Effect of sludge retention time on sludge characteristics and membrane fouling of membrane bioreactor

被引:75
作者
Ouyang Ke [1 ]
Liu Junxin [1 ]
机构
[1] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China
基金
中国国家自然科学基金;
关键词
membrane bioreactor; sludge retention time; extracellular polymeric substances; wastewater treatment; WASTE-WATER TREATMENT; ACTIVATED-SLUDGE; PERFORMANCE; FILTRATION; MICROFILTRATION; OPERATION; SYSTEM;
D O I
10.1016/S1001-0742(08)62422-5
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Three identical membrane bioreactors (MBRs) were operated over 2 years at different sludge retention time (SRT) of 10 d, 40 d and no sludge withdrawal (NS), to elucidate and quantify the effect of SRT on the sludge characteristics and membrane fouling. The hydraulic retention times of these MBRs were controlled at 12 h. With increasing SRT, the sludge concentrations in the MBRs increased, whereas the ratio of volatile suspended solid to the total solid decreased, and the size of sludge granule diminished in the meantime. A higher sludge concentration at long SRT could maintain a better organic removal efficiency, and a longer SRT was propitious to the growth of nitrifiers. The performance of these MBRs for the removal of COD and NH4+-N did not change much with different SRTs. However, the bioactivity decreased as SRT increase. The measurement of specific oxygen uptake rates (SOUR) and fluorescence in situ hybridization (FISH) with rRNA-targeted oligonucleotide probes testified that SOUR and the proportion of the bacteria-specific probe EUB338 in all DAPI-stainable bacteria decreased with increasing SRT. The concentrations of total organic carbon, protein, polysaccharides and soluble extracellular polymeric substance (EPS) in the mixed liquor supernatant also decreased with increasing SRT. The membrane fouling rate was higher at shorter SRT, and the highest fouling rate appeared at a SRT of 10 d. Both the sludge cake layer and gel layer had contribution to the fouling resistance, but the relative contribution of the gel layer decreased as SRT increase.
引用
收藏
页码:1329 / 1335
页数:7
相关论文
共 27 条
[1]   Effects of sludge retention time on membrane fouling and microbial community structure in a membrane bioreactor [J].
Ahmed, Zubair ;
Cho, Jinwoo ;
Lim, Byung-Ran ;
Song, Kyung-Guen ;
Ahn, Kyu-Hong .
JOURNAL OF MEMBRANE SCIENCE, 2007, 287 (02) :211-218
[2]   Interpretation of fouling characteristics of ultrafiltration membranes during the filtration of membrane bioreactor mixed liquor [J].
Bae, TH ;
Tak, TM .
JOURNAL OF MEMBRANE SCIENCE, 2005, 264 (1-2) :151-160
[3]   Microfiltration of activated sludge wastewater - the effect of system operation parameters [J].
Bai, RB ;
Leow, HF .
SEPARATION AND PURIFICATION TECHNOLOGY, 2002, 29 (02) :189-198
[4]   Membrane fouling in membrane bioreactors for wastewater treatment [J].
Chang, IS ;
Le Clech, P ;
Jefferson, B ;
Judd, S .
JOURNAL OF ENVIRONMENTAL ENGINEERING, 2002, 128 (11) :1018-1029
[5]  
Chinese SEPA, 2002, WAT WAST MON METH
[6]   The activated sludge and microbial substances influences on membrane fouling in submerged membrane bioreactor: unstirred batch cell test [J].
Cho, JW ;
Song, KG ;
Ahn, KH .
DESALINATION, 2005, 183 (1-3) :425-429
[7]   Reversibility of fouling formed in activated sludge filtration [J].
Defrance, L ;
Jaffrin, MY .
JOURNAL OF MEMBRANE SCIENCE, 1999, 157 (01) :73-84
[8]   Contribution of various constituents of activated sludge to membrane bioreactor fouling [J].
Defrance, L ;
Jaffrin, MY ;
Gupta, B ;
Paullier, P ;
Geaugey, V .
BIORESOURCE TECHNOLOGY, 2000, 73 (02) :105-112
[9]  
DUBOIS M, 1956, ANAL CHEM, V28, P356, DOI DOI 10.1021/AC60111A017
[10]   Filtration characterisation for assessing MBR performance: three cases compared [J].
Evenblij, H ;
Geilvoet, S ;
van der Graaf, JHJM ;
van der Roest, HF .
DESALINATION, 2005, 178 (1-3) :115-124