Technické aspekty regenerace brownfields

Abstract

Technical regeneration of brownfields consists not only of building remediation but also of solving potential contamination on these sites. To eliminate pollutants from brownfields should be priority mainly to protect human health and support the quality of environment. Choice of the appropriate remediation method is part of the successful technical regeneration of brownfields. Dissertation thesis is focused on verification of hypotheses: “Verification of the possible usage of remediation technology phytoextraction of toxic metals from soils by using technical hemp (Cannabis sativa L.)”. Phytoextraction refers to uptake of contaminants from soil or water by plant roots and their translocation to any harvestable plant part. Phytoextraction is cost-effective method; application of this method doesn’t require any difficult technical support and is ecological friendly. Technical hemp has several advantages as: plant is originally from Czech Republic, its agro -technology is completely known, technical hemp is able to accumulate toxic elements from soil, and it is high biomass plant. To verify initial hypotheses basic steps should be given. In the first phase concrete type of the soil – sampled in industrial brownfield – according to the hemp ability to grow on was chosen. The crucial step - Application of the phytoextraction technology in situ was done in the second phase. Third part consists of two types of analysis. The first one was analysis of the sampled soil to obtain its chemical properties and determination of bioavailable elements in the soil to be accumulated by the plant. Second analysis was focused on the plants which were grown on the contaminated soil. The aim of this analysis was: first to detect elements in the plants issue by qualitative method and second to determine concrete concentration of those elements in whole plant C. sativa L. Results from the first qualitative analysis shows that C. sativa was able to accumulate some elements which are conventionally considered as toxic metals: barium, zinc, copper, cadmium and lead. And also others which are not naturally in plant issues: titanium, tantalum, and aluminum. Quantitative analysis determine in certain concentration following elements: zinc, copper, cadmium, lead. According to the all gained results it can be concluded that the initial hypothesis: „Using the technology phytoextraction of the toxic metals from soil using technical hemp (Cannabis sativa L.)“ can be verified.