可变因素对高效絮凝沉淀工艺的影响特性试验研究  

Study on Variable Parameters Effect on High Efficiency Flocculation-settling Processes

作　　者：芮旻[1] 张明德[2] 许嘉炯[1] 沈裘昌[1] 郑国兴[1] 查人光[3] 

机构地区：[1]上海市政工程设计研究总院,上海200092 [2]上海市自来水市南有限公司,上海20002 [3]嘉兴市嘉源给排水有限公司,浙江嘉兴314000

出　　处：《净水技术》2007年第6期25-29,57,共6页Water Purification Technology

摘　　要：通过小试模拟中置式高密度沉淀池工艺运行过程,研究了多种可变影响因素对有外部循环污泥的高效絮凝沉淀工艺的影响特性。研究结果表明,活性污泥的投加显著地提高了原水的脱稳效果和颗粒絮凝效果。同时,对于除浊而言,存在一个合适的污泥投加量范围;混凝剂投加量对浑浊度去除有较大的影响,且该工艺下混凝剂投加量增大降低了出水中有机物的含量;试验中较低的聚丙烯酰胺(PAM)投加量即能改善出水浑浊度,随着PAM投加量的增大,出水浑浊度反而升高,当PAM在泥和水中的投加比例为1∶1时,出水浑浊度为最优。同时,采用正交实验考察了不同因素对高效絮凝沉淀工艺的处理效果的影响程度,分析得出影响试验出水浑浊度的显著性顺序依次为:聚合氯化铁投加量>机械絮凝搅拌转速>活性污泥投加量>PAM投加量。Based on laboratory experiment simulating operation process of High Efficiency Mid-flocculation and sedimentation tank, effect of variable parameters on coagulation-flocculation-settling processes with sludge return was investigated in this paper. The results showed that addition of activated sludge facilitated losing stability of raw water and enhanced flocculation capacity of particles apparently. In the meanwhile, there exists a suitable range for sludge dosage concerning turbidity removal efficiency. Coagulant dosage exhibited a strong influence on turbidity removal efficiency, with low organic concentration of outflow in presence of high coagulant addition dosage. Addition of PAM could decrease turbidity of outflow at a low dosage level of PAM, however, turbidity of outflow increased with increasing of PAM dosage. Turbidity of outflow reached the lowest level when ration of PAM towards sludge and water together equaled 1：1. According to the orthogonal experiments, the sequence for four main factors of this technology influencing turbidity could be expressed as： poly-ferric chloride （PFC） dosage, rotational speed of mechanical blender, activated sludge dosage, and PAM dosage.

关 键 词：饮用水处理 污泥循环 高效絮凝沉淀 

分 类 号：TU991.23[建筑科学—市政工程] X703.5[环境科学与工程—环境工程]