Efficiency of various binders in solidification/stabilization of heavy metals and compressive strength in sludge of Ceramic tile factory Niloufar in Birjand

Document Type : Research Article

Authors

1 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, University of Birjand, Birjand, Iran

2 Department of Civil Engineering, Faculty of Engineering, University of Birjand, Birjand, Iran

3 Assistant professor-Department of Earth Sciences Engineering- Arak University of Technology-Arak-Iran

Abstract

Solidification/stabilization (S/S) is a common process in the treatment of sludge containing heavy metals. In this study, S/S of ceramic tile industry sludge was investigated using cement and additives like water, lime, microsilica, and clay. By response surface methodology, the effect of different additives on compressive strength and metals concentration after the pollution leakage test was evaluated. Results showed the highest compressive strength in high amounts of cement. Decreasing the waste and replacing more lime, clay, and microsilica, the compressive strength increased. Under obtained optimum conditions, by 5.77% lime, 8.69% clay, 4.35% microsilica, and 51.84% cement, the maximum compressive strength was achieved at about 116 kg/cm2. The minimum concentration of Cr was 0.0782 mg/L and resulted from 11.23% lime, 21.31% clay, 10.65% microsilica and 27.46% cement. Minimum Pb concentration (0.0043 mg/L) was obtained in 11.23% lime, 21.31% clay, 4.35% microsilica and 33.76% cement. The more efficiency in compressive strength is related to cement. In addition, applying the binders concluded the effective reduction of Cr and Pb concentration in leaching the stabilized samples.

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Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 55, Issue 4
July 2023
Pages 741-756

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