Abstract: Wastewater treatment units are important environmental protection facilities for refining enterprises. With the introduction of the “dual carbon” target and related policies, carbon reduction and emission reduction are imperative. Wastewater treatment in a petrochemical company has N₂O direct carbon emission, CH₄ direct carbon emission, fossil fuel combustion direct emission, electricity consumption carbon emission, and material consumption carbon emission. The results of calculation showed that the carbon emission intensity of wastewater treatment in a refining enterprise from fuel gas consumption, material consumption and electricity consumption was 0.899, 0.498 and 0.364 kg/m³, respectively. By adopting measures such as optimizing equipment operation, strengthening water quality control, formulating internal controls and strengthening management, the carbon emission intensity of wastewater treatment was effectively reduced. In 2023, the carbon emission intensity of wastewater treatment in the refining enterprise was 1.103 kg/m³, compared with 2022, it has decreased by 38.65%, and the effect of carbon reduction and emission reduction was obvious. The relevant measures and operating experience are worthy of reference for similar enterprises.

Key words: carbon emission, carbon neutrality, low-carbon operation, wastewater treatment