Practice of Groundwater Remediation at a Hexavalent Chromium Contaminated Site in Hunan Province
Taking a hexavalent chromium contaminated site in Hunan Province as an example,this paper introduced the technical route of groundwater remediation.On the basis of introducing the general situa-tion of site pollution,groundwater risk control is implemented for the whole site.After technical compari-son and selection,for the high-pollution area,the source reduction extraction treatment technology was a-dopted,and the groundwater was purified by ferrous sulfate heptahydrate after extraction,which effective-ly reduces the total amount of pollutants in groundwater.For low-polluted areas,in-situ injection remedi-ation technology was used to reduce and stabilize hexavalent chromium by calcium polysulfide agent,and reduce the mobility of hexavalent chromium in groundwater,so as to achieve the purpose of reducing pol-lutant concentration and pollution plume range.Finally,by monitoring the natural attenuation technolo-gy,the natural degradation of pollutants in groundwater in the site is monitored and the degradation abili-ty of groundwater was evaluated,which provided theoretical support for the subsequent site restoration.The combined technology of source reduction extraction-treatment in high-polluted areas,in-situ injection remediation in low-polluted areas and monitoring natural attenuation control technology can provide refer-ence for the engineering design and implementation of similar groundwater remediation projects.
chromium contaminated sitesgroundwaterpump and treat technologyin-situ remediation technologymonitored natural attenuation
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维普
