Continuous foam separation processing of wastewater by using coagulant and protein

针对城市污水处理系统普遍采用的沉淀法，研究了一种由泡沫分离和过滤组成的污水处理系统，该系统首先采用泡沫分离工艺去除悬浮物。实验结果表明，泡沫分离的最佳工艺条件为：流量10 L/min(水力停留时间6min)，聚合氯化铝投加量20 mg/L，酪蛋白投加量10 mg/L。泡沫分离过程对浊度和总有机碳(TOC)的平均去除分别为87%和52%。泡沫分离出水中的有机物大部分是易生物降解的溶解物质，泡沫分离出水经过过滤(水力停留时间2小时，过滤速度20m/d)处理。结果表明，整个系统对浊度和TOC的平均去除效果分别达到92%和81%。

Instead of a popular sedimentation adopted in urban sewage treatment system, a new sewage treatment system composed of foam separation and filtration was studied.In the proposed system, at first, suspended matters are removed by foam separation process. Then the rest of suspended matters and dissolved matters are removed by filtration which is expected both physical and biological treatments.These experiments obtained the following results ; optimum conditions at foam separation process were that flow, PAC dosage and casein dosage were 10 l/min (HRT 6 min), 20 mg Al/l and 10 mg/l , respectively. The average of turbidity and total organic carbon (TOC) removals at the foam separation process were 87% and 52%, respectively. Most part of organic substances in effluent from the foam separation process was dissolved matters which were easily biological decomposed The effluent of foam separation process was treated by the filtration (HRT 2h, filtration rate 20m_/d). the result was as follows ; the average of turbidity and TOC removal through the whole system with the filtrarion reached 92% and 81%, respectively.