电混凝法处理城市污水的研究

现代地质 ›› 2007, Vol. 21 ›› Issue (Suppl): 181-185.

电混凝法处理城市污水的研究

胡伟武,冯传平,李淼,万力

中国地质大学水资源与环境学院，北京100083

收稿日期:2006-11-20 修回日期:2006-12-30 出版日期:2007-08-20 发布日期:2007-08-20
作者简介:胡伟武，男，副教授，博士研究生，1969年出生，环境工程专业，主要从事环境工程、精细化工工艺研究。
基金资助:
湖北省科学研究重点资助项目（2004D003）

Study on Treatment Municipal Wastewater with Electro-coagulation

HU Wei-wu, FENG Chuan-ping, LI Miao, WAN Li

School of Water Resources & Environment, China University of Geosciences, Beijing100083, China

Received:2006-11-20 Revised:2006-12-30 Online:2007-08-20 Published:2007-08-20

摘要/Abstract

摘要：

用化学混凝和电混凝方法处理城市污水是一个十分有效的技术。首先采用化学混凝法对城市污水进行预处理，实验中用CaO、Ca(OH)₂及FeCl₃作混凝剂并进行对比实验,得出用化学混凝法处理城市污水的最佳工艺条件为: 同时加入0.1%（m/V）熟石灰和0.1 mL/100 mL 的氯化铁(40%,m/V)，搅拌时间5 min，处理后污水的SS和浊度均最小，其最小值分别为6 mg/L、3.5 NTU，SS的去除率达到97%；剩余的COD和TP分别为166 mg/L、3.66 mg/L。然后再用电混凝方法对污水进行深度处理，用铁板作电极进行电化学处理并加入H₂O₂作电解液，得出电混凝法处理城市污水的最佳工艺条件为：电流密度20 mA/cm²，加入0.3 mL/L 的H₂O₂，电解时间20 min， COD和TP的去除率分别达到87.3%、97.5%。用上述方法处理后的城市污水达到城镇污水处理厂污染物排放国家一级标准。

关键词: 城市污水, 化学混凝, 电混凝

Abstract:

The treatment of municipal wastewater with chemical coagulation and electro-coagulation was an effective technology. The experiment was carried out with CaO, Ca(OH)₂ and FeCl₃ as the flocculants. Mixing time and the amount of reagent being used were investigated. It showed that the treatment effect was the best with 0.1%(m/V）Ca(OH)₂ and 0.1mL/100mL FeCl₃(40%,m/V) as the flocculants and mixing time is 5 minutes. The left SS and turbidity were 6 mg/L and 3.5 NTU, respectively. The SS removal ratio was up to 97%. The residual COD and TP were 166 mg/L and 3.66 mg/L, respectively. During the electro-coagulation,the COD removal ratio and the TP removal ratio were up to 87.1% and 97.5% at a current density of 20 mA/cm2 using 0.3‰ H₂O₂ as a reagent in 20 minutes. It reached the first class discharge standard of China national wastewater(COD＜50 mg/L,TP＜0.5 mg/L).

Key words: municipal wastewater, chemical coagulation, electro-coagulation

中图分类号:

X703

胡伟武,冯传平,李淼,万力. 电混凝法处理城市污水的研究[J]. 现代地质, 2007, 21(Suppl): 181-185.

HU Wei-wu, FENG Chuan-ping, LI Miao, WAN Li. Study on Treatment Municipal Wastewater with Electro-coagulation[J]. Geoscience, 2007, 21(Suppl): 181-185.

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