Manganese release linked to carbonate dissolution during the start-up phase of a subsurface iron removal well in Khabarovsk, Russia
| Autor: | J. Herlitzius, S. Paufler, V.V. Kulakov, Thomas Grischek, Jörg Feller |
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| Rok vydání: | 2019 |
| Předmět: |
geography
Environmental Engineering geography.geographical_feature_category 010504 meteorology & atmospheric sciences Carbonate minerals chemistry.chemical_element Aquifer Manganese 010501 environmental sciences 01 natural sciences Pollution Grain size chemistry.chemical_compound chemistry Environmental chemistry Environmental Chemistry Carbonate Leaching (metallurgy) Waste Management and Disposal Dissolution Groundwater 0105 earth and related environmental sciences |
| Zdroj: | Science of The Total Environment. 650:1722-1733 |
| ISSN: | 0048-9697 |
| Popis: | Subsurface iron removal (SIR) is a proven pre-treatment technology for removing dissolved iron and manganese from groundwater. The start-up phase of a SIR well and the proper development of the reaction zone around the well are crucial for its subsequent performance. This study evaluates the start-up phase of a SIR production well in Khabarovsk, Russia during the first 194 SIR cycles. A strong release of manganese was observed, which led to concentrations twice as high as the background value of the pristine groundwater. Regular monitoring of the production well and its three adjacent observation wells showed that iron removal began immediately after start-up and that the reaction zone was completely formed within 25 SIR cycles. Closed-bottle batch tests and a flow-through leaching test revealed that the grain size of the aquifer material and groundwater pH are the primary controls on manganese release. During infiltration phases the dissolution of manganese-bearing carbonate minerals was caused by direct oxidation by O2, whereas the low groundwater pH of 6 seemed to be responsible for the manganese release during extraction. |
| Databáze: | OpenAIRE |
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