In this study the characteristics of various heavy metal-contaminated groundwater remediation methods were confirmed. A highly concentrated heavy metal contamination zone within the currently operational metal smelting facility was selected as the research site. A detailed investigation was conducte...
In this study the characteristics of various heavy metal-contaminated groundwater remediation methods were confirmed. A highly concentrated heavy metal contamination zone within the currently operational metal smelting facility was selected as the research site. A detailed investigation was conducted to examine the natural environment and contamination characteristics, including meteorological conditions, hydraulic conductivity, groundwater levels, and variations in heavy metal concentrations. The specific features of the research site were identified. Subsequently, a chemical remediation chosen from in-situ remediation methods was applied to the research site taking into account groundwater contamination and behavior characteristics.
Calcium polysulfide(CaSx, CPS) recognized for its ability to react with heavy metals and precipitate them as sulfides without significant influence from various physicochemical conditions, was selected as the reducing agent. The results of CPS injection at the research site confirmed the effective reduction of highly concentrated contaminated heavy metals(Cd, Zn, etc.) by more than 99%. The reduction of Cd was sustained over an extended period, attributed to the low solubility product constant (CdS, Ksp = 1.0 × 10-27) of the precipitate produced by the reaction. Monitoring pH, ORP, EC, and DO enable the observation of trends such as the reduction of heavy metals in groundwater, the radius of influence, and the continuity of the reduction. However, for accurate confirmation, it is emphasized that data must be collected and the correlations need to be clearly identified through long-term CPS solution injection and monitoring. Confirmation of changes in hydraulic conductivity due to precipitate occurrence revealed that injecting water before and after CPS solution prevent clogging around the observation well. This allowed the injected CPS solution to disperse downward in the direction of groundwater flow, preventing well clogging. Consequently, this results demonstrated the potential to disperse precipitate within the ground effectively.
In the research site, the injection of 1,000 L of a 5% CPS solution twice a month established a CPS reactive zone, leading to a substantial reduction in the high concentration of heavy metals dissolved in groundwater. Additionally, injecting 1,000 L of water four times a week ensured the downward spread of the CPS solution, preventing a decrease in the permeability and clogging due to precipitate generation. This process expanded the radius of influence of the CPS solution.
In this study the characteristics of various heavy metal-contaminated groundwater remediation methods were confirmed. A highly concentrated heavy metal contamination zone within the currently operational metal smelting facility was selected as the research site. A detailed investigation was conducted to examine the natural environment and contamination characteristics, including meteorological conditions, hydraulic conductivity, groundwater levels, and variations in heavy metal concentrations. The specific features of the research site were identified. Subsequently, a chemical remediation chosen from in-situ remediation methods was applied to the research site taking into account groundwater contamination and behavior characteristics.
Calcium polysulfide(CaSx, CPS) recognized for its ability to react with heavy metals and precipitate them as sulfides without significant influence from various physicochemical conditions, was selected as the reducing agent. The results of CPS injection at the research site confirmed the effective reduction of highly concentrated contaminated heavy metals(Cd, Zn, etc.) by more than 99%. The reduction of Cd was sustained over an extended period, attributed to the low solubility product constant (CdS, Ksp = 1.0 × 10-27) of the precipitate produced by the reaction. Monitoring pH, ORP, EC, and DO enable the observation of trends such as the reduction of heavy metals in groundwater, the radius of influence, and the continuity of the reduction. However, for accurate confirmation, it is emphasized that data must be collected and the correlations need to be clearly identified through long-term CPS solution injection and monitoring. Confirmation of changes in hydraulic conductivity due to precipitate occurrence revealed that injecting water before and after CPS solution prevent clogging around the observation well. This allowed the injected CPS solution to disperse downward in the direction of groundwater flow, preventing well clogging. Consequently, this results demonstrated the potential to disperse precipitate within the ground effectively.
In the research site, the injection of 1,000 L of a 5% CPS solution twice a month established a CPS reactive zone, leading to a substantial reduction in the high concentration of heavy metals dissolved in groundwater. Additionally, injecting 1,000 L of water four times a week ensured the downward spread of the CPS solution, preventing a decrease in the permeability and clogging due to precipitate generation. This process expanded the radius of influence of the CPS solution.
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