Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai 200433, China.
Environ Sci Pollut Res Int. 2011 Nov;18(9):1567-73. doi: 10.1007/s11356-011-0492-6. Epub 2011 May 17.
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.
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.
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.
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.
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。
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。
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。
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。
