Enzyme-Induced Carbonate Precipitation for the Stabilization of Heavy Metal-Contaminated Landfill Soils: A Sustainable Approach to Resource Recovery and Environmental Remediation DOI Open Access
Wangqing Xu, Junjie Zheng, Mingjuan Cui

и другие.

Sustainability, Год журнала: 2025, Номер 17(10), С. 4630 - 4630

Опубликована: Май 18, 2025

Heavy metal pollution in landfill soil poses a dual challenge of environmental toxicity and resource depletion. Enzyme-induced carbonate precipitation (EICP) was systematically evaluated as sustainable stabilization method for cadmium (Cd), lead (Pb), chromium (Cr) under both solution- soil-phase conditions. Laboratory-scale experiments demonstrated that EICP achieved over 80% removal efficiency Cd, Pb, copper (Cu) solution-phase systems, while trials focused on Cr to simulate realistic field Optimal performance using 1:1 molar ratio soybean-derived urease (1.0 U/mL) CaCl2 (0.5 M), with Cd reaching 91.5%. Vacuum-assisted filtration improved treatment uniformity by 29.2% clay soils. X-ray diffraction identified crystalline otavite Pb Cu were stabilized via surface adsorption. Sequential extraction confirmed 70% transformed into carbonate-bound phases. Treated soils met TCLP leaching standards reuse criteria, maintaining neutral pH (7.2–8.1) low salinity. Compared cement-based methods, avoids CO2 release from calcination fossil fuel use. Carbon urea is retained solid CaCO3, reducing emissions 0.3–0.5 t CO2-eq per ton soil. These findings support scalable, low-carbon alternative remediation.

Язык: Английский

Enzyme-Induced Carbonate Precipitation for the Stabilization of Heavy Metal-Contaminated Landfill Soils: A Sustainable Approach to Resource Recovery and Environmental Remediation DOI Open Access
Wangqing Xu, Junjie Zheng, Mingjuan Cui

и другие.

Sustainability, Год журнала: 2025, Номер 17(10), С. 4630 - 4630

Опубликована: Май 18, 2025

Heavy metal pollution in landfill soil poses a dual challenge of environmental toxicity and resource depletion. Enzyme-induced carbonate precipitation (EICP) was systematically evaluated as sustainable stabilization method for cadmium (Cd), lead (Pb), chromium (Cr) under both solution- soil-phase conditions. Laboratory-scale experiments demonstrated that EICP achieved over 80% removal efficiency Cd, Pb, copper (Cu) solution-phase systems, while trials focused on Cr to simulate realistic field Optimal performance using 1:1 molar ratio soybean-derived urease (1.0 U/mL) CaCl2 (0.5 M), with Cd reaching 91.5%. Vacuum-assisted filtration improved treatment uniformity by 29.2% clay soils. X-ray diffraction identified crystalline otavite Pb Cu were stabilized via surface adsorption. Sequential extraction confirmed 70% transformed into carbonate-bound phases. Treated soils met TCLP leaching standards reuse criteria, maintaining neutral pH (7.2–8.1) low salinity. Compared cement-based methods, avoids CO2 release from calcination fossil fuel use. Carbon urea is retained solid CaCO3, reducing emissions 0.3–0.5 t CO2-eq per ton soil. These findings support scalable, low-carbon alternative remediation.

Язык: Английский

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