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.
维普
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