Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Fate and Characteristics of Dissolved Organic Matters in a Water Reclamation Facility, Korea

하수처리수 재이용시설의 공정별 용존유기물질 거동 및 특성

  • Kwon, Eun-Kwang (Department of Environmental Engineering, Kumoh National Institute of Technology) ;
  • Lee, Wontae (Department of Environmental Engineering, Kumoh National Institute of Technology)
  • 권은광 (금오공과대학교 환경공학과) ;
  • 이원태 (금오공과대학교 환경공학과)
  • Received : 2021.08.31
  • Accepted : 2021.09.28
  • Published : 2021.09.30
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Abstract

This study investigated the fate of dissolved organic matter (DOM) in a water reclamation facility (WRF) in Korea. The WRF consists of coagulation, sedimentation, microfiltration, and reverse osmosis (RO) components. The production capacity of WRF is 90,000 m3/day. The reclaimed water is reused as industrial water. We also characterized DOM in raw, processed, and finished waters based on analysis of dissolved organic carbon (DOC), ultraviolet absorbance at 254 nm (UVA254), fluorescence excitation emission matrix (FEEM), and DOC fractions via liquid chromatography-organic carbon detection (LC-OCD). Based on the results of DOC, UVA254, and FEEM analyses, neither the coagulation/sedimentation nor the microfiltration at the WRF effectively removed DOM. The RO process removed more than 94% of DOM. The raw water (i.e., secondary treated effluent obtained from a wastewater treatment plant) exhibited tryptophan-like peaks, which are a promising marker of wastewater, in the FEEM analysis. Coagulation and microfiltration failed to eliminate the wastewater marker, whereas RO completely removed it. The raw water also carried high levels (89.4%) of hydrophilic and low-molecular weight substances, which are difficult to remove via coagulation-sedimentation or microfiltration. Humic substance was a major component of the hydrophilic fractions. Based on the LC-OCD analysis, RO effectively removed the humic and polymeric materials from DOM.

Keywords

Acknowledgement

이 연구는 금오공과대학교 학술연구비로 지원되었습니다(2020-021-100).

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