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Hygienization of dewatered sewage sludge using vermicomposting process under field conditions
Fojtová, Zuzana ; Innemanová, Petra (advisor) ; Grasserová, Alena (referee)
Sewage sludge is a waste material that is a valuable source of organic matter and nutrients and is used as a fertiliser on agricultural land in many countries around the world. However, the application of sewage sludge carries risks associated with the presence of pathogenic micro- organisms and other undesirable substances in this material and in many countries sewage sludge must meet limits for land application. Vermicomposting of these materials can be one effective way of reducing pathogens in sewage sludge. In this thesis, I investigated the effectiveness of sanitizing sewage sludge in the vermicomposting process under field conditions. The experiment was conducted in an earthen vermicomposter with a total working volume of 10.5 m3 near the village of Hrbov, near Lhenice in the South Bohemia region. Hygienization efficiency was measured using a test with an introduced microorganism (E. coli). The test was modified for the vermicomposting process. In the experiment, a mixture of sewage sludge mixed with birch chips in a ratio of 1:1.5 (sludge: chips) was (i) vermicomposted for six months, (ii) composted only, and (iii) composted for one month and then vermicomposted. In addition to the evaluation of the hygienisation efficiency of the different options, the stability and possible phytotoxicity...
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The effect of irrigation with treated wastewater on the development of soil hydrophobicity
Fojtová, Zuzana ; Innemanová, Petra (advisor) ; Šereš, Michal (referee)
In this work I have dealt with the influence of irrigation with treated wastewater on the development of soil hydrophobicity. In the theoretical part I deal with the influence of using treated wastewater on the development of hydrophobicity in soils irrigated in such manner, the methods used for measurement and in general the benefits and risks of application of treated wastewater to soil. In the practical part, I focused on measuring hydrophobicity using the Water Drop Penetration Time (WDPT) method. Soil samples originated from the Hostětín, where a long-term irrigation test with treated wastewater is underway. For the purpose of testing the WDPT method, soil samples taken at the beginning of the experiment (in 2018) were used, as well as long-term irrigated samples with treated wastewater from the constructed wetland under laboratory conditions. As a control served irrigation with well water and part of the samples from both variants was additionally irrigated with rainwater, which simulated the amount of precipitation that fell on average in the Zlín Region during the experiment. The water used for this experiment came from a constructed wetland close to the Perlová voda complex near Kostelec nad Ohří in the Ústí Region. The samples were irrigated for one year. The method was further tested on...
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