Description: Das Projekt "Mikrobielle 'in situ'-Sanierung mittels Frac-Verfahren" wird vom Umweltbundesamt gefördert und von Osthannoversche Eisenbahnen durchgeführt. Objective: The project is to clean up the soil of the Nettelbeck railway station that is contaminated by hydrocarbons due to approximately 30 years of trans-shipment activities. Soil excavation not being possible without seriously disturbing normal operation at the station, OHE decided to wash the soil using the FRAK technology for breaking up the bound soil structures. The soil is then percolated in situ with water enriched with nutrients and oxygen in order to create optimum conditions for microbial activity; the groundwater whose level is closely below the surface is extracted and hydrocarbons are skimmed off by an external skim reactor. General Information: After two years of operation, German authorities accepted the FRAK-assisted microbial clean-up of the railway trans-shipment site of OSTHANNOVERSCHE EISENBAHNEN AG (OHE) at Nettelbeck near Hamburg which had been contaminated with mineral oil as satisfactory. This demonstration of the efficiency of the FRAK installation was granted assistance by the European Commission, within its ACE 89 programme on demonstration projects on clean technologies and contaminated site monitoring and rehabilitation. The project demonstrated the successful clean-up of soil contaminated by mineral oil at an average concentration of 3.500 mg hydrocarbons per kg. The goal was to clean up the soil to concentration values below 1000 mg/kg and groundwater to concentrations of less than 0,1 mg/l, the national tolerability limits being 0,4 mg/l. It was shown that this in-situ clean-up had no adverse effects on the neighbouring groundwater environment. The process was to extract polluted groundwater, remove oil beyond the dilution limits of approximately 5 mg/l, load the cleaned-up water with oxygen and nutrients and percolate the soil with the recycled water. Within this cycle, microbes feeding on mineral oil digested the remaining hydrocarbons. It could be shown that the initial nutrient reservoir was used up during digestion, which made the addition of phosphate and nitrate necessary in later phases of the cycle. To achieve clean-up to the goals set, the percolating water - ca. 75 times the average rainfall quantity - had to be recycled for approximately 160 times. The rate of hydrocarbon removal was remarkable: within eight weeks on the average, approximately 90 per cent of the contaminants could be removed. The digestion and percolation processes were greatly enhanced by air-pressure-assisted tear-up of the soil structure using a FRAK installation that had been constructed by DETLEF HEGEMANN ENGINEERING GmbH with Commission assistance within the ACE 89 programme; water percolation was drastically enhanced by a factor of five, which made the microbial in-situ treatment of soils with low penetrability (kF) value below 10-4 feasible...
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Fracking ? Bodennährstoff ? Erdöl ? Nährstoffgehalt ? Phosphat ? Phosphorsäureester ? Schadstoffgehalt ? Nitrat ? Alicyclischer Kohlenwasserstoff ? Hamburg ? Altlast ? Europäische Kommission ? Kohlenwasserstoff ? Langzeitwirkung ? Mineralstoff ? Nährstoff ? Sauerstoff ? Mikrobiologie ? Bahnhof ? Aufbereitungstechnik ? Bodenstruktur ? Bodenverunreinigung ? Bodenwasser ? Dränwasser ? Forschungsförderung ? Grundwasserschutz ? Sickerwasser ? Wasserreinigung ? Konzentrationswert ? Grundwasser ? Abfallwirtschaft ? Sauerstoffgehalt ? Messverfahren ? Altlastensanierung ? Verdünnung ? Verfahrenstechnik ? Wasseraufbereitung ? Monitoring ? Mikroorganismen ? Filtration ? Bodensanierung ? Niedrigwasser ? Biologischer Abbau ? Reinigungsverfahren ? Biologische Aktivität ? Bodenschadstoff ? Bodenschutz ? Abgrabung ? Bodenwert ? Perkolation ? Reaktor ? Eisenbahn ? Niederschlag ? Versickerung ? Sanierung ? Umweltfreundliche Technologie ? Umweltschutz ? Wasseroberfläche ? in situ ? Wasserstand ? FRAK-Verfahren ?
Region: Lower Saxony
Bounding box: 9.16667° .. 9.16667° x 52.83333° .. 52.83333°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1991-08-12 - 1993-12-31
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