Maoshi petrochemical residue hydrodesulfurization unit saves 10 million tons of water annually

The residue hydrodesulfurization unit, with an annual processing capacity of 2 million tons, represents Maoming Petrochemical's largest investment in its refining system. In October and November this year, during full production, the facility used just 14 tons of fresh water per month—less than the daily water consumption of a single household. This remarkable reduction in water usage is a testament to the effectiveness of the water-saving measures implemented. The current water consumption is only 5% of what it was before these initiatives were introduced, placing the unit among the most water-efficient in the country. Strengthening both management practices and technological innovation has been key to achieving significant water savings and emission reductions in the Maoming Refining Division. In 2005, the facility consumed 1.24 tons of fresh water per ton of crude oil. By the first ten months of this year, that figure had dropped to 0.62 tons. With 10.85 million tons of crude processed during the same period, the total fresh water saved exceeded 8 million tons, and wastewater emissions were reduced by more than 5 million tons—equivalent to the volume of a medium-sized reservoir. Previously, due to poor water management and overuse, the company’s fresh water consumption per ton of oil reached as high as 1.29 tons, far exceeding the international standard of 0.5 tons and even surpassing Sinopec’s average of 1.02 tons. This not only led to wasteful use of water resources but also increased operational costs. To address this, the refining division launched a comprehensive water conservation initiative, aiming to reduce fresh water consumption to 0.6 tons per ton of crude oil. Three key strategies were adopted: detailed water management, leak detection and repair, and technical upgrades aimed at reducing water use. These efforts have significantly improved efficiency and sustainability.

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