低温下排水速率对CANON型人工快速渗滤系统稳定性的影响

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Abstract The constructed rapid infiltration (CRI) system with the complete autotrophic nitrogen removal over nitrite (CANON) process, which had been launched at (35±2)℃ and high NH₄⁺-N concentration of (459.98±36.98)mg/L, was used to treat domestic sewage at (10±2)℃. It was conducted to explore the nitrogen transformation mechanisms and the related microbiological characteristics in the CRI system under drainage rate (v_d) constraints. The results showed that the oxygen-limiting microenvironment could be restored and optimized in the CRI system as a result of appropriate v_d. Subsequently, recovery of the CANON process was achieved in the system, as well as its nitrogen removal performance. At the v_d of 0.50L/min, the proliferation and the increased activity of nitrite oxidizing bacteria (NOB) made the nitrification/denitrification process instead of the CANON process became the primary total nitrogen (TN) removal route in the CRI system, resulting the deterioration for nitrogen removal of the system. When the v_d decreased from 0.50 to 0.20L/min, the CANON process could be recovered largely accompanied by the dominance of anaerobic ammonium oxidation bacteria (AnAOB) in the system, and the mean TN and NH₄⁺-N removal rates could reach up to (72.07±5.62)% and (81.51±2.74)%, respectively. However, as the v_d was lower than 0.20L/min, the activity and the quantity of aerobic ammonia-oxidizing bacteria (AOB) was inhibited because of the insufficient of dissolved oxygen (DO) in the bed, thus the reduction of nitrogen removal rate in the CRI system was detected resulting from the unsatisfactory enhancement of the CANON process.

Key words： constructed rapid infiltration (CRI) system completely autotrophic nitrogen removal over nitrite (CANON) anaerobic ammonia oxidation (ANAMMOX) low temperature drainage rate (v_d) nitrogen transformation

Received: 15 June 2021

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X703

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	Articles by authors
	SUN Feng
	YU Xin-jie
	ZHAO Zi-jian
	WANG Ning
	PING La-mei
	WANG Zhen

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SUN Feng,YU Xin-jie,ZHAO Zi-jian等. Effect of drainage rate on the stability of a constructed rapid infiltration system with CANON process at the low temperature[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 183-193.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I1/183

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