Application of Hydro-cyclone Enhanced Soil Washing Equipment in the Remediation of Heavy Metal Contaminated Soil
In response to the theoretic basis for the design of contaminated soil washing equipment,low screening efficiency,low stirring intensity,and few functional modules,a set of soil washing equipment based on hydro-cyclone classification and reduction,and hydro-cyclone enhanced washing and stripping,suitable for different kinds of polluted soil,has been developed.Through on-site experiments,the sieving precision of the materials remaining on the screens from each screening stage of the washing equipment reach 95%.The removal rates for As(arsenic)and Sb(antimony)can both reach 76%.Compared to the conventional washing equipment,the washing efficiency has been increased by more than 25%under the same conditions.By applying oxidation and air flotation modules,it can effectively remediate complex contaminated soils such as As-aniline,As-benzo(a)pyrene,and As-TPH(Total Petroleum Hydrocarbons)with removal rates all above 70%.The pilot application of this equipment in a heavy metal contaminated site in Shanghai has shown good practical application effects.
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