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Bachelor's Thesis
Author of thesis: Pavel Šichnárek
Acad. year: 2025/2026
Supervisor: Ing. David Horňák
Reviewer: Ing. Václav Miklas, Ph.D.
The liquid fraction of digestate from a biogas plant integrated into a municipal wastewater treatment plant system represents a significant technological burden. In the monitored treatment plant, the situation is complicated by the processing of unsorted food waste, which causes massive plastic contamination of the system. The aim of this thesis was to conduct a literature review of available separation methods, select an appropriate technology based on the findings, and subsequently verify it experimentally in removing microplastics and other specific pollutants from a real sample. Based on this review, low-pressure membrane filtration was chosen for laboratory testing. A pilot test in a cross-flow configuration on a ceramic membrane confirmed the technical feasibility of the separation and demonstrated the real dynamics of pore fouling through the formation of a stable cake layer, which resulted in a decrease in permeability. The subsequent main experiment with a two-stage dead-end configuration, utilizing pre-treatment with a nylon membrane and fine filtration through polypropylene membranes, demonstrated high levels of permeability and flux with a minimal increase in hydraulic resistance. Instrumental analysis confirmed the high efficiency of the filtration method (98,6 %) in removing particulate pollution, effectively retaining microplastics and rendering the resulting permeate free of suspended solids. This thesis forms the theoretical and experimental foundation for a broader research project carried out in cooperation with Aqua-reaktor, s.r.o. Future work will focus on the development of a predictive contamination model based on input substrates and the implementation of an optical monitoring system for the continuous, real-time sensing of stream pollution.
Wastewater treatment plant, liquid digestate, membrane filtration, microplastics, anaerobic digestion
Date of defence
08.06.2026
Result of the defence
Defended (thesis was successfully defended)
Grading
A
Process of defence
Student prezentoval bakalářskou práci. Po prezentaci zodpověděl otázky oponenta práce a v navazující diskusi k bakalářské práci následující otázky položené členy komise. Dotaz na upřednostňovanou technologii v provozu. Zodpovězeno uspokojivě. Dotaz na mikroplasy a jejich původ v materiálu (fugátu). Zodpovězeno uspokojivě.
Language of thesis
Czech
Faculty
Fakulta strojního inženýrství
Department
Institute of Process Engineering
Study programme
Fundamentals of Mechanical Engineering (B-ZSI-P)
Specialization
Fundamentals of Mechanical Engineering (STI)
Composition of Committee
prof. Dr. Ing. Marcus Reppich (předseda) doc. Ing. Martin Pavlas, Ph.D. (místopředseda) prof. Ing. Petr Stehlík, CSc., dr. h. c. (člen) prof. Ing. Zdeněk Jegla, Ph.D. (člen) Ing. Pavel Skryja, Ph.D. (člen) Ing. Pavel Lošák, Ph.D. (člen) Ing. Michal Touš, Ph.D. (člen)
Supervisor’s reportIng. David Horňák
Grade proposed by supervisor: A
Reviewer’s reportIng. Václav Miklas, Ph.D.
Grade proposed by reviewer: B
Responsibility: Mgr. et Mgr. Hana Odstrčilová