The article highlights the potential of brownfield areas in the sense of the rules and principles of sustainable development of the regions which shows significant disparities determined by the developmental tendencies of the socio-economic and environmental spheres, whose interactions were its basic platform in the Slovak Republic in the last years. Brownfield areas, with a degree of degradation and environmental quality depending on their type and original use, have a negative impact on all mentioned spheres of regional development, since such sites are unused and represent so-called brown investments, i.e. areas from which the region has no benefit. From the explicitly defined positive and negative determinants of the actual occurrence of brownfield areas in terms of sustainable development of the regions, the article quantifies their prioritization in the process of implementation into the regional development model, accepting the principles of Saaty matrix which is objective from a process perspective of sustainable regional development. Based on the explicit quantification of the above-mentioned determinants, the categorization of brownfield areas in the process of sustainable regional development, including the model of regional development with implemented brownfield sites, whose actual occurrence supports the occurrence of diversified activities, reduces the price of the surrounding land and ultimately threatens the health of the affected population and reduces the price of surrounding lands.
The paper deals with solutions of brownfields in Slovakia in the context of the regional development. It refers to the potential that brownfields have for the benefit of further development at not only local but also at regional level in order to create aesthetically and ecologically balanced environment and landscape. It also shows the interaction of revitalization and subsequent reuse of brownfields in order to minimize regional disparities in the territory of the Slovak Republic.
In this study, the adsorption of Fe(III) from aqueous solution on zeolite and bentonite was investigated by combining batch adsorption technique, Atomic adsorption spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy analyses. Although iron is commonly found in water and is an essential bioelement, many industrial processes require efficient removal of iron from water. Two types of zeolite and two types of bentonite were used. The results showed that the maximum adsorption capacities for removal of Fe (III) by Zeolite Micro 20, Zeolite Micro 50, blue bentonite, and brown bentonite were 10.19, 9.73, 11.64, and 16.65 mg.g−1, respectively. Based on the X-ray photoelectron spectroscopy (XPS) and X-ray fluorescence (XRF) analyses of the raw samples and the solid residues after sorption at low and high initial Fe concentrations, the Fe content is different in the surface layer and in the bulk of the material. In the case of lower initial Fe concentration (200 mg.dm−3), more than 95% of Fe is adsorbed in the surface layer. In the case of higher initial Fe concentration (4000 mg.dm−3), only about 45% and 61% of Fe is adsorbent in the surface layer of zeolite and bentonite, respectively; the rest is adsorbed in deeper layers.
The influence of membrane type on the permeate flux in microfiltration of two sorbents Bentonite a natural sorbent, montmorillonite based clay and Lewatit S1468 a synthetic sorbent, styrene-divinylbenzene based copolymer was studied. Two types of membranes, single-and multi-channel, both asymmetric inorganic ceramic membranes based on α-Al2O3, were used. The experimental data were obtained by continuous microfiltration equipment. According to the results use of multi-channel membrane has more advantages higher permeate flux, lower energy consumption, and lower flow rate than disadvantages longer time period to reach the steady state and higher pressure loss.
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