混凝工艺去除合流污水中有机物及营养元素  

Organics and nutrients removal in combined wastewater by coagulation and flocculation process

作　　者：黄天寅[1] 李宁[2] 夏四清[3] 

机构地区：[1]苏州科技学院环境科学与工程系,苏州215011 [2]江苏大学环境学院,镇江212013 [3]同济大学污染控制与资源化研究国家重点实验室,上海200092

出　　处：《环境工程学报》2009年第9期1579-1584,共6页Chinese Journal of Environmental Engineering

基　　金：建设部研究开发资助项目(2008-K6-4)

摘　　要：通过系列杯罐试验混凝处理合流污水,采用硫酸铝(Al2(SO4)3)、硫酸铁(Fe2(SO4)3)、聚合氯化铝(PAC)和聚合氯化铝铁(PAFC)4种混凝剂均能有效去除污水中的TP、PO43--P、SS和COD。聚合金属盐(PAC和PAFC)混凝处理效果优于金属盐(Al2(SO4)3和Fe2(SO4)3),达到相同的处理效果的投加量明显低于后者。助凝剂采用聚丙烯酰胺(PAM)、聚乙烯醇(PVA)、自制的高分子聚合物(AN)和活化硅酸(AS),在保持较低混凝剂投加量的条件下可明显提高污水处理效果;添加助凝剂对强化PO34--P的去除作用不明显,PO43--P的去除仅与混凝剂的投加量相关。混凝剂和助凝剂对污水中NH3-N的去除作用相对不显著。SS去除率随混凝剂投加量的变化趋势说明混凝的机理较为复杂,可能存在多种混凝机理共同作用。The removal efficiency of inorganics, organics and nutrients of a combined sewage were studied by the coagulation-flocculation process in jar tests. Suspended solid （SS）, chemical oxygen demand （COD） , total phosphorus （TP） and orthophosphate （PO4^3--P） in the combined wastewater could be effectively removed using flocculants, such as aluminum sulfate （ Al2 （ SO4 ） 3 ） , ferric sulfate （ Fe2 （ SO4 ） 3 ） , polyaluminium chloride （PAC） and polyaluminium-ferric chloride （PAFC）. Poly-metal salt flocculants （PAC and PAFC） had more effective removal efficiency of pollutants than metal salt ones （ Al2 （ SO4 ） 3 and Fe2 （ SO4 ） 3 ） , which means that the former dosage is less than the later with the same removal efficiency of pollutants. Flocculant aids, such as cationic polyacrylamide （ PAM）, polyvinyl alcohol （ PVA）, a new polyelectrolyte made in laboratory （AN） and activated silica （AS） , dramatically enhanced the coagulation-floeculation process at relatively low coagulant dosage. The removal of PO4^3- -P only depended on the coagulant dosage ; and the flocculant aids had marginal effect on the process. The flocculants and flocculant aids didn＇t significantly improve NH3-N removal efficiency. The trend of SS removal efficiencies indicated that the flocculation mechanism is considerably complex and could present synergic flocculation mechanisms in the process.

关 键 词：合流污水 混凝 絮凝 混凝剂 助凝剂 有机物 营养元素 

分 类 号：X703.1[环境科学与工程—环境工程]