Research And Improvement Study On UASB Technology Treating The Leachate Of Landfill Under Normal Temperature Condition

Ecology health landfill of domestic refuse is one main method in processing the town refuse in our country at present and even from now on the long section of times. Leachate can be produced in large quantity in the degradation of domestic refuse in landfill, the density of BOD, COD and NH3-N of leachate is very high , it can easily pollute the surface water and ground water environment seriously. UASB as an important constituent can removed a great deal of BOD and COD in leachate , and NH3-N was also efficiently removed. It provided the condition for the following processing construction. UASB(Upflow Anaerobic Sludge Blanket) is an essential technology for leachate processing . The leachate temperature must achieve 30 ℃-35 ℃ for achieving the anticipated processing effect, what need to heat up leachate which Increased the equipment investment and the leachate processing operating cost. In order to adapt low temperature characteristic in our country's middle and northeast part the place and leachate processing target, This topic research is extremely essential for guaranteeing the UASB normal operation under the normal temperature and the low temperature condition.Focusing on the defects of long start-up period , low organic loading rate and the obvious temperature influence of UASB (Upflow Anaerobic Sludge Blanket) reactor , the effects of adding PAC(Powdered Activated Charcoal) on the start-up and performance of UASB reactor were studied in this paper . This article takes the experimental water quality which comes from garbage landfill plant in Wuhan city Jiangxia area.The parameters such as start-up period , organic loading rate , organic removing rate , operating stability , characteristics of sludge , temperature in UASB reactor were implored in detail. The mechanisms were also analyzed.The main results are as follows: the start-up period of UASB reactor could be shorten by 1/3 for the adding of PAC with the size of 0.16-0.2 mm. It also improved the organic loading rate and the activity of sludge 60%. The operating stability was also promoted greatly. The temperature is the most important factor to affects processing effect of the UASB reactor to high potency wastewater. The activity of sludge in UASB reactor is extremely sensitive regarding the temperaturechange. The short-term temperature fluctuation is not big regarding the processing effect influence, also it may obtain the quite good processing effect when the operating temperature of the leachate in the UASB reactor surpasses 15°C.