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Characterization of Granular Fertilizer Produced by Fly Ash from a Sewage Sludge Incinerator

하수슬러지 소각 비산재를 이용한 입상비료 조립 및 특성분석

  • Kim, Seong-beom (Department of Environmental Engineering, Kumoh National Institute of Technology) ;
  • Lee, Wontae (Department of Environmental Engineering, Kumoh National Institute of Technology)
  • 김성범 (금오공과대학교 환경공학과) ;
  • 이원태 (금오공과대학교 환경공학과)
  • Received : 2016.03.28
  • Accepted : 2016.10.24
  • Published : 2016.10.31

Abstract

This study assessed feasibility of making granular fertilizer with fly ash from a sewage sludge incinerator in Korea. Composition, characteristics, strength, and heavy metal contents of the granular fertilizers were investigated. Due to its high contents of phosphorus, fly ash from a sewage sludge incinerator could be used to make fertilizers. Granulation rates (2-4 mm granules) over 80% could be achieved as the fly ash contents were 15% or less of the fertilizer. Leaching tests of the fertilizers, based upon the Korean Standard Methods for Solid Wastes, showed the concentrations of heavy metals less than the risk limits. However, contents analysis of the fertilizers, based upon the Korean Standard Methods for Soils, experienced higher levels of heavy metals than the risk limits as the fly ash content exceeded 7% of the fertilizer. Thus, the fly ash needs to be added less than 7% of the fertilizer if there is no pretreatment to remove heavy metals.

Acknowledgement

Supported by : 한국산업단지공단, 환경부, 국가과학기술연구회

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