Study Of Properties Of White Putty Used As Cover In MSW Iandfill

The basic properties of white putty and soil was studied in this paper, the penetrability of the mixed soil that contains different proportion white putty was mensurated. The removal rates of COD and ammoniac nitrogen dealt by the mixed soil was mensurated primarily through serial-experiment, the effect of PH modulation was also analyzed. According to the result of experiments of the mixed soil penetrability and serial-experiment, The mixed soil that contained 20% white putty was installed in column during drip washing experiments.During drip washing experiments, when hydraulic loading change from 15.92 L/ m2.d to 191.0817 m2.d ,COD loading change from 36.14 g/m2.d to 144.58g/m2.d, The removal rates of COD and ammoniac nitrogem the effect of leachate pH modulation was analyzed.The results show that white putty has a good property of adsorption and can modulation pH. Mixed with soil, white putty can used as overlay in bioreactor landfill. The mixed soil can substitute for soil effectively. The mixed soil which contain different proportion white putty has a good removal effect of COD and NH4-N.When leachate treated by the mixed soil which contained 20% white putty ,the removal rates of COD is above 60% The removal rates of NH4-N is above 90%. The removal rate of COD is affected more by the mixed soil height than that of NH4-N.The higher the concentration of influent COD NH4-N is, the higher the removal rate both COD and NH4-N.The lower hydraulic loading is, the lower the removal rate, because white putty contains much chloride ion and calcium ion, the mixed soil will discharge those ion to leachate.which will result in corrosion scaling of leachate collection pipeline and waste water building. Which should be pay attention to when used in practice.