亚硝酸型硝化工艺处理高氨氮渗滤液的试验研究

Nitrous Nitrification for Treatment of High Ammonia Nitrogen Landfill Leachate

以高氨氮垃圾渗滤液为处理对象，通过边进水边曝气的运行方式，同时控制pH≈7、溶解氧在1～2mg／L，在SBR内成功实现了稳定的亚硝酸型硝化。当进水氨氮浓度为2134～2886mg／L、氨氮负荷高达2kgNH3-N／（m3·d）时，出水氨氮和亚硝酸盐氮分别为400和1200mg／L左右，对氨氮的去除率达到80％以上。游离氨（FA）和游离亚硝酸（FNA）对亚硝态氮氧化菌（NOB）的抑制是实现亚硝酸型硝化的关键。另外，系统内高浓度的亚硝酸盐对异养菌的代谢产生了抑制，对TOC的去除率仅为60％左右。

Taking high ammonia nitrogen landfill leachate as treatment object, the stable nitrous nitrification was successfully achieved in SBR operated in simultaneous feeding and aeration mode and with pH of 7 and DO of 1 to 2 mg/L. When the influent ammonia nitrogen concentration and load are 2 134 to 2 886 mg/L and 2 kgNH3 -N/（m3 · d） respectively, the effluent ammonia nitrogen and nitrite nitrogen are 400 mg/L and 1 200 mg/L respectively, and the removal efficiency of ammonia nitrogen is a- bove 80%. The inhibition of free ammonia and free nitrous acid on nitrite oxidizing bacteria is critical for nitrous nitrification, in addition, the metabolism of heterotrophic bacteria is inhibited by high-concentration nitrite in the system, and the removal efficiency of TOC is only about 60%.