水厂排泥水沉淀预处理回用试验研究

Reuse of sedimentation pretreatment of sludge water in waterworks

对水厂沉淀池排泥水进行了自然沉淀、混凝沉淀试验研究,结果表明:排泥水经过0.5 h自然沉淀后,上清液水质趋于稳定,浊度、CODMn、氨氮、细菌、藻密度、浮游动物死体和活体均得到不同程度的去除。继续延长沉淀时间对上清液水质的改善效果不明显,个别生物类指标反而有上升趋势。投加混凝剂可以进一步提高回用水水质,阳离子PAM投加量为0.8 mg/L时,排泥水浊度从2 219 NTU下降至1.59～3.84 NTU。

The test was conducted for the sludge water of the sedimentation tank by plain and coagulation sedimentation.The result showed that the supernatant quality was stable after 0.5 h sedimentation,turbidity,CODMn,ammonia nitrogen,total bacteria,amount of algae,dead and living plankton were removed by various degree.Extension of sedimentation time could not improve supernatant quality obviously,and some biological indicators had a rising tendency.Coagulant dosing could further improve the quality of reused water,and the turbidity of sludge water could be reduced from 2 219 NTU to 1.59 to 3.84 NTU when cationic PAM was dosed at 0.8 mg/L.