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Membrane Bioreactor

J González-Camejo, R Barat, M V Ruano, A Seco, J Ferrer
As microalgae have the ability to simultaneously remove nutrients from wastewater streams while producing valuable biomass, microalgae-based wastewater treatment is a win-win strategy. Although recent advances have been made in this field in lab conditions, the transition to outdoor conditions on an industrial scale must be further investigated. In this work an outdoor pilot-scale membrane photobioreactor plant was operated for tertiary sewage treatment. The effects of different parameters on microalgae performance were studied including: temperature, light irradiance (solar and artificial irradiance), hydraulic retention time (HRT), biomass retention time (BRT), air sparging system and influent nutrient concentration...
August 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Bahar Yavuztürk Gül, Derya Yüksel Imer, Pyung-Kyu Park, Ismail Koyuncu
This study aimed to address the gap in understanding how the microbial community present within quorum quenching-membrane bioreactor (QQ-MBRs) changes during the operations by investigating the behavior of two different types of QQ bacteria, Bacillus sp. T5 and Delftia sp. T6. The anti-biofouling effects of T5 and T6 in the QQ-MBR were 85% and 76%, respectively. According to the Illumina HiSeq results, when the QQ-MBR was operated with Gram-positive bacteria, T5, in the mixed liquor a reduction was observed in Gram-positive bacteria and Gram-negative bacteria population increased...
August 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Danièle Mousel, Johannes Pinnekamp
Nursing home (NH) wastewater was pretreated in an ultrafiltration membrane bioreactor (MBR) and subsequently ozonated in a pilot plant in order to evaluate the elimination of pharmaceutically active compounds (PhACs). Dosing of the pre-treated wastewater with 5 mg ozone (O3 ) L-1 led to the elimination of >50% for nearly all investigated PhACs in the ozonation plant, whereas dosing 10 mg O3 L-1 increased elimination to >80%. A total hydraulic retention time of 12.8 min proved sufficient for PhAC elimination...
August 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Peng Wu, Ya Chen, Xiaoming Ji, Wenru Liu, Gang Lv, Yaoliang Shen, Qi Zhou
Three innovative reactors (CAMBR) through optimally combining with the Anaerobic Baffled reactor and Membrane bioreactor were applied to start up the cold-anammox process at low temperature (13 °C) through inoculating flocculent nitrification sludge (R1), anaerobic granular sludge (R2) and flocculent denitrification sludge (R3), respectively. Results showed that anammox process was started successfully with over 90% total nitrogen removal rate in R1, R2 and R3 after 75d, 45d, and 90d, respectively. Microbial community revealed that Ca...
July 8, 2018: Bioresource Technology
Dongle Cheng, Huu Hao Ngo, Wenshan Guo, Yiwen Liu, Soon Woong Chang, Dinh Duc Nguyen, Long Duc Nghiem, Junliang Zhou, Bingjie Ni
Antibiotic wastewater has become a major concern due to the toxicity and recalcitrance of antibiotics. Anaerobic membrane bioreactors (AnMBRs) are considered alternative technology for treating antibiotic wastewater because of their advantages over the conventional anaerobic processes and aerobic MBRs. However, membrane fouling remains the most challenging issue in the AnMBRs' operation and this limits their application. This review critically discusses: (i) antibiotics removal and antibiotic resistance genes (ARGs) in different types of AnMBRs and the impact of antibiotics on membrane fouling and (ii) the integrated AnMBRs systems for fouling control and removal of antibiotics...
July 31, 2018: Bioresource Technology
Flaka Radoniqi, Hu Zhang, Cameron L Bardliving, Parviz Shamlou, Jon Coffman
Alternating tangential flow (ATF) filtration has been successfully adopted as a low shear cell separation device in many perfusion-based processes. The reverse flow per cycle is used to minimize fouling compared to tangential flow filtration (TFF). Currently, modeling of the ATF system is based on empirically derived formulas, leading to oversimplification of model parameters. In this study, an experimentally validated porous CFD model was used to predict localized fluid behavior and pressure profiles in the ATF membrane for both water and supernatant solutions...
August 6, 2018: Biotechnology and Bioengineering
Pompilio Vergine, Carlo Salerno, Giovanni Berardi, Alfieri Pollice
Two lab-scale Self Forming Dynamic Membrane BioReactors (SFD-MBR), equipped with 50 µm nylon meshes were set up and operated for the treatment of real municipal wastewater. Plastic carriers were added in one of the two bioreactors to generate a combination of the Integrated Fixed-film Activated Sludge (IFAS) and the SFD-MBR technologies. Overall, the two systems performed very well, achieving excellent effluent quality under steady state conditions and showing good resilience to extreme organic loading conditions...
July 25, 2018: Bioresource Technology
Giorgio Mannina, Alida Cosenza, George Ekama
This paper compares two mathematical models (Model I and Model II) to predict greenhouse gases emission from a University Cape Town (UCT) - membrane bioreactor (MBR) plant. Model I considers N2 O production only during denitrification. Model II takes into account the ammonia-oxidizing bacteria (AOB) formation pathways for N2 O. Both models were calibrated adopting real data. Model comparison was performed in terms of (i) sensitivity analysis (ii) best fit and (iii) model prediction uncertainty. On average 6% of factors of Model I and 9% of Model II resulted to be important...
July 21, 2018: Bioresource Technology
Tonny Kurniawan, Ilma Hanifah, Rachma Wikandari, Ria Millati, Mohammad J Taherzadeh, Claes Niklasson
The presence of an antimicrobial compound called D-Limonene in citrus waste inhibits methane production from such waste in anaerobic digestion. In this work, a two-stage anaerobic digestion method is developed using reverse membrane bioreactors (rMBRs) containing cells encased in hydrophilic membranes. The purpose of encasement is to retain a high cell concentration inside the bioreactor. The effectiveness of rMBRs in reducing cell washout is evaluated. Three different system configurations, comprising rMBRs, freely suspended cells (FCs), and a combination of both (abbreviated to rMBR⁻FCs), are incubated at three different organic loading rates (OLRs) each, namely 0...
August 2, 2018: Materials
Ester Coppini, Laura Palli, Donatella Fibbi, Riccardo Gori
This paper presents a case study describing a full-scale membrane bioreactor (MBR) for the pretreatment of landfill leachates. The treatment train includes an aerated equalization tank, a denitrification tank, an oxidation/nitrification tank, and two ultrafiltration units. The plant has worked continuously since 2008 treating landfill leachates at a flux of 2⁻11 L·h-1 ·m-2 . The old train of membranes worked in these conditions for more than seven years prior to being damaged and replaced. The permeability (K) of the membrane varied between 30 and 80 L·h-1 ·m-2 ·bar-1 during the years of operation...
August 1, 2018: Membranes
Nazely Diban, Beatriz Gómez-Ruiz, María Lázaro-Díez, Jose Ramos-Vivas, Inmaculada Ortiz, Ane Urtiaga
High porosity and mass transport properties of microfiltration polymeric membranes benefit nutrients supply to cells when used as scaffolds in interstitial perfusion bioreactors for tissue engineering. High nutrients transport is assumed when pore size and porosity of the membrane are in the micrometric range. The present work demonstrates that the study of membrane fouling by proteins present in the culture medium, though not done usually, should be included in the routine testing of new polymer membranes for this intended application...
August 1, 2018: Membranes
T Miyoshi, T Tsumuraya, T P Nguyen, K Kimura, Y Watanabe
In this study, we investigated the effects of recirculation and separation times on removals of organic matter, nitrogen, and phosphorus in a baffled membrane bioreactor (B-MBR) treating real municipal wastewater. A pilot-scale B-MBR experimental apparatus was operated under two different sets of recirculation and separation times. The results revealed that, irrespective of operating conditions, the biochemical oxygen demand (BOD) and concentration of total nitrogen (T-N) in the treated water can be lowered to less than 3 and 5 mg/L, respectively...
July 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Alexander Mayer, Torben Schädler, Sascha Trunz, Thomas Stelzer, Dirk Weuster-Botz
Carbon monoxide concentrations in syngas are often high but tolerance towards CO varies a lot between homoacetogenic bacteria. Analysis of the autotrophic potential revealed that the first isolated acetogenic bacterium Clostridium aceticum was able to use CO as sole carbon and energy source for chemolithoautotrophic carbon fixation but simultaneously showed little tolerance to high CO concentrations. Not yet reported autotrophic ethanol production by C. aceticum was discovered with CO as substrate in batch processes Growth rates estimated in batch processes at varying CO partial pressures were used to identify the CO inhibition kinetics of C...
July 31, 2018: Biotechnology and Bioengineering
Yuya Takimoto, Masashi Hatamoto, Takaya Ishida, Takahiro Watari, Takashi Yamaguchi
Membrane fouling in membrane bioreactors (MBR) remains a major issue and knowledge of microbes associated with biofilm formation might facilitate the control of this phenomenon, Thus, an anoxic/oxic membrane bioreactor (A/O-MBR) was operated under an extremely low organic loading rate (0.002 kg-COD·m-3 ·day-1 ) to induce membrane fouling and the major biofilm-forming bacteria were identified. After operation under extremely low organic loading condition, the reactor showed accumulation of total nitrogen and phosphorus along with biofilm development on the membrane surface...
July 30, 2018: Scientific Reports
Yiming Jiang, Aman Khan, Haiying Huang, Yanrong Tian, Xuan Yu, Qiang Xu, Lichao Mou, Jianguo Lv, Pengyun Zhang, Pu Liu, Li Deng, Xiangkai Li
Petroleum refinery wastewater (PRW) treatments based on biofilm membrane bioreactor (BF-MBR) technology is an ideal approach and biofilm supporting material is a critical factor. In this study, BF-MBR with nano-attapulgite clay compounded hydrophilic urethane foams (AT/HUFs) as a biofilm support was used to treat PRW with a hydraulic retention time of 5 h. The removal rate of 500 mg/L chemical oxygen demand (COD), 15 mg/L NH4 + and 180 NTU of turbidity were 99.73%, 97.48% and 99.99%, which were 23%, 20%, and 6% higher than in the control bioreactor, respectively...
July 27, 2018: Science of the Total Environment
Cheng Hou, Jinyou Shen, Xinbai Jiang, Dejin Zhang, Xiuyun Sun, Jiansheng Li, Weiqing Han, Xiaodong Liu, Lianjun Wang
Enhanced biodegradation of high-strength pyridine was successfully achieved in the inner loop anoxic/oxic-dynamic membrane bioreactor (A/O-DMBR) in this study. Due to the key role of dynamic membrane in biomass retention, NH4 + released from pyridine biodegradation could be effectively nitrified to NO3 - in oxic zone, which was then recirculated into the anoxic zone to serve as electron acceptor for pyridine biodegradation. Acetate dosage adversely affected pyridine biodegradation, due to the competitive effect of acetate towards NO3 - ...
July 21, 2018: Bioresource Technology
Tatiana Prado, Antônio de Castro Bruni, Mikaela Renata Funada Barbosa, Suzi Cristina Garcia, Luisa Zanolli Moreno, Maria Inês Zanoli Sato
The importance of noroviruses (NoVs) in the epidemiology of waterborne diseases has increased globally in the last decades. The present study aimed to monitor genogroup I and II noroviruses in different treatment stages of four wastewater treatment plants (WWTPs) in the metropolitan São Paulo. WWTPs consist of secondary (activated sludge) and tertiary treatments (coagulation, sand-anthracite filters, membrane bioreactor (MBR)/reverse osmosis (RO) and chlorination). Raw sewage (500mL) and treated effluents (1L) were concentrated by celite and reclaimed water (40L) by hollow-fiber ultrafiltration system...
July 23, 2018: Science of the Total Environment
Haifeng Lu, Meng Peng, Guangming Zhang, Baoming Li, Yuanyuan Li
Photosynthetic bacteria (PSB) are considered ideal for high COD wastewater treatment and resource recovery. This work is the first continuous-mode long-term (440 days) pilot study (240 L) by using PSB-membrane (PSB-MBR) system for such purpose. Results showed that the system started-up in 27 days for brewery wastewater and then stably operated under various temperature, initial COD and pH conditions, which showed fast start-up and strong robustness. Comparing with small-batch PSB-MBR system, the capacity of pollutants treatment degradation rate in the pilot-continuous PSB-MBR system was promoted...
July 20, 2018: Science of the Total Environment
Xiang Cai, Genying Yu, Huachang Hong, Yiming He, Liguo Shen, Hongjun Lin
Impacts of morphologies of both membrane and foulant on interaction energies related with adhesive fouling in a membrane bioreactor (MBR) were explored by thermodynamic analyses. Interaction energies in three possible interaction scenarios regarding different membrane and foulant morphologies under conditions in this study were quantified according to the thermodynamic methods. It was interestingly found that, strength of total interaction between soluble microbial products (SMPs) and rough membrane was over 20,000 times of that between sludge flocs and rough membrane under same conditions, indicating the extremely higher adhesion ability of SMPs than the large particulate foulants...
July 10, 2018: Journal of Colloid and Interface Science
Zhuotong Zeng, Bi Tang, Rong Xiao, Jinhui Huang, Yanling Gu, Yahui Shi, Yi Hu, Jianxin Zhou, Hua Li, Lixiu Shi, Guangming Zeng
In order to improve the antifouling properties of quorum quenching (QQ) bacteria immobilized beads, the mechanical strength and permeability of QQ beads were modified by adding powdered activated carbon (PAC) based on traditional polyvinyl alcohol (PVA)-boric acid method. Optimal PAC concentration was investigated through measuring the mechanical strength, permeability and N-octanoyl-DLhomoserine lactone (C8-HSL) removal ratio of the PAC-PVA beads. Particularly, the enhanced antifouling effects of the optimal PAC-PVA beads were compared with those of original QQ beads through a membrane filtration experiment under constant pressure...
October 2018: Enzyme and Microbial Technology
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