电化学沉淀法去除氨氮和总磷效能研究?  

Study on Removal Efficiency of Ammonia Nitrogen and Total Phosphorus by Electrochemical Precipitation Process

作　　者：田宇 陆天友[1] 盛贵尚[1] 姚新梅[1] TIAN Yu;LU Tian-you;SHENG Gui-shang;YAO Xin-mei(College of Civil Engineering,Guizhou University,Guiyang,Guizhou,550025,China)

机构地区：[1]贵州大学土木工程学院,贵州贵阳550025

出　　处：《广州化学》2019年第1期9-15,共7页Guangzhou Chemistry

基　　金：土木工程一流学科(QYNYL[2017]0013);贵州省科技计划项目(黔科合SY字[2014]3045号;黔科合基础[2018]1125号);贵州大学引进人才项目(贵大人基合字[2015]18号)

摘　　要：以氮磷模拟废水为研究对象,以镁板、不锈钢分别作为阳极和阴极构建电化学沉淀反应装置,研究了氮磷比、电流密度、初始pH和Cl-浓度对氨氮和总磷去除效果的影响。实验结果表明:减小氮磷比能增大氨氮去除率,降低总磷去除率;氨氮和总磷去除速率均随电流密度的增加而增大;初始pH为酸性条件时更利于氨氮和总磷的去除;增加Cl-浓度能提高氨氮去除率但对总磷去除效果影响较小。当氮磷比为1∶3、电流密度为40 mA/cm^2、初始pH=3、Cl-浓度为5 000 mg/L,反应时间为20 min时,氨氮和总磷去除率分别达到83.28%和98.38%,对应的能耗分别为21.88 kWh/kg NH_3-N和5.74 kWh/kgTP。电化学沉淀法去除氨氮和总磷主要是通过生成磷酸铵镁和磷酸镁等沉淀物的形式而实现。Electro-precipitation reactor which used magnesium plate and stainless steel plate as anode and cathode was established to treat simulated wastewater involved ammonia nitrogen and phosphorus.Effects of N-P ratio,current density,initial pH and Cl-concentration on removal efficiencies of ammonia nitrogen(NH3-N)and total phosphorus(TP)were investigated.The depression of N-P ratio improved the degradation of NH3-N,but the removal rate of TP was inhibited.Increment of current density was favor of the removal efficiencies of NH3-N and TP.NH3-N and TP could be well degraded in acerbic condition.The increment of Cl-concentration enhanced removal rate of NH3-N,but has little effect on TP s removal rate.When N-P ratio is 1∶3,current density is 40 mA/cm2,initial pH is 3,Cl-concentration is 5 000 mg/L,and reaction time is 20 min,removal rate of NH3-N and TP was 83.28%and 98.38%,respectively.The specific energy consumption was 21.88 kWh/kg NH3-N and 5.74 kWh/kg TP.The formation of magnesium ammonium phosphate and magnesium phosphate was the main reaction path for the degradation of NH3-N and TP.

关 键 词：电化学沉淀 镁阳极 脱氮除磷 磷酸铵镁 

分 类 号：X703.1[环境科学与工程—环境工程]