Partial nitrification-anaerobic ammonia oxidation for the treatment of moderately concentrated ammonia-nitrogen wastewater: Effect of intermittent aeration on nitrogen removal performance
ZHOU Meng-yu, PENG Dang-cong, HAN Yun, Lü Kai
Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Municipal and Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
Abstract：A one-stage PN/A(partial nitrification coupled with anaerobic ammonia oxidation) process was successfully implemented using a lab-scale MBBR reactor with the intermittent aeration. The total nitrogen removal efficiency reached 83.74% under the condition of 35℃, 150.00 mg/L influent ammonia nitrogen, 0.24 kg/(m3·d) influent nitrogen loading rate and(1.41±0.24)mg/L DO concentration. The maximum activity of anaerobic ammonia oxidizing bacteria(AnAOB) and ammonia oxidizing bacteria(AOB) in biofilms were 3792.00 and 5166.00 mg/(m2·d), respectively, while nitrite oxidizing bacteria(NOB) activity was not detected. The results of high throughput analysis showed that the AnAOB was mainly Candidatus Brocadia with a relative abundance of 1.33%,and the dominated AOB and NOB were Nitrosomonas at 0.17% relative abundance and Nitrospira at 0.003% relative abundance,respectively. The efficient PN/A process could be achieved in MBBR reactors at moderate ammonia-nitrogen concentration, and the augmentation of DO concentrations by the intermittent aeration could effectively improve the nitrogen removal performance.
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