强化混凝消除微污染水中有机氯的研究

以聚合氯化铝和聚合硫酸铁为絮凝剂,采用强化混凝的处理方法,对微污染水中有机氯(OCPS)的消除进行了研究,考察了混凝剂投加量、pH值、原水浊度、温度和凹凸棒土助凝剂等因素对OCPS消除效果的影响.结果表明,pH值在5~6,PAC投加量为14mg/L时,OCPS及浊度的去除率分别达到57.03%~74.83%和98.18%;OCPS和浊度的去除率随原水浊度的增加而增加;低温有利于OCPS去除;活性炭和改性凹凸棒土作为助凝剂对OCPs的去处率有不同程度地提高,分别投加5mg/L改性凹凸棒土和活性炭,OCPS去除率分别达到47.4%~78.2%和22.8%~79.5%,低投加量下改性凹凸棒优于活性炭;混凝对DDT去除好于HCHs;PFS去除OCPS的效果好于PAC.

Study on the elimination of OCPSfrom micro-polluted water by enhanced coagulation

The elimination of OCPs in micro-polluted water by enhanced coagulation was studied with poly aluminum chloride (PAC) and poly ferric sulfate (PFS) respectively. The effects of dosage of coagulant, pH value,initial turbidity, temperature and adding the modified attapulgite on the elimination efficiencies of OCPS were tested. Under the condition of pH5~6 and PAC 14mg/L, the removal rates of OCPS and turbidity reached 57.03~74.83% and 98.18%. The removal rates of OCPS and turbidity increased with the increasing in initial turbidity. Low temperature was conducive to the removal of OCPs.The removal rates of OCPS were enhanced to different extent when activated carbon and attapulgite were added respectively as the coagulation aids. The removal rate of OCPS reached 47.4%~78.2% and 22.8%~79.5%under the condition of modified attapulgite and activated carbon dosage of 5mg/L.Modified attapulgite is superior to activated carbon in low dosage. The removal rate of DDT is beter than BHC in the coagulation progress.The removal rates of OCPS treated with PFS were higher than that of with PAC.