填埋场中铁的生物化学循环对反硝化的影响

Effect of microbial redox cycling of iron on denitrification in landfill

在模拟填埋体系中,以填埋场稳定的垃圾为接种物,通过控制有机物和硝氮负荷,研究了铁的生物化学循环对反硝化的影响.结果表明,垃圾填埋场内蕴藏着能实现铁的厌氧氧化还原并同步还原硝氮的复合功能菌群.通过改变有机物和硝氮的负荷,可使得填埋场内持续进行着铁的氧化还原循环和同步氮素转化.从氮素转化产物来看,铁的循环体系中氨氮浓度比传统的反硝化体系低4 mmol·L-1.填埋场内铁的生物化学循环过程对于原位脱氮具有极大贡献.

Effect of microbial redox cycling of iron on denitrification was studied by bath experiments under simulated landfill environment. The aged refuse from real landfill site was used as inoculum and the cultivation condition were controlled by adjusting the load of organic and nitrate, respectively. It is showed that aged landfill refuse contains functional organisms capable of simultaneous Fe（ Ⅱ ） redox cycling and denitrification. Repeated changes in nitrate and organic load can sustain continuous nitrate transformation and Fe（ Ⅱ ） redox cycling. From the viewpoint of nitrogen transformation products, the accumulation of ammonium nitrogen in the group of Fe（ Ⅱ） redox cycling was 4 mmol. L -1 lower than that in the group of traditional denitrification. The microbial redox cycling of iron has significant contribution on the in-situ denitrification in landfill.