Abstract:The technogenic impact of the development of the Lomonosov diamond deposit is associated with the discharge of quarry and drainage water into the river, which has a special conservation status. Earlier studies on the composition of bottom sediments showed that there are signs of increased accumulation of heavy metals and radionuclides at wastewater discharge sites. The purpose of this work was to predict changes in the composition of surface water and bottom sediment in the river during the further development… Show more
“…In contrast to Fe, the concentrations of Ca, Mg, and C in the solutions with DOC are somewhat higher in winter than in summer: 10.2-76.5, 6.76-47.9, and 14.2-28 mg/kg H 2 O and 9.55-76.2, 5.25-46.4, and 12.4-26.1 mg/kg H 2 O, respectively (Figure 7e,g, Table 6). At the same time, the summer concentrations of these elements in the solutions with DOC are identical to the concentrations in the solutions without DOC [25]. Accordingly, their precipitation is somewhat worse in winter than in summer.…”
Section: Influence Of Doc On the Intensity Of Precipitation Of Chemic...mentioning
confidence: 71%
“…We have already considered this problem in previous studies [25] using the calculation of the equilibrium composition of mixed solutions. Our task was to estimate the maximum possible scale of sedimentation of secondary minerals from discharged waters.…”
The development of mineral deposits causes changes that are comparable to natural exogenous geological processes, and prevail over the latter in local areas of intensive mining activity. In this article, a diamond deposit is selected, developed by quarries of great depth, and a forecast is made of the impact of drainage water discharge on changes in the composition of surface water and bottom sediments during the entire period of development of the deposit. Modeling was performed according to various scenarios, taking into account changes in the total dissolved solids of groundwater from 0.5 to 21.7 g/kg H2O. Thermodynamic calculations were carried out using the HCh software package. The role of dissolved organic carbon in the migration of chemical elements and the effect of DOC on the precipitation of chemical elements from mixed solutions is given. It has been established that fulvic acid completely binds to Fe in the Fe(OH)2FA− complex in all types of natural waters and under all mixing scenarios. With humic acid, such a sharp competitive complex formation does not occur. It is distributed among the various elements more evenly. It was determined that the mass of precipitating iron in the presence of DOC decreases by 18–27%, and its precipitation in winter is more intense. In contrast to Fe, the precipitation of Ca, Mg, and C from solutions with DOC is higher in summer, and there are more of them in the solutions in winter. This study contributes to a better understanding of the behavior of heavy metals in surface waters and sediments under anthropogenic pressures in order to improve the sustainable management of water resources in the face of anthropogenic activities.
“…In contrast to Fe, the concentrations of Ca, Mg, and C in the solutions with DOC are somewhat higher in winter than in summer: 10.2-76.5, 6.76-47.9, and 14.2-28 mg/kg H 2 O and 9.55-76.2, 5.25-46.4, and 12.4-26.1 mg/kg H 2 O, respectively (Figure 7e,g, Table 6). At the same time, the summer concentrations of these elements in the solutions with DOC are identical to the concentrations in the solutions without DOC [25]. Accordingly, their precipitation is somewhat worse in winter than in summer.…”
Section: Influence Of Doc On the Intensity Of Precipitation Of Chemic...mentioning
confidence: 71%
“…We have already considered this problem in previous studies [25] using the calculation of the equilibrium composition of mixed solutions. Our task was to estimate the maximum possible scale of sedimentation of secondary minerals from discharged waters.…”
The development of mineral deposits causes changes that are comparable to natural exogenous geological processes, and prevail over the latter in local areas of intensive mining activity. In this article, a diamond deposit is selected, developed by quarries of great depth, and a forecast is made of the impact of drainage water discharge on changes in the composition of surface water and bottom sediments during the entire period of development of the deposit. Modeling was performed according to various scenarios, taking into account changes in the total dissolved solids of groundwater from 0.5 to 21.7 g/kg H2O. Thermodynamic calculations were carried out using the HCh software package. The role of dissolved organic carbon in the migration of chemical elements and the effect of DOC on the precipitation of chemical elements from mixed solutions is given. It has been established that fulvic acid completely binds to Fe in the Fe(OH)2FA− complex in all types of natural waters and under all mixing scenarios. With humic acid, such a sharp competitive complex formation does not occur. It is distributed among the various elements more evenly. It was determined that the mass of precipitating iron in the presence of DOC decreases by 18–27%, and its precipitation in winter is more intense. In contrast to Fe, the precipitation of Ca, Mg, and C from solutions with DOC is higher in summer, and there are more of them in the solutions in winter. This study contributes to a better understanding of the behavior of heavy metals in surface waters and sediments under anthropogenic pressures in order to improve the sustainable management of water resources in the face of anthropogenic activities.
“…Risk assessment of natural water and soil pollution and the planning of dump disposal in mining areas is crucial for environmental sustainability [1]. Such ecological aspects of ore development are considered by geochemists [2][3][4][5], together with the transport of typical pollutants of mining areas [6][7][8][9][10]. Another urgent problem is the environmental impact of abandoned mines: dumps, tailings, and flooded mines, which are out of supervision, lead to pollution of soils and natural waters [11][12][13].…”
Abandoned mines are sources of potentially toxic chemical elements, although the development of these objects was completed. The Lupikko I mine area (Karelia Republic, Russia) is an excellent example of such technogenic objects. It is one of the largest mines in the Pitkäranta area, which was abandoned more than one hundred years ago. The dump rocks here are characterized by significant mineral diversity. Disseminated ore mineralization of the study area contains heavy metals, which enter the natural waters due to the oxidative dissolution of sulfides. Dump rocks and water from the Lupikko I mine area were collected to research the behavior of toxic elements. The samples were analyzed using ICP-MS, ICP-AES, potentiometric titration, ionic chromatography, X-ray microanalysis, X-ray fluorescence, and SEM to obtain information about the geochemical environment. According to new data, the content of Fe, Zn, Cu, Pb, Cd, and Ni in the natural waters of the mine significantly exceeds the geochemical background. For a more detailed study of the behavior of heavy metals, equilibrium-kinetic modeling, which considers the dissolution rate of ore minerals and the accumulation of toxic elements over time, was applied. A comparison of modeling data and field observations agreed. It was also found that for accurate modeling of Fe behavior, it is necessary to consider the organic matter content. Despite some model limitations, such retrospective assessments allow us to approve the applicability of this method for forecasting estimates.
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