生物反应器填埋场场内脱氮机理小试研究

A preliminary study on the mechanism of nitrogen removal in a laboratory-scale bioreactor landfill

虽然相对于传统的填埋场而言,渗滤液回灌型生物反应器填埋场系统有利于促进填埋层微生物的生长,但并不能促进垃圾有机污染物的彻底厌氧降解,甚至会导致高浓度氨氮的积累而增加场外处理难度;为此,通过实验室动态模拟试验,进行了渗滤液回灌型生物反应器填埋场系统和脱氮型生物反应器填埋场系统对填埋垃圾的脱氮性能及脱氮机理的初步研究.结果表明,脱氮型生物反应器填埋场系统所提供的生物空间环境更有利于反硝化细菌的生长与繁殖,其反硝化细菌的数量始终比常规的渗滤液回灌型生物反应器填埋场系统高1～3个数量级;其氨氮去除效果达到90%左右,远远优于渗滤液回灌型生物反应器填埋场系统.

The characteristics and the mechanism of nitrogen removal in a leachate recirculation biological reactor landfill system as well as in a nitrogen removal bioreactor landfill system have been studied by laboratory simulation experiments. The results that the biological environment provided in the nitrogen removal bioreaetor landfill is more conducive for denitrifying bacteria growth, and propagation where the denitrifying bacteria population is always 1 - 3 orders of magnitude higher than in the leachate recirculation bioreactor landfill. And the NH4^＋ -N removal rate can reach about 90%.