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Helmut Lorbeer Sophie Starke Misri Gozan Andreas Tiehm Peter Werner 《Water, Air, & Soil Pollution: Focus》2002,2(3):183-193
During the past decade, various promising technologies have been developed for the decontamination of groundwater insitu which do not require long-term pumping or high energy consumption. One approach is to use funnel and gate technology. In the case described here, the combination of adsorption of contaminants on granular activated carbon (GAC) and its biodegradation is applied to considerably extend the operating time of the filling material in the barrier system. Monochlorobenzene (MCB), a recalcitrant groundwater contaminant under anaerobic conditions, undergoes high-capacity adsorption on GAC up to about 450 mg per gram. Aerobic enrichment cultures, obtained from a contaminated aquifer, were able to mineralize initially adsorbed MCB. In respirometer experiments the rate of carbon dioxide formation was dependent on the equilibrium concentration of MCB. The oxygen consumption of activated carbon by means of autoxidative reactions may delay aerobic biodegradation in GAC filters. The oxygen uptake of pristine activated carbon amounted to 5.6 mg per gram GAC in laboratory column experiments. When GAC was pre-loaded with MCB, autoxidation rates were considerably reduced. Hence, it is advisable not to stimulate the biodegradation of MCB by oxygen supply in GAC biobarriers until after an initial period of solely sorptive MCB removal from the groundwater flow. 相似文献
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Werner Brack Michaela Hein Stefan Jansen und Peter von der Ohe 《Umweltwissenschaften und Schadstoff-Forschung》2007,19(3):A6
Ohne Zusammenfassung 相似文献
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Christian Sens Petra Scheidemann Andreas Klunk Dietrich Werner 《Environmental science and pollution research international》1998,5(4):202-208
14C-TNT was used to quantify the uptake rate and metabolic turnover of TNT inPhaseolus vulgaris. Seventeen plants were analysed by a special cell fractionation method with polar and nonpolar solvents and enzymes. We obtained
three cytoplasmic fractions and five cell wall derived fractions. The recovery rate was 72% as measured by liquid scintillation
counting.14C partitioned almost in equal amounts with approximately 50% in the cytoplasm and in the cell wall. The majority of the TNT-metabolites
are present in the cytoplasm as was shown by GC/ ECD and thin layer chromatography. The14C in the cell wall is bound probably resulting in long-term immobilisation of these metabolites. We conclude that plants may
also be a model for nitroaromatic turnover and immobilisation in soil components. 相似文献