1、 ANSI/AWWA B402-12 (Revision of ANSI/AWWA B402-06) AWWA Standard Effective date: March 1, 2012. First edition approved by AWWA Board of Directors June 2, 1968. This edition approved Jan. 22, 2012. Approved by American National Standards Institute Dec. 5, 2011. 6666 West Quincy Avenue Advocacy Denver
2、, CO 80235-3098 Communications T 800.926.7337 Conferences www.awwa.org Education and TrainingScience and TechnologySections The Authoritative Resource on Safe WaterFerrous Sulfate SM Copyright 2012 American Water Works Association. All Rights Reserved. ii AWWA Standard This document is an American W
3、ater Works Association (AWWA) standard. It is not a specification. AWWA standards describe minimum requirements and do not contain all of the engineering and administrative information normally contained in specifi- cations. The AWWA standards usually contain options that must be evaluated by the us
4、er of the standard. Until each optional feature is specified by the user, the product or service is not fully defined. AWWA publication of a standard does not constitute endorsement of any product or product type, nor does AWWA test, certify, or approve any product. The use of AWWA standards is enti
5、rely voluntary. This standard does not supersede or take precedence over or displace any applicable law, regulation, or codes of any governmental authority. AWWA standards are intended to represent a consensus of the water supply industry that the product described will provide satisfactory service.
6、 When AWWA revises or withdraws this standard, an official notice of action will be placed on the first page of the Official Notice section of Journal - American Water Works Association. The action becomes effective on the first day of the month following the month of Journal - American Water Works
7、Association publication of the official notice. American National Standard An American National Standard implies a consensus of those substantially concerned with its scope and provisions. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general pub
8、lic. The existence of an American National Standard does not in any respect preclude anyone, whether that person has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standard. Ameri- can National Standards are
9、subject to periodic review, and users are cautioned to obtain the latest editions. Producers of goods made in conformity with an American National Standard are encouraged to state on their own responsibility in advertising and promotional materials or on tags or labels that the goods are produced in
10、 conformity with particular American National Standards. Caution n oti Ce : The American National Standards Institute (ANSI) approval date on the front cover of this standard indicates completion of the ANSI approval process. This American National Standard may be revised or withdrawn at any time. A
11、NSI procedures require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of publication. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute
12、, 25 West 43rd Street, Fourth Floor, New York, NY 10036; (212) 642-4900, or e-mailing infoansi.org. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information or retrieval
13、 system, except in the form of brief excerpts or quotations for review purposes, without the written permission of the publisher. Copyright 2012 by American Water Works Association Printed in USA Copyright 2012 American Water Works Association. All Rights Reserved. iii Committee Personnel The AWWA S
14、tandards Committee on Iron Salts, Aluminum Salts, and Related Coagulants, which reviewed and approved this standard, had the following personnel at the time of approval: John P. Corless, Chair Jan J. Pavlicek, Vice-Chair General Interest Members M.B. Alvarez, CH2M HILL Inc., Coral Gables, Fla. (AWWA
15、) K.K. Au, Carus Water Technologies, LaSalle, Ill. (AWWA) S.C. Clark,* Standards Council Liaison, HDR Engineering, Denver, Colo. (AWWA) J.D. Edwards, Westerville, Ohio (AWWA) J.J. Gemin, AECOM, Kitchener, Ont., Canada (AWWA) P.H. Hargette, Black Jan. 28, 1990; Jan. 22, 1995; June 11, 2000; and June
16、11, 2006. This seventh edition was approved on Jan. 22, 2012. I.C. Acceptance. In May 1985, the US Environmental Protection Agency (USEPA) entered into a cooperative agreement with a consortium led by NSF International (NSF) to develop voluntary third-party consensus standards and a certification pr
17、ogram for direct and indirect drinking water additives. Other members of the original consortium included the Water Research Foundation (formerly AwwaRF), and the Conference of State Health and Environmental Managers (COSHEM). The American Water Works Association and the Association of State Drinkin
18、g Water Administrators (ASDWA) joined later. In the United States, authority to regulate products for use in, or in contact with, drinking water rests with individual states.* Local agencies may choose to impose requirements more stringent than those required by the state. To evaluate the health eff
19、ects of products and drinking water additives from such products, state and local agencies may use various references, including two standards developed under the direction of NSF, NSF/ANSI 60, Drinking Water Treatment ChemicalsHealth Effects, and NSF/ANSI 61, Drinking Water System ComponentsHealth
20、Effects. Various certification organizations may be involved in certifying products in accor- dance with NSF/ANSI 60. Individual states or local agencies have authority to accept or accredit certification organizations within their jurisdiction. Accreditation of certi- fication organizations may var
21、y from jurisdiction to jurisdiction. * Persons outside the United States should contact the appropriate authority having jurisdiction. NSF International, 789 N. Dixboro Road, Ann Arbor, MI 48105. Copyright 2012 American Water Works Association. All Rights Reserved. ix Annex A, “Toxicology Review and
22、 Evaluation Procedures,” to NSF/ANSI 60 does not stipulate a maximum allowable level (MAL) of a contaminant for substances not regulated by a USEPA final maximum contaminant level (MCL). The MALs of an unspecified list of “unregulated contaminants” are based on toxicity testing guidelines (noncarcin
23、ogens) and risk characterization methodology (carcinogens). Use of Annex A procedures may not always be identical, depending on the certifier. ANSI/AWWA B402 addresses additives requirements in Sec. 4.3 of the standard. The transfer of contaminants from chemicals to processed water or to residual so
24、lids is becoming a problem of greater concern. The language in Sec. 4.3.2 is a recommenda- tion only for direct additives used in the treatment of potable water to be certified by an accredited certification organization in accordance with NSF/ANSI 60 Drinking Water Treatment ChemicalsHealth Effects
25、. However, users of the standard may opt to make this certification a requirement for the product. Users of this standard should consult the appropriate state or local agency having jurisdiction in order to 1. Determine additives requirements, including applicable standards. 2. Determine the status
26、of certifications by parties offering to certify products for contact with, or treatment of, drinking water. 3. Determine current information on product certification. II. Special Issues. II.A. Storage and Handling Precautions. Moist ferrous sulfate heptahydrate has a tendency to compact or cake in
27、storage and has to be contained to prevent any leakage of liquid ferrous sulfate, necessitating increased handling requirements. The particle sizes and particle-size distributions of dried ferrous sulfate heptahydrate are important if the material is to be stored for extended periods and then fed by
28、 mechanical conveying equipment. The smaller the particles, the more readily the compound will compact or cake in storage. Caking is an impediment to feeding with conventional dry-conveying equipment. Heterogeneous particle size is also undesirable for feeding. In general, the cost of ferrous sulfat
29、e increases as particle coarseness and uniformity increase. Particle size is of little importance if the compound is to be dissolved and stored in an aqueous solution. Ferrous sulfate monohydrate will not cake in storage if the material is maintained in a dry storage area. Because of its concentrate
30、d state, monohydrate normally takes longer to dissolve into a solution than does heptahydrate even though both forms of ferrous sulfate are equally soluble. For safety precautions, refer to material safety data sheets (MSDS) available from the supplier or manufacturer. Copyright 2012 American Water Works Association. All Rights Reserved.
