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

0542760 - BÚ 2022 RIV CH eng J - Journal Article
Čech, J. - Sťahel, P. - Ráhel’, J. - Prokeš, L. - Rudolf, P. - Maršálková, Eliška - Maršálek, Blahoslav
Mass Production of Plasma Activated Water: Case Studies of Its Biocidal Effect on Algae and Cyanobacteria.
Water. Roč. 12, č. 11 (2020), č. článku 3167. E-ISSN 2073-4441
R&D Projects: GA ČR GA19-10660S; GA TA ČR SS01020006
Institutional support: RVO:67985939
Keywords : plasma activated water * electrical discharges with liquids * cyanobacteria * decontamination
OECD category: Mechanical engineering
Impact factor: 3.103, year: 2020
Method of publishing: Open access
https://doi.org/10.3390/w12113167

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.
Permanent Link: http://hdl.handle.net/11104/0320108