Technology Research and Application in Heavy Metal Cd Pollution Control in Rivers and Lakes Sediments
With the rapid development of modern industry and agriculture,activities such as mining,smelting and agricultural production have gradually increased,and the heavy metal cadmium(Cd)discharged into the environment has also increased.As a"deposit bank",the problem of cadmium pollution in lake sediments has become increasingly serious.Cd enriched in the sediment of rivers and lakes is easy to be re-released into water body as the environment conditions changed,and can be absorbed and utilized by aquatic organisms,causing harm to human health through the food chain.At present,rivers and lakes present different degrees of Cd pollution in the sediment,and Cd has become one of the most serious heavy metal in sediment,so it is urgent to treat and dispose the sediment with Cd pollution.Therefore,this study summarizes the status of Cd pollution and potential ecological risks in rivers and lakes sediments,so as to describes the development,mechanism and application of in-situ remediation technology for Cd polluted sediment.The technology prospects of Cd polluted sediment is predicted,intending to provide technical reference for the remediation of Cd polluted sediment:(1)It is necessary to study how to systematically analyze the status quo and potential ecological risks of Cd polluted sediment,and to specify the standard value of Cd in different environments;(2)The regeneration and separability of carbon-based adsorbents need to be solved;(3)Pilot experiments and large-scale application are conducive to the study of phytoremediation technology for Cd polluted sediment;(4)The combination of microorganisms and aquatic plants may be an important research direction for remedying Cd polluted sediment in the future.
sedimentheavy metal cadmium(Cd)pollution statuspotential ecological riskcontrol technology phytoremediation
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