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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Fish farming in biofloc system
 LUNDA, Roman
The aim of this diploma thesis has been to establish and to verify functionality of a model biofloc system for Nile tilapia (Oreochromis niloticus) farming. The main criteria to be observed during the experiment were chemical characteristcs of the water, development of the biofloc microflora and the reaction of the system to technological interventions. The experiment has consisted of two phases. The first phase monitored an insufficiently functioning system. Due to unsatisfactory assurance of the oxygen concentration as well as the water column stirring, 4 different types of air-sourcing devices have been used in the experiment. For assuring of the perfect stirring and of the sufficient oxygen concentration ( 6 mg×l-1) an airlift fulfilling both the criteria has been constructed. The impact of the carbohydrates application on the decrease of the amonia nitrogen has been sucessfully verified during the experiment. The average value of the C/N ratio of 14 has been reached thanks to the quantity of flour being added as the carbohydrate source into the system. When the recommended amount of TSS (200 ml×l-1) with the corresponding biofloc microflora that has been transforming all the nitrogen in the experiment tank into the microbial protein, the system was evaluated as fully functional. During the biofloc analysis, the presence of N-substances at the amount of 223.6 g at all of the experiment tank (1300 l) has been detected. In the comparison with the applied feed material at the amount of 300 g containing 39% of the N-substances, only 67.1 g of the N-substances has been added into the system. The biofloc (bacterial flakes) serves as food for the tilapia during the entire period of the functional system.
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Function of the root wastewater treatment in case of two wastewater treatment stations in Třeboň Biosphere Reserve.
 MUNDOKOVÁ, Mariana
The Bacherlor´s thesis monitors the concentrations of certain chemicals in waste water. The locations of this testing operation were Příbraz, a constructed wetland that has been operating for nine years and Rosec also a constructed wetland in testing operation. This project shows the physical construction and the function of constructed wetlands. It also reports on the levels of the BOD 5, COD and TSS. From our monitoring records the efficiency for BOD 5, COD and TSS has been steady over the study period for both locations. Only once for a period of four months outflow concentration of TSS was higher the due to increased inflow of constucted wetland TSS at the Roseč.
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