Our work was focused on investigation of different treatment procedures for the removal of toxic fractions from a landfill leachate. The applied methods were air stripping, adsorption to activated carbon and zeolite clinoptilolite and Fenton oxidation. Air stripping at pH 11 was a viable treatment option for the removal of ammonia nitrogen (up to 94%) and reduction of toxicity to microorganisms. In the column experiments with clinoptilolite 45/93/100% of NH4+-N as well as 25/32/39% of COD removal was attained. Fenton oxidation at molar ratio Fe2+:H2O2 = 1.0:10.0 assured 70-85% removal of COD.
COBISS.SI-ID: 33885701
A method is proposed for on-line UV spectroscopy and data analysis are applied to determine nitrate and nitrite nitrogen (NOx-N) in various waste water matrices. Comparison with standard analytical method was performed. Sensor calibration with pure substance reference materials delivered sufficient resuls for characteristic municipal waste water matrix, but for waste water with substantual industrial contribution and for landfill leachate matrix match calibration was required to enhance trueness. The described method concept is well suited for on-line monitoring.
COBISS.SI-ID: 33738245
Presented research has been focused on the effectiveness of degradation of natural (17ß-estradiol – E2) and synthetic (17?-ethinylestradiol – EE2) hormones with Fenton’s oxidation. The ratio among degradation and adsorption of estrogens on sludge during oxidative treatment was determined. It depends upon the molar ratio of reagents, reaction time and initial concentrations of the investigated estrogens. The most efficient removal of E2 was achieved at 1:33 molar ratio of reagents (100%, 26–50% adsorption) while EE2 removed efficiently at 1:10 and 1:33 ratios (99–100%, 20–76% adsorption).
COBISS.SI-ID: 33808389
This review paper is a result of an 8 year survey on the use of biochemical biomarkers for the purposes of environmental risk assessment. Most importantly, for successful application of each group of biomarkers, their intrinsic properties need to be known before an ecotoxicity study is designed. We suggest that a substantial body of experience obtained with biochemical biomarkers should be exploited to new emerging biomarkers, such as proteomic or genomic responses in order to facilitate their application.
COBISS.SI-ID: 1952847
Nanostructured mesoporous CuO-CeO2 mixed oxide catalysts were prepared by hard template method and tested in ethanol steam reforming and methane dry reforming reactions. It was discovered during ethanol steam reforming that increasing CuO content is favorable in terms of ethanol conversion. Reaction temperatures in excess of 550° C strongly promoted ethanol dehydratation reaction. Temperatures over 450° C are required for any noticeable CO2 and CH4 conversion in methane dry reforming reaction. The examined materials displayed steady performance during stability tests at temperature of 650° C.
COBISS.SI-ID: 4378906