čas: 7.6.2020 12:22:07
Obnovit | RAW
Department of Water Technology and Environmental Engineering
List of available PhD theses
Artificial sweeteners removal in wastewater treatment processes
Complex upgrading of biogas including membrane separation and bioconversion of separated carbon dioxide with external hydrogen
The topic of this work is to increase energy utilization of biogas from organic waste processed by anaerobic fermentation technology. The conversion of biogas into biomethane, that is more energy-efficient, is based on the removal of CO2 by means of membrane separation. The biological conversion of separated waste CO2 into biomethane using external hydrogen also increases the overall energy yield from the waste. The conversion takes place in a bioreactor constructed as a trickle packed column with biofilm of hydrogenotrophic methanogens. The bioreactor is included in the full-scale technological line of biogas treatment and it is necessary to verify and optimize the technological parameters of the bioreactor and process efficiency. The main monitored parameters of operation are pressure, temperature, gas inflow into the system and volumetric loading of the bioreactor by gases. Also important is the economic and social evaluation of the benefits of biogas treatment to biomethane and bioconversion of CO2 to biomethane at the application site.
Occurrence of microplastics in sewage sludge, effect of thermal hydrolysis
Phosphorus recovery from wastewater
Pretreatment of sludge by thermal hydrolysis – impact on dewaterability and structure of digested sludge
Thermal hydrolysis is established method of sludge pretreatment improving biodegradability of sludge and biogas yield during anaerobic sludge digestion. The sludge structure change after hydrolysis and its impact on sludge dewaterability is very important from practical point of view. The sludge structure and dewaterability will be studied at different types and conditions of thermal processes. Finally, the optimal method of thermal hydrolysis will be proposed in relation to different aspects of digested sludge quality.
Removal of Organic Compounds from Water Using Membrane Processes
The aim of the work will be testing of organic and inorganic membranes for the removal of organic pollutants from water. The membranes of different porosity and their suitability for the removal of various types of pollution will be tested. Removability of the contamination will be evaluated for the different types of membranes depending on the size of the macromolecules. The membrane fouling and the possibility of their regeneration in various ways, including regeneration by chemical agents, will be tested. The results should be particularly applicable in the drinking water area.
Removal of emerging pollutants to allow wastewater reuse
Emerging pollutants such as farmaceuticals, personal care products or hormones became an important factor jeopardizing the reuse of treated wastewater originating from various sources, i.e. effluents from urban wastewater treatment plants, treated grey water etc. As water recovery technologies are often based on membrane bioreactors (MBR), it would be beneficial to upgrade these MBRs to remove persistent organic pollutants besides other pollution. In this project, we aim to develop technology for micropollutants removal in small scale, so that it mey be applied e.g. for decentralized recycling of grey water.
System for remote monitoring of grey water reuse
One of the main obstacles to the use of treated gray water (i.e. water from bathrooms or washing machines) is the missing method for automatic detection of contamination in the treated waste water. As a result, it is not possible to use recycled water where there is a higher risk of end users exposure to the water contaminated with pathogens (e.g. washing machines, cleaning floors etc.).
In this project, we will develop an early warning system that will automatically detect disturbances in gray water treatment technology and especially the penetration of pathogenic organisms into the recovered water.
Technologies for removal of antibiotic resistant bacteria and antibiotic resistance genes from sewage sludge
In this Ph.D. project, we will quantify the amount of antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) that enter the environment through the application of sewage sludge in agriculture. Further, we will test the effectiveness of technologies for sanitation of sewage sludge (thermophilic anaerobic stabilization, thermal hydrolysis, pasteurization, liming etc.) in terms of their ability to remove antibiotic resistance. For all technologies, process conditions will be sought to ensure the removal of ARB and ARGs that occur in free DNA. As test sludges, sludges from thermophilic and mesophilic anaerobic stabilization, sludges after aerobic stabilization, sludges from fat separators, and wastes exported to wastewater treatment plants will be selected. The aim of the project is to propose parameters of sludge disinfection processes that safely ensure the removal of ARB and ARG so that sludge can be used as fertilizer. The work will be done under the co-supervision of prof. Lise Apples of KU Leuven and the doctorate should result in a double degree from UCT Prague and KU Leuven.
Technologies for the removal of antibiotic resistant bacteria from sewage sludge
The use of anammox bacteria as the source of specific membrane phospholipids
This research focuses on the study of membrane phospholipids (mainly ladderans), which can be found in membranes of anammox bacteria. These phospholipids, which do not occur in any other bacteria, have a very unusual chemical structure and form extremely resistant membranes. The aim of this research is a detailed description of the properties and functions of membranes made of ladderans and the search for extraction methods and subsequent use of ladders.