A method of treatment by reverse osmosis (RO) has been developed and implemented for the treatment of waste waters from organic acid cleaning applied to the chemical cleaning of power plant once-through boilers. Concentrate waste waters containing COD and nitrogen components, such as ammonia and dilute waste waters from water washing, are separately stored. The concentrate waste water is treated by RO into a dilute permeate and a thickened waste water. By repetition of this process, the waste water volume is reduced to 1/4-1/6 of the original. In the permeate, COD and ammonia concentrations are as low as below 1/100 of those before treatment. The resulting dilute permeate and the dilute waste water from water washing are mixed together and subjected to chemical oxidation and decomposition treatment to further reduce COD to below 10 mg/l. The results of treatment are also shown.

Subject
Water cleaning, Concentrates, Chemical cleaning, Ammonia, Organic acids, Solutions, Pressure, Water quality, Boilers, Chemical treatment, Cleaning, Oxidation, Waste water
Keywords:
Reverse osmosis (RO), boiler chemical cleaning, waste water, organic acid cleaning
© 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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