Effect of NH2OH on the short-cut nitrification and nitrogen removal performance of CANON process
FU Kunming1,, JIN Yiran1, LI Hui1, WU Qing2,,, LIU Yongjian2, LI Fei2 1.Sino-Dutch R & D Center for Future Wastewater Treatment Technologies, Key Laboratory of Urban Storm Water System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China 2.Water Design Group Company Limited, Jinan 250000, China
Abstract:As an intermediate product in completely autotrophic nitrogen removal over nitrite (CANON) process, hydroxylamine (NH2OH) may have a great effect on CANON process. A batch experiment was carried out by using a moving-bed biofilm reactor (MBBR) with stable operation to study the effect of NH2OH concentration on the short-cut nitrification and nitrogen removal performance of CANON process. The influent ${\rm{NH}}_4^ + $-N concentration was controlled at 230 mg·L?1, and the concentrations of NH2OH addition were 0, 5, 20, and 80 mg·L?1, respectively. The results showed that the higher the concentration of NH2OH, the more beneficial to the inhibition of nitrite oxidizing bacteria (NOB) in CANON process. When the NH2OH concentration was less than or equal to 20 mg·L?1, the increase of the concentration of NH2OH was beneficial to the increase of ${\rm{NH}}_4^ + $-N degradation rate. When the NH2OH concentration was 20 mg·L?1, the degradation rate of ${\rm{NH}}_4^ + $-N increased by 29.4 %. In the view of the total nitrogen removal effect, the addition of NH2OH could increase the nitrogen removal performance of CANON process, and the concentration of NH2OH addition could be controlled at 5 mg·L?1. Key words:NH2OH/ CANON process/ short-cut nitrification/ nitrogen removal performance/ AOB/ NOB.
图1AOB中${\rm{NH}}_4^ + $-N氧化的过程原理图 Figure1.Pathway of ammonia oxidation in AOB
图3添加80 mg·L?1 NH2OH不添加${\rm{NH}}_4^ + $-N时MBBR中不同指标的变化 Figure3.Variations of indexes in MBBR with hydroxylamine concentration of 80 mg·L?1 and without ammonia
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1.Sino-Dutch R & D Center for Future Wastewater Treatment Technologies, Key Laboratory of Urban Storm Water System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China 2.Water Design Group Company Limited, Jinan 250000, China Received Date: 2021-02-01 Accepted Date: 2021-04-14 Available Online: 2021-06-25 Keywords:NH2OH/ CANON process/ short-cut nitrification/ nitrogen removal performance/ AOB/ NOB Abstract:As an intermediate product in completely autotrophic nitrogen removal over nitrite (CANON) process, hydroxylamine (NH2OH) may have a great effect on CANON process. A batch experiment was carried out by using a moving-bed biofilm reactor (MBBR) with stable operation to study the effect of NH2OH concentration on the short-cut nitrification and nitrogen removal performance of CANON process. The influent ${\rm{NH}}_4^ + $-N concentration was controlled at 230 mg·L?1, and the concentrations of NH2OH addition were 0, 5, 20, and 80 mg·L?1, respectively. The results showed that the higher the concentration of NH2OH, the more beneficial to the inhibition of nitrite oxidizing bacteria (NOB) in CANON process. When the NH2OH concentration was less than or equal to 20 mg·L?1, the increase of the concentration of NH2OH was beneficial to the increase of ${\rm{NH}}_4^ + $-N degradation rate. When the NH2OH concentration was 20 mg·L?1, the degradation rate of ${\rm{NH}}_4^ + $-N increased by 29.4 %. In the view of the total nitrogen removal effect, the addition of NH2OH could increase the nitrogen removal performance of CANON process, and the concentration of NH2OH addition could be controlled at 5 mg·L?1.
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