1、NSF International Standard / American National StandardNSF/ANSI 245 - 2013 Wastewater Treatment Systems - Nitrogen ReductionNSF International, an independent, not-for-profit, non-governmental organization, is dedicated to being the leading global pro-vider of public health and safety-based risk mana
2、gement solutions while serving the in-terests of all stakeholders. This Standard is subject to revision. Contact NSF to confirm this revision is current. Users of this Standard may request clarifications and inter-pretations, or propose revisions by contacting: Chair, Joint Committee on Wastewater T
3、echnology c/o NSF International 789 North Dixboro Road, P. O. Box 130140 Ann Arbor, Michigan 48113-0140 USA Phone: (734) 769-8010 Telex: 753215 NSF INTL FAX: (734) 769-0109 E-mail: infonsf.org Web: http:/www.nsf.orgNSF/ANSI 245-2013 i NSF International Standard/ American National Standard for Wastew
4、ater Technology Nitrogen reduction Standard Developer NSF International NSF International Board of Directors Designated as an ANSI Standard April 21, 2013 American National Standards Instituteii Prepared by The NSF Joint Committee on Wastewater Technology Recommended for Adoption by The NSF Council
5、of Public Health Consultants Adopted by The NSF Board of Directors March 2007 Revised June 2010 Revised November 2010 Revised December 2012 Revised April 2013 Published by NSF International PO Box 130140, Ann Arbor, Michigan 48113-0140, USA For ordering copies or for making inquiries with regard to
6、this Standard, please reference the designation “NSF/ANSI 245-2013.” Copyright 2013 NSF International Previous editions 2012, 2011, 2007 Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, elec-tronic or mechanical, including photocopyin
7、g and microfilm, without permission in writing from NSF International. Printed in the United States of America. iii Disclaimers1NSF, in performing its functions in accordance with its objectives, does not assume or undertake to discharge any responsibility of the manufacturer or any other party. The
8、 opinions and findings of NSF represent its pro-fessional judgment. NSF shall not be responsible to anyone for the use of or reliance upon this Standard by anyone. NSF shall not incur any obligation or liability for damages, including consequential damages, arising out of or in connection with the u
9、se, interpretation of, or reliance upon this Standard. NSF Standards provide basic criteria to promote sanitation and protection of the public health. Provisions for mechanical and electrical safety have not been included in this Standard because governmental agencies or other national standards-set
10、ting organizations provide safety requirement. Participation in NSF Standards development activities by regulatory agency representatives (federal, local, state) shall not constitute their agencys endorsement of NSF or any of its Standards. Preference is given to the use of performance criteria meas
11、urable by examination or testing in NSF Standards development when such performance criteria may reasonably be used in lieu of design, materials, or construc-tion criteria. The illustrations, if provided, are intended to assist in understanding their adjacent standard requirements. However, the illu
12、strations may not include all requirements for a specific product or unit, nor do they show the only method of fabricating such arrangements. Such partial drawings shall not be used to justify improper or incomplete design and construction. Unless otherwise referenced, the annexes are not considered
13、 an integral part of NSF Standards. The annexes are provided as general guidelines to the manufacturer, regulatory agency, user, or certifying organization. 1The information contained in this Disclaimer is not part of this American National Standard (ANS) and has not been processed in accordance wit
14、h ANSIs requirements for an ANS. Therefore, this Disclaimer may contain material that has not been subjected to public review or a consensus process. In addition, it does not contain requirements necessary for conformance to the Standard. iv This page is left intentionally blank. v Contents 1 Genera
15、l . 1 1.1 Purpose 1 1.2 Scope . 1 1.3 Alternate materials, design, and construction 1 1.4 Performance classification . 1 2 Normative references . 2 3 Definitions . 2 4 Materials . 3 4.1 Interior surfaces . 3 4.2 Exterior surfaces 3 4.3 Welding 3 4.4 Dissimilar metals 4 5 Design and construction . 4
16、5.1 Exposed surfaces . 4 5.2 Structural integrity 4 5.3 Infiltration and exfiltration resistance 4 5.4 Noise 4 5.5 Mechanical components 4 5.6 Electrical components 4 5.7 Access ports . 5 5.8 Failure sensing and signaling equipment . 5 5.9 Flow design 6 5.10 Data plate and service label 6 6 Product
17、literature 6 6.1 Owners manual . 6 6.2 Additional product literature 7 7 Other documentation 9 8 Performance testing and evaluation . 9 8.1 Preparations for testing and evaluation 9 8.2 Testing conditions, hydraulic loading and schedules . 10 8.3 Sample collection . 11 8.4 Criteria 12 8.5 Final repo
18、rt . 13 Annex A . A1 Annex B . B1 vi This page is intentionally left blank. vii Foreword2The purpose of this Standard is to establish minimum materials, design and construction, and performance requirements for residential wastewater treatment systems providing for nitrogen reduction. This Standard
19、also specifies the minimum literature that manufacturers shall supply to authorized representatives and owners, as well as the minimum service-related obligations that manufacturers shall extend to owners. The Joint Committee on Wastewater Technology granted NSF International the authority to procee
20、d with the evaluation and development of a stand-alone Nutrient Reduction Standard. A task group of Joint Committee members was formed to do the evaluation and bring recommendations to the Joint Committee. After evaluating the scope of the Standard, the task group decided to narrow the focus to nitr
21、ogen reduction and revisit the issue of reduction of other nutrients at a later time. This Standard (NSF/ANSI 245-2013) includes the following change: Issue 7 The purpose of this ballot was to update the language in section 8.4.1 for consistency among wastewater standards relating to pH grab samples
22、. The change in section 9 addressed a comment on the ballot 40i20 regarding when adjustments to alkalinity are made, they are required to be reported. Annex B Nitrogen reduction measurement (informational) - The purpose of this annex is to help Regulators and Users of this Standard understand the pe
23、rcent reduction for nitrogen reduction in comparison to a set nitrogen effluent limit. This Standard was developed by the NSF Joint Committee on Wastewater Technology using the consensus process described by the American National Standards Institute. Suggestions for improvements of this Standard are
24、 welcome. This standard is maintained on a Continuous Maintenance schedule and can be opened for comment at any time. Comments should be sent to Chair, Joint Committee on Wastewater Technology at standardsnsf.org, or c/o NSF International, Standards Department, P.O. Box 130140, Ann Arbor, Michigan 4
25、8113-0140, USA. 2The information contained in this Foreword is not part of this American National Standard (ANS) and has not been pro-cessed in accordance with ANSIs requirements for an ANS. Therefore, this Foreword may contain material that has not been subjected to public review or a consensus pro
26、cess. In addition, it does not contain requirements necessary for con-formance to the Standard. 1 2013 NSF NSF/ANSI 245-2013 NSF/ANSI Standard for Wastewater Treatment Systems Nitrogen Reduction 1 General 1.1 Purpose The purpose of this Standard is to establish minimum materials, design and construc
27、tion, and performance requirements for residential wastewater treatment systems providing for nitrogen reduction. This Standard also specifies the minimum literature that manufacturers shall supply to authorized representatives and owners, as well as the minimum service-related obligations that manu
28、facturers shall extend to owners. 1.2 Scope This Standard contains minimum requirements for residential wastewater treatment systems having rated treatment capacities of 1514 L/d (400 gal/d) to 5678 L/d (1500 gal/d) that are designed to provide reduction of nitrogen in residential wastewater. Manage
29、ment methods for the treated effluent discharged from these systems are not addressed by this Standard. A system, in the same configuration, must either be demonstrated to have met the Class I requirements of NSF/ANSI 40 or must meet the Class I requirements of NSF/ANSI 40 during concurrent testing
30、for nutrient removal. The water chemistry of a site for installation and use of these systems is critical to achieve expected water quality results. Before these systems are installed at a location, the water used within the residence must be analyzed to verify that there is sufficient alkalinity to
31、 achieve the systems performance. Refer to Annex A for further explanation. Natural systems involving features such as vegetation, wetlands, free access or buried sand filters, and soil systems may be evaluated using this protocol as long as effluent samples are representative of all treated effluen
32、t discharged from the system, as sampled from a central point of collection of all treated effluent. 1.3 Alternate materials, design, and construction While specific materials, designs, and constructions may be stipulated in this Standard, systems that incorporate alternate materials, designs, or co
33、nstructions may be acceptable when it is verified that such systems meet the applicable requirements herein. 1.4 Performance classification For the purpose of this Standard, systems are classified according to the chemical, biological, and physical characteristics of their effluents as determined by
34、 the performance testing and evaluations described herein. All systems within a manufacturers model series may be classified according to the performance testing and evaluation of the system with the smallest hydraulic capacity within the series. Performance testing and evaluation of larger systems
35、within the series (having hydraulic treatment capacities within the scope of this Standard) may not be necessary provided that the dimensions, hydraulics, mixing, filtering and biological treatment capabilities, and other applicable design characteristics are proportionately equivalent to the evalua
36、ted system. 2013 NSF NSF/ANSI 245-2013 2 2 Normative references The following documents contain provisions that, through reference in this text, constitute provisions of this Standard. At the time of publication, the indicated editions were valid. All standards are subject to revision, and parties a
37、re encouraged to investigate the possibility of applying the recent editions of the standards indicated below. American Public Health Association (APHA), American Water Works Association (AWWA) periodic cleaning or replacement of components and removal of residuals as required by the manufacturer in
38、 the operations and maintenance manual; NOTE “Periodic” refers to all procedures specified in the manufacturers operation and maintenance manual that must be performed within intervals of two years. visual inspection and sampling as required by the manufacturer in the operations and maintenance manu
39、al, including a means for collecting a representative effluent sample, determining the need for residuals removal and determining the need for replenishing treatment chemicals (if required); and removal (manually or by pumping) of collected residuals as required by the manufacturer in the operations
40、 and maintenance manual. If the operation and maintenance manual describes a means to determine the need to remove residuals from a chamber without ground-level access, then only the ability to install ground-level access shall be required. Systems without ground-level access to a chamber shall be e
41、quipped with a means to locate the opening to the chambers. This information shall be provided on or in a ground-level access opening. 5.7.2 Access ports shall be protected against inadvertent unauthorized intrusions. Acceptable protective measures include, but are not limited to, a: padlock; cover
42、that can be removed only with specialized tools; or cover having a minimum net weight of 29.5 kg (65 lb). 5.8 Failure sensing and signaling equipment The system shall possess a mechanism or process capable of detecting failures of electrical and mechanical components, or the need for replenishment o
43、f treatment chemicals, critical to the treatment processes, and of delivering a visible and audible signal to notify the owner or user of the failure. The system shall possess a mechanism or process capable of detecting a high water condition and delivering a visible and audible signal to notify the
44、 owner or user that the water level is above normal operating specifications. The visual and auditory signals shall continue to be functional in the event of an electrical, mechanical, or hydraulic malfunction of the system providing power is available to the system and shall resume once power is re
45、started following the power outage. This does not mandate a battery back-up for the alarm system. Compliance with the requirements of section 5.8.1 and 5.8.2 shall be determined by a group of three observers. Observers shall be employees of the test agency. 5.8.1 Visual Alarm Test The audible portio
46、n of the alarm shall be disabled during the visual alarm test. The visual portion of the signal shall be conspicuous from a distance of 15 m (50 ft). There shall be a minimum of 5 random on/off trials of the visual alarm. The observers shall turn their backs to the alarm panels such that they cannot
47、 see the visual portion of the alarm prior to each trial during the visual alarm test. The visual alarm shall be on for a minimum 2013 NSF NSF/ANSI 245-2013 6 of one trial and off for a minimum of one trial during the test but the on/off condition shall otherwise be selected randomly. Observers shal
48、l face the alarm panel when requested during the test. Compliance with these requirements is demonstrated only when all observers provide the correct answer for each trial. 5.8.2 Audible Alarm Test The visual alarm shall be disabled during the audible alarm test. Observers shall have their backs to
49、the alarm during the audible testing. The audible portion of the signal shall be discernible from a distance of 15 m (50 ft) with a minimum ambient noise level of 60 dbA. When the ambient noise level is less than 60 dbA, it shall be augmented with a steady tone between 100 and 1000 hertz. The ambient noise level shall be measured at the location where the observers will be located. The audible alarm shall be activated a minimum of 3 times. The observers shall record the number of times the audible alarm was heard. Compliance with these requirements
