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Overcoming barriers to net-zero emissions in wastewater treatment: insights from a comparative analysis
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PRE
AI
S
王
J
R
Q
C
L
DOI：10.1007/s11783-025-2088-2.png)
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Abstract
En 中文
The wastewater treatment sector contributes to greenhouse gas emissions, thereby exacerbating global warming. Achieving net-zero emissions in wastewater treatment plants (WWTPs) is pivotal to meeting carbon neutrality targets. This study evaluated the carbon footprint (CF) of six representative WWTPs in southern and northern China to elucidate the current status of carbon neutrality. The analysis covered CF composition, offsets achieved through carbon compensatory measures, and the CF seasonal and spatial variations. The average CF per population equivalent of the selected Chinese WWTPs with offsets was 58 kg CO2-eq/PE/yr, representing a 22.8% reduction compared with the pre-offset value. Energy recovery from sludge incineration and reclaimed water reuse emerged as the vital carbon offset strategies for the studied facilities in southern and northern China, respectively. Unlike those in typical European WWTPs, indirect emissions driven by substantial electricity and chemical consumption were the primary CF sources in Chinese plants (> 60%). When pollutants removed were used as the functional unit, peak CF values were observed during summer or autumn. Energy input was determined to be the primary factor influencing the CF. Further CF reductions can be realized through process optimization, energy recovery, and chemical reduction, and other measures. This study provides a valuable reference for formulating targeted mitigation strategies in WWTPs and advancing towards carbon neutrality.
Keywords:
Wastewater treatment plant
Carbon footprint
Seasonal variation
Spatial variation
Low-carbon pathways
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