Nitrogen Removal Using ANAMMOX and Denitrification for Treatment of Municipal Sewage
In this study, an Anaerobic Baffled Reactor (ABR) was constructed.The ANAMMOX process was successfully started up using this reactor within 45 days under the following condition: 27℃, pH of 8, HRT of 10 h, and the influent NO2--N/NH4+-N was 1.32.At the stable phase, the average TN removal percentages reached 83％ and the △NH4+-N: △NO2--N: △NO3--N was 1: 1.31: 0.27.In the process of treating municipal sewage, there was inevitably a certain amount of organic carbon in the influent.Organic carbon had no obvious effect on the ANAMMOX process at C/N of 0.5;Nitrogen removal was improved, and the average total nitrogen (TN, including ammonia, nitrite and nitrate nitrogen) removal efficiency of 93％ was obtained at C/N of 1.However, at C/N of 2, the TN removal performance reduced due to the suppression of ANAMMOX by organic carbon;the ANAMMOX bacteria could recover their activity in a short period of time by reducing the influent COD concentration.In this work, the performance of the ANAMMOXdenitrification process in the treatment of municipal sewage was investigated, which proved the suitability of ABR-denitrification reactor in treating municipal sewage with low ammonia nitrogen concentration, with an effluent TN concentration of 7.5 mg· L-1, and the average TN removal percentages reaching 86％.
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