, TN removal of group A was much lower at low temperature (4.9 °C). However, no obvious influence of temperature on TN removal was observed in groups B and C with biochar addition. Microbial community analysis showed that, compared with that in group A, the total relative abundance of the main denitrification bacteria (Proteobacteria, Firmicutes, and Bacteroidetes) increased by 0.81% in group B and 13.63% in group C. These results provide a reasonable strategy for improving the performance of SFCWs under cold climate.
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http://dx.doi.org/10.1007/s11356-018-3895-9DOI Listing
February 2019

Intensified nitrogen transformation in intermittently aerated constructed wetlands: Removal pathways and microbial response mechanism.

Sci Total Environ 2019 Feb 4;650(Pt 2):2880-2887. Epub 2018 Oct 4.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, PR China.

Nitrogen (N) removal processing in vertical flow constructed wetlands (VFCWs) with different designs often varies greatly. Here, a long term VFCWs study for domestic wastewater treatment was carried out to investigate the impact of intermittent aeration and three construction-waste media (common gravel, red brick and fly-ash brick) on N loss, N retention and microbial community. The total nitrogen (TN) removal was significantly higher in aerated VFCWs (91.31%-93.91%) compared with non-aerated VFCWs (12.22%-53.92%), with the highest removal rate in system VI filled with fly-ash brick. Nitrification/denitrification was the main N sink in aerated VFCWs accounting for 36.79%-55.44%, while media storage (8.47%-48.64%) dominated in non-aerated systems because of nitrification limitation. <16% of the TN removal was uptake by plants, and NO emission contributed about 0.08%-0.39%. Microbial study found that functional bacteria increased with intermittently aeration. The analysis revealed the crucial influence of oxygen supply and media on N transformations in VFCWs.
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http://dx.doi.org/10.1016/j.scitotenv.2018.10.037DOI Listing
February 2019

Hepatoprotective activity of Ganoderma lucidum triterpenoids in alcohol-induced liver injury in mice, an iTRAQ-based proteomic analysis.

Food Chem 2019 Jan 18;271:148-156. Epub 2018 Jul 18.

College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; National Engineering Research Center of JUNCAO, Fuzhou 350002, China. Electronic address:

The hepatoprotective activity of ethanol extract of Ganoderma lucidum (GLE) in alcohol-induced liver injury in mice was investigated. HPLC coupled with photo-diode array detector and electrospray ionization-mass spectrometry was used to analyze the major triterpenoids in GLE. The effects of GLE on hepatoprotection were evaluated through histopathology and biochemical analysis of serum enzymes. We used isobaric tag for relative and absolute quantitation (iTRAQ) coupled with tandem mass spectrometry to identify differentially expressed liver proteome in mice. There were more than 4000 differentially expressed proteins; 40 proteins with the most significant changed proteins were applied for further bioinformatics analysis. Expression levels of cytochrome P450 2E1 and alcohol dehydrogenase 1, proteins that are closely associated with these processes, were validated by western blotting. Triterpenoids, major components of GLE, protected alcohol-induced liver injury through inhibiting lipid peroxidation, elevating activity of antioxidant enzymes, and suppressing apoptotic cell death and immune inflammatory response.
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http://dx.doi.org/10.1016/j.foodchem.2018.07.115DOI Listing
January 2019

Effect of trace elements on the development of co-cultured nitrite-dependent anaerobic methane oxidation and methanogenic bacteria consortium.

Bioresour Technol 2018 Nov 31;268:190-196. Epub 2018 Jul 31.

National Engineering Laboratory of Coal-Fired Pollutants Emission Reduction, Shandong University, Jinan, Shandong, China.

The aim of this work was to study the effects of key trace elements (i.e., iron, copper and molybdenum) on the development of co-cultured n-damo and methanogenic bacteria consortium, which could realize in situ CH production and utilization. The results showed that rational dosage, which was 50 mg/L of Fe, 1 mg/L of Cu and 5 mg/L of Mo, significantly stimulated the removal of NO. However, the activity of microbes was noticeably inhibited at 5 mg/L of Cu and 1 mg/L of Mo. Microbial community analysis indicated that the abundances of n-damo bacteria and methanogens showed a positive response to the rational dosage. Furthermore, the expression of key functional genes was enhanced under the rational dosage condition.
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http://dx.doi.org/10.1016/j.biortech.2018.07.139DOI Listing
November 2018

Preparation and evaluation of wetland plant-based biochar for nitrogen removal enhancement in surface flow constructed wetlands.

Environ Sci Pollut Res Int 2018 May 7;25(14):13929-13937. Epub 2018 Mar 7.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, People's Republic of China.

In the present study, biochar was prepared from scrap wetland macrophyte Arundo donax at different temperatures and then was evaluated for its feasibility as substrate to enhance nitrogen removal performance of surface flow constructed wetlands (SFCWs). Three groups of SFCW systems with different addition of biochar (0, 10, 20%, v/v) were constructed to investigate the effect of dissolved organic matter (DOM) released from biochar on nitrogen transformation. Results showed that the concentration of DOM released from biochar widely ranged from 6.01 to 125.67 mg L, and the DOM amount decreased with increasing pyrolysis temperature. Five humic acid-like components of DOM were identified by the parallel factor analysis (PARAFAC) model. The release capacity of DOM from biochar is observed to be closely related to microbial nitrogen removal efficiency. Enhanced removal efficiencies of NO-N (81.16%) and total nitrogen (85.62%) were achieved in SFCWs with 20% biochar, which was higher than SFCWs with 10% biochar (62.74 and 73.83%) and the control groups with no biochar (36.16 and 57.90%), respectively. Increased plant height in SFCWs with more biochar addition confirmed the positive effect of biochar on plant growth. Results from the present study suggested that the application of wetland plant-derived biochar was a promising strategy to enhance treatment performance and utilization of waste biomass resource in SFCWs.
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http://dx.doi.org/10.1007/s11356-018-1597-yDOI Listing
May 2018

A novel aerated surface flow constructed wetland using exhaust gas from biological wastewater treatment: Performance and mechanisms.

Bioresour Technol 2018 Feb 18;250:94-101. Epub 2017 Sep 18.

Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 27 Shanda Nanlu, Jinan 250100, Shandong, PR China.

In this study, a novel aerated surface flow constructed wetland (SFCW) using exhaust gas from biological wastewater treatment was investigated. Compared with un-aerated SFCW, the introduction of exhaust gas into SFCW significantly improved NH-N, TN and COD removal efficiencies by 68.30 ± 2.06%, 24.92 ± 1.13% and 73.92 ± 2.36%, respectively. The pollutants removal mechanism was related to the microbial abundance and the highest microbial abundance was observed in the SFCW with exhaust gas because of the introduction of exhaust gas from sequencing batch reactor (SBR), and thereby optimizing nitrogen transformation processes. Moreover, SFCW would significantly mitigate the risk of exhaust gas pollution. SFCW removed 20.00 ± 1.23%, 34.78 ± 1.39%, and 59.50 ± 2.33% of HS, NH and NO in the exhaust gas, respectively. And 31.32 ± 2.23% and 32.02 ± 2.86% of bacterial and fungal aerosols in exhaust gas were also removed through passing SFCW, respectively.
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http://dx.doi.org/10.1016/j.biortech.2017.08.172DOI Listing
February 2018

Secondary effluent purification by a large-scale multi-stage surface-flow constructed wetland: A case study in northern China.

Bioresour Technol 2018 Feb 2;249:1092-1096. Epub 2017 Nov 2.

National Engineering Laboratory of Coal-Fired Pollutants Emission Reduction, Shandong University, Jinan 250061, PR China.

Assessment of treatment performance in the large-scale constructed wetland (CW) for secondary effluent purification remains limited. The aim of this case study was to therefore to investigate the long-term treatment capacity of organics and ammonium pollutants in a large-scale multi-stage surface-flow (SF) CW fed with secondary effluents from the wastewater treatment plants (WWTPs) in northern China. The results for two-and-half-year study period indicated that the water quality parameters including chemical oxygen demand (COD) and ammonium (NH-N) met the Chinese Grade III of Environmental Quality Standards. The mass reductions of COD and NH-N were 53% (4032 kg ha y) and 72% (511 kg ha y), respectively. However, there was a significant positive correlation between influent loads and treatment performance. The optimal loading of 2.5 g m d for COD and 0.3 g m d for NH-N could be recommended for designing the sustainable large-scale multi-stage SF CW wastewater treatments.
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http://dx.doi.org/10.1016/j.biortech.2017.10.099DOI Listing
February 2018

Anaerobic digestion of spent mushroom substrate under thermophilic conditions: performance and microbial community analysis.

Appl Microbiol Biotechnol 2018 Jan 28;102(1):499-507. Epub 2017 Oct 28.

National Engineering Research Center of JUNCAO Technology, Fuzhou, Fujian, 350002, China.

Spent mushroom substrate (SMS) is the residue of edible mushroom production occurring in huge amounts. The SMS residue can be digested for biogas production in the mesophilic anaerobic digestion. In the present study, performance of batch thermophilic anaerobic digestion (TAD) of SMS was investigated as well as the interconnected microbial population structure changes. The analyzed batch TAD process lasted for 12 days with the cumulative methane yields of 177.69 mL/g volatile solid (VS). Hydrolytic activities of soluble sugar, crude protein, and crude fat in SMS were conducted mainly in the initial phase, accompanied by the excessive accumulation of volatile fatty acids and low methane yield. Biogas production increased dramatically from days 4 to 6. The degradation rates of cellulose and hemicellulose were 47.53 and 55.08%, respectively. The high-throughput sequencing of 16S rRNA gene amplicons revealed that Proteobacteria (56.7%-62.8%) was the dominant phylum in different fermentative stages, which was highly specific compared with other anaerobic processes of lignocellulosic materials reported in the literature. Crenarchaeota was abundant in the archaea. The most dominant genera of archaea were retrieved as Methanothermobacter and Methanobacterium, but the latter decreased sharply with time. This study shows that TAD is a feasible method to handle the waste SMS.
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http://dx.doi.org/10.1007/s00253-017-8578-9DOI Listing
January 2018

Large-scale multi-stage constructed wetlands for secondary effluents treatment in northern China: Carbon dynamics.

Environ Pollut 2018 Feb 11;233:933-942. Epub 2017 Oct 11.

School of Civil and Environmental Engineering, University of Technology Sydney, Broadway, NSW 2007, Australia.

Multi-stage constructed wetlands (CWs) have been proved to be a cost-effective alternative in the treatment of various wastewaters for improving the treatment performance as compared with the conventional single-stage CWs. However, few long-term full-scale multi-stage CWs have been performed and evaluated for polishing effluents from domestic wastewater treatment plants (WWTP). This study investigated the seasonal and spatial dynamics of carbon and the effects of the key factors (input loading and temperature) in the large-scale seven-stage Wu River CW polishing domestic WWTP effluents in northern China. The results indicated a significant improvement in water quality. Significant seasonal and spatial variations of organics removal were observed in the Wu River CW with a higher COD removal efficiency of 64-66% in summer and fall. Obvious seasonal and spatial variations of CH and CO emissions were also found with the average CH and CO emission rates of 3.78-35.54 mg m d and 610.78-8992.71 mg m d, respectively, while the higher CH and CO emission flux was obtained in spring and summer. Seasonal air temperatures and inflow COD loading rates significantly affected organics removal and CH emission, but they appeared to have a weak influence on CO emission. Overall, this study suggested that large-scale Wu River CW might be a potential source of GHG, but considering the sustainability of the multi-stage CW, the inflow COD loading rate of 1.8-2.0 g m d and temperature of 15-20 °C may be the suitable condition for achieving the higher organics removal efficiency and lower greenhouse gases (GHG) emission in polishing the domestic WWTP effluent. The obtained knowledge of the carbon dynamics in large-scale Wu River CW will be helpful for understanding the carbon cycles, but also can provide useful field experience for the design, operation and management of multi-stage CW treatments.
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http://dx.doi.org/10.1016/j.envpol.2017.09.048DOI Listing
February 2018

Enhanced phosphorus removal in intermittently aerated constructed wetlands filled with various construction wastes.

Environ Sci Pollut Res Int 2017 Oct 13;24(28):22524-22534. Epub 2017 Aug 13.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan, 250100, People's Republic of China.

Phosphorus (P) loss by various pathways in constructed wetlands (CWs) is often variable. The effects of intermittent aeration and different construction waste substrates (gravel, red brick, fly-ash brick) on P processing using six batch-operated vertical flow constructed wetlands (VFCWs) were studied for decentralized domestic wastewater treatment. Average removal of total phosphorus (TP) in three aerated CWs was markedly higher (21.06, 24.83, and 27.02 mg m day, respectively) than non-aerated CWs (10.64, 18.16, and 25.09 mg m day, respectively). Fly-ash brick offered superior TP removal efficiency in both aerated and non-aerated batch-operated VFCWs, suggesting its promising application for P removal in CWs. Aeration greatly promoted plant growth and thusly increased plant uptake of P by 0.57-1.45 times. Substance storage was still the main P sink accounting for 23.92-59.47% of TP removal. Other process including microbial uptake was revealed to be a very important P removal pathway (accounting for 14.86-34.84%). The contribution of microbial uptake was also indicated by microbial analysis. Long-term results suggested that the contribution of microbial P uptake could be always ignored and underestimated in most CWs. A combination of intermittent aeration and suitable substrates is effective to intensify P transformation in CWs.
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http://dx.doi.org/10.1007/s11356-017-9870-zDOI Listing
October 2017

Enhancement of surface flow constructed wetlands performance at low temperature through seasonal plant collocation.

Bioresour Technol 2017 Jan 4;224:222-228. Epub 2016 Nov 4.

National Engineering Laboratory of Coal-Fired Pollutants Emission Reduction, Shandong University, Jinan 250061, PR China.

In the present study, a novel seasonal plant collocation system (SPCS), specifically the Potamogeton crispus and Phragmites australis series system, was investigated to enhance the performance of surface flow constructed wetlands (SFCWs) at low temperature. Results of a year-round experiment showed that SPCS conquered the adverse effect of low temperature and achieved sustainable nutrients removal. In addition, during winter, removal efficiencies of NH-N, TP, COD, and TN in SPCS were 18.1%, 17.6%, 10.1% and 5.2% higher than that in the control, respectively. P. crispus and P. australis complemented each other in terms of plant growth and plant uptake during the experiment period. Furthermore, it emerged that P. crispus could increase the quantity of ammonia oxidizing bacteria by 10.2%, due to its high oxygen enrichment ability. It is suggested that seasonal plant collocation has a promising future in SFCWs of areas being affected by climate change, e.g. northern China.
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http://dx.doi.org/10.1016/j.biortech.2016.11.006DOI Listing
January 2017

Improving low-temperature performance of surface flow constructed wetlands using Potamogeton crispus L. plant.

Bioresour Technol 2016 Oct 29;218:1257-60. Epub 2016 Jun 29.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, PR China.

In this study, enhanced organics and nitrogen removal efficiency in SFCWs by different submerged plants for polluted river water treatment under cold temperature was evaluated. High average removal efficiencies of COD (92.45%), NH4(+)-N (93.70%) and TN (55.62%) were achieved in experimental SFCWs with Potamogeton crispus compared with SFCWs with other plants. SFCWs with underground Phragmites australis root also presented better performance than the unplanted systems, indicating its positive role of contamination removal in winter. The results of this study indicated SFCWs with hardy submerged plant P. crispus could be a more effective and sustainable strategy for removing organics and nitrogen in shallow nutrient enriched river water ecosystems under cold climate.
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http://dx.doi.org/10.1016/j.biortech.2016.06.110DOI Listing
October 2016

Enhanced long-term organics and nitrogen removal and associated microbial community in intermittently aerated subsurface flow constructed wetlands.

Bioresour Technol 2016 Aug 24;214:871-875. Epub 2016 May 24.

College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China. Electronic address:

The long-term enhanced removal efficiency of organics and nitrogen in subsurface flow constructed wetlands (SSF CWs) with and without intermittent aeration for decentralized domestic wastewater was evaluated, and the function of intermittent aeration on microbial community was also investigated in this study. The high and long-term 95.6% COD, 96.1% NH4(+)-N and 85.8% TN removal efficiencies were achieved in experimental intermittently aerated SSF CW compared with non-aerated SSF CW. Aerated SSF CWs also exhibited the excellent removal performance when comparatively comparing with other strategies and techniques applied in CWs. In addition, fluorescence in situ hybridization (FISH) analysis revealed that associated microbial abundance significantly increased owing to intermittent aeration. These results indicated intermittent aeration CWs might be an effective and sustainable strategy for wastewater treatment in rural areas, but require further full-scale investigation in future.
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http://dx.doi.org/10.1016/j.biortech.2016.05.083DOI Listing
August 2016

Optimizations on supply and distribution of dissolved oxygen in constructed wetlands: A review.

Bioresour Technol 2016 Aug 5;214:797-805. Epub 2016 May 5.

College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.

Dissolved oxygen (DO) is one of the most important factors that can influence pollutants removal in constructed wetlands (CWs). However, problems of insufficient oxygen supply and inappropriate oxygen distribution commonly exist in traditional CWs. Detailed analyses of DO supply and distribution characteristics in different types of CWs were introduced. It can be concluded that atmospheric reaeration (AR) served as the promising point on oxygen intensification. The paper summarized possible optimizations of DO in CWs to improve its decontamination performance. Process (tidal flow, drop aeration, artificial aeration, hybrid systems) and parameter (plant, substrate and operating) optimizations are particularly discussed in detail. Since economic and technical defects are still being cited in current studies, future prospects of oxygen research in CWs terminate this review.
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http://dx.doi.org/10.1016/j.biortech.2016.05.003DOI Listing
August 2016

Intensified organics and nitrogen removal in the intermittent-aerated constructed wetland using a novel sludge-ceramsite as substrate.

Bioresour Technol 2016 Jun 23;210:101-7. Epub 2016 Jan 23.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, PR China.

In this study, a novel sludge-ceramsite was applied as main substrate in intermittent-aerated subsurface flow constructed wetlands (SSF CWs) for treating decentralized domestic wastewater, and intensified organics and nitrogen removal in different SSF CWs (with and without intermittent aeration, with and without sludge-ceramsite substrate) were evaluated. High removal of 97.2% COD, 98.9% NH4(+)-N and 85.8% TN were obtained simultaneously in the intermittent-aerated CW system using sludge-ceramsite substrate compared with non-aerated CWs. Moreover, results from fluorescence in situ hybridization (FISH) analysis revealed that the growth of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) in the intermittent-aerated CW system with sludge-ceramsite substrate was enhanced, thus indicating that the application of intermittent aeration and sludge-ceramsite plays an important role in nitrogen transformations. These results suggest that a combination of intermittent aeration and sludge-ceramsite substrate is reliable to enhance the treatment performance in SSF CWs.
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http://dx.doi.org/10.1016/j.biortech.2016.01.051DOI Listing
June 2016

Strategies and techniques to enhance constructed wetland performance for sustainable wastewater treatment.

Environ Sci Pollut Res Int 2015 Oct 14;22(19):14637-50. Epub 2015 Aug 14.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan, 250100, People's Republic of China.

Constructed wetlands (CWs) have been used as an alternative to conventional technologies for wastewater treatment for more than five decades. Recently, the use of various modified CWs to improve treatment performance has also been reported in the literature. However, the available knowledge on various CW technologies considering the intensified and reliable removal of pollutants is still limited. Hence, this paper aims to provide an overview of the current development of CW strategies and techniques for enhanced wastewater treatment. Basic information on configurations and characteristics of different innovations was summarized. Then, overall treatment performance of those systems and their shortcomings were further discussed. Lastly, future perspectives were also identified for specialists to design more effective and sustainable CWs. This information is used to inspire some novel intensifying methodologies, and benefit the successful applications of potential CW technologies.
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http://dx.doi.org/10.1007/s11356-015-5151-xDOI Listing
October 2015

Decentralized domestic wastewater treatment using intermittently aerated vertical flow constructed wetlands: impact of influent strengths.

Bioresour Technol 2015 Jan 15;176:163-8. Epub 2014 Nov 15.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, PR China.

In this study, the removal performances of organic pollutants and nitrogen in vertical flow constructed wetlands (VFCWs) with and without intermittent aeration fed with different strengths of influent were evaluated as a possible treatment for decentralized domestic wastewater in northern China. The intermittent aeration strategy not only significantly increased removal efficiencies of organic pollutants and ammonium nitrogen (NH4(+)-N), but also successfully created alternate aerobic and anaerobic conditions resulting in high total nitrogen (TN) removal. Moreover, increasing influent strength did not affect the removal efficiencies of organic matters and nitrogen in aerated VFCWs. Compared with non-aerated VFCWs, much higher removal of organic pollutants (96%), NH4(+)-N (98%), and TN (85%) was obtained simultaneously in intermittent aeration VFCWs, especially at high influent strengths. The results suggest that the intermittent aeration could be an appropriate strategy for achieving the high removal performance in VFCWs, especially for in-situ treatment of high strength decentralized domestic wastewaters.
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http://dx.doi.org/10.1016/j.biortech.2014.11.041DOI Listing
January 2015

A review on the sustainability of constructed wetlands for wastewater treatment: Design and operation.

Bioresour Technol 2015 Jan 25;175:594-601. Epub 2014 Oct 25.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, PR China.

Constructed wetlands (CWs) have been used as a green technology to treat various wastewaters for several decades. CWs offer a land-intensive, low-energy, and less-operational-requirements alternative to conventional treatment systems, especially for small communities and remote locations. However, the sustainable operation and successful application of these systems remains a challenge. Hence, this paper aims to provide and inspire sustainable solutions for the performance and application of CWs by giving a comprehensive review of CWs' application and the recent development on their sustainable design and operation for wastewater treatment. Firstly, a brief summary on the definition, classification and application of current CWs was presented. The design parameters and operational conditions of CWs including plant species, substrate types, water depth, hydraulic load, hydraulic retention time and feeding mode related to the sustainable operation for wastewater treatments were then discussed. Lastly, future research on improving the stability and sustainability of CWs were highlighted.
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http://dx.doi.org/10.1016/j.biortech.2014.10.068DOI Listing
January 2015

Examination of oxygen release from plants in constructed wetlands in different stages of wetland plant life cycle.

Environ Sci Pollut Res Int 2014 30;21(16):9709-16. Epub 2014 Apr 30.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan, 250100, People's Republic of China.

The quantification of oxygen release by plants in different stages of wetland plant life cycle was made in this study. Results obtained from 1 year measurement in subsurface wetland microcosms demonstrated that oxygen release from Phragmites australis varied from 108.89 to 404.44 mg O₂/m(2)/d during the different periods from budding to dormancy. Plant species, substrate types, and culture solutions had a significant effect on the capacity of oxygen release of wetland plants. Oxygen supply by wetland plants was estimated to potentially support a removal of 300.37 mg COD/m(2)/d or 55.87 mg NH₄-N/m(2)/d. According to oxygen balance analysis, oxygen release by plants could provide 0.43-1.12% of biochemical oxygen demand in typical subsurface-flow constructed wetlands (CWs). This demonstrates that oxygen release of plants may be a potential source for pollutants removal especially in low-loaded CWs. The results make it possible to quantify the role of plants in wastewater purification.
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http://dx.doi.org/10.1007/s11356-014-2905-9DOI Listing
June 2015

Comparative quantification of oxygen release by wetland plants: electrode technique and oxygen consumption model.

Environ Sci Pollut Res Int 2014 Jan 20;21(2):1071-8. Epub 2013 Jul 20.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan, 250100, People's Republic of China.

Understanding oxygen release by plants is important to the design of constructed wetlands for wastewater treatment. Lab-scale systems planted with Phragmites australis were studied to evaluate the amount of oxygen release by plants using electrode techniques and oxygen consumption model. Oxygen release rate (0.14 g O2/m(2)/day) measured using electrode techniques was much lower than that (3.94-25.20 gO2/m(2)/day) calculated using the oxygen consumption model. The results revealed that oxygen release by plants was significantly influenced by the oxygen demand for the degradation of pollutants, and the oxygen release rate increased with the rising of the concentration of degradable materials in the solution. The summary of the methods in qualifying oxygen release by wetland plants demonstrated that variations existed among different measuring methods and even in the same measuring approach. The results would be helpful for understanding the contribution of plants in constructed wetlands toward actual wastewater treatment.
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http://dx.doi.org/10.1007/s11356-013-1984-3DOI Listing
January 2014

Nitrogen removal in intermittently aerated vertical flow constructed wetlands: impact of influent COD/N ratios.

Bioresour Technol 2013 Sep 19;143:461-6. Epub 2013 Jun 19.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, PR China.

The performance response of eight vertical flow constructed wetlands (VFCWs) to different influent COD/N ratios and intermittent aeration in domestic wastewater treatment was investigated. Almost complete nitrification was obtained by intermittent aeration, which well developed alternate anaerobic and aerobic conditions for nitrification and denitrification. Sufficient carbon source supply resulted from influent COD/N ratio of 10 simultaneously obtained high removals of COD (96%), ammonia nitrogen (99%) and total nitrogen (90%) in intermittently aerated VFCWs. In all non-aerated VFCWs, poor nitrification was observed due to oxygen deficiency whilst high COD/N ratios further led to lower COD and nitrogen removal efficiency. The results suggest that intermittent aeration combined with high influent COD/N ratios could achieve high nitrogen removal in VFCWs.
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http://dx.doi.org/10.1016/j.biortech.2013.06.038DOI Listing
September 2013

Intermittent aeration strategy to enhance organics and nitrogen removal in subsurface flow constructed wetlands.

Bioresour Technol 2013 Aug 19;141:117-22. Epub 2013 Mar 19.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, PR China.

In this study, an intermittent-aerated subsurface flow constructed wetland (SFCW) A was set up to assess its performance in decentralized rural sewage treatment. A conventional SFCW B and a subsurface wastewater infiltration system (SWIS C) were also constructed for comparison. Alternate anaerobic and aerobic conditions were well developed by intermittent aeration. High removal of organic pollutants (29.3 gm(-2) d(-1)), ammonium nitrogen (3.5 gm(-2) d(-1)) and total nitrogen (3.3 gm(-2) d(-1)) were obtained simultaneously in SFCW A compared with SFCW B and SWIS C. Fluorescence in situ hybridization analysis proved that the intermittent aeration obviously enhanced the growth of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) in SFCW A. These results suggest that intermittent aeration strategy is reliable to enhance the performance of SFCWs in decentralized rural sewage treatment.
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http://dx.doi.org/10.1016/j.biortech.2013.03.077DOI Listing
August 2013

Enhanced organics and nitrogen removal in batch-operated vertical flow constructed wetlands by combination of intermittent aeration and step feeding strategy.

Environ Sci Pollut Res Int 2013 Apr 2;20(4):2448-55. Epub 2012 Sep 2.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, People's Republic of China.

Oxygen and carbon source supply are usually insufficient in subsurface flow constructed wetlands. Simultaneous removal of organic pollutants and nitrogen in five batch-operated vertical flow constructed wetlands under different operating conditions was investigated. Alternate aerobic and anaerobic regions were created well with intermittent aeration. Four-month experiments showed that the wetland-applied intermittent aeration combined with step feeding strategy (reactor E) greatly improved the removal of organics, ammonium nitrogen (NH4-N), and total nitrogen (TN) simultaneously, which were 97, 96, and 82%, respectively. It was much better than non-aerated reactors A and B and outperformed intermittently aerated reactor D without step feeding. Continuous aeration (reactor C) significantly enhanced the organics removal and nitrification, but it limited the TN removal (29%) seriously as a result of low denitrification level, and the high operation cost remained a question. The effect of plants was confirmed in this study, and the monitoring data showed that the plants could grow normally. Intermittent aeration as well as step feeding had no obvious influence on the growth of wetland plants in this study.
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http://dx.doi.org/10.1007/s11356-012-1130-7DOI Listing
April 2013
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