PRB曝气强化垂直流人工湿地系统处理垃圾渗滤液

Treatment of Landfill Leachate in Vertical-flow Constructed Wetland System Strengthened by Permeable Reactive Barrier and Aeration

针对垃圾渗滤液污染物种类多、浓度高,采用常规人工湿地系统很难达到预期处理效果等问题,基于可渗透性反应墙(PRB)和空气曝气技术联合垂直流人工湿地系统,构建以无烟煤+钢渣+沸石(1#砂箱)、无烟煤+沸石+钢渣(2#砂箱)及无烟煤(空气曝气)+沸石+钢渣(3#砂箱)的PRB强化垂直流人工湿地处理系统的砂箱,进行动态模拟试验。结果表明:3#砂箱对渗滤液中COD、NH+4-N、PO3-4-P的平均去除率分别为47.55%、98.02%、35.21%,处理效果优于1#砂箱(27.29%、57.31%、29.81%)和2#砂箱(39.90%、96.57%、32.44%)。

To address the problems of various types, high concentration and difficult treatment of pollutants in landfill leachate with conventional constructed wetland system, the sand box models of vertical-flow constructed wetland system strengthened by permeable reactive barrier （PRB） and aeration technique were built to treat landfill leachate dynamically. Among them, Sand Box Model 1 was composed by anthracite, slag and zeolite; Sand Box Model 2 was composed by anthracite, zeolite and slag; and Sand Box Model 3 was composed by anthracite （aeration）, zeolite and slag. The treatment results showed that the average removal rates of COD, NH4^＋ - N and PO4^3-- P in Sand Box Model 3 were 47.55%, 98.02% and 35.21% , respectively, being higher than those in Sand Box Model 1 （27.29%, 57.31% and 29.81% ） and in Sand Box Model 2 （39.90%, 96.57% and 32.44% ）.