99% of the total water intake by the Group is from Refineries/Complexes, which use large amounts of water. These facilities not only comply with wastewater standards but also work diligently to reduce water consumption. In the oil refining process, refineries require a significant amount of water, both seawater and freshwater, to cool process fluids. The freshwater, which becomes warm during the cooling process, is circulated through an air-cooled cooler to be cooled and reused, thereby reducing the environmental burden. Approximately 94% of the water taken in by Refineries/Complexes is seawater, with the remaining 6% being industrial water, resulting in a recycling rate of industrial water in fiscal 2023 of 94%.
The Effluent Treatment Plant (ETP) of NSRP, designed with two parallel treatment chains each with a capacity of 235 m3/hour, manages wastewater from process and domestic units. The treatment involves multiple stages including oil separation, bio-treatment, and physiochemical treatment, all operated automatically or semi-automatically. The ETP also treats spent caustic and vent gases, and monitors treated wastewater for various parameters through an online system. Additionally, NSRP engages an authorized monitoring center to periodically check the quality of treated wastewater, ensuring compliance with QCVN 40:2011/BTNMT standards. The Group remains committed to further recycling water resources while maintaining environmental compliance.
