Publications by authors named "Bhagyashree Tiwari"

7 Publications

  • Page 1 of 1

Food waste valorization: Energy production using novel integrated systems.

Bioresour Technol 2021 Feb 19;322:124538. Epub 2020 Dec 19.

INRS Eau, Terre et Environnement, 490, rue de la Couronne, Québec G1K 9A9, Canada.

Management of food waste (FW) is a global challenge due to increasing population and economic activities. Presently, landfill and incineration are the keyways of FW management, while economical and environmental sustainability have been an issue. Therefore, the biological processes have been investigated for resource and energy recovery from FW. However, these biological approaches have certain drawbacks and cannot be a complete solution for FW management. Therefore, this review aims to offer a detailed and complete analysis of current available technologies to achieve environmental and economical sustainability. In this context, zero solid waste discharge for resource and energy recovery has been put into view. Corresponding to which several innovative technologies using integrated biological methods for resource and energy recovery from FW have been elucidated.
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http://dx.doi.org/10.1016/j.biortech.2020.124538DOI Listing
February 2021

Acclimatization of microbial community of submerged membrane bioreactor treating hospital wastewater.

Bioresour Technol 2021 Jan 8;319:124223. Epub 2020 Oct 8.

Investissement Québec - CRIQ, 333, rue Franquet, Quebec, QC G1P 4C7, Canada.

This study was performed to understand the dynamics of the microbial community of submerged membrane bioreactor during the acclimatization process to treat the hospital wastewater. In this regard, three acclimatization phases were examined using a mixture of synthetic wastewater (SWW) and real hospital wastewater (HWW) in the following proportions; In Phase 1: 75:25 v/v (SWW: HWW); Phase 2: 50:50 v/v (SWW: HWW); and Phase 3: 25:75 v/v (SWW: HWW) of wastewater. The microbial community was analyzed using Illumina high throughput sequencing to identify the bacterial and micro-eukaryotes community in SMBR. The acclimatization study clearly demonstrated that shift in microbial community composition with time. The dominance of pathogenic and degrading bacterial communities such as Mycobacterium, Pseudomonas, and Zoogloea was observed at the phase 3 of acclimatization. This study witnessed the major shift in the micro-eukaryotes community, and the proliferation of fungi Basidiomycota was observed in phase 3 of acclimatization.
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http://dx.doi.org/10.1016/j.biortech.2020.124223DOI Listing
January 2021

The bacterial community structure of submerged membrane bioreactor treating synthetic hospital wastewater.

Bioresour Technol 2019 Aug 18;286:121362. Epub 2019 Apr 18.

Centre de Recherche Industrielle du Québec (CRIQ), Quebec, QC, Canada.

The pharmaceuticals are biologically active compounds used to prevent and treat diseases. These pharmaceutical compounds were not fully metabolized by the human body and thus excreted out in the wastewater stream. Thus, the study on the treatment of synthetic hospital wastewater containing pharmaceuticals (ibuprofen, carbamazepine, estradiol and venlafaxine) was conducted to understand the variation of the bacterial community in a submerged membrane bioreactor (SMBR) at varying hydraulic retention time (HRT) of 6, 12 and 18 h. The variation in bacterial community dynamics of SMBR was studied using high throughput sequencing. The removal of pharmaceuticals was uniform at varying HRT. The removal of both ibuprofen and estradiol was accounted for 90%, whereas a lower removal of venlafaxine (<10%) and carbamazepine (>5%) in SMBR was observed. The addition of pharmaceuticals alters the bacterial community structure and result in increased abundance of bacteria (e.g., Flavobacterium, Pedobacter, and Methylibium) reported to degrade toxic pollutant.
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http://dx.doi.org/10.1016/j.biortech.2019.121362DOI Listing
August 2019

Recent developments of downstream processing for microbial lipids and conversion to biodiesel.

Bioresour Technol 2018 May 1;256:515-528. Epub 2018 Feb 1.

INRS Eau, Terre et Environnement, 490, rue de la Couronne, Québec G1K 9A9, Canada. Electronic address:

With increasing global population and depleting resources, there is an apparent demand for radical unprecedented innovation to satisfy the basal needs of lives. Hence, non-conventional renewable energy resources like biodiesel have been worked out in past few decades. Biofuel (e.g. Biodiesel) serves to be the most sustainable answer to solve "food vs. fuel crisis". In biorefinery process, lipid extraction from oleaginous microbial lipids is an integral part as it facilitates the release of fatty acids. Direct lipid extraction from wet cell-biomass is favorable in comparison to dry-cell biomass because it eliminates the application of expensive dehydration. However, this process is not commercialized yet, instead, it requires intensive research and development in order to establish robust approaches for lipid extraction that can be practically applied on an industrial scale. This review aims for the critical presentation on cell disruption, lipid recovery and purification to support extraction from wet cell-biomass for an efficient transesterification.
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http://dx.doi.org/10.1016/j.biortech.2018.01.129DOI Listing
May 2018

Synthetic hospital wastewater treatment by coupling submerged membrane bioreactor and electrochemical advanced oxidation process: Kinetic study and toxicity assessment.

Chemosphere 2018 Feb 4;193:160-169. Epub 2017 Nov 4.

Centre de Recherche Industrielle du Québec (CRIQ), 333 Franquet, Québec City, QC, G1P 4C7, Canada.

In this work, the combination of membrane bioreactor (MBR) and electro-oxidation (EO) process was studied for the treatment of a synthetic hospital wastewater fortified with four pharmaceutical pollutants namely carbamazepine (CBZ), ibuprofen (IBU), estradiol (E-E) at a concentration of 10 μg L venlafaxine (VEN) at 0.2 μg L. Two treatment configurations were studied: EO process as pre-treatment and post-treatment. Wastewater treatment with MBR alone shows high removal percentages of IBU and E-E (∼90%). Unlikely for CBZ and VEN, a low elimination percentage (∼10%) was observed. The hydraulic and the solid retention times (HRT and SRT) were 18 h and 140 d respectively, while the biomass concentration in the MBR was 16.5 g L. To enhance pharmaceuticals elimination, an EO pretreatment was conducted during 40 min at 2 A. This configuration allowed a 92% removal for VEN, which was far greater than both treatments alone, with lower than 30% and 50% for MBR and EO, respectively. The MBR-EO coupling (EO as post-treatment) allows high removal percentages (∼97%) of the four pharmaceutical pollutants after 40 min of treatment at a current intensity of 0.5 A with Nb/BDD as electrodes. This configuration appears to be very effective compared to the first configuration (EO-MBR) where EO process is used as a pre-treatment. Toxicity assessment showed that the treated effluent of this configuration is not toxic to Daphnia magna except at 100% v/v. The MBR-EO coupling appears to be a promising treatment for contaminated hospital effluents.
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http://dx.doi.org/10.1016/j.chemosphere.2017.11.010DOI Listing
February 2018

Review on fate and mechanism of removal of pharmaceutical pollutants from wastewater using biological approach.

Bioresour Technol 2017 Jan 15;224:1-12. Epub 2016 Nov 15.

Centre de Recherche Industrielle du Québec (CRIQ), Québec (Québec), Canada.

Due to research advancement and discoveries in the field of medical science, maintains and provides better human health and safer life, which lead to high demand for production of pharmaceutical compounds with a concomitant increase in population. These pharmaceutical (biologically active) compounds were not fully metabolized by the body and excreted out in wastewater. This micro-pollutant remains unchanged during wastewater treatment plant operation and enters into the receiving environment via the discharge of treated water. Persistence of pharmaceutical compounds in both surface and ground waters becomes a major concern due to their potential eco-toxicity. Pharmaceuticals (emerging micro-pollutants) deteriorate the water quality and impart a toxic effect on living organisms. Therefore, from last two decades, plenty of studies were conducted on the occurrence, impact, and removal of pharmaceutical residues from the environment. This review provides an overview on the fate and removal of pharmaceutical compounds via biological treatment process.
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http://dx.doi.org/10.1016/j.biortech.2016.11.042DOI Listing
January 2017

Biodegradation and dissolution of polyaromatic hydrocarbons by Stenotrophomonas sp.

Bioresour Technol 2016 Sep 16;216:1102-5. Epub 2016 Jun 16.

Department of Applied Sciences, Indian Institute of Information Technology, Allahabad, India.

The aim of this work was to study the biodegradation capabilities of a locally isolated bacterium, Stenotrophomonas sp. strain IITR87 to degrade the polycyclic aromatic hydrocarbons and also check the preferential biodegradation of polycyclic aromatic hydrocarbons (PAHs). From preferential substrate degradation studies, it was found that Stenotrophomonas sp. strain IITR87 first utilized phenanthrene (three membered ring), followed by pyrene (four membered ring), then benzo[α]pyrene (five membered ring). Dissolution study of PAHs with surfactants, rhamnolipid and tritonX-100 showed that the dissolution of PAHs increased in the presence of surfactants.
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http://dx.doi.org/10.1016/j.biortech.2016.06.047DOI Listing
September 2016
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