A comparison of the action of various biocides on corrosive biofilms
- Univ. of La Plata (Argentina). Dept. of Chemistry
- UFRGS, Porto Alegre, Rio Grande do Sul (Brazil)
Results of several years laboratory experience with biocides in the presence of bacterial biofilms on metal surfaces are reported. Planktonic growth and biofilms of Pseudomonas sp. and Pseudomonas fluorescens, were used to assess the biocidal efficacy of glutaraldehyde, formaldehyde, ammonium didecyldimethyl chloride, an isothiazolinones mixture, ozone and sodium hypochlorite. All the biocides showed to be effective to kill planktonic cells within the concentration ranges assayed in this paper. This effectivity was restricted for sessile bacterial population, when the biocidal efficacy was assessed on bacterial biofilms under the same experimental conditions and for the same contact times. An interpretation of the decrease of the biocidal efficacy on sessile bacteria is envisaged under the light of new conceptions on biofilm structure. The electrochemical behavior of two different steels (carbon steel and AISI type 304 stainless steel) was also tested in the presence of each of the biocides used in this work by means of open circuit potential vs. time evaluation, potentiodynamic polarization assays and Tafel polarization. The passive behavior of both steels was not significantly altered in any of the biocide solutions assayed. However, the passive or active behavior of the metallic substratum can influence either the biocide penetration into the biofilm or the bacterial detachment after exposure to the biocide solution.
- OSTI ID:
- 397842
- Report Number(s):
- CONF-960389-; TRN: IM9649%%50
- Resource Relation:
- Conference: National Association of Corrosion Engineers (NACE) annual corrosion conference and exposition: water and waste water industries, Denver, CO (United States), 24-29 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of Corrosion/96 conference papers; PB: [6615] p.
- Country of Publication:
- United States
- Language:
- English
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