生物反应器填埋场产甲烷规律的模拟研究

Simulative study on methane generation regulation in bioreactor landfill site

生物反应器填埋场是一种新型的垃圾卫生填埋场,可以加速填埋场的稳定及甲烷的产生。通过模拟试验探讨了生物反应器填埋场在不同操作条件下的产甲烷情况及COD、pH值的变化趋势。试验证明较高的回灌频率有助于垃圾降解、产甲烷速率的升高及渗滤液中COD浓度的降低;污泥接种起缓冲作用,使垃圾的降解及产气速率更趋向平稳;甲烷的产生与COD的降低是同步进行的,因此可以通过COD的变化趋势来判断产甲烷情况。研究建立了反映垃圾含水率影响填埋场产甲烷的数学模型,该模型具有简便、直观、准确等优点。

Bioreactor landfill is a new type of landfill, which can accelerate methane generation velocity and landfill stabilization. The generation of methane as well as the change tendency of COD concentration and pH were discussed in this paper on base of the simulative experiment. The finding of the simulative experiments verified that high recirculation rate of leachate could facilitate the degradation of municipal solid waste, the accelerating of methane＇ s generation velocity and the falling of COD concentration. Sludge could stabilize the velocity of methane generation. The generation of methane always occurs simultaneously with the falling of COD concentration, so the generation of methane through the variation of COD concentration and vice versa can be estimated. The study establishes the mathematical model that reflects landfill sites effected by the containing water and has advantages such as simple, convenience, direct-viewing, and accuracy.