HRT对厌氧氨氧化反应器脱氮效能的影响

HRT of Anaerobic Ammonia Oxidation Effect of Biological Denitrification Efficiency

利用UAFB反应器富集培养了厌氧氨氧化细菌,并在此基础上考察水力停留时间(HRT)对厌氧氨氧化系统处理效果的影响。结果表明:HRT对厌氧氨氧化系统影响较大,当HRT为4 h时,系统出水NH4+-N、NO2--N去除率降至65%~60%,出水浓度则分别为15 mg/L、20 mg/L,表明过短HRT会导致含氮污染物去除不完全;HRT为6 h时,系统中NH4+-N去除率均在95%以上,出水NH4+-N≈1 mg/L。系统中NO2--N去除率均在92%以上,出水NO2--N≤5 mg/L;当HRT继续延长至10 h,去除效果无明显变化,出水NH4+-N≈1 mg/L,NO2--N≤5 mg/L,NO3--N平均5.6 mg/L。因此,在该研究中HRT为6 h效果最佳,总氮容积去除负荷为0.57 kg/(m3·d),厌氧氨氧化(ANAMMOX)反应器氨氮去除量、亚硝态氮去除量和硝态氮生成量之比为1∶1.19∶0.39。

Enrichment culture using UAFB reactor for anaerobic ammonia oxidation bacteria,and hydraulic retention time(HRT) anaerobic ammonia oxidation treatment effect of the system. The result show that:HRT too short would lead to nitrogen pollutant removal is not completely, long HRT, sludge may collapse, take HRT for 6 h is reasonable. Effluent: NH4+-N≈1 mg/L, NO2--N≤5 mg/L, average NO3--N 5.6 mg/L. The ratio of NH4+-N removal:NO2--N removal:NO3--N generation in is1∶1.19∶0.39.Volume total nitrogen removal of the load is 0.57 kg/(m3·d). Autotrophic denitrification was achieved by anaerobic ammonia oxidation for existing urban sewage treatment plant process improvement provides a new train of thought and technique.