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粉煤灰-聚硅铁混凝剂处理含铅废水研究
谭娟,于衍真,程磊
(济南大学土木建筑学院,山东济南 250022)

摘要:

以粉煤灰提取液和高铁酸钾为原料,制备不同n(Si)/n(FeO₄2-)的复合粉煤灰-聚硅铁混凝剂, 考察n(Si)/n(FeO₄2-)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(FeO₄2-)=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％。

关键词: 水处理煤灰-聚硅铁混凝剂含铅废水混凝实验

DOI：10.3969/j.issn.1673-5005.2013.01.030

分类号::X 703.5

基金项目: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)

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

TAN Juan, YU Yan-zhen, CHENG Lei

(School of Civil Engineering and Architecture in University of Jinan, Jinan 250022, China)

Abstract:

Fly ash-silicon-ferric coagulant with various Si/FeO₄2-molar ratio (n(Si)/n(FeO₄2-)) was prepared by fly ash extract and K₂FeO₄. The influence of Si/FeO₄2-molar ratio on coagulation efficiency of lead wastewater treatment was investigated. 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(FeO₄2-) varies from 3.5 to 5.0. The flocs of fly ash-silicon-ferric coagulant 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.

Key words: water treatment fly ash-silicon-ferric coagulant lead wastewater coagulation experiment