Dominika Alexa Teigiserova
Master Thesis - Environmental Engineering - 2017
A sustainable supply of essential nutrients, like omega-3 fatty acids, as well as sustainable supply of energy, is crucial for human survival in the future and this thesis is discussing both of the issues. This research work has two objectives: 1.) to evaluate with laboratory experiment feasibility of promising technology to upgrade biogas by aquatic biomass with subsequent evaluation of omega-3 fatty acid content 2.) to uncover the potential of microalgae to be used in the industrial symbiosis concept.
The experimental part includes three variation in gas treatment. The concept of upgrading biogas to enhance biomass growth of microalgae was confirmed as achievable if proper bioreactor is applied.
Furthermore, this work identified the key services (like cleaning water, carbon dioxide mitigation and upgrading of the biogas) that can be provided by microalgal cultivation with biomass subsequently used for various products (ranging from dietary supplement, animal feed to plastics and biofuels). In order to implement microalgal cultivation to industrial symbiosis on the commercial scale, the key issues have been identified as 1) large-scale closed bioreactors 2) large-scale harvesting 3) more LCAs showing the advantages and superiority of microalgal feedstock 4) further research examples using integration of industrial streams.