江苏某能源石化聚酯一体化循环排污水回用项目工程实例OACSTPCD

The water recycling system for industrial circular wastewater in a certain energy,petrochemical,and polyester integrated facility in Jiangsu Province is designed with a capacity of 1 800 m3/h.The system employs an advanced process flow,including"high-efficiency sedimentation tank+V-type filter tank+aerated biofilter tank+ultrafiltration+reverse osmosis",to ensure water quality to meet standards and achieve efficient recycling.By utilizing the high-efficiency sedimentation tank to remove sludge water,as well as pre-treatment through the aerated biofilter tank(BAF filter tank),V-type filter tank,and ultrafiltration system,the overall system achieves a high recovery rate of 70％.Validation through actual operational data demonstrates satisfactory performance of the system.The chemical oxygen demand(CODCr)removal rate exceeds 70％,while the chloride ion removal rate reaches over 94％.The produced water meets quality standards with mass concentration of CODCr is less than or equal to 20 mg/L,Cl-mass concentration is less than or equal to 50 mg/L,and conductivity is less than or equal to 20 μS/cm;and for the concentrated water,the mass concentration of CODCr is less than or equal to 500 mg/L.In this project,with a high recovery rate and the use of domestically produced ultrafiltration membranes,the direct operational cost of the system is reduced to as low as 6.31 yuan/t.This initiative results in the reduction of approximately 10.584 million tons of external discharged wastewater annually,effectively achieving the goal of reusing wastewater in a circular manner.