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Green & Clean POSCO

Green & Clean POSCO. W ater Treatment Management FOR Sustainable Industry. 11.23 Hyo Seon Kim. Backgrounds. Stable water supply for long term strategy Strengthening of wastewater regulation Increased needs for process water by expansion of steel production facility. Water Balance.

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Green & Clean POSCO

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  1. Green & Clean POSCO WaterTreatment Management FOR Sustainable Industry 11.23 Hyo Seon Kim

  2. Backgrounds • Stable water supply for long term strategy • Strengthening of wastewater regulation • Increased needs for process water by expansion of steel production facility

  3. Water Balance Recycling Evaporation Ground Water 1st Wastewater Treatment (end of each process) Process (Coke making, Steel making, Cold Rolling etc) Process Water Production Dam Water Reuse Recirculation (98%) Reuse Reuse 2nd(Final) Waste- water Treatment Sewage, Rain water, Indirect Cooling Water Treatment Discharge Discharge

  4. M M M Water Supply System Reservoir Mixing tank Settling Basin Ground water Water Supply River Water Water Supply Reused Water Sand Filter * Suspended solids are removed by coagulant addition and precipitated in the settling basin. * The treated water is transported to each process unit

  5. Water Supply and Quality • Water supply • Water quality

  6. Wastewater Treatment Advanced WWT Process 1st WWT Final WWT Iron & Steel Section WWT Phenol, CN Coke BET A/C Adsorption Hyungsan River NH4, zinc, CN BF Biol. Ammonia Treatment NH4, SS FINEX F C/C SS, Oil Wire Rolling Section WWT Acid, Oil, Metal Cold Rolling Biol. Denitrification F, Metal STS Nang River Acid, Oil, Metal Electric SS, Oil Plate SS, Oil Hot Rolling

  7. Wastewater Facilities final WWT of Pohang Denitrification WWT in STS Activated carbon facility

  8. Wastewater Effluent • Quality * Seongang - Upstream process including BF * Apyeon – Down process including cold rolling mill

  9. Rain Water Treatment Constructing Site Storage Pond Rain Water Treatment Collecting Basin Reuse Water Way Dscharge Hyungsan River Rain Water Reuse

  10. Rain Water Treatment • Quality • Rain water reuse (Unit : ㎥/day)

  11. Sewage Treatment System Relay Pit Biological Sewage Treatment Sewage Sources Pit (Car) Reuse Pit (Pumping) - Toilets, Bathrooms, - Restaurants, Laundry * Sewage from over 600 sites containing bathroom, restaurant, laundry is collected through car and pumping into the relay pit and is transferred to the this facility.

  12. Road Spray Others Mixing to Process Water Slag Qquenching Internal Supply Application of Reused Water * We are establishing strategic plan for maximizing water reuse and minimizing discharge such as re-evaluation of water quality standards for each process, increase of recycling ratio in cooling water system, and installation of reserve osmosis and so on.

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