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Problematic of behaviour of APC residues from metallurgical recycling of Pb in soil environment
Vrtišková, Růžena ; Strnad, Ladislav (referee)
Fly ashes from the metallurgical processing of Pb represent the main pollution source of soils in the vicinity of the smelters. The purpose of this thesis was to determine the leaching behaviour of the metallurgical fly ash in simulators of soil solutions - low-molecular-weight (LMW) organic acids. Batch leaching experiment was performed in the time span of 168 hours, at the solid-to-liquid ratio of 1/10 and in 500 µM solutions of organic acids (acetate, oxalate and citrate). In the leachate of acetate and oxalate were measured high concetration of heavy metals as Pb, Cd and Zn. Whereas the leaching efficiency of citrate was lower due to higher pH of suspensions, which is the main factor in this leaching process. According to the calculations using the PHREEQC-2 program the amount of Pb and Cd organic complexes in the leachate are minor (0,1 - 2,1%). Suprasing is the amount of organics complex of Zn and Cu (ZnCitrate- , CuCitrate- ), which is expected to be less mobile due to sorption onto positively charged surface of hydrous ferric oxides and organic matter. As far as acetate and oxalate are concerned, Pb concentrations at the end of experiment are controlled by precipitation of solid Pb acetate and oxalate. This phenomenon can represent a key mechanism of Pb immobilisation in soil systems, in...
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Influences which have effect on the weight of lambs in the age of 100 days of breed texel
STRNAD, Ladislav
The aim of this bachelor thesis was to evaluate chosen influences which have effect on the weight of lambs in the age of 100 days of breed texel. The evaluation was done in 2014 and 283 lambs was include in it. The observed effects were sex, line of ram, the month of birth and litter size of lambs. From the point of view of the influence of sex lambs male achieved the average weight of 33,7 kg in the age of 100 days and female 30,9 kg. From the point of view of the line of ram lambs of line TONDA (38,7 kg) and lambs of line TARTE (34,1 kg) achieved the highest values. The lambs of line TREFLE (30,1 kg) and lambs of line TUTU (30,1 kg) achieved the lowest values. From the point of view of the month of birth the lambs born in June (34,7 kg) and in March (33,1 kg) achieved the highest values. The lambs born in April achieved the lowest values (31 kg). From the point of view of the litter size singles achieved the highest values (34,8 kg). The lambs of triplet achieved the lowest values (29,7 kg). At the observed effects was found that the influence of sex, the month of birth, the line of ram and litter size had an effect on the weight of lambs in the age of 100 days.
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