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KMID : 1024520220310010001
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Journal of the Environmental Sciences
2022 Volume.31 No. 1 p.1 ~ p.8
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Optimizing of Coagulation and Solid-Liquid Separation Conditions Using Aluminum Sulfate and Poly-Aluminum Chloride Coagulants
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Lee Chang-Han
Kim Yu-Jin
Moon Sung-Hyun
Kwon Sung-Hun
Ahn Kab-Hwan
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Abstract
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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.
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KEYWORD
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Epoxy-resin, Coagulation, Brine, Separation, Wastewater
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