响应面法优化电化学-铁粉还原法处理高浓度硝酸盐电镀废水工艺

Response surface optimization of treatment process for high-nitrate-concentration electroplating wastewater by combining electrochemical technology with iron powder reduction

[目的]将电化学法和铁粉还原法相结合处理高浓度硝酸盐模拟电镀废水,通过响应面法优化处理工艺。[方法]采用中心复合法设计试验,研究了电压、初始p H、氯离子质量浓度和搅拌强度对硝酸盐去除效率的影响。[结果]在电压为13 V、初始pH为1、极间距为1.2 cm、氯离子质量浓度为3000 mg/L、搅拌强度为450 r/min的条件下电解60 min后,硝酸盐和总氮的去除率分别达到84.04%和81.37%。[结论]采用电化学-铁粉还原法能够有效去除电镀废水中高浓度的硝酸盐。

[Introduction]The process for treating a simulated high-nitrate-concentration electroplating wastewater by combining electrochemical technology with iron powder reduction was optimized by response surface method.[Method]The experiments were carried based on central composite design to study the effects of voltage,initial pH,mass concentration of chloride ions,and stirring rate on the removal efficiency of nitrate.[Result]After electrolysis under the conditions of voltage 13 V,initial pH 1,inter-electrode spacing 1.2 cm,mass concentration of chloride ions 3000 mg/L,and stirring rate 450 r/min for 60 minutes,the removal rate was 84.04%for nitrate and 81.37%for total nitrogen.[Conclusion]The high concentration of nitrate can be effectively removed from the electroplating wastewater by combining electrochemical technology and iron powder reduction.