Experimental Study On Landfill Leachate Treatment By DAF-BCS-membrane Combination Processes

Landfill leachate form the sewage as a result of water in decomposition of organic matter in waste water and water in garbage, rainfall and infiltration of groundwater by leaching, eroding in the the process of garbage dumps and landfill. At home landfill leachate water is complex, there are high concentrations organic matter and it's ammonia content is high. Quality and quantity fluctuate at the scene of many factors, have a serious environmental pollution to groundwater and surface water environment. The waste treatment process in foreign countries is difficult to be used for reference, there is no mature and perfect treatment of the landfill leachate at present at home.Generation and source, compenent and characteristic, harm and emission standards of urban landfill leachate in China were analyzed, current leachate treatment and the status of the existing problems in China were introduced, current domestic and international basic processing technology were studie, didentify a combination treatment, that is, pre-treatment-biological and chemical treatment-deep treatment three steps treatment.In this combination treatment study, pre-treatment adopt flocculation/flotation technology, biochemical treatment adopt BCS biological treatment, that is improve SBR technology, deep treatment adopt ultrafiltration membrane and reverse osmosis technology. BCS biological treatment technology is an improved treatment technology for high concentration wastewater based on increasing the absorption of ammonia to SBR process with the packing, the ammonia nitrogen removal rate reached 99%. FIL-MAX film is flat ultrafiltration membrane, pretreatment of low demand, high-transmission, prevention of various pollutants plug, easy to clean. Operation results show that the combination had better removal according to COD and NH4-N. The final effluent of the combination treatment:the scope of COD is 0～100 mg/L, mean 18 mg/L, the scope of NH4-N is 0-0.66mg/L, mean0.23 mg/L, this two indicators can satisfy the class-Ⅰstandards for the Pollution Control on the Landfill Site for Domestic Waste (GB16889-1997)...