城市纳污河道废水化学强化一级处理的研究

针对山东省淄博市猪龙河和白家河城市纳污河道水质的特点，进行了化学强化一级处理该河道废水的研究.初步筛选出聚合氯化铝（PAC）、阳离子型聚丙烯酰胺（CPAM）、阴离子型聚丙烯酰胺（APAM）和聚二甲基二烯丙基氯化铵（PDMDAAC）混凝剂，研究了它们对该废水中COD、溶解性COD（SCOD）、浊度、总氮（NT）和总磷（PT）的去除效果，选出了适于该废水水质的混凝剂为APAM和PDMDAAC.研究了pH值和表面负荷对混凝效果的影响.研究结果发明，APAM在最佳投加量0.3?mg/L时，对COD和SCOD的去除率分别为44％～64％和33％～67％；PDMDAAC在最佳投加量0.5?mg/L时，对COD和SCOD的去除率分别为51％～60％和21％～67％.APAM和PDMDAAC对NT去除率较低，约为15％～20％，但对PT具有较高的去除率，为60％～80％.APAM和PDMDAAC对COD的去除效果受pH值影响较小，在pH 7～10范围内均具有较好的混凝效果.研究结果表明，表面负荷从0.8?m3/m2·h提高到1.2?m3/m2·h时，COD和浊度去除率变化不大.〖GK2*2]Abstract

Study of chemically enhanced primary treatment of wastewater received by urban rivers

The chemically enhanced primary treatment of wastewater received by the Zhulong River and Baijia River in the city of Zibo, Shandong, China has been studied. According to the characteristics of the rivers, their water quality, and the wastewater received, several coagulants were selected to use in the experiments conducted at the rivers, including polyaluminum chloride (PAC), cationic polyacrylamide (CPAM), anionic polyacrylamide (APAM) and polydimethyldiallylammonium chloride (PDMDAAC). Their efficiencies for removing COD, SCOD, turbidity, NT and PT were investigated and compared. APAM and PDMDAAC were found to be the most appropriate coagulants. The impact of surface load and pH on the effectiveness of coagulation was also considered and analyzed. The results showed that at the optimum dosage of APAM (0.3?mg/L), the COD and SCOD removal efficiencies reached to 44％～64％ and 33％～67％, respectively, while at the optimum dosage of PDMDAAC (0.5?mg/L), COD and SCOD removal efficiencies were 51％～60％ and 21％～67％, respectively. Both APAM and PDMDAAC achieved a lower efficiency, 15％～20％, in removing NT, whereas they had a higher PT removal efficiency that was 60％～80％. It was found that pH had a very little effect on the efficiency of COD removal, and better coagulation could be achieved when pH was in the range of 7～10. The results also showed that there was insignificant change in COD and turbidity removal efficiency when surface load was increased from 0.8?m3/m2·h to 1.2?m3/m2·h.