摘要
以实际偶氮染料废水为研究对象,采用电氧化法对其进行处理,考察了废水中COD和氨氮同步去除的情况,并分析了该过程中的电流效率和能耗。试验结果表明,在流速150 mL/min,初始pH值6,电极间距1 cm,电流密度20 mA/cm^(2)时,COD和氨氮的去除率分别为75.1%和100%,电流效率为21.2%,能耗为31.6 kWh/m^(3)。在此基础上,提出了一种梯级控制方法,在电解过程中逐步调控电流密度,有利于活性氯的产生,且缓解ClO3-的积累,从而提高电解体系的氧化还原电位(ORP),可实现73.7%的COD去除和100%的氨氮去除,电流效率可提升至27.9%,能耗下降至20.3 kWh/m^(3),达到了35.8%的节能。经梯级控制方法处理后的偶氮染料废水满足《纺织染整工业水污染物排放标准》(GB 4287—2012)。
The electrochemical oxidation was applied to treat actual azo dye wastewater for the simultaneous removal of COD and ammonia,and the current efficiency and energy consumption of the process were analyzed.The results showed that,with the flow rate of 150 mL/min,initial pH value of 6,electrode distance of 1 cm and current density of 10 mA/cm^(2),the removal efficiencies of COD and ammonia could research 75.1%and 100%,current efficiency of 21.2%and energy consumption of 31.6 kWh/m^(3) were obtained.On this basis,a stepping control method was presented according to the variation of current density in electrolysis.This method was conducive to the production of active chlorine and remission of ClO3-accumulation,thereby increasing the oxidation-reduction potential(ORP)of the electrolysis system.73.7%COD and 100%ammonia could be removed,current efficiency increased to 27.9%,and energy consumption decreased to 20.3 kWh/m^(3) with energy saving of 35.8%.The effluent treated by the stepping control method could meet the Discharge Standards of Water Pollutants for Dyeing and Finishing of Textile Industry(GB 4287—2012).
作者
方江民
祁佳怡
黄国龙
姚佳超
Fang Jiangmin;Qi Jiayi;Huang Guolong;Yao Jiachao(College of Biology and Environmental Engineering,Zhejiang Shuren University,Hangzhou310015,China;Zhejiang GenPure Eco-Tech Co.,Ltd.,Hangzhou310020,China)
出处
《山东化工》
CAS
2023年第17期223-226,231,共5页
Shandong Chemical Industry
基金
国家自然科学基金(51878614)
浙江树人学院人才引进启动项目(2019R023)
浙江树人学院2022年浙江省大学生科技创新活动计划(2022R421A019)。
关键词
电氧化
偶氮染料废水
梯级控制
节能
electrochemical oxidation
azo dye wastewater
stepping control
energy saving
