Sub-lethal effects of heavy metals on activated sludge microorganisms

被引：47

作者：

Chua, H ^{[1
]}

Yu, PHF

Sin, SN

Cheung, MWL

机构：

[1] Hong Kong Polytech Univ, Dept Civil & Struct Engn, Hong Kong, Peoples R China

[2] Hong Kong Polytech Univ, Dept Appl Biol & Chem Technol, Hong Kong, Peoples R China

来源：

CHEMOSPHERE | 1999年 / 39卷 / 15期

关键词：

activated sludge; copper; zinc; chromium; lead; heavy metals; COD adsorption capacity; COD removal;

D O I：

10.1016/S0045-6535(99)00203-9

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The effects of heavy metals, at sub-lethal concentrations, on activated sludge microbial ecosystem were investigated. Adsorption capacity and rate of copper, chromium, lead and zinc on microbial flocs were much faster than that of organic matters. Metals affected not only the adsorption rate of organic matters but also the COD adsorption capacity of the activated sludge. Effects of heavy metals, on wastewater treatment performance of a sequencing batch reactor were also studied. Metal-laden wastewater at sub-lethal levels affected the performance to different extents, depending on the hydraulic retention time. Metal ions acted as a strong competitor against the organic compounds for active sites on the bioflocs instead of acting as a toxic microbial inhibitor, thus hampering organic adsorption and affecting the COD removal efficiency under shorter HRTs. (C) 1999 Elsevier Science Ltd All rights reserved.

引用

页码：2681 / 2692

页数：12

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