基于树脂富集-电催化还原-膜汽提协同的水中硝氮资源化提取  

Resource extraction of nitrate in water based on resin enrichment-electrocatalytic reduction-membrane stripping synergy system

作　　者：刘亦菲 郭晓彬 程梓绅 江波 LIU Yifei;GUO Xiaobin;CHENG Zikun;JIANG Bo(School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266520,Shangdong,China;Shandong Environmental Protection Science Research and Design Institute Co.,Ltd.,Jinan 250100,Shandong,China)

机构地区：[1]青岛理工大学环境与市政工程学院,山东青岛266520 [2]山东省环境保护科学研究设计院有限公司,山东济南250100

出　　处：《化工进展》2024年第12期7042-7048,共7页Chemical Industry and Engineering Progress

摘　　要：针对低浓度硝氮污染及氮资源化技术需求,本文采用电重构策略合成了泡沫Fe_(2)O_(3-x)催化阴极,构建了高效、低能耗的离子交换工艺-电催化硝氮还原-氨氮汽提回收的耦合反应体系,利用树脂富集低浓度NO_(3)^(-)-N,促进NO_(3)^(-)-N向NH_(4)^(+)-N转化,并利用气体氨的汽提作用,实现水中NO_(3)^(-)-N高效去除和产物氨氮的同步回收。离子交换树脂的富集效应获得的高浓度硝酸盐再生剂用于高效电催化还原产氨,随后利用硝酸根还原反应产生的氢氧根再生阴离子交换树脂,从而在避免投入大量药剂的同时实现了高效的电催化还原。离子交换工艺的引入不仅提升了IE-EC-MC系统电催化还原NO_(3)^(-)的能力,还显著降低了系统能耗。结果表明,电流密度为20mA/cm^(2)时,经处理NO_(3)^(-)-N去除率达98%,氨氮回收率、产氨速率和法拉第效率分别为81%、0.67mg N/(cm^(2)·h)和53%,氨回收能耗仅为19.78kWh/kg(NH_(4))_(2)SO_(4)。本研究为低浓度硝氮污染及氮资源化工艺提供了新思路。In view of the low concentration of nitrate pollution and the technical requirements of nitrogen recycling,the foam Fe_(2)O_(3-x)catalytic cathode was synthesized by the electric reconfiguration strategy,and a coupling reaction system of high-efficiency and low-energy-consumption ion exchange process-electro catalytic nitrate reduction-ammonia nitrogen stripping recovery was constructed.The enrichment effect of the ion exchange resin could obtain a high concentration of nitrate regenerator for efficient electrocatalytic reduction of ammonia,and then the hydroxide generated by the nitrate reduction reaction was used to regenerate the anion exchange resin,thus avoiding the use of a large number of agents while achieving efficient electrocatalytic reduction.The introduction of ion exchange technology improved the electrocatalytic NO_(3)^(-)reduction capability of the IE-EC-MC system,and significantly reduced the energy consumption of the system.The results showed that at a current density of 20mA/cm^(2),the NO_(3)^(-)-N removal rate after treatment reached 98%,and the ammonia nitrogen recovery rate,ammonia production rate,and Faraday efficiency were 81%,0.67mg N/(cm^(2)·h),and 53%,respectively.The energy consumption for ammonia recovery was only 19.78kWh/kg(NH_(4))_(2)SO_(4).This study provided new ideas for low concentration nitrate pollution and nitrogen resource utilization processes.

关 键 词：电化学 离子交换 硝氮还原 低浓度 氨氮回收 

分 类 号：X523[环境科学与工程—环境工程]