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

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.

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

Nitrogen Removal in a Real-Time Controlled Sequencing Batch Membrane Bioreactor

2010 ◽  
Vol 5 (3) ◽  
Author(s):  
Cheng-Nan Chang ◽  
Li-Ling Lee ◽  
Han-Hsien Huang ◽  
Ying-Chih Chiu
Keyword(s):  
Real Time ◽  
Nitrogen Removal ◽  
Membrane Bioreactor ◽  
Synthetic Wastewater ◽  
Real Time Control ◽  
Time Control ◽  
Cake Layer ◽  
On Line ◽  
Solid Liquid ◽  
Solid Liquid Separation

The performance of a real-time controlled Sequencing Batch Membrane Bioreactor (SBMBR) for removing organic matter and nitrogen from synthetic wastewater has been investigated in this study under two specific ammonia loadings of 0.0086 and 0.0045g NH4+-N gVSS−1 day−1. Laboratory results indicate that both COD and DOC removal are greater than 97.5% (w/w) but the major benefit of using membrane for solid-liquid separation is that the effluent can be decanted through the membrane while aeration is continued during the draw stage. With a continued aeration, the sludge cake layer is prevented from forming thus alleviating the membrane clogging problem in addition to significant nitrification activities observed in the draw stage. With adequate aeration in the oxic stage, the nitrogen removal efficiency exceeding 99% can be achieved with the SBMBR system. Furthermore, the SBMBR system has also been used to study the occurrence of ammonia valley and nitrate knee that can be used for real-time control of the biological process. Under appropriate ammonia loading rates, applicable ammonia valley and nitrate knee are detected. The real-time control of the SBMBR can be performed based on on-line ORP and pH measurements.

Antibiotic transformation in an anaerobic membrane bioreactor linked to membrane biofilm microbial activity

2021 ◽  
pp. 111456
Author(s):  
Moustapha Harb ◽  
Ali Zarei-Baygi ◽  
Phillip Wang ◽  
Christelle BouNehme Sawaya ◽  
Daniel L. McCurry ◽  
...  
Keyword(s):  
Microbial Activity ◽  
Membrane Bioreactor ◽  
Anaerobic Membrane Bioreactor
Sign in / Sign up

Export Citation Format

Share Document