FeCl_3絮凝除As效率影响因素的初步研究  

PRELIMINARY STUDY ON THE ARSENIC REMOVAL EFFICIENCY BY FERRIC CHLORIDE

作　　者：邓天天[1] 李义连[2] 陈锴[1,2] 武荣华[1] 梁艳燕[1] 

机构地区：[1]中国地质大学(武汉)研究生院,武汉 430074 [2]中国地质大学(武汉)环境学院,武汉 430074

出　　处：《环境化学》2011年第2期524-529,共6页Environmental Chemistry

基　　金：国家科技部"863"计划(2007AA06Z333)资助

摘　　要：研究了FeCl3与As的含量比、pH值、三种常见无机盐组分对于FeCl3除As效率的影响,以及在厌氧微生物存在条件下,溶液中pH的变化,Fe和As各价态还原转化之间的关系.研究结果表明,在中性条件下,As的去除效率随着FeCl3浓度的增加而提高,FeCl3去除As的最佳pH值为6—9.NO3-和低浓度的SO42-对FeCl3除砷几乎没有影响,而PO43-和高浓度的SO42-则由于与砷形成竞争吸附而严重影响FeCl3除砷的效果.厌氧微生物的存在使得溶液的pH均有不同程度的降低,Fe和As均发生强烈的还原反应,As的还原程度与初始Fe的浓度呈现反比关系.This paper mainly studied the arsenic removal efficiency by ferric chloride over different factors including the arsenic initial concentration,Fe/As,pH,and common inorganic anions.In addition,the change of solution pH and valence of both iron and arsenic with the existence of anaerobic micro-organisms have also been discussed.The results showed that,under the neutral condition,arsenic removal efficiency increased with increasing dose of ferric chloride,and the optimum pH range for arsenic removal was 6—9.Nitrate and low concentrations of sulfate had little impact on the removal efficiency of arsenic,but phosphate and high concentrations of sulfate reduced the arsenic removal efficiency due to competitive adsorption.The presence of anaerobic micro-organisms in the solution lowered the pH.A strong reduction reaction of ferric chloride and arsenic occurred,with an inverse relationship observed between the degree of arsenic reduction and the initial ferric chloride concentration.

关 键 词：FECL3 AS PH 无机盐离子 厌氧微生物 

分 类 号：X703[环境科学与工程—环境工程]