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Matis K. A. Zouboulis A. I. Zamboulis D. Valtadorou A. V. 《Water, air, and soil pollution》1999,111(1-4):297-316
Arsenate oxyanions were removed from aqueous solutions by sorption onto synthetic goethite, which was applied as fine particulate suspension during laboratory experiments. The main parameters affecting this treatment process were investigated, namely the concentrations of goethite and of arsenic(V), contact time, temperature, solution pH values and ionic strength variations, and typical adsorption isotherms were calculated. The study of flocculation of goethite particulates in bench scale was subsequently carried out in presence of pentavalent arsenic (being a toxic pollutant), by applying an appropriate optical technique. The flocculation dynamics of dispersed goethite particles was examined, complemented by turbidity and electrophoretic mobility measurements. 相似文献
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Th. A. Ioannidis G. Kaimakamis P. Kavouras C. Hadjiantoniou M. Sofoniou A. I. Zouboulis Th. Karakostas 《Water, air, and soil pollution》2006,176(1-4):201-216
In the current study, the leachability of lead from the PbO-Fe2O3-SiO2-Na2O vitrification system was examined by the application of DIN 38414 S4 and TCLP (Toxicity Characteristic Leaching Procedure) standard leaching tests. Various compositions, containing industrial or artificially created solid waste, were examined. Among the main conclusions from the results obtained was that the initial lead content, expressed as PbO and varied between 4–24% w/w, does not influence directly the release of lead from the vitrified samples. The other oxides, as well as other factors e.g. crystal formation on the glass surface, proved to be more important. Similar data were obtained regarding the content of iron oxide (the initial content of Fe2O3 varied from 30–54% w/w), although in this case the sodium concentrations measured in the leachates were generally found to increase with increasing initial iron oxide content and with the respective formation of crystals. The stoichiometry of lead and sodium, as measured in the leachates, was not constant for all the examined cases, showing that the mechanism of release depends upon the initial compositions and the presence of crystals on the glass surface. Improved results, regarding leachability and homogeneity without the presence of crystallites on the glass surface, were obtained when the initial ratio SiO2/Na2O (% w/w) was 2.33. By maintaining this ratio and when the examined waste was gradually added in the initial composition, the results obtained, concerning sodium concentration and pH values, can be described mathematically, by introducing an appropriate constant factor. 相似文献
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Theodora Angelopoulou Agathoklis Dimitrakos Evangelia Terzopoulou George Zalidis John Theocharis Trajce Stafilov Anastasios Zouboulis 《Water, air, and soil pollution》2017,228(11):436
This study aimed to investigate the potency of soil reflectance spectroscopy in the visible and near infrared (Vis-NIR) spectral regions in estimating soil heavy metal pollution in the western coastal front of Thessaloniki (N. Greece) and how the protocol used for chemical analyses can affect the models’ performance. For this purpose, 49 topsoil samples were collected and the concentrations of Cd, Cr, Cu, and Pb were determined by two different analytical methods, i.e., ISO 11466 based on the technique of atomic absorbance spectrometry (AAS) and ISO 14869-1 using the technique of inductively coupled plasma-atomic emission spectrometry (ICP-AES). The spectral signatures were applied for modeling the metal concentrations by using the partial least squares regression (PLSR) method. To eliminate the “noise” of data and enhance the models’ accuracy, four spectral pre-treatment methods were used. The overall results showed that there is heavy metal pollution in the soils of specific areas in the studied region and that the use of different chemical analytical methods can affect the performance of examined prediction models. Better prediction models were created for the cases of Pb, Cu, and Cr concentrations, which were estimated by the application of ISO 14869-1, while for the case of Cd better prediction models were obtained, by the application of ISO 11466. These results may indicate that soil reflectance spectroscopy can measure the total heavy metal content in soil samples. 相似文献
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The purpose of this research was to determine the efficiency of sand filters to remove several common pollutants, found in most wastewaters. In order to achieve this objective, Plexiglas columns of 1 m height were used. The columns were filled with river sand and loaded with real or synthetic wastewaters, corresponding to different origins, following an intermittent feeding schedule. The effect of addition of inoculum to the synthetic wastewaters was also examined and the results were compared with the uninoculated columns. The inoculum consisted of 20 ml addition of activated sludge from the aeration tank of a large-scale wastewater treatment plant. Samples of the inlet and outlet of these columns were analyzed for common parameters (TSS, COD, NH4-N, NO2-N, NO3-N, TN, PO4-P and pH). At the end of each experimental serie, sand samples from different column heights were obtained and observed, using a Scanning Electron Microscope (SEM). The SEM micrographs demonstrated the existence of microorganisms through out the column depth. The analysis of effluent show significant reduction of COD (more than 50% for the majority of wastewaters that were used) and PO4-P (more than 40%), as compared with the initial loading. Ammonification occurred and by increasing the number of loadings, nitrification was subsequently observed. Denitrification was not found to take place, due to the lack of anoxic conditions. 相似文献
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