A<sub>2</sub>N<sub>2</sub>系统反硝化除磷性能的优化及稳定运行

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Abstract

The two-sludge denitrifying phosphorus removal system (A₂N₂) with "anaerobic/nitrification/anoxic/ nitrification" operation mode was used to treat low C/N ratio real domestic wastewater in sequencing batch reactors (SBR). Through the operating condition optimization of A²/O-SBR and N-SBR unit, the system achieved efficient denitrifying phosphorus removal performance with the low carbon source sewage and solved the problem of high NH₄⁺-N in A₂N-SBR process. Experimental results showed that post-aeration was essential to the efficient nutrient removal performance and long-term stable operation of the A₂N₂-SBR. Complete denitrifying phosphorus uptake without aerobic phosphorus uptake at the anoxic stage of the A₂N₂-SBR was disadvantageous to the growth and reproduction of denitrifying phosphorus accumulating organisms (DPAOs). Anaerobic duration of 1.5h in the A²/O-SBR was ensured the complete oxidation of biodegradable COD, and nitrification duration of 5h in the N-SBR provided sufficient time for NH₄⁺-N oxidation. With anaerobic phosphorus release of 1.5h, denitrifying phosphorus uptake of 2h, and aerobic phosphorus uptake of 0.5h in the A²/O-SBR unit, and the first nitrification of 5h and second nitrification of 1h in the N-SBR unit, the average effluent COD, NH₄⁺-N, TN and PO₄^3--P concentrations in the A₂N₂-SBR system was 46.2, 0.82, 13.63 and 0.82mg/L, respectively. Simultaneous nitrogen and phosphorus removal was achieved in the novel A₂N₂-SBR system.

Key words： A₂N₂ two-sludge system sequencing batch reactor (SBR) low C/N value domestic wastewater denitrifying phosphorus removal performance optimization and stable operation

Received: 17 March 2016

PACS:

X703.1

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	Articles by authors
	WANG Mei-xiang
	ZHAO Wei-hua
	WANG Shu-ying
	HUANG Yu
	PAN Cong
	PENG Yong-zhen

Cite this article:

WANG Mei-xiang,ZHAO Wei-hua,WANG Shu-ying等. Denitrifying phosphorus removal performance optimizationand stable operation of A₂N₂ system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(11): 3311-3320.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I11/3311

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