几种稳定化药剂修复铬污染土壤的研究  

STABILIZATION OF CHROMIUM IN THE CONTAMINATED SOIL BY SEVERAL DIFFERENT CHEMICALS

作　　者：尹贞 廖书林 马强 华建敏 张进锋 李月中 

机构地区：[1]江苏维尔利环保科技股份有限公司,江苏常州213125

出　　处：《环境工程》2016年第5期166-169,共4页Environmental Engineering

摘　　要：采用FeSO_4、K_2HPO_4、EDTA二钠、Na_2S、膨润土、粉煤灰、Ca(OH)_2和水泥8种药剂分别对铬污染土壤进行修复,考察这8种药剂对不同养护时期(7,15,28d)铬污染土壤浸出液中总铬和六价铬的稳定效果,以及对土壤pH值的影响。结果表明,FeSO_4对铬污染的稳定化具有很好的效果,浸出液中总铬和六价铬含量分别降低到2.21,0.76mg/L以下;硫化钠可以使浸出液中总铬和六价铬含量降低50%左右;EDTA二钠对于六价铬有明显的去除作用,但对总铬去除作用不明显。其余几种药剂中,氢氧化钙效果稍微好,其他药剂稳定效果较差。硫酸亚铁和硫化钠对铬土pH影响较大,经过28d修复后也未恢复到原土pH值水平。经过EDTA二钠、氢氧化钙和水泥作用的铬土在第28天的pH值接近原污染铬土壤。其他药剂对土壤pH影响不大。Eight sorts of chemicals,FeSO4,K2HPO4,EDTA disodium,Na_2S,bentonite,fly ash,Ca（ OH）2and cement,were used to restore the soil contaminated by heavy metal chromium. The effect of the eight chemicals on total chromium and Cr（ VI） of the soil extract and p H value of the soil were investigated. Results showed that FeSO4 had a good removal effect on Cr^6＋ and total chromium,and the concentrations of the total chromium and Cr^6＋were reduced to below 2. 21 mg / L and0. 76 mg / L,respectively; Na2S also reduced the concentration of the total chromium and Cr^6＋by about 50%. EDTA disodium had a significant effect on Cr^6＋ while not on total chromium content. Among the other 5 sorts of chemicals,only Ca（ OH）2 had a slight stabilizing effect. The applying of Fe SO4 and Na2S had a great influence on the p H of soil contaminated with chromium. After 28 days,the p H was not restored the initial soil p H. However,p H of the soil that was added with the EDTA disodium,Ca（ OH）2and cement was close to that of the initial soil on the 28 th day. K2HPO4,bentonite and fly ash had no influence on soil p H.

关 键 词：土壤 铬污染 稳定化 效果 稳定剂 

分 类 号：X53[环境科学与工程—环境工程]