Browsing by Author "Němeček Jan"
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- ItemCombination of nanoscale-zero-valent iron and organic sub-strate stimulation for efficient remediation of co-mingled plume contaminated with Cr(VI) and chlorinated solvents(2016-01-01) Cajthaml Tomáš; Němeček Jan; Pokorný Petr; Lhotský Ondřej; Knytl Vladislav; Najmanová Petra; Steinová Jana; Černík Miroslav; Filipová Alena; Filip Jan
- ItemCombined abiotic and biotic in-situ reduction of hexavalent chromium in groundwater using nZVI and whey: A remedial pilot test(ELSEVIER SCIENCE BV, 2015-01-01) Němeček Jan; Černík Miroslav; Lacinová Lenka; Masopustová Zuzana; Lhotský Ondřej; Pokorný Petr; Cajthaml Tomáš; Filipová Alena
- ItemCombined nano-biotechnology for in-situ remediation of mixed contamination of groundwater by hexavalent chromium and chlorinated solvents(ELSEVIER SCIENCE BV, 2016-01-01) Němeček Jan; Pokorný Petr; Lhotský Ondřej; Knytl Vladislav; Najmanová Petra; Steinová Jana; Černík Miroslav; Filipová Alena; Filip Jan; Cajthaml Tomáš
- ItemDevelopment and testing of in-situ heat-assisted methods anaerobic bioremediation of chlorinated contaminants in a rock environment (Thermo-Bio-Rem)(2017-01-01) Němeček Jan; Knytl Vladislav; Pluhař Tomáš
- ItemDosing system for remediation agents(2015-01-01) Nosek Jaroslav; Lhotský Ondřej; Němeček Jan
- ItemThe effects of hydraulic/pneumatic fracturing-enhanced remediation (FRAC-IN) at a site contaminated by chlorinated ethenes: A case study(Elsevier, 2021-01-01) Lhotský Ondřej; Kukačka Jan; Slunský Jan; Marková Kristýna; Němeček Jan; Knytl Vladislav; Cajthaml Tomáš
- ItemEngineered in situ biogeochemical transformation as a secondary treatment following ISCO e A field test(PERGAMON-ELSEVIER SCIENCE LTD, 2019-01-01) Němeček Jan; Nechanická Magda; Špánek Roman; Eichler František; Zeman Josef; Černík Miroslav
- ItemHydrochemical Conditions for Aerobic/Anaerobic Biodegradation of Chlorinated Ethenes&mdashA Multi-Site Assessment(MDPI, 2020-01-01) Němeček Jan; Marková Kristýna; Špánek Roman; Antoš Vojtěch; Kozubek Petr; Lhotský Ondřej; Černík Miroslav
- ItemIn situ pilot application of nZVI embedded in activated carbon for remediation of chlorinated ethene-contaminated groundwater: effect on microbial communities.(Springer Open, 2020-01-01) Czinnerová Marie; Nguyen Nhung Anh Huynh; Němeček Jan; Mackenzie Katrin; Boothman Christopher; Lloyd Jonathan; Laszlo Tamas; Špánek Roman; Černík Miroslav; Ševců Alena
- ItemIn the Shadow of War. The Protectorate of Bohemia And Moravia, the Slovak Republic, Reichsgau Sudetenland And Other Annexed Czechoslovak Territories in the Years Between 1938/39 And 1945(Ústav pro studium totalitních režimů - Technická univerzita v Liberci, 2019-01-01) Pažout Jaroslav; Portmann Kateřina; Kvaček Robert; Rychlík Jan; Michela Miroslav; Mičko Peter; Baka Igor; Bárta Jan; Bednařík Petr; Fiamová Martina; Hubený David; Sedláková Monika; Jarská Šárka; Kokoška Stanislav; Kratochvíl Jaroslav; Mohn Volker; Němeček Jan; Rákosník Jakub; Sabol Miroslav; Syrný Marek; Vachková Iva
- ItemMaterial to support biological reductive dechlorination in situ(2020-01-01) Lhotský Ondřej; Němeček Jan; Antoš Vojtěch; Marková Kristýna
- ItemMicrobial degradation of chloroethenes: a review(Springer Nature, 2017-01-01) Dolinová Iva; Štrojsová Martina; Němeček Jan; Černík Miroslav; Ševců Alena; Macháčková Jiřina
- ItemNanoscale zero-valent iron application for in situ reduction of hexavalent chromium and its effects on indigenous microorganism populations(ELSEVIER SCIENCE BV, 2014-01-01) Němeček Jan; Cajthaml Tomáš; Lhotský Ondřej
- ItemOther Chemical Reductive Methods(Springer Nature Switzerland AG, 2020-01-01) Němeček Jan; Waclawek Stanislaw Witold; Černík Miroslav
- ItemRemedial agent Biofer-m for stimulation of biogeochemical transformation of chlorinated ethenes in groundwater(2017-01-01) Lacinová Lenka; Němeček Jan; Kozubek Petr
- ItemRemedial technology Biofer-rem for stimulation of biogeochemical transformation of chlorinated ethenes in groundwater(2018-01-01) Němeček Jan; Lacinová Lenka; Kozubek Petr
- ItemStratification of chlorinated ethenes natural attenuation in an alluvial aquifer assessed by hydrochemical and biomolecular tools(Elsevier, 2017-01-01) Němeček Jan; Dolinová Iva; Macháčková Jiřina; Špánek Roman; Ševců Alena; Lederer Tomáš; Černík MiroslavBiomolecular and hydrochemical tools were used to evaluate natural attenuation of chlorinated ethenes in a Quaternary alluvial aquifer located close to a historical source of large-scale tetrachloroethylene (PCE) contamination. Distinct stratification of redox zones was observed, despite the aquifer's small thickness (2.8 m). The uppermost zone of the target aquifer was characterised by oxygen- and nitrate-reducing conditions, with mixed iron- to sulphate-reducing conditions dominant in the lower zone, along with indications of methanogenesis. Natural attenuation of PCE was strongly influenced by redox heterogeneity, while higher levels of PCE degradation coincided with iron- to sulphate reducing conditions. Next generation sequencing of the middle and/or lower zones identified anaerobic bacteria (Firmicutes, Chloroflexi, Actinobacteria and Bacteroidetes) associated with reductive dechlorination. The relative abundance of dechlorinators (Dehalococcoides mccartyi, Dehalobacter sp.) identified by real-time PCR in soil from the lower levels supports the hypothesis that there is a significant potential for reductive dechlorination of PCE. Local conditions were insufficiently reducing for rapid complete dechlorination of PCE to harmless ethene. For reliable assessment of natural attenuation, or when designing monitoring or remedial systems, vertical stratification of key biological and hydrochemical markers should be analysed as standard, even in shallow aquifers.
- ItemThermally enhanced in situ bioremediation of groundwater contaminated with chlorinated solvents; A field test(Elsevier BV, 2018-01-01) Němeček Jan; Steinová Jana; Špánek Roman; Pluhař Tomáš; Pokorný Petr; Najmanová Petra; Knytl Vladislav; Černík MiroslavIn situ bioremediation (ISB) using reductive dechlorination is a widely accepted but relatively slow approach compared to other technologies for the treatment of groundwater contaminated by chlorinated ethenes (CVOCs). Due to the known positive kinetic effect on microbial metabolism, thermal enhancement may be a viable means of accelerating ISB. We tested thermally enhanced ISB in aquifers situated in sandy saprolite and underlying fractured granite. The system comprised pumping, heating and subsequent injection of contaminated groundwater aiming at an aquifer temperature of 20–30 °C. A fermentable substrate (whey) was injected in separate batches. The test was monitored using hydrochemical and molecular tools (qPCR and NGS). The addition of the substrate and increase in temperature resulted in a rapid increase in the abundance of reductive dechlorinators (e.g., Dehalococcoides mccartyi, Dehalobacter sp. and functional genes vcrA and bvcA) and a strong increase in CVOC degradation. On day 34, the CVOC concentrations decreased by 87% to 96% in groundwater from the wells most affected by the heating and substrate. On day 103, the CVOC concentrations were below the LOQ resulting in degradation half-lives of 5 to 6 days. Neither an increase in biomarkers nor a distinct decrease in the CVOC concentrations was observed in a deep well affected by the heating but not by the substrate. NGS analysis detected Chloroflexi dechlorinating genera (Dehalogenimonas and GIF9 and MSBL5 clades) and other genera capable of anaerobic metabolic degradation of CVOCs. Of these, bacteria of the genera Acetobacterium, Desulfomonile, Geobacter, Sulfurospirillum, Methanosarcina and Methanobacterium were stimulated by the substrate and heating. In contrast, groundwater from the deep well (affected by heating only) hosted representatives of aerobic metabolic and aerobic cometabolic CVOC degraders. The test results document that heating of the treated aquifer significantly accelerated the treatment process but only in the case of an abundant substrate.
- ItemThermally Enhanced In-situ Anaerobic Bioremediation of Chlorinated Contaminants(2017-01-01) Němeček Jan; Knytl Vladislav; Pluhař Tomáš
- ItemThermally supported anaerobic bioremediation(2017-01-01) Němeček Jan; Knytl Vladislav; Najmanová Petra; Pluhař Tomáš