Zero-emission process method for treating and recycling comprehensive wastewater in iron and steel industry

In view of the problem that the oil content, suspended solid content, salt content and organic matter content of the steel industry wastewater are high, a combined process involving a grid, an oil separation grit chamber, a primary sedimentation tank, a biological contact oxidation tank, an efficient sedimentation tank, a V-shaped filter tank, an ultraviolet disinfection tank, a siphon filter tank, ultrafiltration and two-stage reverse osmosis is adopted, so that pollutants in the wastewater can be effectively degraded, the wastewater reuse rate can be increased, the use amount of new water inthe iron and steel industry is reduced, the investment cost of an enterprise is saved, and remarkable environmental benefits and economic benefits are achieved. 本发明针对钢铁工业废水含油量、悬浮物、含盐量以及有机物含量较高，采用格栅+隔油沉砂池+初沉池+生物接触氧化池+高效沉淀池+V型滤池+紫外消毒池+虹吸滤池+超滤+两级反渗透组合工艺不仅可有效降解废水中污染物，还可提高废水回用率，减少钢铁工业中新水使用量，节约了企业投入成本，具有显著的环境效益和经济效益。