Impact of large-scale coastal steel industry construction on marine water environment: collaborative prevention and control

Impact of steel production process on marine water environment was evaluated, pollution source analysis and pollution scenarios were identified and described in the present work. Hydrodynamic model of tidal current and solute migration model were established by numerical simulation. Influence of characteristic pollutants (petroleum, COD, inorganic nitrogen, active phosphate and Zn) on marine water environment under normal working conditions was simulated and predicted. Effect of water pollution prevention and control measures were gauged by water environment near sewage outlet before and after project construction. Maximum concentration increment contribution of each characteristic factor was found to be 0.007 mg•L^–1 in inorganic nitrogen concentration. By superimposing current background value, water standard was found not exceeded, inorganic nitrogen content was found to increase by 0.17 mg•L^–1. Deep sea discharge of sewage after deep treatment was found to meet protection requirements of marine water environment. This work could be applied in marine water environmental protection for coastal layout of steel industry.