Changyi Petrochemical’s oil refining units have been shut down for overhaul since July. The company has stepped up environmental protection efforts to ensure zero pollution in the process.
The company asked all parties to ensure no leftover materials in equipment and pipelines before cleaning. Wastewater was discharged at intervals in fixed portion to avoid impact on the wastewater treatment facility. No gas was allowed to be discharged during cleaning, and they were liquefied to protect the surrounding environment. Oil residual and other solid wastes underwent purifying treatment to avoid secondary pollution.