Leachate Quality Characteristic Property Analysis And Countermeasure

With the country being turned into city quickly,the city scale being extended continuously,the in creasing of people's living level,the yield of the city garbage also raising year by year。Currently Hygiene fill,which can reduce consume caused by the garbage open a heap of put bring of environment problem,is the main means to process garbage,but the garbage hygiene fill also bring the new environment problem that Landfill leachate contaminate surface water,groundwater,and soil surrounding the garbage hygiene fill.Landfill leachate is the dirty water which is produced in heap put and fill cover up process because of fermenting and declining the flush of water,the earth's surface water and ground water's soaking,Landfill leachate is generated as a result of precipitation surface runoff,and infiltration of intrusion of groundwater percolating through a landfill。Leachate contains a large amount of organic matter(both biodegradable carbon and non-biodegradable carbon), ammonia-nitrogen,heavy metals,chlorinated organic and inorganic salts。The leachate production depends on many aspects such as the hydrology of landfill,the soil quality of landfill,the weather and the age of landfill。Since the complex of the leachate there is not perfect technique all over the world till now。The common processes are physical-chemical process and biological treatment process。The physical-chemical process includes coagulation,deposition,adsorption,membrane,advance oxidation and so on。Biological process includes aerobic,anaerobic process and combination of both processes。The physical-chemical process is not affected by the leachate quality and production。It is effective for the non-biodegraded leachate that has a low ratio BOD to CODcr,furthermore many advanced oxidation processes such as photochemical and electrochemical process can improve the leachate biodegradabilityBiological process is effective for the ammonia-nitrogen(NH₃-N)and easy-biodegraded leachate.Furthermore biological process can't lead to second pollution and has low cost。Firstly,the generation principals,the quantity,the influential factors,quality characters and its changing law,the leaching rule of contaminants are studied.Secondly,it analyzes treatment characterstics of the leachate treatment which refer to the main items' changing law,for example:the quality changing largely with the season(solved by building a balancing pond); the quality changing with the age of the landfill(in the different refuse decomposition stage the concentration of COD,BOD₅,NH₃-N,heavy metals are quite different),the complexity of the contaminants(represented by the complex poisonous pollution matter which vary in different areas)。Get UASB+ aerobic biochemical pool +air-stripping+ coagulation + NF technology feasibility。...