Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
권호 표지

Recycling of Waterworks Sludge in Red Clay Bricks Manufacturing

정수슬러지를 이용한 점토벽돌 생산 기술 개발 연구

  • Hwang, Hyeon-Uk (Department of Environmental Engineering, Graduate School, Kyungpook National University) ;
  • Kim, Ji-Hoon (Department of Environmental Engineering, Graduate School, Kyungpook National University) ;
  • Kim, Young-Ju (Department of Environmental Engineering, Graduate School, Kyungpook National University)
  • Received : 2009.01.21
  • Accepted : 2009.03.27
  • Published : 2009.03.31
Download PDF
⟨ Previous Next ⟩

Abstract

This study was conducted to search possibilities of the use of sludge from waterworks industry in the manufacturing of red clay bricks. Different compositions of the sludge were added into the raw materials of the bricks and required engineering characteristics of the manufactured bricks were examined. Compressive strength, plasticity, and surface absorption of the recycled bricks were analyzed and were compared with the bricks quality standard rules and regulation for quality assurance of the product. Compressive strength of the bricks made in a ratio 75% clay, 5% sludge and 20% silica was found 261.3 $kg_f/cm^3$ and that was comparable with first grade bricks standard. Compressive strength of the bricks made in a ratio 70% clay, 10% sludge, and 20% silica was found 249.9 $kg_f/cm^3$ while it was decreased to 217.3 $kg_f/cm^3$ when bricks were made in a ratio 65% clay, 15% sludge and 20% silica. However, these values of compressive strength were in agreement with the bricks quality standard. Surface absorption of the bricks made by the mixing of 20% silica with varying amount of sludge, i.e., 5%, 10%, and 20% was found 10%, 9.65% and 10.92% respectively. These values satisfied the quality standard of bricks of grade 1 and 2. Recycling of proper amount of sludge in bricks making could produce bricks of high engineering characteristics.

본 연구는 정수슬러지를 친환경적인 자원으로 재활용하기 위한 방안으로서 유해성이 없는 점토벽돌 및 보도블록 등으로 재활용하기 위하여 진행되었다. 정수슬러지를 점토벽돌 원료로 대체할 수 있는지에 대한 연구를 수행함에 있어 각각의 원료의 성상을 분석하고 일축압축강도, 흡수율, 중량 및 용출특성을 비교 검토하였다. 그 결과 규사를 20% 고정시킨 후 정수슬러지 5~10%, 점토 70~75% 주입하였을 때 점토벽돌 한국산업규격 품질 1종(압축강도 210.1 $kg_f/cm^2$, 흡수율 10% 이하)에 가장 적합한 결과를 보였으며, 중금속 용출 실험에서도 모든 항목의 농도가 법적 유해물질 용출기준치 이하로 나타났다. 정수슬러지를 이용하여 점토벽돌 제작시 슬러지 5~10%를 주입하여도 시중에서 판매되는 점토벽돌의 품질에 떨어지지 않는다고 사료된다.

Keywords

References

  1. 서울시정개발연구원, “정수슬러지의 처리.처분 연구,” 도시환경연구부, pp. 1-5(1997)
  2. 김승현, “정수슬러지 처리에 관한 연구,” 대한토목학회, 1997(2), 495-498(1997)
  3. 환경부, “2005 전국 폐기물 발생 및 처리 현황,” (2006)
  4. 環境部, “지속가능한 자원순환형 사회’확립을 위한 제2차 국가폐기물관리종합계획(2002-2011),” 환경부, pp. 21-31(2001)
  5. 문성용, “정수 슬러지 발생량 조사 및 슬러지 처리시설의 공정평가,” 상하수도학회, 18(3), 279-290(2004)
  6. 권재현, “정수슬러지의 계절별 탈수성 비교,” 상하수도학회지, 15(1), 58-93(2001)
  7. 임성진, 이재복, “석회처리에 의한 정수슬러지의 복토재활용에 관한 연구,” 상하수도학회지, 14(3), 231-239 (2000)
  8. A.G.N. Othman, “Recycling of spent magnesite and ZAS bricks for the production of new basic refractories,” Ceramics International, 31(8), 1053-1059(2005) https://doi.org/10.1016/j.ceramint.2004.11.004
  9. 이동춘, “폐석분이 유해물질의 고형화 및 안정화에 미치는 영향,” 경북대학교 박사학위논문, pp. 54-65(2007)
  10. 황경진, “폐기 Garnet 미분말의 적벽돌 원료로의 재활용에 관한 연구,” 자원리싸이클링, 11(2), 36-44(2002)
  11. 김영주, “Recycling of calcium fluoride sludge as additive in the solidification-stabilization of fly ash,” SCI, 5, 377-381(2006) https://doi.org/10.1139/S06-003
  12. 임성진, “정수슬러지의 고화처리에서 황토 및 첨가재의 영향에 관한 연구,” 상하수도학회지, 17(6), 802-809(2003)