进水C/N对A<sup>2</sup>/O-BCO工艺反硝化除磷特性的影响

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Abstract

A two-sludge system combined anaerobic/anoxic/oxic with biological contact oxidation process (A²/O-BCO) was used to treat domestic wastewater. By adding sodium acetate to adjust influent carbon/nitrogen ratio (C/N=2.44 ~ 8.85), the denitrifying phosphorus removal characteristics of the system were investigated. The results showed that nitrification performance (anoxic denitrifying loading) and poly-β-hydroxyalkanoates (PHA) storage and utilization were mainly influenced by organic matter, which further effected the nitrogen and phosphorus removals. When the influent C/N ratio was 4 ~ 5, COD, TN and PO₄³^--P removals reached to 88%, 80% and 96% respectively, which achieved high-efficiency removal of organic matter, nitrogen and phosphorus simultaneously. The material balance analysis of carbon revealed that COD removal in the A²/O reactor was 71.86% ~ 77.28% of the total COD removal, and COD removal in the BCO reactor only accounted for 2% ~ 12%, where the efficient utilization of carbon source in the A²/O-BCO process was the main reason to achieve deep denitrification and phosphorus removal under the condition of low C/N. In addition, through the correlation analysis of C/N with aeration rate, nitrate recycling ratio and anaerobic/anoxic reaction time, the optimal operation strategy of the A²/O-BCO process was proposed.

Key words： A²/O-BCO C/N denitrifying phosphorus removal domestic wastewater optimal operation

Received: 02 November 2015

PACS:

X703.5

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

Cite this article:

ZHANG Miao,PENG Yong-zhen,ZHANG Jian-hua等. Effect of influent C/N ratios on denitrifying phosphorus removal characteristics in the A²/O-BCO process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(5): 1366-1375.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I5/1366

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