Hybrid growth membrane bioreactor (HG-MBR): The indirect impact of sludge retention time on membrane fouling

In the membrane bioreactor (MBR) treating municipal wastewater, the effect of sludge retention time (SRT) on the contents of the extracellular polymeric substances (EPS), tightly bound EPS (TB) and loosely bound EPS (LB) and the ratios of protein and polysaccharide in TB and LB was studied. With the extension of SRT the EPS increased and the ratios of protein and polysaccharide in TB and LB changed. The above changes influenced the charge distribution of bacterial surface, increased the proportion of hydrophilicity and hydrophobicity on the bacterial surface, changed the bacteria from the instable (R-type) to the stable (S-type), decreased the Zeta potential and increased the values of sludge volume index (SVI). The correlation analysis for the main parameters of fouling resistance was performed by SPSS software, and it was found that the correlation coefficient (rp) was -0.818 for Zeta potential, 0.853 for the content of suspended solids in supernatant and 0.832 for relative hydrophobicity, respectively. SRT of the MBR should be controlled below 120 times of the minimum generation-time of dominant bacteria considering the membrane fouling and sludge characteristics.

Download Full-text

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

Journal of Membrane Science ◽

10.1016/j.memsci.2006.10.036 ◽

2007 ◽

Vol 287 (2) ◽

pp. 211-218 ◽

Cited By ~ 181

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

Download Full-text

Impacts of sludge retention time on sludge characteristics and membrane fouling in a submerged osmotic membrane bioreactor

Bioresource Technology ◽

10.1016/j.biortech.2014.03.058 ◽

2014 ◽

Vol 161 ◽

pp. 340-347 ◽

Cited By ~ 88

Author(s):

Xinhua Wang ◽

Yao Chen ◽

Bo Yuan ◽

Xiufen Li ◽

Yueping Ren

Keyword(s):

Retention Time ◽

Membrane Fouling ◽

Membrane Bioreactor ◽

Sludge Characteristics ◽

Sludge Retention Time ◽

Osmotic Membrane Bioreactor

Download Full-text

Effects of Sludge Retention Time on the Performance of Anaerobic Ceramic Membrane Bioreactor Treating High-Strength Phenol Wastewater

Archaea ◽

10.1155/2020/8895321 ◽

2020 ◽

Vol 2020 ◽

pp. 1-10

Author(s):

Chunhua He ◽

Chuanhe Yang ◽

Shoujun Yuan ◽

Zhenhu Hu ◽

Wei Wang

Keyword(s):

Retention Time ◽

Membrane Fouling ◽

Membrane Bioreactor ◽

Ceramic Membrane ◽

High Strength ◽

Attractive Alternative ◽

Sludge Retention Time ◽

Time Operation ◽

Degrading Bacteria ◽

Phenol Wastewater

Anaerobic ceramic membrane bioreactor (AnCMBR) is an attractive alternative for the treatment of high-strength phenol wastewater, but the effects of sludge retention time (SRT) on the performance and membrane fouling are still unclear. The results indicated that the AnCMBR was successfully employed to treat high-strength wastewater containing 5 g phenol L-1. The removal efficiencies of phenol and chemical oxygen demand (COD) reached over 99.5% and 99%, respectively, with long SRT and short SRT. SRT had no obvious effect on the performance of the AnCMBR treating high-strength phenol wastewater with long time operation. The strong performance robustness of AnCMBR benefited from the enrichment of hydrogenotrophic methanogens and syntrophic phenol-degrading bacteria. However, the decline of SRT led to a more severe membrane fouling in the AnCMBR, which was caused by the small size of sludge flocs and high concentration of protein in the biopolymers. Therefore, this work presented a comprehensive insight to the feasibility and robustness of the AnCMBR for treating high-strength phenol wastewater.

Download Full-text

Effect of 200 days' sludge retention time on performance of a pilot scale submerged membrane bioreactor for high strength industrial wastewater treatment

Water Science & Technology ◽

10.2166/wst.2006.362 ◽

2006 ◽

Vol 53 (11) ◽

pp. 269-276 ◽

Cited By ~ 6

Author(s):

C.T. Hay ◽

D.D. Sun ◽

S.L. Khor ◽

J.O. Leckie

Keyword(s):

Retention Time ◽

Industrial Wastewater ◽

Membrane Bioreactor ◽

Hydraulic Retention Time ◽

High Strength ◽

Pilot Scale ◽

Submerged Membrane Bioreactor ◽

Sludge Retention Time ◽

Organic Removal ◽

Sludge Concentration

A high strength industrial wastewater was treated using a pilot scale submerged membrane bioreactor (MBR) at a sludge retention time (SRT) of 200 d. The MBR was operated at a high sludge concentration of 20 g/L and a low F/M ratio of 0.11 during 300 d of operation. It was found that the MBR could achieve COD and TOC overall removal efficiencies at more than 99 and 98% TN removal. The turbidity of the permeate was consistently in the range of 0.123 to 0.136 NTU and colour254 absorbance readings varied from 0.0912 to 0.0962 a.u. cm−1. The sludge concentration was inversely proportional to the hydraulic retention time (HRT), yielded excellent organic removal and extremely low sludge production (0.0016 kgVSS/day).

Download Full-text