混凝气浮与混凝沉淀工艺处理低温低浊水水库水试验对比

摘要

The pilot treatment effects between coagulation -dissolved air flocculation process (DAF) and coagulation -sedi-mentation process for the low temperature and turbidity water of Queshan reservoir are compared .The polyaluminium chloride iron (PAFC ) coagulant is used .The dosing quantity of PAFC of DAF process is 5 mg/L ,17% lower than that in coagulation-sedimentation process .The continuous test shows that for the low temperature and turbidity reservoir water the DAF pro-cess is superior to coagulation-sedimentation process .The removal rates of turbidity ,particle counts ,CODMn ,UV254 and DOC by DAF are 7 .7% ,12 .8% ,3 .9% ,5 .1% and 8 .5% respectively higher than those by sedimentation process .%采用中试试验对比研究了混凝－气浮与混凝－沉淀工艺对鹊山水库典型低温低浊水的处理效果。试验采用聚合氯化铝铁混凝剂，对气浮工艺PAFC投加量采用5 mg／L （以Al3＋计），较沉淀工艺投加量低17％。连续试验表明，气浮工艺处理低温低浊水优于沉淀工艺，对浊度、颗粒数、CODMn、UV254、DOC的去除率分别高7．7％、12．8％、3．9％、5．1％和8．5％。