The biocidal action of ozone either on aerobic bacterial biofilms of Pseudomonas fluorescens or anaerobic biofilms of two strains of sulphate-reducing bacteria (Desulfovibrio vulgaris and Desulfovibrio desulfuricans) was studied in laboratory experiments within the concentration range of 0.2 to 0.5 ppm under quiescent conditions. Biofilms were formed on SAE 1020 carbon steel and on AISI type 304L stainless steel samples. The influence of the metal surface nature and the contact time on ozone biocidal effectivity as well as ozone effects on the electrochemical behavior of each metal were analyzed. In the case of stainless steel, ozone was effective not only to kill bacteria but also to facilitate the detachment of bacterial biofilms.

Subject
Scanning electron microscopy, Water, Hydrogen concentration, Ozone, Magnification, Micrography, Biofilms, Incubation, Metals, Carbon steel, Stainless steel, Corrosion potential, Samples
Keywords:
ozone, biofilms, sulphate-reducing bacteria, biocide, stainless steel, carbon steel
© 1993 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1993
Association for Materials Protection and Performance (AMPP)
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