填埋场原位好氧稳定化技术的应用现状及研究进展

综述了原位好氧稳定化技术的原理、系统构成、关键单元的设计和优化及终点评价，结合我国填埋场及垃圾特点，展望了该技术在我国的发展前景和挑战.均匀布气及配水是原位好氧稳定化项目实施过程中主要的难点.做好渗滤液导排保证堆体最优含水率、优化曝气及提气管道布局、分层整治并辅以高压局部曝气有望提高氧气利用率；采用分层回灌或者压力回灌以及控制回灌速率可分别改善液体回灌过程中的屏障效应和大孔隙出流效应，保障堆体布水均匀.好氧稳定化处理后垃圾腐殖土及场底土壤的风险评价体系及最终出路尚未明确，后期加强相关基础研究以指导工程应用是必要的.

Application status and research progress of in-situ landfill aeration

This paper reviewed the technical principles, system components, the design and optimization of key units, as well as the completion criteria of in-situ landfill aeration. Future development and challenges were prospected in combination with the characteristics of landfill sites and wastes in China. At present, uniform air and water distribution was the major difficulty faced in the implementation of in-situ aeration projects. Oxygen utilization rate could be improved with engineering measures such as the proper leachate collection and distribution to maintain an optimal waste humidity, the optimization of the aeration and extraction pipeline layouts, and the implementation of layer by layer remediation accompanied by high pressure aeration. In addition, the barrier effect and macropore outflow effect during the liquid recirculation could be improved by using stratified or pressurized recirculation, and controlling the recirculation rate, so that an uniform distribution of moisture in landfills may be provided. After aerobic stabilization, the risk assessment system and the final disposal of decomposed wastes and bottom soils were not clearly demonstrated yet, therefore, it was necessary to strengthen the relevant basic research to guide engineering application in future.