This thesis is focused on the combination of basic and applied research of processes induced by plasma in liquids, and their eﬀects on bacteria and fungi.
Electro-spraying of natural de-contaminant (essential oil) through the transient spark discharge was used to examine bactericidal properties of essential oils activated with plasma. Essential oils in general as well as oregano essential oil in particular are known for their antiseptic properties, i.e. bactericidal, fungicidal, analgetic, sedative, etc., and are usually used in vaporized phase. However, vaporization is highly time consuming process and takes up to 72 hours, depending on experimental conditions.
The transient spark discharge was used to decrease the time needed to provide bacteria and fungi inactivation (in this experiment from 12 hours to 4 minutes) and at the same time to induce processes, which can lead to gain more eﬃcient bactericidal eﬀect of OEO.
Traditional modes of carbon capture such as pre-combustion and post-combustion CO2 capture from large point sources can help slow the rate of increase of the atmospheric CO2 concentration, but only the direct removal of CO2 from the air, or “direct air capture” (DAC), can actually reduce the global atmospheric CO2 concentration. The past decade has seen a steep rise in the use of chemical sorbents that are cycled through sorption and desorption cycles for CO2 removal from ultra-dilute gases such as air.
This present review is aimed to gain understanding how microalgae assimilate different forms of carbons and provide a comprehensive overview of the current advances in utilizing microalgae for CO2 fixation, with focus on strain screening and improvement, mass cultivation practice, and effects of environmental and nutritional factors on CO2 fixation performance. Economic viability, challenges and perspectives of microalgae-mediated CO2 biomitigation are also discussed.
NASA is currently planning human spaceflight missions with longer durations than ever before. Closed-loop technologies, specifically photosynthetic algal photobioreactors, can offer multiple functions such as air revitalization (CO2 absorption and O2 provision) and thermal control with less launch mass and volume for long-duration flights.
The use of microalgae for the purpose of CO2 sequestration is a unique environmental technology. Microalgae are promising candidates for CO2 mitigation, which aids in combating GHG-related environmental impacts and has the added benefit of producing renewable biomass.