Experimental Research Of The Combined MBR+NF/RO Process In Treatment Of New And Old Mixed Landfill Leachate

Landfill leachate as a secondary pollution accompany with living garbage was mainly comes from rainfall and sewage generated by the degradation of their own garbage, which have complex compositions.with large amounts of toxic and hazardous substances.The water quality and quantity varies obviously as landfill leachate are affected by different factors such as precipitation,landfill ages. Processing is difficult,so the economic and effective treatment measures of landfill leachate became a focus of attention concerned by scholars that come from all over the world.This paper analyzes the aging domestic waste landfill site and the rules of quality and quantity of fresh landfill leachate.According to the latest international research results of landfill leachate processing technology.We selected a garbage landfill leachate of Hefei as a certain reaseach object which mainly adopt the combined process of MBR+NF that plan to process the water 1400 m3/d.The results showed:(1)The reason failed to reach an expected standards at the initial operation when process efffluent.is not realized that there is a transition period exists when the old landfill is closed, and the new landfill put into use, at this period, almost the process object is aging leachate which has a low C/N and poor biodegradability,we should be based on future aging water quality, water quantity change and fresh leachate treatment technology to adjust the dynamic process of the operation parameters and local design changes, to ensure a stable process that can reach the standard; (2) In the transitional period (about 1-2 years),we conducted with a 1:1 quality than in the sink and secondary denitrifying pool dosing glucose test and observed that in the MBR section of COD and TN removal rate can reach 90.88%and 94.96%,;The results show that MBR+NF/RO process technology can reach the standard of "landfill pollution control standards" (GB16889-2008) when adding carbon;(3)The experiment also found the low concentration of MBR sludge running in the biochemical pool (approximately 13816mgMLSS/L),when the MBR biochemical pool of sludge concentration was adjusted to 15000-25000 mgMLSS/L, the system of COD removal efficiency can be increased by about 20%;(4)It is a good time when the second phase of the landfill site in operation for a period of time and fresh leachate production reaches a certain value to mix the aging and fresh leachate have a combinatorial processing.under the condition of withoutincreased investment in equipment and reagents and accompany with the adjustment MLSS of biochemical pool can make the effluent process Meets the requirements of "landfill pollution control standards" (GB16889-2008) table2;the removal rate of conductivitythe system of COD, BODs, NH3-N, TN, TP, and SS of the process were about 99.43%,99.43%,99.35%, 98.24%,89.95%,99.27% and 82.11%, tons of water running cost is 25.30 yuan/ton, reference in the similar domestic landfill leachate treatment.The paper explains the main contents and methods of the research,as well as the final objective of the research,is establishing a referenced practical method for similar landfill leachate process.