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Evaluating the Performance of Blended Fertilizer Draw Solution in Reuse of Sewage Water Using Forward Osmosis

정삼투를 이용한 하수의 재이용에서 혼합비료 유도용액의 성능 평가

  • Kim, Seung-Geon (Department of Chemical and Biological Engineering, Jeju National University) ;
  • Lee, Ho-Won (Department of Chemical and Biological Engineering, Jeju National University)
  • 김승건 (제주대학교 생명화학공학과) ;
  • 이호원 (제주대학교 생명화학공학과)
  • Received : 2019.12.27
  • Accepted : 2020.01.14
  • Published : 2020.02.10

Abstract

This paper aims to reuse sewage by a forward osmosis using a blended fertilizer as a draw solution. This work deals with the primary sedimentation basin influent, effluent, and secondary sedimentation basin effluent from J sewage treatment plant. The average permeate water flux was higher in the order of the blend of KCl and NH4Cl > KCl and NH4H2PO4 > KCl and (NH4)2HPO4, and the reverse solute flux was lower in the order of the blend of KCl and NH4H2PO4 < KCl and NH4Cl < KCl and (NH4)2HPO4. Regardless of the blended fertilizer, the permeate water flux of the effluent from the secondary sedimentation basin was the highest. The blended fertilizer of KCl and NH4H2PO4 was found to be most useful for the reuse of sewage because it contains nitrogen, phosphorus and potassium, which are the major components of a fertilizer, and has a low reverse solute flux. When the blend of KCl and NH4H2PO4 was used as a draw solution, the average permeate water and reverse solute flux for the secondary sedimentation basin effluent were 12.14 L/㎡hr and 0.012 mol/㎡s, respectively.

본 연구는 혼합비료를 유도용액으로 하는 정삼투 기술을 하수에 적용하여 하수를 재이용하기 위한 연구이다. 이를 위하여 본 연구에서는 J 하수처리장의 1차 침전지 유입수와 유출수, 그리고 2차 침전지 유출수를 각각 처리 대상으로 하였다. 평균 수투과선속은 KCl + NH4Cl > KCl + NH4H2PO4 > KCl + (NH4)2HPO4의 순서로 크게 나타났으며, 역용선속은 KCl + NH4H2PO4 < KCl + NH4Cl < KCl + (NH4)2HPO4의 순서로 작게 나타났다. 혼합비료의 종류에 관계없이 2차 침전지 유출수의 수투과선속이 가장 높게 나타났다. KCl과 NH4H2PO4의 혼합 유도용액은 비료의 주요 성분인 질소, 인 및 칼륨을 모두 포함하고 있을 뿐 아니라 낮은 비역용질 선속을 갖고 있어서 하수의 재이용에 가장 유용하게 사용될 수 있을 것으로 판단되었다. KCl과 NH4H2PO4의 혼합 유도용액을 사용한 경우, 2차 침전지 유출수에 대한 평균 수투과선속과 역용질선속은 각각 12.14 LMH과 0.012 mol/㎡s이었다.

Keywords

Acknowledgement

Supported by : 제주대학교

이 논문은 2018학년도 제주대학교 교원성과지원사업에 의하여 연구되었음.

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