灌溉水净化系统对水体中Cd去除及对稻米降镉效果研究

【目的】降低灌溉水中的Cd量,降低稻米和土壤中Cd量。【方法】本研究建立了"植物塘+吸附池"为主体的净化模式,研究其对湖南2种典型矿区(工矿污染、煤矿污染)灌溉水Cd污染的净化效果以及降低稻米Cd积累效果。【结果】监测期间,ST试点(工矿污染)进水全量Cd平均质量浓度为6.86μg/L,出水全量Cd平均质量浓度为0.81μg/L,平均去除率为88.19%。DX试点(煤矿污染)进水全量Cd平均质量浓度为4.56μg/L,出水全量Cd平均质量浓度为1.33μg/L。平均去除率为70.76%。经过湿地系统处理后,ST灌溉水净化区糙米中的Cd量较未净化灌溉区的水稻相比降低37%,DX灌溉水净化区糙米中的Cd量较未净化灌溉区的水稻相比降低58%。【结论】本研究建立的"植物塘+吸附池"为主体的净化模式可有效去除污染灌溉水中的Cd,并且降低糙米Cd量。

Relation between Atmospheric Deposition and Accumulation of Heavy Metals in Rice in Mining Areas of Guangxi

Firstly, the concept, sources and damage of atmospheric deposition were introduced, and then the relation between atmospheric deposition and accumulation of heavy metals in rice in Guangxi was analyzed to provide reference for the implementation of effective risk early warning of pollution from heavy metal deposition and safe production of rice in mining areas of Guangxi.