Project Analysis And Experimental Study On Aerobic Bioreactor Landfill

There has been a significant increase in municipal solid waste generation during the last few decades and its management has become a major issue because the poor waste management practices affect the health and amenity of the cities.This article researched bioreactor technology in landfill remediation.The main experience is as follows.1.Participate in the aerobic remediation demonstration project of Jinkou Landfill Site in Wuhan by analyzing and calculating the design,operation,effect,investment of the project,explore the technical feasibility and the optimization method.We found once start aeration,in section?and?,the anaerobic reaction was suppressed,methane in extraction gas rapidly reduced to 5%,CO₂ increased to 10%-15%,at the same time,temperature of landfill increased to 50°C gradually.After two months,aerobic reaction slowed down,CO₂in LFG reduced.The temperature also has reached established at room temperature.The piles reached a mean settlements of 13,52 cm,decrease of COD,BOD in LFL by more than85%eventually.After twelve months'operation,performances of the aerobic biological stabilization were remarkable.A total of 25009 t carbon has been discharged.The biodegrading rate was accelerating approximately 14-22 times compared with anaerobic situation.Totally,a reduction of carbon emissions beyond 70%was achieved,equalizing347519.9t CO₂ and 10.43 million CNY based on local carbon trading market,7.73%of the total investment.Therefore,it is necessary to reduce the total investment through carbon transactions in such large-scale landfill aerobic remediation project.Total investment of section A and B of Jinkou landfill is 135 million CNY,the average cost is about 42 CNY/t waste?44 CNY/m³ waste?,less than other domestic projects by 28%.By further comparing with three similar projects:Landfill C,Landfill Kuhstedt,and Australia.We found that increasing the density of air injection wells and air injected rate can effectively enhance aeration rate in actual project.2.Based on the lessons of Jinkou landfill,this paper designs a type of control system which can be used to monitor and adjust gas injection and leachate recirculation,temperature and other parameters.In this system,the parameters can be set manually,the system automatically control the gas injection and leachate recirculation.3.Based on the lessons of Jinkou landfill,High density polyethylene geomembrane connection and grooving process about vertical cut-off wall was explored through pilot site.It is found that the best connection method of 3.0mm membrane is the two-track hot-melt welding,when in room temperature,the best melt parameters are as follow:temperature controlled at 420°C,pressure controlled at 1325N,speed controlled at 1.4min/m.According to the slope depth of different depths in slotting,it can be found that the slope ratio becomes larger as the depth increases,and finally becomes stable.The relationship between the two is close to the formula y=-0.1064x²+1.1621x+0.21,according to which the optimum slope ratio can be rounded to 3.5.As the depth increases,the increase rate of excavation volume is getting faster,and the relationship between the two is close to the formula y=3.9357x²-1.7586x-1.52.It cannot be determined that when the excavation depth continues to increase whether the formula is reliable.Research of this article have a positive effect on solving the methane and leachate pollution caused by large-sized insanity landfill,which is of great significance to the application and development of in-situ aerobic remediation technology.