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《Journal of Natural Science of Heilongjiang University》 2013-03
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Soil salinization improved by dewatered sludge associated with physicochemical property changes of heavy metals

MENG Fan-yu1,JIANG Jun-qiu1,ZHAO Qing-liang1,WANG Kun1,WEI Liang-liang1,MA Li2(1.State Key Laboratory of Urban Water Resource and Environment,School Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China;2.Harbin Drainage Limited Liability Company,Harbin 150010,China)  
The effects on the physical and chemical properties of two kinds of improved methods,topsoil mixed and sludge covering,were studied using dewatered sludge as saline-alkali soil ameliorant.The results of field improvement experiment for two years show that with the dewatered sludge usage of 10 kg·m-2,the mixed treatment was much better than the covering treatment;the soil bulk density was effectively reduced by ca 25%;the soil exchange sodium percentage was reduced more than 10%;the soil organic matter content doubled;the nitrogen and phosphorus content in the soil increased.Heavy metal concentrations in soil were below the Soil Environmental Quality Standard(GB15618-1995)(Dry land soil pH 7.5,secondary standard) and existed in residual form.Except the As activity became stronger,the other heavy metals tended to be more stable.
【Fund】: 哈尔滨市科技攻关计划项目(2010AA4CS024)
【CateGory Index】: X703.5
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