Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Removal of Dissolved Humic Acid with Physicochemical Treatment Process

물리화학적 공정에 의한 용존성 Humic Acid의 제거

  • Kim, Jong-Shik (Department of Chemical Engineering, Keimyung University) ;
  • Choi, Joon-Ho (Department of Chemical Engineering, Keimyung University)
  • 김종식 (계명대학교 화학공학과) ;
  • 최준호 (계명대학교 화학공학과)
  • Received : 1999.04.27
  • Accepted : 1999.07.13
  • Published : 1999.08.10

Abstract

This study was conducted for the two purposes; one was removal of dissolved humic acid, the well-known precursor of trihalomethanes (THMs), by physicochemical treatment processes such as ozone oxidation, coagulation and activated carbon adsorption. The other was qualitative identification of by-products in chlorination of the dissolved humic acid. When ozone oxidation was applied to remove the dissolved humic acid, pH was abruptly decreased. It was indicated that humic acid was not perfectly converted to $CO_2$ and $H_2O$, but to low fatty acid. In coagulation process, the coagulant was polyaluminumchloride which was widely used for drinking water treatment in recent years. With the dosage of 160 mg/L, total organic carbon(TOC), $COD_{Cr}$ and color were removed with 23%, 24% and 5% respectively. Color was effectively removed by ozone oxidation process, which was the first order reaction, with the reaction rate constant of $0.067min^{-1}$. In activated carbon adsorption process, preozonation process could remove more effectively the dissolved humic acid than that without preozonation. When the dissolved humic acid and sodium hydrochloride were reacted with 1 mg-NaOCl/mg-TOC, only trihalomethanes were detected.

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References

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