Effects of sludge retention time on membrane fouling and microbial community structure in a membrane bioreactor

2007 ◽  
Vol 287 (2) ◽  
pp. 211-218 ◽  
Author(s):  
Zubair Ahmed ◽  
Jinwoo Cho ◽  
Byung-Ran Lim ◽  
Kyung-Guen Song ◽  
Kyu-Hong Ahn
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Retention Time ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Sludge Retention Time

Microbial community structure of membrane fouling film in an intermittently and continuously aerated submerged membrane bioreactor treating domestic wastewater

2004 ◽  
Vol 49 (2) ◽  
pp. 255-261 ◽  
Author(s):  
B.-R. Lim ◽  
K.-H. Ahn ◽  
P. Songprasert ◽  
J.W. Cho ◽  
S.H. Lee
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Domestic Wastewater ◽  
Experimental Results ◽  
Submerged Membrane Bioreactor ◽  
Membrane Biofouling ◽  
Nocardia Sp

There was an observable difference in microbial community structure between suspended microorganisms and membrane biofouling film in intermittently and continuously aerated SMBRs. The dominant quinone type of membrane biofouling film in an intermittently aerated SMBR was ubiquinone (UQs)-8, -10 followed by menaquinone (MKs)-8(H4) and -8(H2). But that of the continuously aerated SMBR was UQs-10, -8 followed by MKs-6 and -8(H4). The experimental results also showed that the conditions of an intermittently aerated SMBR may contribute to biofouling by Pseudomonas, Moraxella, Vibrio (quinone type UQ-8), Staphylococcus warneri (quinone type MK-7), Micrococcus sp. (quinone type MK-8(H2)) and Nocardia sp. (quinone type MK-8(H4)), but biofouling in a continuously aerated SMBR may be due to Paracoccus sp. (quinone type: UQ-10) and Flavobacterium species (quinone type: MK-6). The microbial diversities in the intermittently aerated SMBR were 10.9 and 9.4 for biofouling film and suspended microorganisms, respectively. For the continuously aerated SMBR, the results were 10.4 and 10.5 for biofouling film and suspended microorganisms, respectively.

scholarly journals Performance and Microbial Community Structure of Anaerobic Membrane Bioreactor for Lipids-Rich Kitchen Waste Slurry Treatment: Mesophilic and Thermophilic Processes

Processes ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 879 ◽  
Author(s):  
Xiaolan Xiao ◽  
Wansheng Shi ◽  
Wenquan Ruan
Keyword(s):  
Fatty Acids ◽  
Community Structure ◽  
Microbial Community ◽  
Removal Efficiency ◽  
Microbial Community Structure ◽  
Membrane Bioreactor ◽  
Cod Removal ◽  
Kitchen Waste ◽  
Anaerobic Membrane Bioreactor ◽  
Increasing Temperature

The performance and microbial community structure for treating lipids-rich kitchen waste slurry in mesophilic Anaerobic Membrane Bioreactor (m-AnMBR) and thermophilic AnMBR (t-AnMBR) were compared in this study. Higher Organic Loading Rate (OLR) of 12 kg-COD/(m3·d), better Chemical Oxygen Demand (COD) removal efficiency over 98%, stronger stability with Volatile Fatty Acids (VFAs)/alkalinity below 0.04, higher flux with 18 L/(m2·h) and lower Long Chain Fatty Acids (LCFAs) concentration of 550 mg/L were obtained in the m-AnMBR. Directly increasing temperature from 39 to 55 °C resulted in a collapse of the t-AnMBR. Acclimation via gradually increasing temperature made the t-AnMBR run successfully with lower OLR and COD removal efficiency of 7.5 kg-COD/(m3·d) and 96%. An obvious discrepancy of microbial community structure was presented between the m-AnMBR and t-AnMBR via the 16S rRNA gene sequence analysis. The Methanomethylovorans and Methanoculleus were dominant in the t-AnMBR instead of Methanobacterium and Methanothrix in the m-AnMBR.

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