A/O工艺实现城市污水半亚硝化与生物除磷

Partial nitritation and biological phosphorus removal in A/O process treating municipal wastewater

摘要:

城市污水半亚硝化是实现其厌氧氨氧化的基础和关键步骤,但相关研究甚少,为此,利用A/O反应器处理实际城市污水,研究实现半亚硝化的可行性及其对生物除磷的影响.结果表明:A/O反应器可实现稳定的亚硝酸盐积累,积累率约为85%;通过调整水力停留时间可控制A/O反应器出水NO2--N/NH4+-N在1.0左右,满足厌氧氨氧化对进水水质的要求;温度和溶解氧质量浓度的波动会导致亚硝酸盐积累的破坏.实现半亚硝化的稳定后,A/O反应器除磷稳定性变差,可能与出水游离亚硝酸质量浓度(FNA)增加有关.

Abstract:

Partial nitritation is the basis of anoxic ammonium oxidation(Anammox),however,very limited research has been undertaken on this field.In this study,an A/O reactor was used to investigate the feasibility of the partial nitritation and the performance of biological phosphorus removal from municipal wastewater.The obtained results showed that the partial nitritation could be achieved in A/O reactor with nitrite accumulation rate of 85%.It was possible that nitrite-to-ammonium ratio in the effluent from the A/O reactor was approximately controlled at 1.0 by adjusting hydraulic retention time,which was beneficial to the Anammox reaction.The fluctuation of temperature and DO concentration might lead to the deterioration of nitritation.After the achievement of partial nitritation,the biological phosphorus removal was not stable,which might relate to the increase of FNA concentration in the effluent of A/O reactor,and needed further experimental investigation.