The Application Of Biological Aerated Filtering Technology On Wastewater Treatment For Reuse In Refinery Factory

Water is a kind of basic nature resource and strategic economic resource.The sustainable utilization of water resources is the vital guarantee for the sustainable development of economy and society. Water resource is the important lifeline for the development of refinery industry as well.Water would be one of the most predominant problems for the development of Chinese petrochemical industry. The sewage from refinery is the first kind of sewage, which is generated during crude oil refining and processing.Its specific characters are of large discharge of stream, high consistency and full of many kinds of pollutants. The recycling of refinery sewage can provide effective support to the environmental and ecological protection, in favor of improving and recovering the gradual recessionary water environment, promoting the sustainable utilization of water resources and the sustainable development of society and economy.In 2009, Dalian West Pacific Petrochemical Co Ltd (Wepec) processed the advanced treatment for the sewage of 350 tons per hour discharged into the sea, which is the national secondary standard of discharge water for the coastal cities.Wepec has reached the goal of utilizing all these recycled water as the recharge water to the circulating water of the whole refinery. The thesis states the existing sewage treatment of Wepec and recycling need on the basis of comparing many technologies of sewage treatment. They took the aerated biological filter with small occupation area and high efficiency as the core of the biological system for the main process route of the advanced treatment, i.e.,effluent in the existing sewage treatment plant→air supporting unit→catalytic oxidation ozone unit→carbonization aerated biological filter unit→nitration aerated biological filter unit→highly active fiber filter unit→chlorine dioxide sterilizing unit→discharging outlet→recharge water of circulating water. After running for a period of time, the standardization evaluation proved that the average clearance of COD reached 95%, and that of ammonia and nitrogen reached 94%, and that of BOD reached 86%.Other technical indicators met the needs of designed indicators as well, and moreover, it has the high resistance capacity to impact.