钛电絮凝同步去除水中PO_(4)^(3-)和有机磷效能及机理  

Efficiency and Mechanism of Titanium Electrocoagulation for Simultaneous Removal of PO_(4)^(3-)and Organophosphate

作　　者：王祯 郭叶飞 张欣桐 李杰 吕建波 WANG Zhen;GUO Ye-fei;ZHANG Xin-tong;LI Jie;LÜJian-bo(School of Civil Engineering,Yantai University,Yantai 264005,China;School of Economics and Management,Yantai University,Yantai 264005,China)

机构地区：[1]烟台大学土木工程学院,山东烟台264005 [2]烟台大学经济管理学院,山东烟台264005

出　　处：《中国给水排水》2025年第1期93-100,共8页China Water & Wastewater

基　　金：山东省自然科学基金资助项目(ZR2019MEE046)。

摘　　要：在钛电絮凝过程中产生的自由基和活性氯物种对有机磷具有氧化降解作用,可达到同步高效去除无机磷和有机磷的效果。以磷酸二氢钾(PO_(4)^(3-))和2-氨基乙基膦酸(AEP)分别作为无机磷和有机磷的模拟污染物,探究极板间距、电流密度和初始pH对钛电絮凝去除PO43-及AEP的影响,并采用淬灭法证明在钛电絮凝过程中产生的自由基活性物种,包括羟基自由基(·OH)、氯自由基(Cl·)等,进而探究钛电絮凝对模拟水样和实际水样中PO_(4)^(3-)与AEP二元污染物的同步去除效果。结果表明,当初始磷浓度(PO_(4)^(3-)或AEP)为1 mg/L时,钛电絮凝的最优极板间距为0.9 cm、电流密度为10 A/m^(2)、初始pH为6~7、运行时间为1 h,在此条件下对正磷酸盐和AEP的去除率分别可达到86.9%和83.3%。对磷的去除机理主要包括氧化降解、络合吸附和网捕卷扫等。The free radicals and active chlorine species generated during the process of titanium electrocoagulation are capable of oxidizing and degrading organophosphate,and can attain the simultaneous and efficient removal of inorganic phosphate and organophosphate.Employing potassium dihydrogen phosphate(PO_(4)^(3-))and 2-aminoethyl phosphonic acid(AEP)as simulated pollutants of inorganic phosphate and organophosphate,the influences of plate spacing,current density,and initial pH on the removal of PO_(4)^(3-)and AEP through titanium electrocoagulation were investigated.The free radical active species including hydroxyl radical(·OH)and chlorine free radical(Cl·)generated during the electrocoagulation were verified by quenching method,and the performance of titanium electrocoagulation for simultaneous removal of binary pollutants(PO_(4)^(3-)and AEP)in both simulated and real water samples was explored.When the initial phosphate concentration(PO_(4)^(3-)or AEP)was 1 mg/L,the optimal conditions for titanium electrocoagulation were plate spacing of 0.9 cm,current density of 10 A/m^(2),initial pH of 6~7,and running time of 1 h.Under these circumstances,the removal efficiencies of orthophosphate and AEP could reach 86.9%and 83.3%,respectively.The removal mechanism of phosphate mainly encompassed oxidative degradation,chelate adsorption,trapping and sweeping.

关 键 词：钛电絮凝 PO_(4)^(3-) 有机磷 羟基自由基 氯自由基 

分 类 号：TU992[建筑科学—市政工程]