摘要
Abstract
The wastewater treatment system of a steel plant in northern China has a designed scale of 58,000 t/d,mainly treating membrane system brine and denitrification wastewater from the iron and steel industry.The main process adopts a multi-stage biochemical+ozone process.This ar-ticle introduces the main design parameters of each process unit and analyzes the operational perfor-mance from October 2024 to September 2025.The analysis results show that the average effluent val-ues of chemical oxygen demand(COD<sub>Cr</sub>),ammonia nitrogen,and total phosphorus are 23.5 mg/L,0.66 mg/L,and 0.09 mg/L,respectively,meeting the Class Ⅴ surface water quality standard of the"Environmental Quality Standards for Surface Water,GB 3838-2002".The average effluent total nitrogen value is 10.4 mg/L,meeting the requirements of the"Discharge Standard of Water Pollutants for Iron and Steel Industry,GB 13456-2012".关键词
钢铁废水/高盐/生化处理/臭氧/地表水Ⅴ类标准Key words
iron and steel wastewater/high salinity/biochemical treatment/ozone/Class Ⅴ sur-face water standard分类
资源环境
