DO浓度对EBPR耦合SND处理低C/N污水的影响

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Abstract This study focused on investigating the nitrogen (N) and phosphorus removal characteristics of a combined enhanced phosphorus removal (EBPR) with simultaneous nitrification and denitrification (SND) process. An anaerobic/aerobic operated sequencing batch reactor (SBR), fed with actual domestic sewage at a low carbon/nitrogen ratio (C/N, around 3.5), was studied firstly for the start-up of EBPR and the enrichment of phosphorus accumulating organisms (PAOs) by adjusting the influent C/N, and lately for the nutrient removal performance, SND efficiency, and carbon sources conversion by adjusting the dissolved oxygen (DO) concentrations at the aerobic stage. Results showed that at DO concentration of around 2.0mg/L and influent C/N increased from 3.2 to 7.5and then recovered to 3.8, effluent PO₄^3--P concentration gradually decreased from 3.9mg/L to below 0.5mg/L accompanied by the increase of anaerobic phosphorus release amount (PRA) from 3.3mg/L to approximately 30mg/L. Hereafter, when DO concentration gradually decreased to about 1.0mg/L, SND became obvious, and its coupling with EBPR increased the total nitrogen (TN) and PO₄^3--P removal efficiencies to 85% and 94%, respectively. But when the DO concentration was continued decreased to about 0.5mg/L, nitrification became incomplete and nitrite accumulation became obvious, indicating the existence of simultaneous partial nitrification and denitrification. The results indicated that the combined system has the highest nitrogen and phosphorus removal performance at DO concentration of about 1.0mg/L. In addition, when DO concentration decreased from 2.0mg/L to 0.5mg/L, the contribution of PAOs to the storage of anaerobic intracellular carbon sources (P_PAO,An) gradually reduced from 30.3% to 20.2%, resulted in a decrease of PRA for about 7mg/L. DO concentration of 1.0~1.5mg/L was the most conducive to the synthesis of carbon source PHA in the anaerobic stage of the combined system.

Key words： EBPR SND partial nitrification PAOs GAOs

Received: 23 June 2017

PACS:

X703.1

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	Articles by authors
	ZHAO Ji
	WANG Xiao-xia
	LI Xi-yao
	PENG Yong-zhen
	JIA Shu-yuan

Cite this article:

ZHAO Ji,WANG Xiao-xia,LI Xi-yao等. Effect of DO concentration on the combination of EBPR and SND for low C/N sewage treatment[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(1): 120-128.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2018/V38/I1/120

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