National Repository of Grey Literature 161 records found  beginprevious152 - 161  jump to record: Search took 0.01 seconds. 
Application of fluidized layer of granular material in water treatment
Čuda, Jan ; Pitter, Pavel (referee) ; Benešová, Libuše (advisor)
Chemical treatment is the most often method used in water treatment in the Czech republic. It is based on dosage of destabilisation reagent into raw water, formation of separable aggregates and their separation by sand filtration. Waterworks optimalisation is predominantly carried out by change of the chemical parameters, typically by change of destabilisation reagent dose. Physical parameters in water treatment like the magnitude of the velocity gradient and period of its duration are undervalued commonly, although they have crucial effect on quality of the aggregates. Character of the aggregates (size, density, compactness) influence their separability. This study aims at evaluation of influence of the magnitude of the velocity gradient on quality of suspension formed. Infuence of stirring intensity was performed on the pilot plant situated in the Želivka waterworks, which is fed from Švihov reservoir. The pilot plant worked at two modes: 1) slow stirring by perforated baffles and 2) fast stirring by fluidised layer of granular material. Fast stirring was either aggregational (served only as stirring element), or separational (separation of aggregates proceed already in the fluidised layer) Infuence of the magnitude of velocity gradient was evaluated by aggregation test. Seperation effectivity...
Case study - biogas plant Úpice
Přidal, Štěpán ; Pastorek, Zdeněk (referee) ; Benešová, Libuše (advisor)
In this work, a full-scale biogas plant (electrical installed capacity of 150 kW) located in Úpice near the city of Trutnov was monitored and assessed. The input materials of this plant are sewage sludge and different types of organic wastes. The samples of solid digestate were regularly taken between December 2008 and December 2009 and they were analysed for the content of toxic substances. Data concerning the amounts of particular input materials and the production of biogas were obtained directly from the operator of the plant. In order to reveal, if there is a relationship between the amount of particular input material and the production of biogas, a multiple linear regression was used. Finally, an overall assessment of the biogas plant was also implemented. The results of chemical analyses showed the digestate fulfills the norms given by the Czech legislation and thus can be certified and put on the market. Potentially problematic substances that should be monitored in the future are zinc and PAHs. A multiple linear regression identified "a gut fillings" and "silage" as the most suitable substrates for the biogas production in this plant. However, the value of r2 coefficient was quite low (r2 ~ 0,73), so we cannot say there is a clear relationship between the amounts of particular input...
Optimalization of the coagulation process of surface water with high content of aluminium and natural organic matter
Pivokoňská, Hana ; Benešová, Libuše (advisor) ; Komínková, Dana (referee) ; Pitter, Pavel (referee)
7 ABSTRACT The submitted doctoral thesis deals with the optimisation of chemical treatment process of water with the high concentration of aluminium and natural organic matter (NOM). Natural organic matter in connection with the higher concentration of natural aluminium is the common components of some surface water in the Czech Republic. The high aluminium in water reservoirs can lead to the higher concentration of residual aluminium in drinking water and then it can cause some health problems. Both of these components can be removed from drinking water by chemical treatment process based on the destabilisation and the aggregation. Chemical treatment aims at the formation of aggregates that are separable by filtration through a layer of granular media. The efficiency of the NOM and Al removal is influenced by many chemical and physical factors (the reaction conditions under which the aggregation takes place, the type and dosage of destabilisation reagent, the reaction pH value, the mean velocity gradient, and the period of its duration). For this reason it is very important to optimise the condition of water treatment. The main problem is inadvisable type and dose of the reagent and unsuitable intensity and duration of mixing. Common water treatment technologies are based only on the reagent doses...

National Repository of Grey Literature : 161 records found   beginprevious152 - 161  jump to record:
See also: similar author names
21 BENEŠOVÁ, Lenka
27 BENEŠOVÁ, Lucie
4 BENEŠOVÁ, Ludmila
21 Benešová, Lenka
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4 Benešová, Ludmila
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