Data is presented from two field trials where carbon dioxide and ozone were used, in separate efforts, to minimize aqueous discharges from cooling water systems. Carbon dioxide was employed as an alternative to minerals acids, in order to increase the cycles of concentration. The result was that it was possible to decrease bleed-off from the cooling tower without a negative effect on scaling or corrosion rates. In the second field trial, a transition to a virtually zero discharge operation was attempted using ozone, both as a scale and corrosion inhibitor. The data showed that ozone was not effective as a scale inhibitor and furthermore, significant corrosion took place.

Subject
Acids, Water, Corrosion rate, Ozone, Calcium, Acidity, Cooling systems, Cycles of concentration, Steel, Carbon dioxide, Cooling water, Wastes, Scaling
Keywords:
biofilm, carbon dioxide, dezincification, ozone, pH control, zero discharge
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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