电氧化处理印染行业膜后浓水的研究

doi:10.19965/j.cnki.iwt.2021-0162

摘要/Abstract

摘要：

采用电氧化法处理印染行业膜后浓水，以Ti/PbO₂为阳极、Ti为阴极，考察了流速、初始pH、电流密度和氯离子投加量等对COD去除的影响，并探讨了其氧化机理与反应动力学。结果表明，在流速100 mL/min，初始pH=6，电流密度10 mA/cm²，氯离子质量浓度500 mg/L时，电解120 min后，COD的去除率为81.3%，电流效率为43.5%，降解单位COD能耗为36.2 kW·h/kg，且COD主要被羟基自由基和活性氯氧化去除，其降解过程符合一级动力学模型，反应速率常数为0.013 3 min^-1。膜后浓水经电氧化处理后，出水水质满足《污水综合排放标准》（GB 8978-1996）一级标准。

关键词: 电氧化, 浓水, 印染废水, 电流效率, 能耗

Abstract:

The concentrated wastewater of membrane from dyeing industry is treated by electrochemical oxidation process. The effects of flow rate, initial pH, current density, and chloride ion concentration were investigated with Ti/PbO₂ anode and Ti cathode. And the mechanism and reaction kinetics were also studied. The results showed that COD removal rate of 81.3%, current efficiency of 43.5%, and energy consumption per unit COD of 36.2 kW·h/kg were achieved with operating conditions of flow rate of 100 mL/min, initial pH of 6, current density of 10 mA/cm², and chloride ion concentration of 500 mg/L. COD was mainly oxidized by hydroxyl radical and active chlorine. Besides, COD removal followed first order kinetic model, and the reaction rate constant of 0.013 3 min^-1 was obtained. The effluent treated by electro-chemical oxidation met the first class standard of Integrated Wastewater Discharge Standard(GB 8978-1996).

Key words: electrochemical oxidation, concentrated wastewater, printing and dyeing wastewater, current efficiency, energy consumption

中图分类号:

X703

陈安妮,童展梁,姚佳超,孙欢红. 电氧化处理印染行业膜后浓水的研究[J]. 工业水处理, 2021, 41(11): 51-55.

Anni CHEN,Zhanliang TONG,Jiachao YAO,Huanhong SUN. Treatment concentrated wastewater of membrane from dyeing industry by electrochemical oxidation process[J]. Industrial Water Treatment, 2021, 41(11): 51-55.

https://www.iwt.cn/CN/Y2021/V41/I11/51

图/表 6

图1 流速对COD去除率的影响

Fig.1 Effect of flow rate on COD removal efficiency

图2 初始pH对COD去除率的影响

Fig.2 Effect of initial pH on COD removal efficiency

图3 电流密度对COD去除率和电流效率的影响

Fig.3 Effect of current density on COD removal efficiency and current efficiency

图4 氯离子投加量对COD去除率和电流效率的影响

Fig.4 Effect of chloride ion concentration on COD removal efficiency and current efficiency

图5 羟基自由基和活性氯的产生

Fig.5 The generation of hydroxyl radical and active chlorine

表1 电氧化法处理不同实际废水的能效对比

Table 1 Comparison of energy efficiency of electrochemical treatment for different actual wastewater

废水种类	电极材料		操作条件	COD去除率/%	电流效率/%	能耗/（kW·h·kg^-1）
废水种类	阳极	阴极	操作条件	COD去除率/%	电流效率/%	能耗/（kW·h·kg^-1）
焦化废水^〔19〕	Ti/RuO₂	Ti	电流密度100 A/m²，流速50 mL/min，电解2 h	58.8		78.6
化工废水^〔20〕	亚氧化钛	不锈钢	电流密度10 mA/cm²，pH=8.4，电解1.5 h	73.8		260
印染废水^〔21〕	Si/BDD		电流密度60 mA/cm²，pH=10，电解6 h	~60		50.7
垃圾渗滤液^〔22〕	BDD	Ti	电流密度50 mA/cm²，流速6 L/h，pH=5.16，电解6 h	85.5	~30	~59
厕所废水^〔23〕	BDD		电流密度120 mA/cm²，电解4 h	38.1		93.6
制药废水^〔24〕	Fe	Fe	电压40 V，电解1 h	34.2		65.1
印染行业膜后浓水	Ti/PbO₂	Ti	流速100 mL/min，pH=6，电流密度10 mA/cm²，500 mg/L Cl^-，电解2 h	81.3	43.5	36.2

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