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Ammoniac Waste Gas in-situ Treatment Based on ANAMMOX Process

Journal:
Huanjing Kexue


Issue Date:
2017


Abstract(summary):

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 degrees C). The total nitrogen removal efficiency reached 88% and the nitrogen removal rate increased from 0. 05 kg . (m(3) . d) (-1) to 0. 7 kg . (m(3) . 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 . (m(3). 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.


Page:
2947---2952


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