摘要
针对传统土壤钝化剂对镉固定效果差,在酸雨条件下易重新释放镉造成二次污染的问题,提出一种新型复合改性膨润土钝化剂的制备。首先通过对含镉水溶液进行处理,分析复合改性膨润土对镉离子的吸附-脱附行为。然后对镉污染盆栽土壤进行处理,探究复合改性膨润土对土壤的改良效果。结果表明:经过复合改性膨润土处理的镉污染土壤,内部可被植物利用吸收的离子交换态含量降低,不易被吸收的铁锰氧化结合态、腐殖酸结合态含量增加。在模拟酸雨条件下,2种环境浸出液中镉含量均低于0.2 mg/kg,镉固定效果良好,可改良污染土壤,同时避免二次污染。
In order to solve the problem that the traditional soil passivator has poor cadmium fixation effect and is easy to re-release cadmium under acid rain conditions,resulting in secondary pollution,a new composite modified bentonite passivator preparation was proposed.Firstly,the adsorption-desorption behavior of cadmium ions by composite modified bentonite was analyzed by treating the cadmium-containing aqueous solution.Then,cadmium-contaminated potting soil was treated to explore the effect of composite modified bentonite on soil improvement.The results showed that the content of the ion-exchange state that could be absorbed by plants decreased,and the content of iron-manganese oxidation bound state and humic acid bound state that was not easily absorbed increased.Under simulated acid rain conditions,the cadmium content in the leaching solutions of the two environments was less than 0.2 mg/kg,and the cadmium fixation effect was good,which could improve the polluted soil and avoid secondary pollution.
作者
刘梦薇
白国良
桑盛
周源
LIU Mengwei;BAI Guoliang;SANG Sheng;ZHOU Yuan(CCTEG Ecological Environment Technology Co.,Ltd.,Beijing 100020,China;CCTEG Beijing Academy of Land Renovation and Ecological Restoration Technology Co.,Ltd.,Beijing 100020,China)
出处
《粘接》
2025年第3期123-125,133,共4页
Adhesion
基金
中国煤炭科工集团有限公司科技创新创业资金专项项目(项目编号:2023-TD-ZD004-004)
中国煤炭科工集团有限公司科技创新创业资金专项重点项目(项目编号:2022-2-ZD004)。
关键词
生态修复
改性膨润土
土壤改良
镉固定效果
environmental remediation
modified bentonite
soil improvement
cadmium fixation effect
