The purposes of this study were to evaluate the removal characteristics of COD, Ni, and P and to derive appropriate operating conditions for the plating wastewater according to NaOCl reaction time and pH operating conditions in the BPC unit process during the plating wastewater treatment process. As a results of evaluating the removal characteristics for raw wastewater by each BPC unit process, the removal efficiencies of COD, Ni and P in BPC 1-1 unit process were 72.8%, 99.1%, and 100.0%. Therefore, the proper reaction time of NaOCl was derived as 21.1 minutes. In order to maintain the +800 mV ORP and the reaction time of 20 minutes, the temporary injection and continuous injection of NaOCl in the BPC unit process were 13.7 mL and 18.7 mL, respectively. It was found that the temporary injection method of NaOCl reduced the chemical cost by 36.5% compared to the continuous injection method. Also, Ni showed the highest removal efficiency of 97.8% at pH 10.5. On the other hand, P showed a removal efficiency of 57.4% at pH 10.0.

Abstract
1. 서 론
2. 연구방법
    2.1. 실험재료
    2.2. 실험장치 및 방법
3. 결과 및 고찰
    3.1. 현장 BPC 단위공정별 NaOCl 반응시간에 따른 도금폐수의 처리특성
    3.2. NaOCl 반응시간에 따른 도금폐수의 처리특성
    3.3. BPC 단위공정 내 pH 조건에 따른 도금폐수의처리특성
4. 결 론
REFERENCES

• 정병길(동의대학교 환경공학과) | Byung-Gil Jung (Department of Environmental Engineering, Dong-Eui University)
• 이승원(동의대학교 환경공학과) | Seung-Won Lee (Department of Environmental Engineering, Dong-Eui University)
• 윤권감(동의대학교 환경공학과) | Kwon-Gam Yun (Department of Environmental Engineering, Dong-Eui University)
• 최영익(동아대학교 환경공학과) | Young-Ik Choi (Department of Environmental Engineering, Dong-A University) Corresponding author