Effect of drainage rate on the stability of a constructed rapid infiltration system with CANON process at the low temperature
SUN Feng, YU Xin-jie, ZHAO Zi-jian, WANG Ning, PING La-mei, WANG Zhen
Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
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 (vd) constraints. The results showed that the oxygen-limiting microenvironment could be restored and optimized in the CRI system as a result of appropriate vd. Subsequently, recovery of the CANON process was achieved in the system, as well as its nitrogen removal performance. At the vd 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 vd 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 vd 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.
孙峰, 余昕洁, 赵子健, 王宁, 平腊梅, 王振. 低温下排水速率对CANON型人工快速渗滤系统稳定性的影响[J]. 中国环境科学, 2022, 42(1): 183-193.
SUN Feng, YU Xin-jie, ZHAO Zi-jian, WANG Ning, PING La-mei, WANG Zhen. Effect of drainage rate on the stability of a constructed rapid infiltration system with CANON process at the low temperature. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 183-193.
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