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Membrane Bioreactor

Nouha Bakaraki Turan, Dotse Selali Chormey, Hanife Sari Erkan, Abdulkadir Cağlak, Merve Saral, Sezgin Bakirdere, Guleda Onkal Engin
Membrane bioreactors (MBRs) are rapidly developing systems widely used for the treatment of municipal and industrial wastewater prior to their discharge into the environment. Membrane fouling is the most important challenge in MBRs, because it negatively affects membrane performance, resulting in low permeate flux, higher trans-membrane pressure and frequent membrane cleaning/replacement. In this study, the effect of tea and coffee on sludge characteristics, membrane fouling and the bacterial signaling molecule N-butyryl-L-homoserine lactone (C4-HSL) in a membrane bioreactor system were investigated...
December 4, 2018: Environmental Technology
Xiaoling Su, Penchi Chiang, Shuyuan Pan, Guangjiao Chen, Yinren Tao, Gaojie Wu, Feifei Wang, Wenzhi Cao
Evaluating the performance of wastewater treatment represents a challenging and complex task as it usually involves engineering, environmental and economic (3E) factors. In this study, we developed an 3E triangle model to evaluate the performance of environmental technologies (i.e., anaerobic-anoxic-oxic reactors, oxidation ditches, and membrane bioreactors) and ecological technologies (i.e., stabilization ponds, constructed wetlands, and slow-rate systems) for wastewater treatment. A total of 17 key performance indicators, such as energy consumption, pollutant removal, global warming potential and wastewater treatment fees, were considered in the 3E triangle model...
November 17, 2018: Chemosphere
Bing Wu
Greywater reclamation has been well recognized as an alternative water resource for non-potable or potable use. To meet greywater reuse standards, various membrane-based techniques have been widely adopted to treat greywater for producing water with superior quality. This paper aims to present a comprehensive review on membrane-based techniques in greywater treatment, including direct pressure-driven and osmotic-driven membrane processes, hybrid membrane processes (such as membrane bioreactors and integrating membrane separation with other processes), and resource recovery oriented membrane-based processes...
November 26, 2018: Science of the Total Environment
Katsuki Kimura, Hiroki Uchida
Intensive membrane cleaning can be used with ceramic membranes since they are physically/chemically robust. It might therefore be possible for membrane bioreactors (MBRs) to be operated under the condition of a high membrane flux when ceramic membranes are used with such intensive membrane cleaning. In this study, bench-scale MBRs equipped with flat-sheet ceramic membranes were operated for long periods. Circulation of granular materials (cylindrical polyurethane) in the tank and frequent chemically enhanced backwash (CEB) were used as intensive physical cleaning and chemical cleaning in this study, respectively...
November 14, 2018: Water Research
Rong Chen, Wen Wen, Hongyu Jiang, Zhen Lei, Mingzhe Li, Yu-You Li
A large amount of wastewater is generated in the processing of coffee from fruit to cup. Thermophilic high-solids co-digestion of coffee processing wastewater (CPW) and waste activated sludge (WAS) has been succeeded by anaerobic membrane bioreactor (AnMBR). Chemical oxygen demand (COD) removal efficiencies of 92 ± 3% with an average methane yield of 0.28 LCH4 /gCODremoved were achieved at a high solids content of 50 g/L in the AnMBR. The optimal digestion performance of 82.4% removal COD conversion to CH4 was achieved at hydraulic retention time (HRT) 10 d...
November 23, 2018: Bioresource Technology
Chuanyi Zhang, Yunkun Qian, Limei Yuan, Shilong He, Ying Wang, Liping Wang
An alternate anaerobic/anoxic-aerobic double membrane bioreactors process (A2 N-DMBR) was proposed to improve denitrifying phosphorus removal efficiency. The system was operated for 70 d under different nitrogen/phosphorus (N/P) ratios with synthetic wastewater to present the performance evaluation of nutrients removal and microbial community structure in the A2 N-DMBR process. The results showed that when the influent total phosphorus (TP) was 6.4 mg/L, the corresponding N/P ratio of 8.8, the high removal capacity of nitrogen and phosphorus could be achieved with the average effluent TP and total nitrogen (TN) concentration of 0...
November 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Lingwei Gao, Daisuke Minakata, Zongsu Wei, Richard Spinney, Dionysios D Dionysiou, Chong-Jian Tang, Liyuan Chai, Ruiyang Xiao
The role of soluble microbial products (SMP), the most important component of effluent organic matter (EfOM) from municipal wastewater treatment plants, in sulfate radical SO4 •- ‒based advanced oxidation technologies (AOTs) remains substantially unclear. In this study, we first utilized a suite of macro and micro analytical techniques to characterize the SMP from a membrane bioreactor for its fundamental molecular, spectroscopic, and reactivity properties. The degradation kinetics of three representative pharmaceuticals (i...
November 30, 2018: Environmental Science & Technology
Zehua Li, Qinghua Zhang, Qinrui Jiang, Guoqiang Zhan, Daping Li
To address the issue of insufficient electrons during denitrification, an iron fuel cell (IFC) bioreactor using iron as abiotic anode was designed. The nitrogen removal efficiency (NRE) of IFC (2.54 ± 0.016%) was significantly lower than microbial fuel cell (MFC) (32.58 ± 0.033%) with same bio-cathode under autotrophic conditions, which was due to the permeation of acetate on proton exchange membrane (PEM) affected the process of enriching autotrophic denitrifying bacteria by MFC. When used in heterotrophic conditions, the NRE of the closed-circuits of IFC was 29...
November 20, 2018: Bioresource Technology
Shun Wang, Cong Ma, Chao Pang, Zhenhu Hu, Wei Wang
Although anaerobic membrane bioreactor (AnMBR) has been proposed for the treatment of phenolic wastewater, the membrane fouling is still a major obstacle. The effects of dosing of granular activated carbon (GAC) and polyaluminum chloride (PACl) on the treatment performance and membrane fouling of anaerobic ceramic membrane bioreactor were investigated for treating phenol- and quinoline-containing wastewater. The results suggested that the one-off dosing of GAC resulted in a decrease of protein/carbohydrate ratio, which might account for the aggravation of membrane fouling alongside with the decreased flocs size...
November 27, 2018: Environmental Science and Pollution Research International
Gan Luo, Zhu Wang, Yan Li, Jun Li, Ai-Min Li
Start-up of membrane bioreactor under different NaCl stress was investigated in this study. Results showed that nearly 90% chemical oxygen demands and ammonia nitrogen ([Formula: see text]-N) was oxidized in none and 0.5% NaCl condition during the start-up stage. While 1% NaCl dramatically depressed the utilization of [Formula: see text]-N and about 4 weeks were required for adaption of sludge biomass to saline condition. In addition, the accumulation of nitrite high to 11.84 mg/L was observed in 1% NaCl stress, indicating the more inhibition on the activity of nitrite oxidizing bacteria...
November 26, 2018: Bioprocess and Biosystems Engineering
Thanh-Tin Nguyen, Xuan-Thanh Bui, Bao-Trong Dang, Huu-Hao Ngo, Deokjin Jahng, Takahiro Fujioka, Shiao-Shing Chen, Quoc-Tuc Dinh, Cong-Nguyen Nguyen, Phan-Thai-Vy Nguyen
This study aimed to evaluate treatment performance and membrane fouling of a lab-scale Sponge-MBR under the added ciprofloxacin (CIP) dosages (20; 50; 100 and 200 µg L-1 ) treating hospital wastewater. The results showed that Sponge-MBR exhibited effective removal of COD (94-98%) during the operation period despite increment of CIP concentrations from 20 to 200 µg L-1 . The applied CIP dosage of 200 µg L-1 caused an inhibition of microorganisms in sponges, i.e. significant reduction of the attached biomass and a decrease in the size of suspended flocs...
November 16, 2018: Bioresource Technology
Lijie Zhou, Biao Ye, Siqing Xia
Chromate (CrO4 2- ) exposure, especially high concentration (mg/L), still probably occurs in the industrial and mining area due to industrial accidents or even illegal discharge, though CrO4 2- has been restricted to be discharged into wastewater treatment system (WWTS). Therefore, this study was applied to better understand the structural characteristics of cake layer in membrane bioreactor (MBR), which is one of best alternative for WWTS of industrial or mining area, with CrO4 2- exposure. Three submerged MBRs with CrO4 2- exposure (10 mg/L was normal high concentration CrO4 2- ; 50 mg/L as extreme level for better identification; 0 mg/L as control condition) were applied in this study...
November 23, 2018: Ecotoxicology and Environmental Safety
Jiaheng Teng, Meijia Zhang, Kam-Tin Leung, Jianrong Chen, Huachang Hong, Hongjun Lin, Bao-Qiang Liao
Soluble microbial products (SMPs) are the predominate foulants determining fouling extent in membrane bioreactors (MBRs). However, exact mechanism underlying their typical fouling behaviors remains unrevealed. In this study, the typical fouling behaviors of SMPs during initial operational period of a MBR were characterized. It was found that, although being low content, SMPs rather than sludge particulates preferentially adhered to membrane surface to accumulate a gel layer, and moreover, specific filtration resistance (SFR) of SMPs was approximately 700 times larger than that of the sludge particulates at operational day 3...
November 19, 2018: Water Research
Daniel von Bornstädt, Hanjay Wang, Michael J Paulsen, Andrew B Goldstone, Anahita Eskandari, Akshara Thakore, Lyndsay Stapleton, Amanda N Steele, Vi N Truong, Kevin Jaatinen, Camille Hironaka, Y Joseph Woo
BACKGROUND: Cardiovascular bypass grafting is an essential treatment for complex cases of atherosclerotic disease. Because the availability of autologous arterial and venous conduits is patient-limited, self-assembled cell-only grafts have been developed to serve as functional conduits with off-the-shelf availability. The unacceptably long production time required to generate these conduits, however, currently limits their clinical utility. Here, we introduce a novel technique to significantly accelerate the production process of self-assembled engineered vascular conduits...
November 6, 2018: Circulation
Zhenzhen Yu, Yisong Hu, Mawuli Dzakpasu, Xiaochang C Wang, Huu Hao Ngo
The effects of powdered activated carbon (PAC) addition on sludge morphological, aggregative and microbial properties in a dynamic membrane bioreactor (DMBR) were investigated to explore the enhancement mechanism of pollutants removal and filtration performance. Sludge properties were analyzed through various analytical measurements. The results showed that the improved sludge aggregation ability and the evolution of microbial communities affected sludge morphology in PAC-DMBR, as evidenced by the formation of large, regularly shaped and strengthened sludge flocs...
January 2019: Journal of Environmental Sciences (China)
Jessa Marie J Millanar-Marfa, Laura Borea, Mark Daniel G de Luna, Florencio C Ballesteros, Vincenzo Belgiorno, Vincenzo Naddeo
High operational cost due to membrane fouling propensity remains a major drawback for the widespread application of membrane bioreactor (MBR) technology. As a result, studies on membrane fouling mitigation through the application of integrated processes have been widely explored. In this work, the combined application of electrochemical processes and moving bed biofilm reactor (MBBR) technology within an MBR at laboratory scale was performed by applying an intermittent voltage of 3 V/cm to a reactor filled with 30% carriers...
November 22, 2018: Membranes
Thi-Kim-Quyen Vo, Jeong-Jun Lee, Joon-Seok Kang, Seogyeong Park, Han-Seung Kim
Sulfur-based carriers were examined to enhance the nitrogen removal efficiency in a mixed anoxic⁻anaerobic-membrane bioreactor system, in which sulfur from the carrier acts as an electron donor for the conversion of nitrate to nitrogen gas through the autotrophic denitrification process. A total nitrogen removal efficiency of 63% was observed in the system with carriers, which showed an increase in the removal efficiency of around 20%, compared to the system without carriers. The results also indicated that the carriers had no adverse effect on biological treatment for the organic matter and total phosphorus...
November 22, 2018: Membranes
Guangpeng Chen, Liying Bin, Bing Tang, Shaosong Huang, Ping Li, Fenglian Fu, Luying Wu, Zhiwen Yang
The investigation aimed at revealing the influence of an external disturbance on the rapid reformation of larger aerobic granular sludge (AGS) in an internal-circulation membrane bioreactor (IC-MBR) after long-term operation. The used IC-MBR was continuously operated well for more than one year, in which, the biomass was still in the state of AGS with a balanced average size at around 200 μm and an even size distribution. By providing short-time aeration to the biomass within this bioreactor, the characteristics of biomass were totally changed in a very short time, including the surface hydrophilicity, physic-chemical properties, and the structure of microbial community, which created suitable conditions for the growth of filamentous bacteria (Saccharibacteria)...
November 9, 2018: Bioresource Technology
Alberto Tenore, João Vieira, Luigi Frunzo, Vincenzo Luongo, Massimiliano Fabbricino
A mathematical model to simulate the biological processes occurring in a membrane bioreactor (MBR) is presented. The model accounts for different MBR technical features by introducing specific permeability parameters for the applied membrane system. The model accounts for the heterotrophic storage process and the formation of soluble microbial products. The introduction of an inhibition coefficient influencing the anoxic kinetics enables the model to simulate the particular operating conditions of the plant, such as a high or low dissolved oxygen concentration in the denitrification tank...
November 23, 2018: Environmental Technology
Marina Wierz, Sandrine Pierson, Ernesto Gargiulo, Coralie Guerin, Etienne Moussay, Jerome Paggetti
Exosomes are membrane-enclosed vesicles released by different cell types into the extracellular space. As mediators of intercellular communication, they are involved in multiple physiological processes, but they are also associated with the pathogenesis of human malignancies including leukemia. Isolation of exosomes enables the characterization of their role in microenvironment modulation as well as their participation in disease pathology. A variety of strategies and techniques exists to purify exosomes from many biological fluids (e...
2019: Methods in Molecular Biology
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