科研之友
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摘要
Municipal wastewater treatment plants (WWTPs) are notable sources of carbon emission for cities in China. With the policy implementation of carbon peak and carbon neutrality, it is fundamental to investigate carbon emission from WWTPs for their low-carbon operation. Based on the available standards, the carbon emissions from 59 WWTPs in a south-China province in 2021 were calculated. And the influences of treatment capacity, loading rate, treatment process, reduction in oxygen-demanding pollutants and moisture content of dried sludge on carbon emission intensity in different types of WWTPs were analyzed combined with power consumption. Results show that the carbon emission from the studied WWTPs in 2021 ranged from 0.02×104 to 11.98×104 t, of which the emission resulting from electricity consumption (79.7% with the range of 62.6%~98.9%) was the key part. Moreover, the carbon emission intensities of the WWTPs were in the range of 0.168~1.070 kg·m?3 (with an average value of 0.326 kg·m?3), most of which were lower than the corresponding values in other parts of China. Furthermore, SPSS multiple linear regression analysis indicated that carbon emission intensity was found to correlate positively with specific electricity consumption, and loading rate, reduction in oxygen-demanding pollutants and treatment process all significantly affected carbon emission intensities of WWTPs, while treatment capacity and moisture content of dried sludge had insignificant effects on carbon emission intensities. The research result was expected to contribute to the low-carbon operation of WWTPs in the cities of the target province and also provides useful references to the study of WWTPs carbon emission in other parts of China. ? 2023 Science Press.
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