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Gruiz K.,Budapest University of Technology and Economics | Molnar M.,Budapest University of Technology and Economics | Fenyvesi E.,CycloLab Cyclodextrin RandD Laboratory Ltd. | Hajdu Cs.,Budapest University of Technology and Economics | And 2 more authors.
Journal of Inclusion Phenomena and Macrocyclic Chemistry | Year: 2011

Experimental results, which may serve as basis for innovative applications of cyclodextrins (CDs) in environmental technologies, are presented here. Some newly developed CD-aided tools are used in sampling, measuring the concentration or testing the effect of contaminants in water and soil. The innovative methods such as the bacterial bioassays with CD-increased sensitivity or the CD-filled absorptive samplers for air and water sampling are utilised in environmental exposure, hazard and risk assessment. Technological developments aim the reduction of the risk of chemical substances in waters and soils. CD-aided environmental remediation is introduced through examples for the elimination of organic contaminants from water by CD-filters, and for the enhancement of the mobility and availability of soil contaminants in this way increasing the efficiency of soil remediation by water extraction, chemical oxidation, biodegradation, etc. © 2010 Springer Science+Business Media B.V. Source


Hajdu C.,Budapest University of Technology and Economics | Gruiz K.,Budapest University of Technology and Economics | Fenyvesi E.,CycloLab Cyclodextrin RandD Laboratory Ltd. | Nagy Z.M.,Budapest University of Technology and Economics
Journal of Inclusion Phenomena and Macrocyclic Chemistry | Year: 2011

Based on our former experience on contaminant solubilisation and mobilisation in the process of soil remediation we used cyclodextrins as additives in environmental bioassays, for improving solubility and bioavailability of the contaminant in soil and as a consequence sensitivity of the bioassay. In this article we introduce the findings on the application of RAMEB (randomly methylated β-cyclodextrin) for testing PCP (pentachlorophenol) in soil, in three bioassays: bacterial luminescence- inhibition test with Vibrio fischeri, protozoon growth inhibition test with Tetrahymena pyriformis, and Ames mutagenicity test. We applied RAMEB which has a high solubilising capacity on many typical soil contaminant and PCP, because contradictory results were published for its toxicity and mutagenicity. The RAMEB-aided Ames test, gave a sudden and expressed increase in the mutagenicity of PCP, however, Ames mutagenicity was negative without cyclodextrin (CD). Based on these results we tried to apply RAMEB for increasing sensitivity of other bioassays, such as acute toxicity tests with different test organisms. According to our results the effect of RAMEB on bioavailability and toxic effect depends not only on the K ow value (octanol-water partition coefficient) of the chemical substances, but also on the test organism, the water-content of the test-matrix and the applied concentration of RAMEB, as well as its ratio to PCP. We collected all the characteristics of the bioassays applied for PCP and some other contaminants and showed the measured effect data in comparison with each other. We found that in the complex system of soil and soil suspension, used in the bioassays, the interactions between soil solid, water and gaseous phases, as well as between the test organism and RAMEB result in K ow dependent partition of the contaminant between solid and water phases of soil, RAMEB, and the test organism. The conclusion is that RAMEB undoubtedly has an influence on the fate and behaviour of the contaminant in soil and soil suspensions, and the direction of the RAMEB-induced changes depends on the effective concentration of the RAMEB in the bioassay, the time of contact, the type of test organism, and the characteristics of the RAMEB-contaminant complex. In those cases, when RAMEB increased the effect of a contaminated environmental sample, this CD-induced increase can be considered as a "realistic worse case" situation, which can be very useful in risk assessment, resulting in a moderate overestimate in the value of environmental risk. © 2010 Springer Science+Business Media B.V. Source


Gruiz K.,Budapest University of Technology and Economics | Molnar M.,Budapest University of Technology and Economics | Fenyvesi E.,CycloLab Cyclodextrin RandD Laboratory Ltd.
Construction for a Sustainable Environment - Proceedings of the International Conference of Construction for a Sustainable Environment | Year: 2010

Within the frame of Hungarian MOKKA project a comprehensive and uniform remediation technology-verification system was developed and applied which facilitates better understanding and evaluation of the remediation technologies and is able to increase trust in remediation, including in situ biotechnologies. The feasibility of the MOKKA multistage technology-verification system has been demonstrated in three innovative in situ remediation cases in Hungary. The comprehensive verification system was applied to the detailed characterisation and evaluation of an in situ complex cyclodextrin-enhanced remediation technology (CDT). The cyclodextrin-enhanced bioremediation is an innovative remediation technology developed and used for soil contaminated with hydrocarbons of limited bioavailability. The feasibility of the CDT was demonstrated in the field and the developed innovative tools for the verification of the technology proved the efficiency and the competitiveness of the technology. © 2010 Taylor & Francis Group, London. Source


Nagy Z.M.,Budapest University of Technology and Economics | Molnar M.,Budapest University of Technology and Economics | Fekete-Kertesz I.,Budapest University of Technology and Economics | Molnar-Perl I.,Eotvos Lorand University | And 2 more authors.
Science of the Total Environment | Year: 2014

Small scale laboratory experiment series were performed to study the suitability of a cyclodextrin-based sorbent (ß-cyclodextrin bead polymer, BCDP) for modelling the removal of micropollutants from drinking water and purified waste water using simulated inflow test solutions containing target analytes (ibuprofen, naproxen, ketoprofen, bisphenol-A, diclofenac, β-estradiol, ethinylestradiol, estriol, cholesterol at 2-6. μg/L level). This work was focused on the preliminary evaluation of BCDP as a sorbent in two different model systems (filtration and fluidization) applied for risk reduction of emerging micropollutants.For comparison different filter systems combined with various sorbents (commercial filter and activated carbon) were applied and evaluated in the filtration experiment series.The spiked test solution (inflow) and the treated outflows were characterized by an integrated methodology including chemical analytical methods gas chromatography-tandem mass spectrometry (GC-MS/MS) and various environmental toxicity tests to determine the efficiency and selectivity of the applied sorbents.Under experimental conditions the cyclodextrin-based filters used for purification of drinking water in most cases were able to absorb more than 90% of the bisphenol-A and of the estrogenic compounds. Both the analytical chemistry and toxicity results showed efficient elimination of these pollutants. Especially the toxicity of the filtrate decreased considerably.Laboratory experiment modelling post-purification of waste water was also performed applying fluidization technology by ß-cyclodextrin bead polymer. The BCDP removed efficiently from the spiked test solution most of the micropollutants, especially the bisphenol-A (94%) and the hormones (87-99%). The results confirmed that the BCDP-containing sorbents provide a good solution to water quality problems and they are able to decrease the load and risk posed by micropollutants to the water systems. © 2014 Elsevier B.V. Source


Fekete-Kertesz I.,Budapest University of Technology and Economics | Molnar M.,Budapest University of Technology and Economics | Atkari A.,WEPROT Ltd. | Gruiz K.,Budapest University of Technology and Economics | Fenyvesi E.,CycloLab Cyclodextrin RandD Laboratory Ltd.
Periodica Polytechnica: Chemical Engineering | Year: 2013

In this paper we present the remediation possibilities of a trichloroethylene contaminated site of a former metalworking plant in Hungary, where high TCE concentration (150 μg/L to 35.000 μg/L) was detected in the groundwater. Lab-scale experiments were performed to compare the potential bioremediation technology-alternatives eg.: enhanced biodegradation; pump & treat by UV irradiation (photodegradation); in situ chemical oxidation (ISCO) applying different oxidants (KMnO4, Na2S2O8and H2O2). The lab-scale experiments showed in all cases reduction of the TCE-concentration of the water. Comparing the removal efficacy and concerning the time requirement ISCO was the most effective in laboratory studies. Source

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