氯化亚铁活化过一硫酸盐同步去除氮磷及磷的回收  

Simultaneous removal of nitrogen and phosphorus by ferrous chloride activated peroxymonosulfate and recovery of phosphorus

作　　者：郭聪慧 李一兵 张娟娟[2] 郝经纬 孙拓 石永 林松 赵旭[2] GUO Conghui;LI Yibing;ZHANG Juanjuan;HAO Jingwei;SUN Tuo;SHI Yong;LIN Song;ZHAO Xu(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;Guizhou Water Affairs Co.Ltd.,Guiyang 550000,China;Guizhou Water Operation Co.Ltd.,Guiyang 550000,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]中国科学院生态环境研究中心,环境水质学国家重点实验室,北京100085 [3]贵州水务股份有限公司,贵阳550000 [4]贵州水务运营有限公司,贵阳550000

出　　处：《环境工程学报》2020年第9期2416-2427,共12页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(21777176);贵州省科技支撑计划项目(黔科合支撑[2019]2848号);观山湖区科技计划项目(观科合同[2018]16号)。

摘　　要：采用氯化亚铁(FeCl2)活化过一硫酸盐(PMS)产生硫酸根自由基(SO4^·-)和氯自由基(Cl·),实现了水中NH4^+、PO43-的同步无害化去除及磷的回收。研究了Fe^2+/PMS/Cr体系中的反应机制,考察了PMS浓度、Fe^2+/Cr、溶液pH、温度、溶液共存CO3^2-浓度及腐殖酸(HA)浓度等条件对反应体系的影响。结果表明:当溶液pH为4.0、PMS投加量为20 mmol·L^-1、Fe^2+/Cl^-摩尔分数为1/12时,反应30 min后,溶液中的NH4+去除率高达100%且以氮气(N2)形式实现NH4+无害化去除;PC4^3-的去除率也高达100%且以磷酸铁(FePO4)沉淀形式被回收;随着PMS浓度、Fe^2+/Cl^-以及温度的升高,Fe^2+/PMS/Cl^-体系中,NH4+去除率逐渐增大,但对PO4^3-的回收无明显影响;溶液中CO32-和HA的存在对NH4+去除有抑制作用。通过自由基淬灭实验和ESR分析证明,SO4^·-和Cl·在Fe^2+/PMS/Cl^-体系中起主要作用。本研究结果可为氮磷废水的处理及磷回收提供参考。This study achieved the simultaneous and harmless removal of NH4 and PO4^3-and the recovery of phosphorus from wastewater by using an approach that exploited ferrous chloride(FeCl2)to activate peroxymonosulfate(PMS)and thereby producing sulfate radicals(SO4^·-)and chlorine radicals(Cl·)to solving the very problem.The mechanism in Fe^2+/PMS/Cl^- system was investigated.The effects of different reaction conditions including PMS dosages,Fe^2+/Cl^- ,pH,temperature,coexistence of CO3^2- and humic acid(HA)concentration on the degradation of PO43-and NH4 were evaluated.The results indicated that the removal efficiency of NH4 reached 100%and NH4 was harmlessly removed in the form of nitrogen(N2).And the removal efficiency of PO4^3-was as high as 100%and was recovered in the form of iron phosphate(FePO4)precipitates at 30 min when the pH of the solution was 4.0,the PMS dosage was 20 mmol·L^-1 and Fe^2+/Cl^-mole fraction was 1/12.In Fe^2+/PMS/Cl^-system,high PMS concentration,high Fe^2+/Cl^-and high temperature,were proved to be favorable in the degradation of NH4^+.However,these conditions had almost null effect on the recovery of PO4^3-.The removal of NH4 was slightly inhibited in the presence of CO3^2- and HA.The radical quenching experiment and ESR results indicated that SO4^·-and Cl·played a major role in Fe^2+/PMS/Cl^-system.This study can provide reference for the treatment of nitrogen and phosphorus wastewater and phosphorus recovery.

关 键 词：过一硫酸盐 氨氮去除 磷回收 氯自由基 硫酸根自由基 

分 类 号：X703[环境科学与工程—环境工程]