Mass Production of Plasma Activated Water: Case Studies of Its Biocidal Effect on Algae and Cyanobacteria

Efficient treatment of contaminated water in industrially viable volumes is still a challenging task. The hydrodynamic cavitation plasma jet (HCPJ) is a promising plasma source for industrial-scale generation of biologically active environments at high flow rates of several m(3)/h. The combined effect of a hydro-mechanical phenomenon consisting of hydrodynamic cavitation and electrical discharge in cavitation voids was found to be highly efficient for large-volume generation of reactive oxygen species, ultraviolet (UV) radiation, and electro-mechanical stress in a liquid environment. Here, the persistence of biocidal properties of HCPJ-activated water (i.e., plasma-activated water (PAW)) was tested by the study of algae and cyanobacteria inactivation. Algae and cyanobacteria cultivated in media containing PAW (1:1) were completely inactivated after 72 h from first exposure. The test was performed at a total power input of up to 0.5 kWh/m(3) at the treated liquid flow rate of 1 m(3)/h. A beneficial modification of our previous HCPJ design is described and thoroughly characterized with respect to the changes of hydrodynamic flow conditions as well as discharge performance and its optical characteristics. The modification proved to provide high biocidal activity of the resulting PAW, which confirms a strong potential for further design optimization of this promising water (liquid) plasma source

Transition of cavitating flow to supercavitation within Venturi nozzle – hysteresis investigation

Cavitation is usually considered as undesirable phenomena. On the other hand, it can be utilized in many applications. One of the technical applications is using cavitation in water treatment, where hydrodynamic cavitation seems to be effective way how to reduce cyanobacteria within large bulks of water. The main scope of this paper is investigation of the cavitation within Venturi nozzle during the transition from fully developed cavitation to supercavitation regime and vice versa. Dynamics of cavitation was investigated using experimental data of pressure pulsations and analysis of high speed videos, where FFT of the pixel intensity and Proper Orthogonal Decomposition (POD) of the records were done to identify dominant frequencies connected with the presence of cavitation. The methodology of the high speed (HS) records semiautomated analysis using the FFT was described. Obtained results were correlated and above that the possible presence of hysteresis was discussed

Optimalization of the protocol for dendritic cell derivation from bone marrow and comparison with spleen dendritic cells

Dendritic cells are the main antigen presenting cells of the immune system. Their primary function is to process and to present antigen, and they are the only cells that are able to trigger a primary response in naive T lymphocytes. The aim of this study wa to find out what conditions of derivation from bone marrow are most suitable for obtaining the purest population of dendritic cells. Further the purity, phenotype, levels of activation, and the amount of cytokines produced were compared in splenic cells and cells derived from bone marrow cells

Dishwashers as an important source of phosphorus of wastewaters

In presence one of the main and most important source of phosphorus in wastewaters are washing substances from dishwashers. They content more than 15 % of phosphates. We make analyses of 17 substances from our market. It was found, thet more than 1/3 content about 30% phosphates. Dishwashers are very important sours of phosphorus for surface watrs

Technolofies for cyanotoxin removal in drinking water

Overview of methods and technologies for cyanotoxin removal in drinking water

Projekt revitalizace ovocného sadu v k.ú. Hajany

The first part of the thesis summarizes the theoretical background elaborated from the literature dealing with the issue of functional plantations in the landscape and extensive management in connection with fruit trees. In addition, field surveys were carried out at the selected locality, which consisted of locality surveys and focused on the current state of existing woody vegetation. By processing the information obtained in the theoretical part and in the field work, variants of the restoration of the old kit at the selected location were proposed. The optimal variant then became the main subject of the second part of the thesis, in which it was further elaborated into modified project documentation for zoning proceedings

Morphology, ecology and invasion of toxic cyanobacterium Cylindrospermopsis raciborskii

Description of morphology, ecology and the current occurence of potentially invasive toxic cyanobacterial species Cylindrospermopsis raciborskii. We summarized all findings in the Czech Republic

Návrh managementu a zpřístupnění VKP Maděrany v k.ú. Hajany, bývalý okres Brno - venkov

The purpose of the bachelor thesis was to propose a management plan for the important landscape element Maderany and its accessibility. The management proposal was based on an investigation of the current state of the area and on other restrictions, imposed by the forestry management plan and urban planning documentation of the municipality. The attachment contains graphical representations of placement suggestions for each intervention. A literary research on the term important landscape element was conducted as part of the overview of the subject

Possibilities of removal of selected estrogens from water using

Advanced wastewater treatment technologies are focused on removal of micropolutants such as pharmaceuticals, estrogen disrupting compounds etc. To protect public health it is not possible to stop using pharmaceuticals, but it is necessary to find environmental friendly technologies which can remove or reducce these compounds. So called green technology and ferrates belongs to this treatment. It was found that estrogenes are reduced/removed from wastewater with different efficiency by common processes as it is shown in this paper. Processes using vegetative treatment and activated sludge treatment are compared. Results of estrogen removal by zerovalent iron and hexavalent iron are introduced

Nanotechnology and alternative technology for phosphorus reduction

Summarisation of information about methods reducing phosphorus in waste water