生物反应器填埋场系统渗滤液的脱氮性能

利用填埋场垂直分布的好氧-缺氧-厌氧的独特生态环境，并采用填埋垃圾上层间歇曝气充氧的方式，研究了生物反应器填埋场系统渗滤液的脱N性能.结果表明，填埋垃圾上层间歇曝气充氧,促进了填埋垃圾层硝化细菌和反硝化细菌的生长，且可使反硝化细菌的数量比普通的填埋垃圾层高4～13个数量级，硝化细菌的最大数量可达到10⁹个·g^-1;营建了填埋场内硝化、反硝化等脱N反应的生物环境，有利于回流渗滤液含N化合物的去除.试验结束时,其渗滤液NH₄⁺-N和TN浓度分别为186和289 mg·L^-1，仅为对照的18%和26％.此外，填埋垃圾上层间歇曝气充氧也有利于填埋垃圾的降解，提高垃圾的稳定化效果.

Performance of leachate nitrogen removal in bioreactor landfill system

Utilizing the unique vertical aerobic-anoxic-anerobic ecological enviornment of landfills and adopting intermittent aeration at the top of landfilled refuse, this paper studied the performance of leachate nitrogen removal in the bioreactor landfill system. The results showed that intermittent aeration at the top of landfilled refuse could stimulate the growth of nitrifying and denitrifying bacteria. The population of denitrifying bacteria was 4 to approximately 13 orders of magnitude higher than that in conventional landfilled waste layers, and the maximal value of nitrifying bacteria population reached 10(9) cells g(-1). The bioreactor landfill system with intermittent aeration at the top of landfilled refuse increased the potential of nitrogen removal from re-circulated leachate in the landfill bioreactor. By the end of the experiment, the concentrations of leachate NH4(+) -N and total nitrogen (TN) decreased to 186 mg x L(-1) and 289 mg x L(-1), being only 18% and 26% of control, respectively. Intermittent aeration at the top of landfilled refuse also accelerated refuse decomposition, and increased the degree of waste stabilization.