Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Recovery of Presource from Sewage Sludge by a Struvite-forming Method

Struvite 결정화를 이용한 하수슬러지내의 인 자원 회수에 관한 연구

  • Choi, Won-Joon (Greenhouse Gas Research Center, Korea Institute of Energy Research) ;
  • Park, Kyu-Man (Environmental Instrument Team, Korea Testing Laboratory) ;
  • Yoon, Bae-Geun (Department of Environmental Engineering, Pusan National University) ;
  • Kim, Min-Chul (Office of Environmental Geology, Korea Rural Community & Agriculture Corporation) ;
  • Oh, Kwang-Joong (Department of Environmental Engineering, Pusan National University)
  • 최원준 (한국에너지기술연구원 온실가스연구단) ;
  • 박규만 (한국산업기술시험원 환경기기팀) ;
  • 윤배근 (부산대학교 환경공학과) ;
  • 김민철 (한국농촌공사 환경지질처) ;
  • 오광중 (부산대학교 환경공학과)
  • Received : 2008.11.18
  • Accepted : 2009.07.13
  • Published : 2009.07.31
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Abstract

The objective of this study is to efficiently recover phosphorus contained in sewage sludge by a struvite-forming method. The performances were evaluated under various operating conditions(elution with the kind of acid, Mg-compound and temperature) in order to reach the optimum conditions of struvite-forming. As a result, as an elution solution, the elution efficiency of $H_2SO_4$ was 2.65 times higher than that of HCl. Also, the precipitation efficiency of struvite was the highest (97.4%) in case of using $MgCl_2{\cdot}6H_2O$ as Mg-compounds at $25^{\circ}C$. However, the side reaction by Fe, Al and Zn appeared in process of phosphorus recovery. To solve some problems caused by side reacton, large quantities of co-precipitation materials produced by side reaction were removed by precipitating phosphorus compounds in pH 7. Consequently, the recovery efficiency of phosphorus by a struviteforming method was 82.99%, and purity of the recovered struvite product was high.

본 연구는 struvite 형성 방법을 이용하여 하수슬러지 내에 함유되어 있는 인을 효율적으로 회수하는 것을 목적으로 하였다. 산의 종류에 따른 인 용출 실험결과, HCl에 비하여 $H_2SO_4$가 2.65배 높은 효율을 나타내었으며, Mg 원과 온도에 따른 struvite 생성물의 침전율은 $25^{\circ}C$에서 $MgCl_2{\cdot}6H_2O$를 Mg원으로 사용한 경우에 97.4%로 가장 높게 나타났다. 또한, 인 회수 과정에서 Fe, Al, Zn 등에 의한 부반응이 일어났으며, 이를 해결하기 위하여 pH 7에서 인 화합물의 침전을 유도하여 부반응 공침전 물질을 다량 제거시킬 수 있었다. Struvite 형성 방법을 통한 최종 인 회수율은 82.99%로 순도 높은 struvite 생성물을 회수할 수 있었다.

Keywords

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