Optimization of Solidification and Stabilization Efficiency of Heavy Metal Contaminated Sediment Based on Response Surface Methodology

Yang Yang, Moting Li, Yan Sun, Huimin Gao, Lingchen Mao, He Zhang and Hong Tao
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Yang Yang: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Moting Li: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Yan Sun: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Huimin Gao: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Lingchen Mao: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
He Zhang: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
Hong Tao: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China

Sustainability, 2022, vol. 14, issue 6, 1-10

Abstract: Solidification and stabilization (S/S) by agents and stabilizers is an effective way to treat heavy metal-contaminated sediments. Optimization of curing condition is crucial to minimize the consumption of reagents on the base of effective S/S. In this work, the synergistic effects of cement and stabilizer on mechanical strength and leaching toxicity of contaminated sediments were investigated, and the S/S conditions were optimized using response surface methodology. On the basis of a single-factor test, multi-factor experiments were conducted to fit the relationship between the S/S effect of contaminated sediments and the amount of cement and stabilizer. The mechanism of stabilization was investigated by the results from the revised BCR method. The results indicate that the optimal curing conditions were 44.29% of cement content with 2.05% of trimercapto-s-triazine trisodium salt (TMT). After 28 days of curing, the compressive strength reached 2.07 MPa and the leaching concentrations of Cd, Cu, and Pb were 0.094 mg/L, 0.031 mg/L, and 0.173 mg/L, respectively, which met the requirement of in-situ resource recycling standard. The stability of heavy metals was significantly improved as a result of the removal of acid extractable fraction (15.58~69.92%) and an increase in the residual fraction (18.27~49.07%).

Keywords: TMT; unconfined compressive strength; leaching toxicity; revised BCR method; heavy metal fractionation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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