[Ammoniac Waste Gas in-situ Treatment Based on ANAMMOX Process]

The feasibility of ammoniac waste gas in-situ treatment by partial nitrification(PN)-anaerobic ammonia oxidation(ANAMMOX) reactor was studied. The PN-ANAMMOX reactor was successfuly started up after 60 d operation in conditions of low dissolved oxygen control(0.2 mg·L^-1), pH 7.9-8.2 and temperature(30-35℃). The total nitrogen removal efficiency reached 88% and the nitrogen removal rate increased from 0.05 kg·(m³·d)^-1 to 0.7 kg·(m³·d)^-1. In the treatment of ammoniac waste gas, the excess oxygen in it would lead to massive growth of nitrifying bacteria, when the ammonia concentration was lower than 2.59%. The ammonia and oxygen in waste gas met the requirement of the reactor for nitrogen removal, when the ammonia concentration stayed between 2.59% and 4.2%. Extra air flow was required for reactor oxygen supplement when the ammonia concentration was higher than 4.2%. The ammonia removal efficiency reached 100%, the total nitrogen removal efficiency reached 90.06%, while the total nitrogen removal rate was 0.51 kg·(m³·d)^-1 after 60 day operation for ammoniac waste gas purification. It is indicated that the integrated reactor based on PN-ANAMMOX process can achieve stable removal of ammonia waste gas.