不同反应时间内碳源转化对反硝化除磷的影响

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Abstract

Denitrifying polyphosphate accumulating organisms (DPAOs) could remove N and P simultaneously when exposed to sequential anaerobic-anoxic conditions. The key factor of denitrifying phosphorus removal by DPAOs was the conversion and utilization of internal carbon source. To evaluate the effect of conversion and utilization of internal carbon source on the removal of nitrogen and phosphorus, batch experiments were conducted with different anaerobic/anoxic reaction time using denitrifying phosphorus activated sludge taken from an anaerobic/anoxic/oxic (A²/O)-biological contact oxidation (BCO) system. The results showed that DPAOs produced the highest amount of poly-β-hydroxyalkanoate (PHA) and finished phosphorus release when anaerobic reaction time was 90min, while too long anaerobic reaction time (120, 150min) led to the decrease of PHA and affected denitrifying phosphorus removal. Additionally, the effect of long anaerobic reaction time on phosphorus absorption was more significant than that on denitrification by NO₃^--N, and the specific phosphorus uptake rate suffered a 30 percent fall when extending the anaerobic reaction time to 150min. Under the appropriate anaerobic conditions, the optimal anoxic reaction time for nitrogen and phosphorus removal was 120min. The nitrogen and phosphorus removal couldn't finish with a short reaction time (60min), while Gly was partially degraded with long anoxic reaction time (180, 240, 300min), denitrifying phosphorus removal was indirectly affected, and it was of no advantage to the long-term operation. Furthermore, in a short time, the impact of long anaerobic reaction time on the nitrogen and phosphorus removal was greater than that of long anoxic reaction time.

Key words： denitrifying phosphorus removal anaerobic/anoxic reaction time PHA Gly specific denitrifying phosphorus removal rate

Received: 21 July 2016

PACS:

X703.1

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	Articles by authors
	ZHANG Jian-hua
	WANG Shu-ying
	ZHANG Miao
	WANG Cong
	PENG Yong-zhen

Cite this article:

ZHANG Jian-hua,WANG Shu-ying,ZHANG Miao等. Effect of conversion of internal carbon source on denitrifying phosphorus removal under different reaction time[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(3): 989-997.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I3/989

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