渗滤液回灌对其最终处理的影响中试研究

针对2座中试规模反应柱,分别考察渗滤液回灌和不回灌的情况,研究传统厌氧型生物反应器填埋场渗滤液回灌对其最终处理的影响.结果表明:回灌对渗滤液中的有机污染物有很好的去除效果,但对难降解物质以及氮、磷的净化效果不明显.回灌44周后,渗滤液的BOD5去除率达到98.5%,但出流的BOD₅/COD值仅为0.07,BOD₅/TN和BOD₅/TP分别为0.13和11,远低于厌氧条件下微生物生长适值,很难通过传统的生物处理方法净化.在设计生物反应器填埋场时,应该充分考虑到渗滤液经过回灌后组成特性,选择合适的渗滤液处理方案和填埋、回灌方式,充分利用垃圾体的净化作用.

Pilot Scale Research on Impacts of Leachate Recirculation on Its Ultimate Treatment

Two pilot scale simulated columns,with and without leachate recirculation,were erected to study impacts of leachate recirculation of traditional anaerobic bioreactor landfill on leachate ultimate treatment methods.The results indicate that recirculation can remove organic pollutants visibly,but it isn't effective to inbiodegradable components,nitrogen(N) and phosphorus(P) pollutants.After recircualted for 44 weeks,test column has a BOD₅ removal ratio of 98.5%.BOD₅/COD value of outflow is only 0.07.BOD₅/TN and BOD₅/TP are 0.13 and 11 respectively,which are much lower than the adequate value for anaerobic microorganisms.It's difficult to treat this kind of leachate by traditional biological methods.When a bioreactor landfill is being designed,leachate characteristics after recirculated should be well considered and adequate leachate treatment,landfill and recirculation schemes should be chosen to take full advantage of waste stack decontamination effects.