粉煤灰-聚硅铁混凝剂处理含铅废水研究  

Study on coagulation behavior of fly ash-silicon-ferric coagulant in treating lead wastewater

作　　者：谭娟[1] 于衍真[1] 程磊[1] 

机构地区：[1]济南大学土木建筑学院,山东济南250022

出　　处：《中国石油大学学报（自然科学版）》2013年第1期173-176,共4页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(51178207);山东省自然科学基金项目(ZR2011EEM003);山东省高等学校科技计划项目(J12LG52)

摘　　要：以粉煤灰提取液和高铁酸钾为原料,制备不同n(Si)/n(FeO42-)的复合粉煤灰-聚硅铁混凝剂,考察n(Si)/n(FeO42-)对粉煤灰-聚硅铁混凝剂处理含铅废水混凝效果的影响,并对比粉煤灰-聚硅铁混凝剂与聚合磷硫酸铁对含铅废水的混凝效率。结果表明:对于含铅废水,n(Si)/n(FeO42-)=3.5～5.0时,其浊度、色度和Pb2+的去除率均在90%以上;与聚合磷硫酸铁相比,粉煤灰-聚硅铁混凝剂形成的矾花直径大、沉降速度快,混凝效果更好;在实验投药量范围内粉煤灰-聚硅铁混凝剂对Pb2+的去除率比聚合磷硫酸铁高约10%～20%。Fly ash-silicon-ferric coagulant with various Si/FeO42-molar ratio （n（ Si）/n（ FeO42） ） was prepared by fly ash extract and K2 FeO4. The influence of Si/FeO42-molar ratio on coagulation efficiency of lead wastewater treatment was investi- gated. The coagulation efficiency was compared using fly ash-silicon-ferric coagulant as coagulant in treating lead wastewater and that using poly ferric phosphate sulfate （PFPS） as coagulant. The results show that the removal of turbidity, color and Pb2＋ for lead wastewater is over 90% when n（ Si）/n（ FeO42） varies from 3.5 to 5.0. The flocs of fly ash-silicon-ferric coag- ulant have large diameter, high sedimentation rate and good performance to deal with the lead wastewater in comparison with that using PFPS. Fly ash-silicon-ferric coagulant gives more Pb2＋ removal rate of 10% -20% than PFPS at given dose range in treating lead wastewater.

关 键 词：水处理 煤灰-聚硅铁混凝剂 含铅废水 混凝实验 

分 类 号：X703.5[环境科学与工程—环境工程]