常温低氨氮污水生物滤池部分亚硝化的实现

采用火山岩活性生物陶粒滤料反应器,在常温(8～25℃)、低ρ(NH4+-N)(60～90 mg/L)条件下,通过控制曝气,实现了NO2--N的积累,系统启动后NO2--N的累积率大于80%.结果表明:DO控制是实现亚硝化的主要途径,而游离氨(FA)抑制可作为优选氨氧化细菌(AOB)的辅助途径,水力停留时间(HRT)的调整是控制亚硝化比例的主要手段;间歇运行条件下,ρ(NH4+-N)、ρ(NO2--N)和ρ(NO3--N)的变化均具有零级反应动力学特征,且NH4+-N的转化速率为4.32 mg/(L.h),NO2--N与NO3--N的积累速率分别为3.05、0.40 mg/(L.h),根据此规律,将实现部分亚硝化的HRT确定为9～14 h.

Partial Nitrosification in Biofilter for Sewage With Low Ammonia at Room Temperature

A biofilter reactor filled with lava as a carrier is used under the condition of room temperature(8-25 ℃) and low ρ(NH+4-N)(60-90 mg/L).The NO-2-N is accumulated through the method of aeration control in the reactor,and its accumulation rate can reach more than 80% after startup.Results show that DO control is the main approach for realizing nitrosification whereas the restraining of free ammonia can be the assistant method for choosing ammonia oxidization bacteria(AOB),and HRT adjusting is the key way to control the result of ρ(NH+4-N)/ρ(NO-2-N).According to the experiment result,the changes of ρ(NH+4-N),ρ(NO-2-N),and ρ(NO-3-N) all have the dynamics characteristics of zero-grade reaction.Furthermore,the conversion rate of NH+4-N is 4.32 mg/(L·h),and the accumulation rates of NO-2-N and NO-3-N are 3.05 and 0.40 mg/(L·h),respectively.Accordingly,the HRT for partial nitrosification should be controlled from 9 to 14 h.