【Haichuan’s Best Practices】By optimizing the electrodialysis process and increasing the amount of contaminated oil reused in the facility, the output of sludge was reduced by nearly 7,000 tons on a year-on-year basis

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Building on its previous achievements in developing technologies to reduce sludge, Jinxī Petrochemical continues to refine its management practices in order to create a enhanced version that improves quality and efficiency. From March to July 1 this year, the production of sludge decreased by nearly 7,000 tons compared to the previous year; 13,600 tons were reprocessed in the coking units, resulting in cost savings of over 3.5 million yuan in sludge treatment expenses.   Jinxī Petrochemical generates over 30,000 tons of sludge each year during the refining process. The formation of this sludge not only leads to losses of oil products but also incurs high costs in its treatment. To drive the company toward refined management and lean management, Jinxī Petrochemical reduces sludge levels throughout the entire process by optimizing electrodialysis operations and increasing the amount of contaminated oil reused in the production processes.   Jinxī Petrochemical has adjusted the frequency of backwashing the two distillation units from once every 15 days to once every 10 days. At the same time, optimize the operating parameters of electrodesalination, appropriately increase the operation temperature for electrodesalination, and reduce the oil content in the wastewater produced. Each tank area uses methods such as self-circulation, heating, and external circulation to dehydrate the oil inside the tanks, thereby improving the dehydration effect. The Public Utilities Department monitors the oil content in sewer wells on a daily basis, and uses sewage treatment equipment to recover oily waste from these wells.   In addition to reducing the generation of dirty oil at the source, Jinxī Petrochemical also lowers the costs associated with dealing with dirty oil by increasing the amount of such oil that is reprocessed in the coking units. The company stores and processes the wastewater oil from electrodesalination separately from the oil separated in oil separators, controlling the parameters of this oil to ensure it meets the requirements for use in the coking unit. At the same time, improve the incentive measures for handling contaminated oil in relevant positions within the teams, to encourage team members to operate with care and ensure product quality.