Wen Qin-Xue, Liu Ai-Cui, Chen Zhi-Qiang, Shi Han-Chang, Lü Bing-Nan
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Huan Jing Ke Xue. 2012 Apr;33(4):1278-82.
Polymeric aluminum-iron (PAFC) was added at the end of aeration tank to enhance phosphorus removal, so that the phosphorus concentration in the effluent could meet the calss A standard in municipal sewage treatment plant pollutant discharge standard (GB 18918-2002). The characteristics of extracellular polymer substances (EPS) and bio-flocculation for the activated sludge in the A2/O system were analyzed in the experiment. The results showed that, the gross of EPS varied little with the increase in PAFC dosage, while, the ratio of albumen to polysaccharide declined from 3.30 to 2.30. When the PAFC dosage increased, the concentration of Al3+ in EPS increased during the whole anaerobic-anoxic-aerobic cycle. The flocs of activated sludge became larger after PAFC addition, Zeta potential of the effluent dropped significantly from - 15.83 mV to -21.20 mV and sludge yield increased. Therefore, bio-flocculation of the activated sludge in the A2/O system improved when a proper amount of PAFC was added, subsequently improve the water quality of the effluent.
在曝气池末端投加聚合铝铁（PAFC）以强化除磷，使出水磷浓度满足《城镇污水处理厂污染物排放标准》（GB 18918 - 2002）中的一级A标准。实验分析了A2/O系统中活性污泥的胞外聚合物（EPS）特性及生物絮凝性能。结果表明，随着PAFC投加量增加，EPS总量变化不大，而蛋白与多糖的比值从3.30降至2.30。PAFC投加量增加时，在整个厌氧 - 缺氧 - 好氧周期内，EPS中Al3+浓度升高。投加PAFC后活性污泥絮体变大，出水的Zeta电位从 - 15.83 mV显著降至 - 21.20 mV，污泥产量增加。因此，投加适量PAFC可改善A2/O系统中活性污泥的生物絮凝性能，进而提升出水水质。
