Study On Two-stage Aerobic Technology Applied In MSW Landfill Treatment

There are some problems of the MSW anaerobic landfill technology at present such as the difficulty in the selection of the landfill site, the slowness of the degradation process, the long time of the stabilization, the low production rate of LFG, the difficulty in the leachate treatment and so on. Thus a new approach combined aerobic treatment technology with traditional anaerobic landfill technology to the MSW treatment was discussed in this paper, which would achieve to the purpose of making use of landfill site more efficiently, accelerating biodegradation of MSW, enhancing the output and production rate of LFG, accelerating stabilization of landfill, reducing the difficulty of leachate treatment and so on. Two major works were presented in this paper. One was the lab research of aerobic biological pre-treatment on MSW, the other was the technics discussion and the design of simulative experiment device of the "anaerobic-aerobic" bioreactor landfill technology. 1) Lab research of aerobic biological pre-treatment effect The effect of aerobic biological treatment technology applied to pre-treatment was probed in this study on landfill treatment of MSW with high water content and high organic substance concentration, which was expected to provide some gist for its application feasibility. Characteristics of equably mixed MSW were measured before experiment. Some indexes of moisture and volume decrease were measured in the process. The techno-economy effect of the projects with and without pretreatment was evaluated synthetically by means of cost-benefit analysis method. The results showed that the aerobic biological pre-treatment can reduce moisture content and decrease weight and volume, can reduce the concentration of NH3-N in the lixivium so as to reduce the difficulty of leachate treatment. Meanwhile, the economic index of the project with pretreatment excelled that of the one without pretreatment. 2) The technics strategy of "anaerobic-aerobic" bioreactor landfill According to the development trend and research hotspot of sanitary landfill at home and abroad, the "anaerobic-aerobic" bioreactor landfill new technology with less investment and lower running cost was brought forward based on the engineering practice and the problems of traditional sanitary landfill and the integration of landfill technology in existence. The structural characteristic and decontamination mechanism were analyzed and summarized based on referring to a great of literature information. According to the technics strategy, a set of simulation experiment device was designed and processed. Test running of the device was carried out. In this paper, a technics strategy of two-stage aerobic process applied in traditional anaerobic landfill was brought forward, which changed singularity anaerobic treatment style of traditional sanitary landfill.