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Break Point Chlorination (BPC) Characteristics for Heavy Metals Removal in Plating Wastewater Treatment

한국환경과학회지 2020년 29권 11호 p.1055 ~ 1064
정병길, 이승원, 윤권감, 정진희, 김정웅, 최영익,
소속 상세정보
정병길 ( Jung Byung-Gil ) - Dong-Eui University Department of Environmental Engineering
이승원 ( Lee Seung-Won ) - Dong-Eui University Department of Environmental Engineering
윤권감 ( Yun Kwon-Gam ) - Dong-Eui University Department of Environmental Engineering
정진희 ( Jung Jin-Hee ) - Dong-A University Department of Environmental Engineering
김정웅 ( Kim Jeong-Woong ) - KookJeGiSan Co. Ltd.
최영익 ( Choi Young-Ik ) - Dong-A University Department of Environmental Engineering

Abstract


In this research, heavy metals and T-P removal characteristics of plated wastewater are derived using BPC(Break Point Chlorination) process. AA sedimentation pond outflow(Influence) was evaluated for the removal efficiency of heavy metal(Ni) and T-P at a reaction time of 25 minutes by NaOCl input volume(9, 11, 13 and 15 mL). In the case, the higher the NaOCl input volumes, the higher the ORP values were maintained and the higher the removal efficiency tended to be. On the other hand, T-P was judged to have a low relationship between the ORP value and the removal efficiency. In addition, the efficiency of removal heavy metals and T-P in the plated wastewater by injecting 10 mL, 15 mL, 20 mL and 25 mL NaOCl, increased as the amount of NaOCl injected increased, the amount of NaOH input for pH increased. It was found that suspended solid in effluence also increased. It was also observed that the color of the plating wastewater changed from yellowish green to green to charcoal gray to black as the amount of NaOCl injected increased. Treatment characteristics of the reaction time, the longer the reaction time with the substance to be treated after the input of NaOCl, the more the heavy metal removal efficiency tended to increase. Through XRF analysis of the sludge, the constituents in the sludge such as NaCNO, CNCl, Na3PO4, CrO4, 2Na2CrO4 and 2NaNO3 will be analyzed in detail, and the mechanisms of the reaction between the plated wastewater and the complex compound will be elucidated.

키워드

BPC (Break Point Chlorination); Jar-teat; NaOCl Input Volume; Plating wastewater

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