Antimicrobial efficacy ofin-situplasma-generated ozone againstPseudomonas aeruginosabiofilms in drains and water-submerged surfaces

Abstract

AbstractAimsTo demonstrate a novel method of gaseous disinfection that can eradicate biofilms inhabiting elusive regions of plumbing systems.Methods & ResultsHighly biocidal ozone is generatedin-situusing the ambient air inside a model sink and drain, via portable plasma discharge, with the plasma device sealing the treated area, ensuring no ozone escape to the external environment. Subsequent bacterial recovery illustrates an approximate bioburden reduction of 5log10for biofilms suspended in the drain, and 6log10for biofilms placed in the sink.ConclusionsPlasma-generated ozone is a safe and effective method for controlling bioburden in periodically wetted, otherwise inaccessible pipework and drains, both above and below the water line.Significance and Impact of StudyThe ozone generation system described has potential for controlling healthcare associated infections (HAIs) and infections linked to closed environments, such as cruise ships, from bacteria arising from waste water systems by aerosolization or splash-back. The method has additional benefits provided by an absence of toxic residues after application, reducing risks to users and the waste water system. Cost effectiveness is high, requiring minimal energy input from the electrical supply and only ambient air (no additional feedstock gas is necessary) to generate ozone.