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Membrane Bioreactor

M C Martí-Calatayud, S Schneider, S Yüce, M Wessling
Fouling is one of the most pressing limitations during operation of membrane bioreactors, as it increases operating costs and is the cause of short membrane lifespans. Conducting effective physical cleanings is thus essential for keeping membrane operation above viable performance limits. The nature of organic foulants present in the sludge and the membrane properties are among the most influential factors determining fouling development and thus, efficiency of fouling mitigation approaches. The role of other factors like sludge viscosity on fouling is still unclear, given that contradictory effects have been reported in the literature...
October 10, 2018: Water Research
Liangchang Zhang, Ting Li, Weidang Ai, Chunyan Zhang, Yongkang Tang, Qingni Yu, Yinghui Li
Water management subsystem (WMS) is a major component of the controlled ecological life support system (CELSS). For guaranteeing the water requirement of crop growth and crewmember's daily life, a WMS was established in a 4 person 180-day integrated experiment (carried out in Shenzhen, China, 2016) to maintain a closed cycle with a total water amount of ~23 m3 . The design and operation of the WMS was summarized as follows: (1) Collection and allocation of condensate water. About 917 L/d condensate water (>98% was from plants' evapotranspiration) was collected, and ~866 L/d of which was reused as plant nutrient solution after ultraviolet (UV) disinfection, and 50...
October 9, 2018: Science of the Total Environment
Defei Liu, Xin Chen, Bin Bian, Zhiping Lai, Yue Situ
Membrane bioreactors (MBRs) with polymeric/ceramic microfiltration (MF) membranes have been commonly used for wastewater treatment today. However, membrane biofouling often results in a dramatically-reduced service life of MF membranes, which limits the application of this technology. In this study, Cu hollow fiber membranes (Cu-HFMs) with low resistivity (104.8-309.8 nΩ·m) and anti-biofouling properties were successfully synthesized. Further analysis demonstrated that Cu-HFMs reduced at 625°C achieved the bimodal pore size distribution of ~1 μm and a porosity of 46%, which enable high N2 permeance (1...
2018: Frontiers in Chemistry
Huifang Sun, Hang Liu, Siyu Wang, Fangqin Cheng, Yu Liu
Ceramic membrane bioreactor (MBR) has attracted increasing interest due to its high flux, long membrane life-span and excellent resistance to hash operation conditions. Although ozone has been used for chemical cleaning of ceramic membranes, it is still unclear about the role of dissolved organic matter (DOM) generated during on-line chemical cleaning with ozone in the development of membrane fouling in ceramic MBR. This study clearly revealed that the released DOM could considerably induce irreversible membrane fouling, and humic acid like-substances (HAL) with molecular weight (MW) of about 500 Da were mainly responsible for the observed membrane fouling...
September 7, 2018: Water Research
Jian-Kai Jiang, Yang Mu, Han-Qing Yu
Microbial extracellular polymeric substances (EPS) with a high polysaccharides content contribute to membrane fouling in membrane bioreactors. Sodium alginate (Alg) has been widely used as a substitute for polysaccharides in EPS to study membrane fouling; however, the rational for such a substitute is unclear and remains to be verified. In this work, the differences in the colloid properties of Alg-Ca2+ and EPS-Ca2+ were explored by integrating rheometry and dynamic light scattering with regard to distinct membrane fouling behaviors...
October 3, 2018: Journal of Colloid and Interface Science
Akira Hafuka, Riho Mashiko, Ryuto Odashima, Hiroshi Yamamura, Hisashi Satoh, Yoshimasa Watanabe
This study evaluates the performance of an anaerobic membrane bioreactor (AnMBR) digesting waste activated sludge. A digestion reactor equipped with an external hollow fiber microfiltration membrane module was operated in continuous-mode for 248 days. The system demonstrated 56% volatile solids degradation at an organic loading rate of 0.40 g-VS/(L·d) in 15 days of hydraulic retention time. The average methane content in the biogas produced was 76% which is considerably high compared to that from a typical continuously stirred tank reactor...
October 2, 2018: Bioresource Technology
Xiang Mei, Juan Liu, Zhongwei Guo, Pengpeng Li, Shuqi Bi, Yong Wang, Yang Yang, Wentian Shen, Yihan Wang, Yanyan Xiao, Xu Yang, Baochang Zhou, Hao Liu, Shuai Wu
The chemical p-nitrophenol (PNP) is a priority pollutant, and PNP wastewater is highly toxic and resistant to biodegradation. The traditional physical and chemical methods (adsorption, extraction, and oxidation) for treating PNP wastewater have the disadvantages of complicated processes, high costs and secondary pollution generation. In this study, two integrated membrane-aerated bioreactor systems (RA and RB) with anoxic and aerated zones were constructed to enhance PNP biodegradation. The results showed that a helical silicone rubber membrane module displayed a high oxygen supply rate under a low membrane aeration pressure, and the hydraulic flow state of the reactor approached ideal mixing...
September 29, 2018: Journal of Hazardous Materials
Ana D Martin-Ryals, Lance C Schideman, Matthew Ong
Bioaugmentation in the acid-phase of a two-phase anaerobic membrane bioreactor (AnMBR) treating primary sludge was investigated as a means for targeting and improving hydrolysis and acetogenesis. Bioaugmentation was carried out using a proprietary bioculture blend containing a mixture of hydrolytic, acidogenic, and acetogenic microorganisms. This mixture was added on its own and in combination with recycled anaerobic sludge from the methane-phase of the AnMBR. Both bioaugmentation strategies had a positive effect on overall hydrolysis (25-38%), and acid-phase acetic acid generation (31-52%) compared to operation without bioaugmentation...
October 10, 2018: Environmental Technology
Recep Kaan Dereli, Frank P van der Zee, Izzet Ozturk, Jules B van Lier
Whey, produced in large quantities during cheese production, is a rapidly fermentable high strength wastewater characterized by a high biodegradability and low alkalinity. In this study, a lab-scale cross-flow anaerobic membrane bioreactor was used to address the commonly experienced difficulties such as unstable reactor performance and unexpected biomass losses when treating whey wastewater with conventional anaerobic reactors. The anaerobic membrane bioreactor provided a stable treatment performance, i.e...
September 18, 2018: Environmental Research
Antonina Kruglova, Anna Mikola, Alejandro Gonzalez-Martinez, Riku Vahala
The effect of antibiotics sulfadiazine and trimethoprim on activated sludge operated at 8°C was investigated. Performance and microbial communities of sequencing batch reactors (SBRs) and Membrane Bioreactors (MBRs) were compared before and after the exposure of antibiotics to the synthetic wastewater. The results revealed irreversible negative effect of these antibiotics in environmentally relevant concentrations on nitrifying microbial community of SBR activated sludge. In opposite, MBR sludge demonstrated fast adaptation and more stable performance during the antibiotics exposure...
October 7, 2018: Biotechnology Progress
Baolin Hou, Yu Kuang, Hongjun Han, Ye Liu, Bozhi Ren, Renjian Deng, Andrew S Hursthouse
A membrane electro-bioreactor (MEBR) embracing biological treatment, electrokinetic phenomena and membrane filtration was established by applying intermittent direct current (DC) to MBR. MEBR exhibited significant improvement of treatment performance and reduction of membrane fouling. COD and total phenols removal efficiencies increased to 83.53% and 93.28% at an exposure mode of 24'-OFF/6'-ON, compared to 71.24% and 82.43% in MBR. Trans-membrane pressure increment rate declined dramatically in MEBR, which was mainly attributed to the increase of sludge floc size and decrease of zeta potential, soluble microbial products and specific resistance to filtration, resulted from electrokinetic effects such as electrocoagulation, electrophoresis, electroosmosis and electromigration of ions...
September 13, 2018: Bioresource Technology
A Eliseus, M R Bilad, N A H M Nordin, Asim L Khan, Z A Putra, M D H Wirzal, Muhammad Aslam, A Aqsha, J Jaafar
Membrane fouling is a major challenge in membrane bioreactors (MBRs) and its effective handling is the key to improve their competitiveness. Tilting panel system offers significant improvements for fouling control but is strictly limited to one-sided panel. In this study, we assess a two-way switch tilting panel system that enables two-sided membranes and project its implications on performance and energy footprint. Results show that tilting a panel improves permeance by up to 20% to reach a plateau flux thanks to better contacts between air bubbles and the membrane surface to scour-off the foulant...
September 28, 2018: Journal of Environmental Management
Sri R Madabhushi, John Gavin, Sen Xu, Collette Cutler, Rebecca Chmielowski, William Rayfield, Nihal Tugcu, Hao Chen
Process mass intensity (PMI) is a benchmarking metric to evaluate the efficiency of a manufacturing process, which is indicative of the environmental impact of the process. Although this metric is commonly applied for small molecule manufacturing processes, it is less commonly applied to biologics. In this study, an Excel based tool developed by the ACS GCI Pharmaceutical Roundtable was used to calculate PMI of different manufacturing processes for a monoclonal antibody (mAb). For the upstream process, three different versions were compared: fed-batch, fed-batch with N-1 perfusion, and perfusion in the N-stage bioreactor...
September 29, 2018: Biotechnology Progress
Mohd Atiqueuzzaman Khan, Huu Hao Ngo, Wenshan Guo, Yiwen Liu, Long Duc Nghiem, Soon Woong Chang, Dinh Duc Nguyen, Shicheng Zhang, Gang Luo, Hui Jia
This study aims to investigate the production of volatile fatty acids (VFAs) from low strength wastewater at various hydraulic retention time (HRT) and organic loading rate (OLR) in a continuous anaerobic membrane bioreactor (AnMBR) using glucose as carbon source. This experiment was performed without any selective inhibition of methanogens and the reactor pH was maintained at 7.0 ± 0.1. 48, 24, 18, 12, 8 and 6 h-HRTs were applied and the highest VFA concentration was recorded at 8 h with an overall VFA yield of 48...
September 23, 2018: Bioresource Technology
James W Allen, Rahul Tevatia, Yaşar Demirel, Concetta C DiRusso, Paul N Black
Algae are often promoted as feedstock organisms to produce a sustainable petroleum fossil fuel alternative. However, to induce lipid accumulation most often requires a severe stress that is difficult to induce in large batch cultures. The objective of this study is to analyze and mathematically model heat stress on growth, chlorophyll content, triacylglyceride, and starch synthesis in algae. We initially screened 30 algal species for the most pronounced induction of lipid droplets from heat stress using confocal microscopy and mass spectroscopy techniques...
2018: PloS One
Debarati Mukherjee, Ashmita Dewanjee, Sourja Ghosh, Swachchha Majumdar
Graphene oxide (GO)-based composite ultrafiltration (UF) membranes were prepared on macroporous ceramic support tubes following a new way. Chitosan was used as an intermediate matrix between the substrate and GO coating. It has hydroxyl and amine groups, which enhances its film forming capacity with hydrophilic GO. This led us to use them as precursors for membrane development. Process efficiency of the prepared UF membrane was assessed in terms of the removal of toxic pesticide atrazine in side-stream membrane bioreactor (MBR) processes...
September 26, 2018: Environmental Science and Pollution Research International
Muhammad B Asif, Ashley J Ansari, Shiao-Shing Chen, Long D Nghiem, William E Price, Faisal I Hai
High retention membrane bioreactors (HR-MBR) combine a high retention membrane separation process such as membrane distillation, forward osmosis, or nanofiltration with a conventional activated sludge (CAS) process. Depending on the physicochemical properties of the trace organic contaminants (TrOCs) as well as the selected high retention membrane process, HR-MBR can achieve effective removal (80-99%) of a broad spectrum of TrOCs. An in-depth assessment of the available literature on HR-MBR performance suggests that compared to CAS and conventional MBRs (using micro- or ultra-filtration membrane), aqueous phase removal of TrOCs in HR-MBR is significantly better...
September 27, 2018: Environmental Science and Pollution Research International
Ángel Robles, Maria Victoria Ruano, Amine Charfi, Geoffroy Lesage, Marc Heran, Jérôme Harmand, Aurora Seco, Jean-Philippe Steyer, Damien J Batstone, Jeonghwan Kim, José Ferrer
The use of anaerobic membrane bioreactor technology (AnMBR) is rapidly expanding. However, depending on the application, AnMBR design and operation is not fully mature, and needs further research to optimize process efficiency and enhance applicability. This paper reviews state-of-the-art of AnMBR focusing on modelling and control aspects. Quantitative environmental and economic evaluation has demonstrated substantial advantages in application of AnMBR to domestic wastewater treatment, but detailed modelling is less mature...
September 12, 2018: Bioresource Technology
Stephen M Long, Hao L Tang
A membrane bioreactor (MBR) acclimatized with wastewater organic matter was employed for surface water treatment, and the feasibility of the MBR for the removal of disinfection by-product (DBP) precursors was studied. With a low pressure microfiltration hollow-fiber membrane module, a hydraulic retention time of 1.5 hours and a solids retention time of 180 days, the MBR was able to achieve 35% removal of trichloroacetic acid precursors and 21% removal of dichloroacetic acid precursors. The removal of trichloromethane (TCM) and brominated DBP precursors was unsatisfactory...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
M Sabaghian, M R Mehrnia, M Esmaieli, D Noormohammadi
This study introduces a self-forming dynamic membrane (SFDM) with large-pore mesh filter materials instead of conventional MF/UF membranes for wastewater treatment. Development of SFDM on the mesh filter surface plays a major role in reducing the wastewater turbidity and its performance in a self-formation dynamic membrane bioreactor (SFDMBR). To evaluate formation of the dynamic membrane, biological and hydrodynamic parameters, including mixed liquor suspended solids (MLSS) and aeration rate, were examined...
September 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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