钛铁复合药剂强化混凝处理低温低浊水试验研究

Experimental Study on Enhanced Coagulation for Low Temperature and Low Turbidity Water Treatment with Ferrotitanium Compound Reagent

为探究钛铁复合药剂(PTFC)对低温低浊水体强化混凝效果,研究利用慢碱滴定法制备了新型PTFC。通过对比聚合硫酸钛(PTS)在不同pH下浑浊度、DOC、Zeta电位等变化情况,研究新型PTFC混凝处理效果及混凝机理。结果表明,钛铁摩尔比为1∶1、盐基度为0.75的PTFC,较PTS具有更好的混凝效果。在最佳pH和投加量下,对有机物去除率能达到60%以上,浑浊度去除率能够达到90%左右。混凝剂表面结构及机理分析的研究表明,PTFC表面出现了更加密实的网状结构,吸附电中和与网捕卷扫在强化混凝过程中发挥主要作用。

In order to explore the enhanced coagulation effect of ferrotitanium composite reagent(PTFC)on low temperature and low turbidity water,a new PTFC was prepared by slow alkali titration method.By comparing the changes of turbidity,disolved organic carbon(DOC),Zeta potential and other indices of polyferric sulfate(PTS)at different pH values,the treatment effect and coagulation mechanism of new PTFC were studied.Results showed that PTFC with Ti and Fe molar ratio of 1∶1 and basicity of 0.75 had better coagulation effect than PTS.Under the optimal pH and dosage,the removal rate of organic matter could reach more than 60%and turbidity could reach about 90%.The results of surface structure and mechanism analysis of the coagulant showed that the surface of the PTFC had a more dense network structure,which made the coagulation effect better.Adsorption neutralization and net capture and sweep played a major role in enhanced coagulation process.