|
|
Determination of the viscosity of various types of wastewater
Glombová, Pavla ; Rusník,, Igor (referee) ; Hluštík, Petr (advisor)
The aim of this diploma thesis is a description of viscosity as a physical characteristic of liquids, next a description of projecting different types of sewer systems (pressure sewer system, vacuum sewer system and gravity sewer system). There was a range of density and viscosity of wastewater experimentally determined. These values were compared with ordinary values used in practice. The practical part of this work consists of sampling wastewater from different types of sewer systems and various localities. Chemical-biological analysis was realized on those samples with defined density, then dynamic viscosity was measured by the rotary viscometer for various temperatures. Measured data are evaluated. Finally, a calculation related to the design of sewers was made.
|
|
|
The floating islands technology for wastewater treatment
Kohut, Rafael ; Hyánková, Eva (referee) ; Kriška-Dunajský, Michal (advisor)
Importance of proper water treatment is well described in the European Water Charter. However, considering incessant population growth and role of water as a key raw material in all industries and agriculture, we can say that its availability and quality is endangered. To improve the quality of water and water ecosystems, the strategy of renewal of wetlends is being presented as relevant. Except for natural wetlands there is also a variety of artificial ones, which are trying to simulate because of their treatment conditions. This is one of the main reasons why application of floating wetlands raises a great interest nowadays. In at least seventeen countries all around the world the surveys were conducted to define efficiency of this method for purifying of waters. Despite these efforts, the assesment of the reliable evaluations still remains a large research gap. The purpose of this thesis is to present and describe results of a month´s measurements of efficiency of usage of floating wetlands for refinig of wastewater stabilization pond of root zone wastewater treatment plant in the climatic conditions of the Czech Republic.
|
|
|
Pollution produced carp general, depending on the fullness of the digestive tract.
HAVLÍNOVÁ, Šárka
The aim of my bachelor thesis was to determine and compare the differences in the levels of pollution produced by fish through their metabolic activities depending on the fullness of their digestive tract. The pollution production was detected in 4 groups of fry of the common carp: 1) the fish had no access to food for 2 days before the beginning of the experiment; 2) the fish did not eat for 10 days before the beginning of the experiment; 3) the fish had a limited food intake (pellets KP1) before the beginning of the experiment; 4) the fish accepted spontaneously feed (2% by weight of the stock). The experiments were carried out in laboratory conditions. In the beginning of the experiment, the fish of individual groups and known weight were placed in experimental aquariums filled with 20 l of tap water. The experiments took 24 hours and after that the fish were moved back into its origin tank. Water from the experimental aquariums was filtered through a screen with 40 micrometr mesh size. Both, filtered water ("aqueous phase excrements") and solids ("solid phase excrements") were analysed. Solids were analysed for a content of dry matter, total phosphorus (P) and nitrogen (N). Filtered water was analysed for a concentration of suspended solids, total nitrogen, total ammonia, total phosphorus, chemical oxygen demand (CODMn, and CODCr) and biochemical oxygen demand (BOD5). Aqueous phase excrements was filtered again through a glass filter (1.2 micrometr) and the filtrate was analysed for concentration of ammonia nitrogen [N (NH3 + NH4+)], nitrate nitrogen [N-NO3-] and orthophosphate phosphorus [P-PO43-]. Pollution detected in solids and in filtered water was related to 1 kg of live weight of fish per day. The parameters characterizing pollution excreted by fish achieved in the 4th group i.e. fish, which accepted spontaneously feed the highest values. The fish of this group secreted on average of 4,154 mg.kg-1.day-1 of suspended solids (particles 1.2 micrometr), 105,5 mg.kg-1.day-1 of total phosphorus and 1,342 mg.kg-1.day-1 of total nitrogen. In the aqueous phase excrements, there was detected on average of 637 mg.kg-1.day-1 of ammonia nitrogen 4.9 mg.kg-1.day-1 of phosphate phosphorus.4,561 mg.kg-1.day-1 of CODCr, 2,634 mg.kg-1.day- 1 of BOD5. The values detected in the other groups were times lower.
|
|
|
Determination of the viscosity of various types of wastewater
Glombová, Pavla ; Rusník,, Igor (referee) ; Hluštík, Petr (advisor)
The aim of this diploma thesis is a description of viscosity as a physical characteristic of liquids, next a description of projecting different types of sewer systems (pressure sewer system, vacuum sewer system and gravity sewer system). There was a range of density and viscosity of wastewater experimentally determined. These values were compared with ordinary values used in practice. The practical part of this work consists of sampling wastewater from different types of sewer systems and various localities. Chemical-biological analysis was realized on those samples with defined density, then dynamic viscosity was measured by the rotary viscometer for various temperatures. Measured data are evaluated. Finally, a calculation related to the design of sewers was made.
|
|
|
The floating islands technology for wastewater treatment
Kohut, Rafael ; Hyánková, Eva (referee) ; Kriška-Dunajský, Michal (advisor)
Importance of proper water treatment is well described in the European Water Charter. However, considering incessant population growth and role of water as a key raw material in all industries and agriculture, we can say that its availability and quality is endangered. To improve the quality of water and water ecosystems, the strategy of renewal of wetlends is being presented as relevant. Except for natural wetlands there is also a variety of artificial ones, which are trying to simulate because of their treatment conditions. This is one of the main reasons why application of floating wetlands raises a great interest nowadays. In at least seventeen countries all around the world the surveys were conducted to define efficiency of this method for purifying of waters. Despite these efforts, the assesment of the reliable evaluations still remains a large research gap. The purpose of this thesis is to present and describe results of a month´s measurements of efficiency of usage of floating wetlands for refinig of wastewater stabilization pond of root zone wastewater treatment plant in the climatic conditions of the Czech Republic.
|
|
|
The influence of fishery farming intensity on water quality in ponds
KREJČÍ, Filip
The introductory part deals with the history of czech fish farming and there is given further information on selected quality parameters of pond water, which are important and risky in terms of fishery production. The main part of the thesis summarises data from the literature, final reports and RIFCH (The research institute of fish culture and hydrobiology) Vodňany database is processed in a form of tables and graphs for clear presenting of physiochemical properties of pond water, including brief details about the way of fish farming, eventually about other important factors, which could also affect the water quality. The main data source of my thesis were four projects, which dealt with this issue during a relatively long period of time, from the seventies of the last century until the year 2012. The greatest attention was paid to data gained under NAZV QH-82113 project "Careful and effective fish farming with maximal utilization of current trophic potential and keeping of sufficient water quality and fish production" in the years 2008-2012 at experipentals ponds of RIFCH Vodňany. There was a comprehensive set of data gained from semi-intensive conditions, where working multiple times and in a very well comparable and under well documented conditions (size of ponds, water supply, fish farming methods) was possible. Based on some published data and data obtained from VÚRH Vodňany database, it was able to demonstrate a direct influence of the size of initial stocking density on the water quality of ponds (especially the concentration of suspended solids, volume of organic pollutions and the total concentration of a phosphor). Generally, parameters, which often do not comply with legislative requirements, could be described as suspended solids, concentration of oxygen, ammonium, total phosphor and Biochemical oxygen demant (BOD5) and Chemical oxygen demant (CODMn or CODCr) values, whose values are sometimes influenced by factors such as for instance the history of a pond, other than production usage of the pond in the previous period (deponie of waste from livestock production, recreational activities etc.)
|
|
|
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.
|
guest ::
