高氨氮垃圾渗滤液SBR法短程深度生物脱氮

以实际垃圾填埋场渗滤液为研究对象,应用SBR系统对该类废水短程生物脱氮的可行性进行研究,重点考察了短程生物脱氮实现、稳定及系统的脱氮性能.结果表明,经过95天的运行,SBR系统成功实现并维持了稳定短程生物脱氮,平均亚硝积累率在92.5%以上.获得了稳定的脱氮性能,NH4+-N,TN平均去除率分别在97.2%和91.7%以上.DO、ORP和pH曲线的特征点能够准确判断硝化和反硝化终点,可作为SBR处理垃圾渗滤液短程生物脱氮过程的控制参数.相对于氨氧化菌,亚硝酸盐氧化菌对FA、FNA更敏感,因此两者协同作用抑制亚硝酸盐氧化菌活性,再辅以过程控制,能够准确判断硝化终点,实现NOB从系统硝化菌群中逐渐被淘洗,AOB成为优势菌种的目标,这是系统长期维持稳定短程生物脱氮的决定因素,FISH检测结果证明了这一点.

Advanced nitrogen removal from landfill leachate with highly concentrated ammonia nitrogen via nitrite in SBR

The treatment of landfill leachate obtained from municipal solid waste (MSW) by using a lab-scale sequencing batch reactor(SBR) was studied.The aim of achieving and stabilizing partial nitrification and denitrification and the characteristics of advanced nitrogen removal were investigated.The experimental results showed that for 95 days running, stable partial nitrification with nitrite accumulation rate above 92.5% was achieved and maintained successfully.The stable biological nitrogen removal via partial nitrification and denitrification was realized and the average removal efficiency of NH^{+_{4 -}}N and TN were above 97.2% and 91.7%, respectively.The DO, ORP and pH could be used as the process control parameters for SBR reactor, because the characteristic points on the profiles indicated exactly the nitrification and denitrification end point.The nitrite oxidizing bacteria (NOB) was more sensitive than ammonia oxidizing bacteria (AOB) to the free ammonia (FA) and free nitrite acid (FNA), so the activity of NOB was inhibited by the synergetic effect of highly concentrated FA and FNA in the SBR nitrification.Furthermore, the key factor of achieving and stabilizing partial nitrification and denitrification for a long time was optimization of nitrifying microbial population by the assistance of process control, which was proved by FISH analysis.