Anaerobic membrane bioreactor for treatment of synthetic municipal wastewater at ambient temperature

2007 ◽  
Vol 55 (7) ◽  
pp. 79-86 ◽  
Author(s):  
J.H. Ho ◽  
S.K. Khanal ◽  
S. Sung
Keyword(s):  
Composite Membrane ◽  
Membrane Bioreactor ◽  
Membrane Surface ◽  
Membrane System ◽  
Woven Fabric ◽  
Anaerobic Membrane Bioreactor ◽  
Fabric Filter ◽  
Ptfe Composite ◽  
Cake Layer ◽  
Sludge Cake

Non-woven fabric filter and poly-tetrafluoroethylene (PTFE) composite membrane were investigated to determine their applicability to treat low strength wastewater in an anaerobic membrane bioreactor (AMBR). Sludge cake resistance of the membrane was quantified using pure water flux of anaerobic sludge cake accumulated on the glass fiber filter of similar pore size. It is hypothesized that the formation of thin cake layer on the porous medium, e.g. non-woven and PTFE acts as a dynamic membrane. Thus, the capture of thin sludge cake inside the non-woven fabric matrix and accumulation on the PTFE membrane surface forms a membrane system equivalent to a commercial membrane system. The permeate quality was found to improve as the cake became more dense with filtration time. The PTFE composite membrane coated with thin PTFE film on the non-woven fabric filter enhanced the filtration performance by improving flux and minimizing the propensity of bio-fouling. The membrane flux was restored by back-flushing with permeate. The AMBR coupled with PTFE laminated membrane was operated continuously during the experiment at a cross flow velocity (CFV) of 0.1–0.2 m/sec and a transmembrane pressure (TMP) of 0.5–3 psi. Although about a month of acclimation was required to reach steady state, the effluent chemical oxygen demand (COD), volatile fatty acids (VFAs) as acetic acid, and suspended solids (SS) concentrations were below 30, 20 and 10 mg/L, respectively, during 90 days of operation with intermittent back washing. The lower operation TMP and CFV were subjected to less shear stress on the microbial community during continuous AMBR operation. In addition, thin sludge film accumulated on the membrane surface also acted as a biofilm bioreactor to remove additional COD in this study

Exerting ultrasound to control the membrane fouling in filtration of anaerobic activated sludge—mechanism and membrane damage

2008 ◽  
Vol 57 (5) ◽  
pp. 773-779 ◽  
Author(s):  
Xianghua Wen ◽  
Pengzhe Sui ◽  
Xia Huang
Keyword(s):  
Activated Sludge ◽  
Hydroxyl Radicals ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Chemical Interaction ◽  
Membrane Surface ◽  
Membrane Damage ◽  
Operational Conditions ◽  
Fouling Control ◽  
Cake Layer

In this study, ultrasound was applied to control membrane fouling development online in an anaerobic membrane bioreactor (AMBR). Experimental results showed that membrane fouling could be controlled effectively by ultrasound although membrane damage may occur under some operational conditions. Based upon the observation on the damaged membrane surface via SEM, two mechanisms causing membrane damage by exerting ultrasound are inferred as micro particle collide on the membrane surface and chemical interaction between membrane materials and hydroxyl radicals produced by acoustic cavitations. Not only membrane damage but also membrane fouling control and membrane fouling cleaning were resulted from these mechanisms. Properly selecting ultrasonic intensity and working time, and keeping a certain thickness of cake layer on membrane surface could be effective ways to protect membrane against damage.

Structure of cake layer in a submerged anaerobic membrane bioreactor

2011 ◽  
Vol 374 (1-2) ◽  
pp. 110-120 ◽  
Author(s):  
W.J. Gao ◽  
H.J. Lin ◽  
K.T. Leung ◽  
H. Schraft ◽  
B.Q. Liao
Keyword(s):  
Membrane Bioreactor ◽  
Anaerobic Membrane Bioreactor ◽  
Cake Layer

Optimization of reverse osmosis operational conditions to maximize ammonia removal from the effluent of an anaerobic membrane bioreactor

2021 ◽  
Vol 7 (4) ◽  
pp. 739-747
Author(s):  
Chungheon Shin ◽  
Aleksandra Szczuka ◽  
Renjing Jiang ◽  
William A. Mitch ◽  
Craig S. Criddle
Keyword(s):  
Reverse Osmosis ◽  
Membrane Bioreactor ◽  
Membrane Surface ◽  
Ammonia Removal ◽  
Clean Water ◽  
Operational Conditions ◽  
Anaerobic Membrane Bioreactor ◽  
Total Ammonia ◽  
Operational Factor ◽  
Membrane Surface Charge

RO enables the recovery of clean water and ammonium in anaerobic membrane bioreactor effluent. pH governs the ammonia speciation and membrane surface charge and is the key operational factor that affects the total ammonia rejection efficiency of RO.

scholarly journals New Insights into the Microbial Diversity of Cake Layer in Yttria Composite Ceramic Tubular Membrane in an Anaerobic Membrane Bioreactor (AnMBR)

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 108
Author(s):  
Rathmalgodage Thejani Nilusha ◽  
Yuansong Wei
Keyword(s):  
Membrane Bioreactor ◽  
Pcr Amplification ◽  
Domestic Wastewater ◽  
Composite Ceramic ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Anaerobic Sludge ◽  
Anaerobic Membrane Bioreactor ◽  
Tubular Membrane ◽  
Cake Layer

Cake layer formation is an inevitable challenge in membrane bioreactor (MBR) operation. The investigations on the cake layer microbial community are essential to control biofouling. This work studied the bacterial and archaeal communities in the cake layer, the anaerobic sludge, and the membrane cleaning solutions of anaerobic membrane bioreactor (AnMBR) with yttria-based ceramic tubular membrane by polymerase chain reaction (PCR) amplification of 16S rRNA genes. The cake layer resistance was 69% of the total membrane resistance. Proteins and soluble microbial by-products (SMPs) were the dominant foulants in the cake layer. The pioneering archaeal and bacteria in the cake layer were mostly similar to those in the anaerobic bulk sludge. The dominant biofouling bacteria were Proteobacteria, Bacteroidetes, Firmicutes, and Chloroflexi and the dominant archaeal were Methanosaetacea and Methanobacteriacea at family level. This finding may help to develop antifouling membranes for AnMBR treating domestic wastewater.

Fouling mitigation in an anaerobic membrane bioreactor via membrane surface modification with tannic acid and copper

2021 ◽  
pp. 118205
Author(s):  
Punika Maneewan ◽  
Warayuth Sajomsang ◽  
Sudkanueng Singto ◽  
Jenyuk Lohwacharin ◽  
Benjaporn Boonchayaanant Suwannasilp
Keyword(s):  
Surface Modification ◽  
Tannic Acid ◽  
Membrane Bioreactor ◽  
Membrane Surface ◽  
Anaerobic Membrane Bioreactor ◽  
Fouling Mitigation

Permeability decline in nanofiltration/reverse osmosis membranes fed with municipal wastewater treated by a membrane bioreactor

2013 ◽  
Vol 67 (9) ◽  
pp. 1994-1999 ◽  
Author(s):  
Katsuki Kimura ◽  
Naoko Ogawa ◽  
Yoshimasa Watanabe
Keyword(s):  
Organic Matter ◽  
Reverse Osmosis ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Membrane Surface ◽  
Chemical Cleaning ◽  
Filtration Resistance ◽  
Cake Layer ◽  
Total Filtration ◽  
Ro Membrane

Decline in the permeability in nanofiltration (NF)/reverse osmosis (RO) membranes that filtered effluents from a membrane bioreactor (MBR) treating municipal wastewater was investigated in this study. Four different 2-inch spiral-wound NF/RO membrane elements were continuously operated for 40 days. The results showed that the amount of deposits on the membrane surface did not affect the degree of permeability decline. Laboratory-scale filtration tests with coupons obtained from the fouled membranes also revealed that the contribution of the gel/cake layer to total filtration resistance was minor. Rather, constituents that were strongly bound to the membranes were mainly responsible for permeability decline. Chemical cleaning of the fouled membranes carried out after removal of the cake showed that silica played an important role in the decline in permeability. A considerable amount of organic matter which was mainly composed of carbohydrates and proteins was also desorbed from the fouled membranes.

Application of air backflushing technique in membrane bioreactor

1997 ◽  
Vol 36 (12) ◽  
pp. 259-266 ◽  
Author(s):  
C. Visvanathan ◽  
Byung-Soo Yang ◽  
S. Muttamara ◽  
R. Maythanukhraw
Keyword(s):  
Activated Sludge ◽  
Membrane Bioreactor ◽  
Hollow Fiber Membrane ◽  
Membrane Surface ◽  
Operation Time ◽  
Transmembrane Pressure ◽  
Stable Operation ◽  
Aeration Tank ◽  
Permeate Flux ◽  
Cake Layer

The optimum air backflushing and filtration cycle was investigated for a 0.1 μm hollow fiber membrane module immersed in an activated sludge aeration tank. It was found that 15 minutes filtration and 15 minutes air backflushing gave the best result both in terms of flux stability and net cumulative permeate volume. Although this cyclic operation could not completely remove the clogging, this process improved the flux by up to 371% compared to the continuous operation. During the long term runs, three different hydraulic retention times (HRT) of 12, 6 and 3 hours, corresponding to 0.16, 0.32 and 0.64 m3/m2.d of permeate flux respectively, were investigated. Stable operation was obtained at the HRT of 12 hours. Decrease in HRT led to rapid formation of a compact cake layer on the membrane surface thus increasing the transmembrane pressure. It was also noted that filtration pressure increases with increase in bioreactor MLSS concentration. With operation time, the MLVSS/MLSS value decreased without significant effect on the process performance, indicating that inorganic mass constantly accumulated in the bioreactor. All the experimental runs produced more than 90% removal of COD, and TKN. In terms of physical, chemical, biological and bacteriological parameters, the membrane bioreactor effluent was superior to the conventional activated sludge process.

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