Description: Das Projekt "In-Situ Remediation Technologies, Investigation of Remediation Options for a CS2-Contaminated Aquifer" wird/wurde gefördert durch: CEL International Ltd. Es wird/wurde ausgeführt durch: Universität Stuttgart, Institut für Wasserbau.The feasibility of an in-situ remediation of a shallow aquifer underneath a production building contaminated with carbon disulphide (CS2) up to residual saturation was investigated under contact of an international chemical company and its consultant. Two different methods were investigated on a lab scale to determine the remediation capacity: alcohol flushing and hot water flushing. Additionally the treatment and destruction of the effluent contaminant as well as the regeneration of the applied alcohol was investigated under the aspects of efficiency and costs. Alcohol Flushing: Based on column experiments it was found that a mixture of ispropanol and water (70/30, v/v) was adequate to remove more than 99% of the residual contaminant mass during less than 5 pore volumes of flushed alcohol mixture. The density of the initial CS2 was significantly reduced and resulted in forming a single phase LNAPL mixture. No co-solvent alcohol was required. The 2-D box experiments with original soil from the contaminated site verified the high remediation capacity of the flushing technology. During the box experiments the investigations were focused on the design of an adequate hydraulic system to remove CS2 from the bottom of the aquifer using horizontal wells. The hydraulic system was designed by numerical modeling. After flushing the soil with 7 pore volumes of the alcohol mixture, only 0.2 % of the initial CS2 contamination remained in the soil. For financial reasons a recycling of the alcohol is required. Concerning the separation process (alcohol from CS2), the efficiency of chemical adsorption on activated carbon and stripping was investigated. For the concentration process of the used alcohol mixture rectification, distillation, and vacuum evaporation were examined. The cost of recycling the isopropanol and the oxidation process to destruct CS2 were estimated to be half of the price of isopropanol of industrial quality. Hot Water Flooding: The 2-D box experiment applying hot water flooding (75°C) demonstrated the applicability of this technology to remediate a carbon disulphide contaminated aquifer using soil material from the site. Due to the physical properties of CS2 the remediation process is based on evaporation (soil vapor extraction), mobilization of free product and thermal destruction. (abridged text)
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Origin: /Bund/UBA/UFORDAT
Tags: Rohstoffrückgewinnung ? Recycling ? Schwefelkohlenstoff ? Überschwemmung ? Aktivkohlefilter ? Alkohol ? Altlast ? Chemische Industrie ? Grundwassergefährdung ? Kohlenstoff ? Grundwasserzustand ? Warmwasser ? Gebäude ? Grundwassersanierung ? Adsorption ? Grundwasserschutz ? Grundwasserverunreinigung ? Machbarkeitsstudie ? Pyrolyse ? Verdunstung ? Kostenanalyse ? Ausblasverfahren ? Chemikalien ? Grundwasserleiter ? Abwasser ? Destillation ? Bodenluft ? Oxidation ? Gewässergrund ? Absaugung ? Altlastensanierung ? Bodensanierung ? Wassergefährdende Stoffe ? Wasserverschmutzung ? Werkstoffkunde ? Modellierung ? Kosteneffizienz ? Rückstand ? Sanierung ? Schadstoff ? Aufbereitungstechnik ? Reinigungsverfahren ? Sieb ? Reinigung ? Verdampfung ? Konzentrierung ?
Region: Baden-Württemberg
Bounding boxes: 9° .. 9° x 48.5° .. 48.5°
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 2002-04-01 - 2002-09-30
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