Adsorption Characteristics and Transport Behavior of Cr(VI) in Shallow Aquifers Surrounding a Chromium Ore Processing Residue (COPR) Dumpsite
This study explored the stratigraphic distribution and soil/shallow aquifer characteristics surrounding a chromium ore processing residue (COPR) dumpsite at a former chemical factory in China. Total Cr levels in top soils (5–10 cm) nearby the COPR dumpsite were in the range of 8571.4–10711.4 mg/kg....
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2019-01-01
|
| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2019/4932837 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832550940642639872 |
|---|---|
| author | Yu Liu Yin Li Yucheng Hu Khan M. G. Mostofa Siliang Li Zhenying Liu |
| author_facet | Yu Liu Yin Li Yucheng Hu Khan M. G. Mostofa Siliang Li Zhenying Liu |
| author_sort | Yu Liu |
| collection | DOAJ |
| description | This study explored the stratigraphic distribution and soil/shallow aquifer characteristics surrounding a chromium ore processing residue (COPR) dumpsite at a former chemical factory in China. Total Cr levels in top soils (5–10 cm) nearby the COPR dumpsite were in the range of 8571.4–10711.4 mg/kg. Shallow aquifers (1–6 m) nearby the COPR dumpsite showed a maximum total Cr level of 9756.7 mg/kg. The concentrations of Cr(VI) in groundwater nearby the COPR dumpsite were 766.9–1347.5 mg/L. These results display that the top soils, shallow aquifers, and groundwater of the study site are severely polluted by Cr(VI). Then, three aquifers (silt, clay, and silty clay), respectively, collected from the depth of 1.4–2.4 m, 2.4–4.8 m, and 4.8–11.00 m were first used to evaluate the adsorption characteristics and transport behavior of Cr(VI) in shallow aquifers by both batch and column experiments. The adsorption of Cr(VI) on tested aquifers was well described by pseudo-second-order equation and Freundlich model. The adsorption capacities of Cr(VI) on three aquifers followed the order: clay > silty clay > silt. The kinetics proved that Cr(VI) is not easily adsorbed by the aquifer mediums but transports with groundwater. Thermodynamics indicated that Cr(VI) adsorption on tested aquifers was feasible, spontaneous, and endothermic. Cr(VI) adsorption on tested aquifers decreased with increasing pH. Furthermore, the transport of Cr(VI) in adsorption columns followed the sequence of clay < silty clay < silt. Desorption column experiments infer that the Cr(VI) adsorbed on aquifers will desorb and release into groundwater in the case of rainwater leaching. Therefore, a proper treatment of the COPR and a comprehensive management of soils are vital to prevent groundwater pollution. |
| format | Article |
| id | doaj-art-dc8eed2f36064aaebc85d71d7557749e |
| institution | Kabale University |
| issn | 2090-9063 2090-9071 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Chemistry |
| spelling | doaj-art-dc8eed2f36064aaebc85d71d7557749e2025-02-03T06:05:23ZengWileyJournal of Chemistry2090-90632090-90712019-01-01201910.1155/2019/49328374932837Adsorption Characteristics and Transport Behavior of Cr(VI) in Shallow Aquifers Surrounding a Chromium Ore Processing Residue (COPR) DumpsiteYu Liu0Yin Li1Yucheng Hu2Khan M. G. Mostofa3Siliang Li4Zhenying Liu5Institute of Surface-Earth System Science, Tianjin University, Weijin Road 92, Tianjin 300072, ChinaTianjin Hydraulic Science Research Institute, Youyi Road 60, Tianjin 300061, ChinaTianjin Hydraulic Science Research Institute, Youyi Road 60, Tianjin 300061, ChinaInstitute of Surface-Earth System Science, Tianjin University, Weijin Road 92, Tianjin 300072, ChinaInstitute of Surface-Earth System Science, Tianjin University, Weijin Road 92, Tianjin 300072, ChinaSchool of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300191, ChinaThis study explored the stratigraphic distribution and soil/shallow aquifer characteristics surrounding a chromium ore processing residue (COPR) dumpsite at a former chemical factory in China. Total Cr levels in top soils (5–10 cm) nearby the COPR dumpsite were in the range of 8571.4–10711.4 mg/kg. Shallow aquifers (1–6 m) nearby the COPR dumpsite showed a maximum total Cr level of 9756.7 mg/kg. The concentrations of Cr(VI) in groundwater nearby the COPR dumpsite were 766.9–1347.5 mg/L. These results display that the top soils, shallow aquifers, and groundwater of the study site are severely polluted by Cr(VI). Then, three aquifers (silt, clay, and silty clay), respectively, collected from the depth of 1.4–2.4 m, 2.4–4.8 m, and 4.8–11.00 m were first used to evaluate the adsorption characteristics and transport behavior of Cr(VI) in shallow aquifers by both batch and column experiments. The adsorption of Cr(VI) on tested aquifers was well described by pseudo-second-order equation and Freundlich model. The adsorption capacities of Cr(VI) on three aquifers followed the order: clay > silty clay > silt. The kinetics proved that Cr(VI) is not easily adsorbed by the aquifer mediums but transports with groundwater. Thermodynamics indicated that Cr(VI) adsorption on tested aquifers was feasible, spontaneous, and endothermic. Cr(VI) adsorption on tested aquifers decreased with increasing pH. Furthermore, the transport of Cr(VI) in adsorption columns followed the sequence of clay < silty clay < silt. Desorption column experiments infer that the Cr(VI) adsorbed on aquifers will desorb and release into groundwater in the case of rainwater leaching. Therefore, a proper treatment of the COPR and a comprehensive management of soils are vital to prevent groundwater pollution.http://dx.doi.org/10.1155/2019/4932837 |
| spellingShingle | Yu Liu Yin Li Yucheng Hu Khan M. G. Mostofa Siliang Li Zhenying Liu Adsorption Characteristics and Transport Behavior of Cr(VI) in Shallow Aquifers Surrounding a Chromium Ore Processing Residue (COPR) Dumpsite Journal of Chemistry |
| title | Adsorption Characteristics and Transport Behavior of Cr(VI) in Shallow Aquifers Surrounding a Chromium Ore Processing Residue (COPR) Dumpsite |
| title_full | Adsorption Characteristics and Transport Behavior of Cr(VI) in Shallow Aquifers Surrounding a Chromium Ore Processing Residue (COPR) Dumpsite |
| title_fullStr | Adsorption Characteristics and Transport Behavior of Cr(VI) in Shallow Aquifers Surrounding a Chromium Ore Processing Residue (COPR) Dumpsite |
| title_full_unstemmed | Adsorption Characteristics and Transport Behavior of Cr(VI) in Shallow Aquifers Surrounding a Chromium Ore Processing Residue (COPR) Dumpsite |
| title_short | Adsorption Characteristics and Transport Behavior of Cr(VI) in Shallow Aquifers Surrounding a Chromium Ore Processing Residue (COPR) Dumpsite |
| title_sort | adsorption characteristics and transport behavior of cr vi in shallow aquifers surrounding a chromium ore processing residue copr dumpsite |
| url | http://dx.doi.org/10.1155/2019/4932837 |
| work_keys_str_mv | AT yuliu adsorptioncharacteristicsandtransportbehaviorofcrviinshallowaquiferssurroundingachromiumoreprocessingresiduecoprdumpsite AT yinli adsorptioncharacteristicsandtransportbehaviorofcrviinshallowaquiferssurroundingachromiumoreprocessingresiduecoprdumpsite AT yuchenghu adsorptioncharacteristicsandtransportbehaviorofcrviinshallowaquiferssurroundingachromiumoreprocessingresiduecoprdumpsite AT khanmgmostofa adsorptioncharacteristicsandtransportbehaviorofcrviinshallowaquiferssurroundingachromiumoreprocessingresiduecoprdumpsite AT siliangli adsorptioncharacteristicsandtransportbehaviorofcrviinshallowaquiferssurroundingachromiumoreprocessingresiduecoprdumpsite AT zhenyingliu adsorptioncharacteristicsandtransportbehaviorofcrviinshallowaquiferssurroundingachromiumoreprocessingresiduecoprdumpsite |