Strength and leaching behavior of heavy metal contaminated sludge solidified/stabilized by compound binders

Wang, Yuexiang; Tang, Jie; Li, Zhuang

doi:10.1016/j.envres.2021.111053

Cited by 22 publications

(3 citation statements)

References 34 publications

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“…The convestion of heavy metals is affected by extracted liquation, stabilizers and leaching characteristics, etc. The morphological transformation and migration characteristics of heavy metals have an effect on the long term leaching behavior of hazardous compounds [11]. The solidification process indicates that the waste compounds are trapped in the porous gel structure's pores, and heavy metal securing generates insoluble metal hydroxides.…”

Section: 2 Tclp Test Resultsmentioning

confidence: 99%

Solidification/Stabilization of waste containing lead using flyash and bentonite

Simangunsong

Fransiscus

Prayitno

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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In this study, the Stabilization/Solidification was used to treat Pb as heavy metal waste using flyash and bentonite, as binder and mixing agent. Flyash and bentonite was mixed with the waste containing Pb and formed to cube called “mortar” with a size of 5x5x5 cm. The variations of flyash and bentonite were 100:0, 90:10, 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80, 10:90, and 0:100. Then the mortars had a curing time process for 7 days, 14 days, and 28 days. After curing time process, the products tested using a compressive strength test and TCLP test. Result of compressive strength test indicated that the optimum compressive strength value occurred in 100% fly ash composition with 28 days curing time. The estimation of compressive strength test was 3220 tons/m2. The result of the TCLP test showed the optimum TCLP test results occurred at 100% fly ash composition and the rate was 0,0338 mg/L Pb. The composition of fly ash and bentonite showed a significant effect on the compressive strength and TCLP test.

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Section: 2 Tclp Test Resultsmentioning

confidence: 99%

Solidification/Stabilization of waste containing lead using flyash and bentonite

Simangunsong

Fransiscus

Prayitno

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…The e cient treatment of Pb-containing wastewater is an enduring worldwide problem (Jiryaei Sharahi and Shahbazi, 2017). The common treatment methods are biological treatment (Abd Aziz et al, 2019), chemical treatment (Wang et al, 2021), reverse osmosis treatment (Parlar et al, 2019), membrane separation (Zeng et al, 2019), etc. But most of the treatment methods are more costly, while the method of adsorption is a low cost, convenient, and widely used one.…”

Section: Introductionmentioning

confidence: 99%

Two-step modification of sepiolite (SDS/isep) and its performance for remediation of Pb contaminated water

Feng

Wang

et al. 2023

Preprint

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To enhance the remediation capability of lead (Pb) polluted water, our approach involved a two-step modification of the initial sepiolite (sep) through inorganic mixed solutions and sodium dodecanesulfonate (referring as SDS/isep), and then the modified sepiolite (SDS/isep) is used to remove Pb2+ in Pb-contaminated water. Adsorption experiments showed that the SDS/isep had a significantly higher adsorption capacity for Pb2+ than natural sepiolite (the adsorption capacities before and after modification were 19.04 and 49.10 mg g− 1). A series of characterizations combined with adsorption kinetics and thermodynamics analysis revealed the adsorption mechanism of SDS/isep for Pb2+. The analysis results show that the monolayer adsorption of SDS/isep to Pb2+ is mainly carried out by ion exchange, surface hydroxyl complexation, chemical precipitation, and electrostatic attraction, and this adsorption reaction is a spontaneous exothermic process. The above positive results indicate the superiority of the two-step modification strategy of natural sepiolite proposed in this study.

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“…The efficiency of S/S strongly depends on the amount of curing agent [8]. However, the capacity increment ratio and cost will significantly increase when stabilizing heavily contaminated sediments owing to the requirement of a high cement/water ratio to reduce the leaching of heavy metals [9]. What is more, production of most curing agents has a high carbon footprint, which is not acceptable for environmental purposes.…”

Section: Introductionmentioning

confidence: 99%

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

Yang¹,

Li²,

Sun³

et al. 2022

Sustainability

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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%).

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Strength and leaching behavior of heavy metal contaminated sludge solidified/stabilized by compound binders

Cited by 22 publications

References 34 publications

Solidification/Stabilization of waste containing lead using flyash and bentonite

Solidification/Stabilization of waste containing lead using flyash and bentonite

Two-step modification of sepiolite (SDS/isep) and its performance for remediation of Pb contaminated water

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

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