低碳氮比进水AAO污水处理厂低碳运行

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Abstract In order to clarify the carbon emission characteristics of wastewater treatment plants (WWTPs) with low C/N influent and to propose feasible low-carbon operation strategies, seven AAO-based WWTPs (divided into AAO-based WWTPs and AAO-MBR-based WWTPs) were operated for one year, and the carbon emissions based on the emission factor method were calculated and evaluated. In addition, according to the whole process analysis method, the carbon emission reduction pathways of WWTPs with significant low-carbon operation characteristics were subsequently analyzed. The results show that electricity consumption and nitrous oxide emissions are the main sources of carbon emissions, contributing 49.43% and 25.75% of carbon emissions on average, respectively. AAO-MBR-based WWTP is dominated by indirect carbon emissions, and electricity consumption accounts for about 60% of carbon emissions, while the direct carbon emissions caused by the microbial activity in AAO-based WWTP dominate. The average specific carbon emission of AAO-based WWTP was significantly lower than that of the AAO-MBR-based WWTP group (0.47 and 0.79kg CO_2eq/m³), which presents remarkable low-carbon operation potential. Among the seven WWTPs, all the specific carbon emission evaluation indicators of WWTP7are the lowest, indicating that WWTP7has the highest potential for low-carbon operation. Furthermore, the study found that making full use of the influent carbon source, multi-path synergistic nitrogen and phosphorus removal, and precise control of dissolved oxygen to avoid over-aeration are the key points to greatly reduce energy consumption and achieve carbon emission reduction.

Key words： low-carbon-to-nitrogen ratio AAO-based wastewater treatment plant carbon emission characteristics multi-path synergistic nitrogen and phosphorus removal low-carbon operation

Received: 14 April 2022

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X703

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	ZHOU Zheng
	LI Huai-bo
	WANG Yan
	WANG Shuo
	LI Ji

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ZHOU Zheng,LI Huai-bo,WANG Yan等. Research on low-carbon operation mode in AAO-based wastewater treatment plants with low C/N influent[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5088-5099.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I11/5088

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