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2024 Vol.29, Issue 1 Preview Page
Leaching and Acute Toxicity Test of Steel-making Slags for Media Contact Recycling

제강슬래그의 매체접촉형 재활용에 따른 중금속 용출특성 및 물벼룩 생태독성 평가

Donghyun Kim1
,
Bong Seok Cho2
,
Won Sik Shin1*
김동현 1
,
조봉석 2
,
신원식 1*
1School of Architecture, Civil, Environmental and Energy Engineering, Kyungpook National University, Daegu 41566, Korea
2Research Institute of Industrial Science & Technology
1경북대학교 건설환경에너지공학부
2(재)포항산업과학연구원
*Corresponding Author
29 February 2024. pp. 72-83
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Abstract

Most of the slags generated from steel-making industry in Korea are recycled into media-contact aggregates such as fill and cover materials. For their use as media-contact aggregates, the slags must meet not only the waste quality criteria, but also the Daphnia magna acute toxicity test criteria. In this study, Korean Leaching Test ES 06150.e (Korea), Japanese Leaching Test JIS K 0058-1(Japan), Detuch Leaching Test DIN 19529 (Germany), Toxicity Characteristic Leaching Procedure (USA) were conducted for batch leaching test of slags from 6 Korean steel-making companies. In addition, Korean Standard up-flow percolation test (ES 06151.1) mimicking field conditions was conducted to assess the impact of the slag leachate on the surrounding environment indirectly. Heavy metals such as Cr 6+ and Zn 2+ were detected from both extractant and leachate samples, but all of them did not exceed waste quality criteria of each country. However, Daphnia magna acute toxicity tests using the leachate samples from up-flow percolation test with slag alone and slag/natural soil conditions exceeded ecotoxicity standard (TU=2) due to their high pH (11.3-12.5). After neutralizing the pH of the slag leachate to 6.5~8.5, the Daphnia magna mortality and immobilization were reduced to satisfy ecotoxicity standard. As the reducing pH of slag leachate would be extremely difficult, appropriate recycling management considering the physicochemical characteristics of he slags should be stuided further.

Keywords
steel-making slag
leaching test
toxicity test
media-contact recycling
References

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Information
  • Publisher :The Korean Society of Soil and Groundwater Environment
  • Publisher(Ko) :한국지하수토양환경학회
  • Journal Title :Journal of Soil and Groundwater Environment
  • Journal Title(Ko) :지하수토양환경
  • Volume : 29
  • No :1
  • Pages :72-83
  • Received Date : 2024-02-02
  • Revised Date : 2024-02-19
  • Accepted Date : 2024-02-26
  • DOI :https://doi.org/10.7857/JSGE.2024.29.1.072
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