Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Optimizing of Coagulation and Solid-Liquid Separation Conditions Using Aluminum Sulfate and Poly-Aluminum Chloride Coagulants from Brine Wastewater Discharged by the Epoxy-resin Process

에폭시수지 공정에서 발생되는 고염 폐수로부터 황산알루미늄과 PAC 응집제를 이용한 응집/고액분리 조건 최적화

  • Received : 2021.06.25
  • Accepted : 2021.12.29
  • Published : 2022.01.31
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Abstract

In this study, solid-liquid separation conditions for coagulation and sedimentation experiments using inorganic coagulant (aluminum sulfate and Poly-Aluminum Chloride (PAC)) were optimized with brine wastewater discharged by the epoxy-resin process. When the turbidity and suspended solid (SS) concentration in raw wastewater were 74 NTU and 4.1 mg/L, respectively, their values decreased the lowest in a coagulant dosage of 135.0 - 270.0 mg Al3+/L. The epoxy resin was re-dispersed in the upper part of wastewater treated above 405.0 mg Al3+/L. The removal efficiencies of turbidity and SS via dosing with aluminum sulfate and PAC were evaluated at initial turbidity and SS of 74 - 630 NTU and 4.1 - 38.5 mg/L, respectively. They increased most in the range from 135.0 - 270.0 mg Al3+/L. The solid-liquid separation condition was quantitatively compared to the correlation of SS removal efficiency between the coagulant dosage and SS concentration based on the concentration of aluminum ions. The empirical formula, R = beaD, shows the relationship between SS removal efficiency (R) and coagulant dosage (D) at 38.5 mg/L; it produced high correlation coefficients (r2) of 0.9871 for aluminum sulfate and 0.9751 for PAC.

Keywords

Acknowledgement

본 논문은 2020년 공정품질기술개발사업(중소기업기술정보진흥원, S2939348)의 재원으로 지원을 받아 수행된 연구사업 지원에 의하여 수행되었습니다.

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