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Coagulation of organic matter produced by phytoplankton
Načeradská, Jana ; Pivokonský, Martin (advisor) ; Benešová, Libuše (referee) ; Janda, Václav (referee)
This dissertation thesis focuses on the removability of algal organic matter (AOM) by coagulation during water treatment and also on the influence of AOM on the coagulation of other substances present in source water. Special emphasis is put on the description of coagulation mechanisms. The effectiveness of AOM removal by coagulation was investigated by coagulation tests performed with optimized doses of coagulants (aluminium or ferric sulphate) under different pH values. Peptides and proteins contained in cellular organic matter of cyanobacterium Microcystis aeruginosa were used in the experiments since they have been previously reported to disturb the coagulation process. Moreover, peptides and proteins underwent coagulation experiments together with kaolin particles, representing clay particles in turbid waters, in both the presence and absence of coagulants to investigate the effect of AOM on the coagulation of turbid waters. To enable the description of coagulation mechanisms, AOM were characterised in terms of charge, functional groups, molecular weight and ability to form dissolved complexes with coagulant metals. The experimental results demonstrated that the removability of peptides and proteins is greatly dependent on pH value and on the properties of the involved particles or molecules....
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Influence of compounds produced by cyanobacteria on coagulation of humic waters
Brabenec, Tomáš ; Pivokonský, Martin (advisor) ; Benešová, Libuše (referee)
The diploma thesis investigates the coagulation of nature waters with humic substances and peptides/proteins produced by Microcystis aeruginosa during water treatment process with aluminum coagulants. It was confirmed that the efficiency of coagulation mechanism of humic substances and peptides/proteins strongly depends on the pH value, because pH value is limited factor of a charge properties of peptides/proteins, humic substances and hyrolysis products of coagulants. The optimal pH range for the coagulation of humic substances was 5- 6 and for cyanobacterial peptides/proteins 5-6.5. In both cases a charge neutralisation and an adsorption were dominant mechanism of coagulation. Optimal pH range for the coagulation of humic substances in the presence of cyanobacterial peptides/proteins was identical as well as optimal pH range of humic substances with absence of peptides/proteins (5-6) but the presence of peptides/proteins positively influenced particle coagulation of humic substances, because the optimal concentration of the coagulants decreased to more than half. An interaction between humic substances and peptides/proteins was demonstrated. A positive effect of coagulation was observed in the case of jar tests with absence of coagulants at a very low pH range (<4). Keywords Humic substances; AOM...
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Use of polymers for drinking water treatment
Filipenská, Monika ; Benešová, Libuše (advisor) ; Pivokonský, Martin (referee)
Sources of drinking water are limited. It is clear that the need for quality drinking water is rising. Therefore, it is necessary to continuously improve methods to ensure sufficient quantity sanitary water. Coagulation-flocculation process is very often used in drinking water treatment. Except drinking water supply is coagulation used in waste treatment to wastewaters, landfill leachate and other contaminated water. Coagulation is mediated by coagulants - they have the ability to suppress the repulsive forces between the particles so that they can join in a contact in larger particles called flocs. Large and compact flocs are easily separated from the treated water. For this purpose have been used inorganic salt for long time. Most commonly salts of aluminum and iron. However, their effectiveness is not sufficient and their use also brings other disadvantages. By using aluminum compounds also discouraged, because aluminum may have link with Alzheimer's disease. Therefore, there were developed new coagulants based on organic polymers. These polykoagulants are significantly more efficient in cleaning. Their properties are easily influence by the content of their substances. For the water treatment used them much smaller dose than inorganic coagulants and so there is even less sludge and reduce...
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Modelling of surface water pollution in Krivoklatsko protected area using GIS
Šereš, Michal ; Matějíček, Luboš (advisor) ; Benešová, Libuše (referee)
Environmental modelling is lately becoming to be one of the most important decision support systems. Hydrological models present significant potential for use especially in area of surface and groundwater protection. In the diploma thesis, the Soil and Water Assessment Tool (SWAT) was used to evaluate nitrate surface water pollution in nine catchments situated in Křivoklátsko protected area during the period of 2003 - 2010. Modelling process consist of assorted consequent steps. First the hydrological model of each catchment was created. Afterwards the sensitivity analysis was conducted to select most sensitive model parameters. Calibration process was carried out after the parameters selection using SWAT-CUP automatic calibration tool. Model results were visualized and evaluated. The results of the model suggested, that the area of interest was not widely endangered by nitrate pollution. Within each catchment the critical source areas of nitrate pollution were identified. It was observed that these areas are related with intensive agricultural areas. Nitrate leaching ranged from 6 kg.ha-1 to 10 kg.ha-1 per year in agriculture areas. Some areas exceed this amount. Nitrate loss from most of the area of interest ranged from 0 kg.ha-1 to 4 kg.ha-1 per year. Concentrations of nitrates in modeled...
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Adsorption of AOM amino acids onto activated carbon
Čermáková, Lenka ; Pivokonský, Martin (advisor) ; Benešová, Libuše (referee)
This diploma thesis deals with the efficiency and factors affecting the adsorption of AOM (Algal Organic Matter) amino acids (AAs) arginine (Arg), phenylalanine (Phe) and aspartic acid (Asp) onto granular activated carbon (GAC) Picabiol 12x40 (PIC). The efficiency of AOM AAs removal was studied in laboratory equilibrium and kinetic experiments and it was shown that the adsorption efficiency of the selected AAs is dependent on the structure of the molecule of AAs and the nature of the functional groups of their side chain, and more particularly to solution pH, which determines the nature and size and surface charge of AAs and GAC. In contrast to this, the ionic strength (IS) of solution had relatively low effect on the AAs adsorption. Arg adsorption efficiency increased with increasing pH and reached a maximum at pH 9, where AAs and GAC were oppositely charged, and this leads to attractive electrostatic interactions. In the case of Asp adsorption on PIC practically did not work. The reason is that under all experimental conditions Asp molecules and the surface of the PIC carried identical negative charge. This led to the strong electrostatic repulsion between Asp and PIC which prevented effective adsorption. In the case of Phe the adsorption decreases with increasing pH. Maximum adsorption...
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Paper, plastics and metals recycling
Kaireshev, Ruslan ; Benešová, Libuše (advisor) ; Doležalová, Markéta (referee)
The latest trends in the field of waste management and recycling show an annual increase in the proportion of municipal waste, especially the municipal solid waste folder, in total waste production in the Czech Republic and in the world. The constant pressure specified by latest amends in the waste and packaging legislation, regulation by the European Union directives on reducing the amount of waste deposited in landfills, pushing the waste management system to increase the rate of recycling of waste, especially of individual commodities such as paper, plastic, metal and cartons. Recycling has its advantages and disadvantages, the current challenge for expert public is to find ways of waste management in the future. Currently, expert public is interested not only with solution of recycling problems itself, but with possibilities of alternative forms of waste recovery. In 2010, thanks to the recycling of paper, plastics, glass and metals saved 23.3 million MJ of energy that may not be produced, which represents one percent of the total energy consumption of the Czech Republic. Recycling reduced the overall green gas emissions by less than one percent, corresponding to 0.96 million tonnes of CO2 equivalent (EKO-KOM). Key words : recycling, paper, plastic, metals
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Seasonal changes of water quality in reservoirs of the Litovecko-Šarecká cascade
Stegarescu, Rodica ; Komínková, Dana (advisor) ; Benešová, Libuše (referee)
This diploma thesis deals with monitoring of water quality in the reservoirs which form the Litovicko- Šárecká cascade. It is a cascade of ponds, waterworks and retention reservoirs situated on the Litovicko-Šárecký stream and is composed of 9 major reservoirs. These reservoirs have different functions: from landscaping, retention, biological as well as recreation: fishing and swimming. Many of these reservoirs flow through human settlements, which have a negative impact on the quality of water within the whole cascade. The goal of this thesis is to monitor physical and chemical indicators of water as well as to determine the composition of phytoplankton populations, assess the state of water depending on the human activities in the basin and also to monitor how has the water quality changed in time and what are the main pollution sources. The water quality was determined from 11 samples collected with monthly intervals during March 2012 to May 2013. Samples were collected on all the reservoirs from the inflow, in the middle and at the outflow for chemical analysis and only from the middle for biological analysis. The following indicators were monitored: temperature, pH, conductivity, dissolved oxygen, indicators of neutralization capacity (ZNK8.3 a KNK4.5), hardness, CODMn, the concentration of...
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Modelling of surface water pollution in the Rakovnický brook water basin using GIS
Komárková, Lenka ; Matějíček, Luboš (advisor) ; Benešová, Libuše (referee)
There is a number of hydrological models with a wide range of applications. With its development, models have recently become an important tool for hydrologists, water managers and environmentalists in the design and operational planning. We have to bear in mind that it is only a simplification of the complexity of the system and it can not include all of the variables. For this reason it is appropriate to model results compared with the measured data. In my diploma thesis I chose SWAT model because it has been positively evaluated by other users and it is compatible with ArcGIS 10.1. The diploma thesis deals with the use of geographic information systems (GIS) and modeling techniques based on SWAT (Soil and Water Assessment Tool) for evaluation of surface flows of nitrates in Rakovnicky brook water basin in hydrological year 2000 with focus on point and non-point sources of pollution. For the spatial data is used ArcGIS 10.1 with the support of basic map layers ZABAGED and DIBAVOD and available aerial photographs and satellite scenes from LANDSAT. This diploma thesis draws on the project GAUK, which took place in the Rakovnicky brook in years 1998 - 2000 and its aim was to evaluate total physical - chemical parameters of the Rakovnicky brook. Model SWAT has proved very difficult and sensitive to the input...
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Possibilities of recycling mobile phones.
Slováková, Jana ; Benešová, Libuše (advisor) ; Polák, Miloš (referee)
Mobile phones are the most used electronic equipment on the globe. Their recycling rate is low because the collection system of end-of-life mobile phones is ineffective. This thesis remains mobile phones collection systems, their composition and content of usable components. The next section describes dealing with mobile phones in the Czech Republic, and the practical part describes the results of research conducted under the ASEKOL, s.r.o. The total weight of the samples was 20 830.27 kg. Total weight in group 3, where mobile phones are, was 13 740.79 kg (5 730 pieces). In comparison with year 2009 the group 3 increased by 155.14 kg, while there was a decline in the number of items in the group - there were from 6,092 pieces to 5,730 pieces.
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ADSORPTION OF ALGAL ORGANIC MATTER PRODUCED BY MICROCYSTIS AERUGINOSA ONTO ACTIVATED CARBON
Krsová, Magdalena ; Pivokonský, Martin (advisor) ; Benešová, Libuše (referee)
The aim of this diploma thesis is to evaluate the efficiency of two types of granular activated carbon (GAC), Filtrasorb TL 830 and Picabiol 12x40, for the adsorption of cellular peptides with low molecular weight produced by cyanobacterium Microcystis aeruginosa that are hardly removable during the coagulation/flocculation processes. The effect of different carbon properties (surface charge, textural characteristics), peptide properties (molecular size, surface functionality and charge) and solution characteristics (ionic strength and pH value) on the peptide uptake was investigated using laboratory equilibrium and kinetic adsorption experiments. The results showed that adsorption of peptides was influenced by the charge conditions in adsorption system that depend on solution pH. The pH value influences surface charge and the point of zero charge (pHpzc) of GAC as well as dissociation and protonization of peptide functional groups. It was found that efficiency of the peptide adsorption increased with decreasing pH value for both GACs. Under these conditions adsorption was enhanced by attractive electrostatic interactions between GAC surface and peptide functional groups and was also positively influenced by the conformation changes in peptide structure. GAC Picabiol 12x40 showed the total highest...
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