Behaviour of soluble microbial products in a membrane bioreactor

被引：191

作者：

Huang, X ^{[1
]}

Liu, R ^{[1
]}

Qian, Y ^{[1
]}

机构：

[1] Tsing Hua Univ, State Key Joint Lab, Dept Environm Sci & Engn Environm Simulat & Pollu, Beijing 100084, Peoples R China

来源：

PROCESS BIOCHEMISTRY | 2000年 / 36卷 / 05期

关键词：

membrane bioreactor; microbial product; accumulation; molecular weight; metabolic activity; membrane permeability;

D O I：

10.1016/S0032-9592(00)00206-5

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Synthetic wastewater was treated with a submerged membrane bioreactor to investigate the organic removal performance, as well as the behaviour of soluble microbial products during long-term operation. Satisfactory chemical oxygen demand (COD), total organic carbon (TOC) and biological oxygen demand (BOD) removal efficiencies were achieved, averaging over 90, 94 and 95%, respectively. The accumulation of TOC in the supernatant of the bioreactor and its degradation after 5 months of operation was observed. Among this accumulation, macromolecules with a molecular weight (MW) >100 000 accounted for 34%. A decrease in the supernatant TOC corresponded to a shift from large to small molecules. The organic substances with a MW > 100 000 decreased from 34 to 16%, whereas those with a MW < 30 000 increased from 33 up to 52%. The accumulation proved to be inhibitory towards the metabolic activity of the activated sludge, as well as contributing to the poor membrane permeability of the mixed liquor. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：401 / 406

页数：6

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