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08.02.2012. |
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Groundwater - Saturated Zone
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04.11.2009. |
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With the conventional "Pump & Treat" method, groundwater is normally extracted from one or several wells, cleaned above ground and disposed off to the either groundwater or surface water. Even when extraction and injection wells are combined, predominantly higher permeable areas are preferentially penetrated and more fine-grained structures are circumflowed. The bulk of contaminants are absorbed to the less permeable materials like fine-grained sands, silty or clayey layers. By diffusion, the contaminants are released out of these reservoirs very slowly. After a short period of time they effect a stagnation of the contamination discharge ("Tailing Effect").
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Czytaj całość… [Groundwater Circulation Well Technology]
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29.07.2008. |
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With a GCW it is possible to remove non-miscible liquids of higher density than water (DNAPL) from an aquifer. In order to remove dense non aqueous phase liquids (DNAPL) that have accumulated on the bottom of the aquifer, the GCW is operated in standard mode. The DNAPL is removed by means of a sensor-controlled, pneumatically-driven submersible pump. Thus it is made sure that just pure phase and no groundwater is extracted.
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Czytaj całość… [DNAPL-Recovery]
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29.07.2008. |
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With a GCW it is possible to remove non-miscible liquids of lower density than water (LNAPL) from an aquifer. In order to remove light non aqueous liquids floating on the groundwater, the GCW is operated in a reverse mode. The LNAPL is removed by means of a sensor-controlled, pneumatically-driven submersible pump. Thus it is made sure that just pure phase and no groundwater is extracted.
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Czytaj całość… [LNAPL-Recovery]
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02.04.2008. |
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By means of different techniques oxygen, gas mixtures but also nutrient solutions can be added to the GCW circulation water. Thus, more oxygen-rich and contaminant-reduced groundwater circulates through the aquifer and stimulates microbiological degradation respectively creates better bio-availability. Metabolites impeding the growth of autochthonic microorganisms or the CO2 produced by the biological decomposition can be transported to the well with the groundwater and can be selectively removed there.
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Czytaj całość… [Microbiologically enhanced GCW]
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02.04.2008. |
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The achievable sphere of influence of a GCW-System depends on the distance of the two active screen sections, the anisotropy of the aquifer, the groundwater flow velocity and the selected pumping rate. The bigger the circulation cell is, the longer a water molecule needs to pass through the cell.
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Czytaj całość… [Stacked GCW]
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19.02.2007. |
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Pionowa studnia cyrkulacyjna wody gruntowej może również być używana jako pompa lub studnia infiltracyjna do standardowej remediacji typu on-site. W takich przypadkach częściowe wycofanie lub infiltracja jest odejmowana lub dodawana do ogólnej objętości wody gruntowej przepływającej przez studnię. Jest możliwa ekstrakcja bądź infiltracja wody bez zmiany słupa wody gruntowej na wierzchu studni dla specyficznej dawki wydobytego lub infiltrowanego przepływu do pionowego przepływu cyrkulacyjnego wokół studni.
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Czytaj całość… [Technologia GCW IEG – częściowa ekstrakcja i infiltracja]
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