Study On Technology For Smelting Wastewater Treatment Of Baotou Iron & Steel Co., Ltd

This thesis analyzes the proprieties of smelting wastewater from Baotou Iron & Steel Co., Ltd. Based on the principles and practices of smelting wastewater treatments, and the discharge standard, a series of experiments were performed, the result including:(1) According the Ecology Environment Development Plan and water quality requirement, the main water quality parameters were established, such as color, COD, SS, petroleum pollutant, Cd and Pb. The effluent goals include: Color<30, SS<10mg/L, petroleum pollutant<3mg/L, COD<50mg/L, Cd<0.05mg/L and Pb<0.1mg/L.(2) The treatment process includes sedimentation, coagulation, flotation and filtration. Based on the experimental results, a best available technology is provided for smelting wastewater treatment.(3) According a series of experiment results, the best available technology for smelting wastewater treatment from Baotou Iron & Steel Co., Ltd could express as:low water- primary settling- coagulationeffluent-filtration-flotation-sedimentationA satisfied removal efficiency of this process could gain, for example: SS<6.3mg/L, petroleum pollutant<0.8mg/L , as well as COD, heavy metal and Color. The operational parameters of treatment process include: Primary settling HRT: 1.5h Surface loading rate: 1.5m3/m3.hMixture time: l.0min Reaction time: 10-15minCoagulant dosage: PFS: PAM=30:0.6mg/LSedimentation HRT: 1-1.5h Flotation Pressure: 1.5kg/cm2Filtration velocity of a anthracite-sand dual filter: 12-18m/h...