污泥-生活垃圾混合填埋体降解产气过程

Gas generation process in sludge-municipal solid waste mixed landfill

通过室内实验研究了不同污泥添加量条件下污泥-生活垃圾混合填埋体的产气过程,并建立了污泥-生活垃圾降解产气过程的动力学模型。研究结果表明,污泥-生活垃圾混合填埋体的产气过程分为三个阶段,即调整阶段、加速阶段和衰减阶段;随着污泥添加量的增加,累计产气量逐渐增大,但是当污泥添加量超过30%后,累计产气量逐渐减少;添加污泥后,产气过程的产甲烷阶段明显提前,并且降解产气中CH_(4)体积分数提高,缩短了填埋场达到稳定所需的时间;但是污泥对混合填埋体的降解速率的促进作用存在一定的范围,本实验中,污泥添加量为30%的混合填埋体的降解速率最快。

The gas production process in sludge-municipal solid waste(MSW)mixture under different sludge addition conditions was studied through laboratory experiments,and a kinetic model of gas production process in the mixture degradation was established.Results show that the gas production process can be divided into three stages:adjustment stage,acceleration stage,and attenuation stage.With the increase in sludge amount,the cumulative gas production gradually increased,but when the sludge amount exceeded 30%,the cumulative gas production gradually decreased.With the addition of sludge,the methane production stage of the gas production process was significantly advanced,and the CH_(4) content in the degradation gas production increased,which shortened the time required for the landfill to stabilize.However,there is a certain range for the amount of sludge that can be added.In the experiments,the mixture with 30%sludge amount exhibited the fastest degradation rate.