基于竖流式一体化反应器实现自养生物脱氮研究

为了更好地实现亚硝化和厌氧氨氧化工艺联合,根据亚硝化和厌氧氨氧化微生物的生长特性设计了一种新型的自养生物脱氮反应器.通过接种亚硝化和厌氧氨氧化微生物,研究了实现该反应器自养生物脱氮的可行性和运行特性.实验结果表明,该单一反应器能够实现亚硝化与厌氧氨氧化菌的分区培养.经过104d的运行,反应器脱氮效能从0.25kg/(m3·d)上升到1.46kg/(m3·d).利用亚硝化曝气尾气和厌氧区产生的氮气实现了亚硝化液的气升回流,进气量(X)与回流量(Y)呈现出Y＝2.8X－37.1的线性关系.回流比由最初的4上升到14,未对厌氧区环境产生影响,厌氧区ORP始终保持在-500mV左右.同时回流液稀释了进水氨氮浓度,缓和了基质对厌氧氨氧化菌的影响.

Achieving biological nitrogen removal by autotrophic process base on the up-flow integrated reactor

The new type of autotrophic nitrogen removal reactor was designed according to the growth characteristics of nitrification and anammox microorganisms in order to achieve a better process of nitrification-anammox. The feasibility and characteristics of autotrophic nitrogen removal were investigated by inoculation of nitrification and anammox sludge in the reactor. The results show that the nitrification and anammox bacteria could be cultured in different area in a single reactor. After the running time of 104d, the nitrogen removal increased from 0.25kg/(m3×d) to 1.46kg/(m3×d) in the reactor. The nitrification liquid was circulated to the bottom of the reactor by using the off-gas in aerobic area and nitrogen gas produced in anaerobic area. The linear relationship between air flow rate (X) and recirculation flow rate (Y) was showed with Y = 2.8X - 37.1. The recycling ratio increased from 4 to 14, and it was no effect on the anaerobic environment in the reactor. It was confirmed by the ORP in the anaerobic area in the reactor, which kept relatively constant (-500mV) during the experiment. In addition, the ammonia nitrogen concentration in the influent decreased due to the recirculation liquid. It relieved the effect of the substrate on the inhibition of anammox bacteria in the reactor.