连续暴露于铜对膨胀型活性污泥性质和胞外聚合物（EPS）的影响。
The effect of continuous exposure of copper on the properties and extracellular polymeric substances (EPS) of bulking activated sludge.
机构信息
Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai 200433, China.
出版信息
Environ Sci Pollut Res Int. 2011 Nov;18(9):1567-73. doi: 10.1007/s11356-011-0492-6. Epub 2011 May 17.
INTRODUCTION
This study investigated the effect of copper on chemical oxygen demand (COD) removal efficiency and on the properties (mainly settling and dewatering) and the composition of extracellular polymeric substances (EPS) when 20 mg/L Cu(II) was continuously dosed to a sequencing batch reactor (SBR) inoculated with activated sludge.
MATERIALS AND METHODS
The results showed that the continuous addition of 20 mg/L Cu(II) seriously inhibited the removal of sodium benzoate (provided as a model organic pollutant) by activated sludge in a SBR.
RESULTS AND DISCUSSION
After 40 days of acclimation, the removal efficiency presented a slight but unsteady recovery and the settling and dewatering properties improved, indicating that sludge bulking had been inhibited. Additionally, the proportion of loosely bound EPS in the total EPS increased with time and the relative composition of the total organics was polysaccharide > humic substances > protein > DNA.
CONCLUSION
The effects of copper on the composition of EPS and the settling and dewatering properties of bulking activated sludge were also discussed for the first time in this paper.
简介
本研究考察了铜对化学需氧量（COD）去除效率的影响，以及当连续向接种活性污泥的序批式反应器（SBR）投加 20mg/L Cu(II) 时，对胞外聚合物（EPS）特性（主要是沉降和脱水）和组成的影响。
材料与方法
结果表明，连续添加 20mg/L Cu(II) 严重抑制了 SBR 中活性污泥对苯甲酸钠（作为模型有机污染物）的去除。
结果与讨论
经过 40 天的驯化，去除效率呈现出轻微但不稳定的恢复，且沉降和脱水性能得到改善，表明污泥膨胀已得到抑制。此外，EPS 中松散结合 EPS 的比例随时间增加，总有机物的相对组成是多糖＞腐殖质＞蛋白质＞DNA。
结论
本文首次讨论了铜对 EPS 组成以及膨胀活性污泥的沉降和脱水性能的影响。
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