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Optimization of laboratory denitrification test
Novotná, Klára ; Pániková, Kristína (referee) ; Malá, Jitka (advisor)
Leaching from agricultural fields not only releases high concentrations of nitrates into surface and groundwater, but also, for example, pesticides. The aim of this bachelor thesis is to optimize the input nitrate concentration of a laboratory denitrification test. This test will allow the study of the influence of different pesticides on the denitrification process and also the monitoring of their fate during this process. The theoretical part of the thesis describes the nitrogen cycle and its forms, the denitrification process and the factors that influence its progress are discussed in detail. In the practical part, a 28-day laboratory denitrification test was performed. Analytical methods used are described in the thesis as well as the process and the results of the laboratory experiment. Based on chemical oxygen demand profile, N-NOx concentration profile and denitrification rate, an input nitrate concentration of 15 mg.l-1 was recommended.
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Optimization of laboratory denitrification test
Novotná, Klára ; Pániková, Kristína (referee) ; Malá, Jitka (advisor)
Leaching from agricultural fields not only releases high concentrations of nitrates into surface and groundwater, but also, for example, pesticides. The aim of this bachelor thesis is to optimize the input nitrate concentration of a laboratory denitrification test. This test will allow the study of the influence of different pesticides on the denitrification process and also the monitoring of their fate during this process. The theoretical part of the thesis describes the nitrogen cycle and its forms, the denitrification process and the factors that influence its progress are discussed in detail. In the practical part, a 28-day laboratory denitrification test was performed. Analytical methods used are described in the thesis as well as the process and the results of the laboratory experiment. Based on chemical oxygen demand profile, N-NOx concentration profile and denitrification rate, an input nitrate concentration of 15 mg.l-1 was recommended.
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The Behaviour of Atrazine under Denitrification Conditions
Pániková, Kristína
Atrazine is one of the most persistent pesticides. This substance negatively affects the environment and the human body. It is a frequent contaminant of groundwater, in which ideal conditions for the denitrification process prevail. Using a methodology of long-term testing, atrazine was investigated under denitrification conditions, as well as its transformation behaviour and effect on the denitrification process itself. After 28 days, adsorption on poplar shavings was observed as the dominant process, 30.6%. A biotic loss of 9.8% was found, and, at a concentration of 0.1 mg/l, atrazine did not significantly affect the denitrification process. Stimulation reached the value of 6.9%.
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