ISO INTERNATIONAL STANDARD 9887 First edition 1992-10-01 Water quality -- Evaluation of the aerobic biodegradability of organic compounds in an Semi-continuous activated aqueous medium --- sludge method (SCAS) Qualite de I'eau - Evaluation, en milieu aqueux, de la biodegradabilite aerobie des composes organiques -- Methode semi-continue par boues activées (Methode SCAs) Reference numbel ISO 9887:1992(E) Copyright International Organization for Standardization Not for Resale IS0 9887:1992(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through Iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations. govern- mental and non-governmental, in liaison with isO, also take part in the work. iso collaborates closely with the International Electrotechnical Commission (lEC)on all matters of electrotechnical standardization Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IsO 9887 was prepared by Technical Committee ISO/TC 147. Water quality, Sub-Committee SC 5, Biological methods. 1SO1992 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56CH-1211 Geneve 20· Switzerland Printed in Switzerland ii license from IHS Not for Resale ISO 9887:1992(E) INTERNATIONAL STANDARD Water quality -- Evaluation of the aerobic biodegradability of organic compounds in an aqueous medium Semi-continuous activated sludge method (ScAS) WARNING --- SAFETY PRECAUTIONS -- Activated sludge and sewage may contain potentially pathogenic organisms. Therefore appropriate precautions should be taken when handling them. Toxic test compounds and those whose properties are unknown should be handled with care. Normative references Scope 1 This International Standard specifies a method for the evaluation of the biodegradability ("ultimate" or The following standards contain provisions which, "primary") of organic compounds. The conditions through reference in this text, constitute provisions described in this International Standard are much of this International Standard. At the time of publi- more favorable for biodegradation than those spec- cation, the editions indicated were valid. All stan- ified in the methods for biodegradability described dards are subject to revision, and parties to inISO7827.ISO9408and1SO9439 agreements based on this international Standard are encouraged to investigate the possibility of ap- The method applies to organic compounds which plying the most recent editions of the standards in- are dicated below. Members of IEC and IsO maintain registers of currently valid International Standards. a) soluble at the concentration used under the test conditions; IsO 7827:1984. Water quality Evaluation in an aqueous medium the "ultimate" of aerobic b) non-volatile, or which have a negligible vapour biodegradability of organic compounds - Method by pressure under the test conditions: analysis of dissolved organic carbon (DOc) c) not lost by foaming from the test solution: ISO 8192:1986, Water quality --. Test for inhibition of oxygen consumption by activated sludge. d) not significantly adsorbable on glass and acti- vated sludge: IsO 8245:1987, Water quality -- Guidelines for the determination of total organic carbon (TOC). e) not inhibitory to the test micro-organisms at the concentration chosen for the test. Inhibitory ef-