ABSTRACT
The bacteria selected for the biological validation test was a nonpathogenic strain of E. coli, which was considered the most reliable measure of public risks in drinking water since its presence was an indicator of fecal pollution and the possible presence of enteric pathogens. Bacterial growth and measurement techniques included the production of agar plates, incubating and growing bacteria, and performing bacterial colony counts on the plates. A bacteria-laden solution was introduced into the vessel near the top of the anode cylinder and moved tangentially along the wall, creating a complete circle prior to entering the plasma region. Plasma sterilization is a complicated process determined by multiple plasma species and factors, including thermal effect, charged particles, excited species, reactive neutrals, and ultraviolet radiation. Thermal plasma has been traditionally used for the application in the form of the so-called cauterization devices: argon plasma coagulators, and argon beam coagulators.
