The Analysis Of The Method Of Dealing With Municipal Waste Leachate

At present, the landfill processing is used to disposal of more than85%of our municipalsolid waste. A large number of landfill leachate that is generated by landfills for municipalsolid wastes had a serious impact on the environment, and once they flowed into theenvironment, they would pollute soil and the groundwater source very seriously. Therefore,the key issue is he search for a set of economic rationality landfill leachate treatment processthat can be applied to promote the landfill technology development and protection of theenvironment. Now, how to dispose landfill leachate effluent effectively and reach thedischarge standards, has become the current urgent issue to be resolved and what process thatmeets the processing requirements still need to conduct some research.The main subject is to study four successfully applied treatment processes of landfills formunicipal solid wastes and to analyze the composition unit and treatment effect of the fourprograms processes.Scheme â…  （UASB+SBR+RO） mainly includes physico-chemical and biochemicalmethod. The results showed that influent COD concentration of20000mg/L of leachate coulddecrease to40mg/L that the water concentration was, its removal efficiency reached99.8%;NH₃-N concentration of12000mg/L decreased to8mg/L that the water concentration was, itsremoval efficiency reached99.8%in experiment with the aid of method.Scheme â…¡ （A²/O+MBR+RO） mainly includes self-developed combination of physicaland chemical and biochemical method. The results showed that influent COD concentrationof20000mg/L leachate could decrease to54mg/L that the water concentration was, itsremoval efficiency reached99.64%; NH₃-N concentration of700mg/L downed to7mg/L thatthe water concentration was, its removal efficiency reached97.86%, the removal efficiencyeven could reach100%in experiment with the aid of method.Scheme â…¢ （MBR+NF） mainly includes chemical and biological membrane method.The results showed that influent COD concentration of20000mg/L leachate could decrease to40mg/L that the water concentration was, its removal efficiency reached99.8%; NH₃-Nconcentration of2100mg/L downed to8mg/L that the water concentration was, its removalefficiency reached99.62%, SS also had a good removal in experiment with the aid of method.Scheme â…£ （two DT-RO） mainly includes the combination of physical and chemicalmethod, The results showed that influent COD concentration that spanned from39000mg/L to65000mg/L leachate could decrease to less than60mg/L that the water concentration was, itsremoval efficiency reached99%; NH₃-N effluent concentrations were less than15mg/L, SS removal rate reached100%in experiment with the aid of method.In this paper, it was revealed by comparison of technical and economic aspects of thefour schemes that the denitrogenate efficiency of Scheme â…  was the maximum. But thestability of the water quality was difficult to maintain, because of the quality and quantity ofeffluent. It was stable that the effluent quality of Scheme â…¡ and â…¢ could reach thestandard of emissions table in the GB16889-2008. Though Scheme â…¢ had a strong shockresistance and load capacity, it was temperature-sensitive, especially in the summer, whichneeded appropriate cooling. At low temperatures, Scheme Ⅱ（A2/O+MBR+RO） had acertain degree of adaptability on the removal of pollutants, whose running costs was18.55/m3.The running costs of Scheme â…£ was34.24/m3. Finally, Scheme â…¡ was chosen as theoptimum process of the landfill leachate treatment station in a city of northwest, whoseoperating parameters of the basic structures were convinced.