Effect of mixed liquor pH on the removal of trace organic contaminants in a membrane bioreactor

被引：112
作者：
Tadkaew, Nichanan [1 ]
Sivakumar, Muttucumaru [1 ]
Khan, Stuart J. [2 ]
McDonald, James A. [2 ]
Nghiem, Long Duc [1 ]
机构：
[1] Univ Wollongong, Sch Civil Min & Environm Engn, Wollongong, NSW 2522, Australia
[2] Univ New S Wales, Water Res Ctr, Sydney, NSW 2052, Australia
来源：
BIORESOURCE TECHNOLOGY | 2010年 / 101卷 / 05期
关键词：
Membrane bioreactor (MBR); Trace organics; Mixed liquor pH; Biodegradability; Adsorption; WASTE-WATER TREATMENT; ENDOCRINE DISRUPTING COMPOUNDS; TREATMENT PLANTS; SEPARATION BIOREACTORS; PHARMACEUTICALS; PERFORMANCE; TECHNOLOGY; REUSE; BIODEGRADABILITY; MICROPOLLUTANTS;
D O I：
10.1016/j.biortech.2009.09.082
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
Experiments were conducted over approximately 7 months to investigate the effects of mixed liquor pH (between pH 5 and 9) on the removal of trace organics by a submerged MBR system. Removal efficiencies of ionisable trace organics (sulfamethoxazole, ibuprofen, ketoprofen, and diclofenac) were strongly pH dependent. However, the underlying removal mechanisms are different for ionisable and non-ionisable compounds. High removal efficiencies of these ionisable trace organics at pH 5 could possibly be attributed to their speciation behaviour. At this pH, these compounds exist predominantly in their hydrophobic form. Consequently, they could readily adsorb to the activated sludge, resulting in higher removal efficiency in comparison to under less acidic conditions in the reactor. Removal efficiencies of the two non-ionisable compounds bisphenol A and carbamazepine were relatively independent of the mixed liquor pH. Results reported here suggest an apparent connection between physicochemical properties of the compounds and their removal efficiencies by MBRs. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1494 / 1500
页数：7
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