摘要
利用双极膜电渗析(BMED)法从沉淀水合二氧化硅制备过程产生的硫酸钠(Na_(2)SO_(4))废水中以硫酸(H_(2)SO_(4))和氢氧化钠(NaOH)的形式回收SO_(4)^(2-)与Na^(+)。考察了电流密度、循环速率、BMED处理单元数对电压、酸(碱)室pH、SO_(4)^(2-)与Na^(+)回收率、单位能耗和电流效率等的影响,结果表明最佳电流密度、循环速率分别为70 mA·cm^(-2)和80 mL·min^(-1)。在这最佳实验条件下,SO_(4)^(2-)与Na^(+)的回收率分别为94.2%和71.2%,单位能耗分别为3.10和1.80 kW·h·mol^(-1),电流效率分别为52.4%和50.5%。相对于1处理单元,2处理单元能有效降低单位能耗而不影响处理效果。因此,BMED法是一种处理Na_(2)SO_(4)废水的有效方法。
Bipolar membrane electrodialysis(BMED)was used to recover SO_(4)^(2-)and Na^(+)from sodium sulfate(Na_(2)SO_(4))wastewater generated in the preparation process of precipitated hydrated silica.The effects of current density,circulation rate,and number of BMED processing units to wastewater compartment solution on BMED voltage,SO_(4)^(2-)recovery ratio,Na^(+)recovery ratio,specific energy consumption and current efficiency were investigated,and the optimal current density and circulation rate were 70 mA·cm^(-2)and 80 mL·min^(-1),respectively.The recoveries of SO_(4)^(2-)and Na^(+)were 94.2%and 71.2%,respectively.The specific energy consumption was 3.10 and 1.80 kW·h·mol^(-1),the current efficiency was 52.4%and 50.5%,respectively.Compared with 1 processing unit,2 processing units can effectively reduce the unit energy consumption without affecting the treatment effect.Therefore,BMED is an effective method for treating Na_(2)SO_(4)wastewater.
作者
江杰
吕明智
陈日耀
刘耀兴
JIANG Jie;L Mingzhi;CHEN Riyao;LIU Yaoxing(College of Environmental and Resource Sciences,College of Carbon Neutral Modern Industry,Fujian Normal University,Fuzhou Fujian 350117,China;Fujian Key Laboratory of Pollution Control&Resource Reuse,Fuzhou Fujian 350117,China)
出处
《莆田学院学报》
2025年第2期93-101,共9页
Journal of putian University
基金
国家自然科学基金资助项目(21507069)
福建省自然科学基金资助项目(2021J01194)。
关键词
双极膜电渗析
硫酸钠废水
硫酸
氢氧化钠
回收
bipolar membrane electrodialysis
sodium sulfate wastewater
sulphuric acid
sodium hydroxide
recycle
作者简介
江杰(2000-),男,福建龙岩人,2023级硕士研究生,主要从事环境电化学研究;通讯作者:刘耀兴(1983-),男,山东聊城人,教授,博士,主要从事环境电化学和水质污染控制工程领域研究。
