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A Feasibility Study on the Utilization of by-Product Sludge Generated from Waste Concrete Recycling Process

폐 콘크리트 재생순환자원 부산물 슬러지의 활용 기초연구

  • Received : 2016.03.29
  • Accepted : 2016.05.19
  • Published : 2016.06.30

Abstract

The characteristics analysis and pH neutralization test were carried out to use of slurry generated from recycling processes of construction wastes. D (5.0) of raw sludge was $42.4{\mu}m$ and over 60 % of sludge distribute under 45 um (-325 mesh). Muscovite and carbonate minerals were main minerals of fine particles, and the portion of carbonate minerals increased as particle size decreased. Although the more heavy metals were observed in the finer particle size, the contents was found to be less than Korean contaminated soil regulation (area 2). The effects of flocculants addition for accelerating solid-liquid separation were negligible because the slurry already contains excess of coagulant added in the waste concrete recycling process. It was difficult to neutralize the sludge supernatant due to high pH (about 12) by adding acids, but the introduction of $CO_2$ decreased the pH to 8.5, The precipitate recovered during $CO_2$ introduction was determined to be $CaCO_3$ with XRD, and it indicates that high pure $CaCO_3$ could be obtained during the process.

Keywords

Construction waste;Waste Concrete;Recycling;Sludge;$CaCO_3$

References

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Cited by

  1. An Eco-Friendly Neutralization Process by Carbon Mineralization for Ca-Rich Alkaline Wastewater Generated from Concrete Sludge vol.7, pp.9, 2017, https://doi.org/10.3390/met7090371

Acknowledgement

Supported by : 한국지질자원연구원