气动絮凝用于城镇污染河水处理的试验研究

EXPERIMENTAL INVESTIGATION ON TREATMENT OF CITIES AND TOWNS POLLUTED RIVER WATER BY PNEUMATIC FLOCCULATION

在设定的絮凝条件下,以小城镇典型污染河水为研究对象,聚合氯化铁铝(PFAC)和聚丙烯酰胺(PAM)为试验药剂,COD、浊度、总磷和溶解氧为测定指标,进行了气动絮凝试验。结果表明,以微孔曝气头充气,当混合充气量、第1格絮凝充气量和第2格絮凝充气量分别达到160、130、56 L·h-1时,COD、浊度和总磷的去除率分别为68·9%、93.6%和72.4%;以孔径2 mm穿孔管充气,当混合充气量、第1格絮凝充气量和第2格絮凝充气量分别达到220、180、76 L·h-1时,COD、浊度和总磷的去处理率分别为67.6%、92.7%和68.0%。在保证处理效果的前提下,2种充气方式均能使沉淀池出水的溶解氧含量达到2 mg·L-1左右。

Cities and towns polluted river water as study object;polymerization Fe-Al chloride（PFAC） and polyacrylamide（PAM） as coagulant;COD,turbidity,total phosphorus as determination standard respectively,experiment at stated coagulation condition.The experiment results showed that,when aerated with microporous diffuser,aeration levels of mixing,flocculation＇s first and second stage was 160,130,56 L·h^-1 respectively,the removalrate of COD,turbidity and total phosphorus were 68.9%,93.6% and 72.4% respectively;when aerated with perforated pipe,aeration levels of mixing,flocculation＇ first and second stage were 220,180,76 L·h^-1 respectively,the removal rate of COD,turbidity and total phosphorus were 67.6%,92.7% and68.0% respectively.All the two modes of aeration can keep the dissolved oxygen content of sedimentation tank＇s effluent at 2 mg·L^-1 withoutinfluencing the treatment effect.