垃圾简易堆填场输氧抽气治理技术试验研究

Experimental Study on the Application of Aerobic Bioreactor in Simple Waste Landfill

为分析垃圾简易填埋场应用输氧抽气治理技术的变化规律,通过在某垃圾简易堆填场开展输氧抽气现场试验和监测,研究技术应用过程中垃圾填埋气体成分与含量变化、垃圾体内温度变化特征,以及垃圾体沉降规律等。结果表明,单井抽气模式下,垃圾填埋气体中氧气含量升高并逐步稳定;其含量接近于环境空气中氧气含量,而甲烷含量急剧降低。系统输氧抽气运行由于新鲜空气输入氧气含量可达20%左右,试验停止后氧气含量逐渐降低;二氧化碳含量逐渐降低,后期由于好氧反应加速,二氧化碳气体含量升高反弹。输氧抽气可加速垃圾体有机质的降解。输氧抽气导致垃圾体温度显著上升,试验区非饱和带垃圾体中部温度升幅较大,可达42~45℃。输氧抽气使垃圾体沉降加速,沉降区域以抽注气井为中心向四周扩展,2个月试验期间,中心区域沉降值达145 mm。

The aerobic bioreactor can accelerate the degradation of organic matter in landfill,and effectively eliminate the pollution source of domestic waste.Through field test in a waste landfill site,the changes of composition and content of landfill gas were analyzed,the characteristics of temperature change caused by aerobic degradation of waste body were analyzed,and the law of the settlement caused by accelerated degradation was analyzed.In the single well pumping mode,the oxygen content in the landfill rises and gradually stabilizes,which is close to the oxygen content in the ambient air,and the methane content decreases sharply.The oxygen content can reach about20%,and the oxygen content gradually decreases after the experiment is stopped.The carbon dioxide content decreases gradually,and the gas content bounces due to aerobic reaction.Aerobic bioreactor result in waste body temperature rise sharply,experimental zone of unsaturated zone heating up to 42~45℃.The subsidence of the landfill was accelerated by oxygen pumping,and the settlement area was extended to the surrounding area by pumping gas well,and the settlement value of the central area was 145 mm during the 2-month experiment.The sedimentation of the waste body was accelerated by oxygen pumping,and the settlement value can reach 145 mm.