基于短周期调控的SPNPR-A系统脱氮除磷研究

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Abstract In this study, a simultaneous partial nitrification and phosphorus removal-anaerobic ammonia oxidation (SPNPR-A) system with short-cycle and low-concentration nitrite (NO₂^--N) was established. The SPNPR system operates in anaerobic/aerobic mode, and the NO₂^--N concentration in the system was limited for a brief duration to restrict nitrite oxidizing bacteria (NOB), simultaneously enriching ammonia oxidizing bacteria (AOB) and polyphosphate accumulating organisms (PAOs), and finally realizing synchronous nitrogen and phosphorus removal. The results showed that the NOB activity could be effectively inhibited by maintaining the NO₂^--N concentration in the SPNPR system at about 10mg/L for a short-cycle. After 70days, the nitrite accumulation rate (NAR) of the two short-cycles of SPNPR system reached 90.40% and 88.93%, respectively, and the average removal rates of total nitrogen (TN), total phosphorus (TP) and chemical oxygen demand (COD) in SPNPR-A system were 87.45%, 84.30% and 94.26%, respectively. At the 60th day, specific ammonia oxidation rate (SAOR) and specific oxygen utilization rate_AOB(SOUR_AOB) were 8.47mgN/(gMLVSS·h) and 12.71mgO₂/(gMLVSS·h), respectively. Specific nitrate production rate (SNPR) and specific oxygen utilization rate_NOB(SOUR_NOB) were 0.82mgN/(gMLVSS·h) and 0.41mgO₂/(gMLVSS·h), respectively. The results of high-throughput sequencing showed that, the abundance of AOB genera Nitrosomonas (6.46%) and Nitrosospira (0.64%) in SPNPR system was much higher than that of NOB genera Nitrospira (0.14%) and Nitrobacter (0.01%) on the 70th day, and at the same time, the phosphate accumulating organisms of Candidatus_Accumulibacter (1.61%) and Tetrasphaera (0.89%) were gradually enriched, so that the SPNPR-A system underscored the robust performance of synchronous nitrogen and phosphorus removal.

Key words： short-cycle low concentration nitrite partial nitrification nitrogen and phosphorus removal

Received: 04 January 2024

PACS:

X703

Corresponding Authors: 李冬,教授,lidong2006@bjut.edu.cn E-mail: lidong2006@bjut.edu.cn

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	LI Dong
	WANG Qin-yuan
	MAO Zhong-xin
	QI Sai-yue
	ZHANG Jie

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LI Dong,WANG Qin-yuan,MAO Zhong-xin等. Study on nitrogen and phosphorus removal in SPNPR-A system based on short-cycle regulation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4326-4335.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I8/4326

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