Study on chracteristics of landfill leachate and its variations

To aim at guiding and controlling landfill leachate treatment system in Guangxi in designing,operating and managing,the chracteristics of landfill leachate and its variations were studied through landfill simulation experiment.The temperature,deposit height of municipal solid waste and water quality of landfill leachate were monitored.The experiment results showed that most of water quality parameters of landfill leachate reached their maximum within 60 d of which CODCr was 22 072 mg/L,BOD5 was 11 065 mg/L,NH3-N was 615 mg/L.The biodegradability of landfill leachate at a later stage of experiment was weakened in which the ratio of BOD5/CODCr was 0.1~0.2 and ratio of C/N was less than 1.Due to the poor biodegradability of landfill leachate,the leachate was difficult to be treated by biochemical treatment and could not reach national standards.The local higher temperatures and conception of rainfall can improve the degradation rate of solid waste and shorten the stabilization time of landfill.