1、NSF International Standard / American National StandardNSF/ANSI 245 - 2018 Residential Wastewater Treatment Systems - Nitrogen ReductionNSF International, an independent, not-for-profit, non-governmental organization, is dedicated to being the leading global provider of public health and safety-base
2、d risk management solutions while serving the interests 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 interpretations, or propose revisions by contacting: Chair, Joint Committee on Was
3、tewater Technology 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.org i NSF/ANSI 245 2018 NSF International Standard/ American National Standard
4、for Wastewater Technology Residential Wastewater Treatment Systems Nitrogen Reduction Standard Developer NSF International Designated as an ANSI Standard January 24, 2018 American National Standards Institute ii Prepared by The NSF Joint Committee on Wastewater Technology Recommended for Adoption by
5、 The NSF Council of Public Health Consultants Adopted by The NSF International March 2007 Revised June 2010 Revised November 2010 Revised December 2012 Revised April 2013 Revised April 2018 Published by NSF International PO Box 130140, Ann Arbor, Michigan 48113-0140, USA For ordering copies or for m
6、aking inquiries with regard to this Standard, please reference the designation “NSF/ANSI 245-2018.” Copyright 2018 NSF International Previous editions 2013, 2012, 2011, 2007 Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
7、or mechanical, including photocopying 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
8、manufacturer or any other party. The opinions and findings of NSF represent its professional 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
9、 out of or in connection with the use, 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 agenc
10、ies or other national standards-setting 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 t
11、he use of performance criteria measurable by examination or testing in NSF Standards development when such performance criteria may reasonably be used in lieu of design, materials, or construction criteria. The illustrations, if provided, are intended to assist in understanding their adjacent standa
12、rd requirements. However, the illustrations 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 referenc
13、ed, the Annexes are not considered 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 no
14、t been processed in accordance with 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. This page is intentionally
15、left blank.v Contents 1 General . 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
16、. 4 5 Design and construction . 4 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.
17、10 Data plate and service label 6 5.11 Alternate air delivery components . 7 6 Product literature 7 6.1 Owners manual 7 6.2 Additional product literature 8 7 Other documentation 9 8 Performance testing and evaluation . 9 8.1 Preparations for testing and evaluation 9 8.2 Testing conditions, hydraulic
18、 loading and schedules 11 8.3 Sample collection 12 8.4 Criteria. 13 8.5 Final report 14 Annex A Information about nitrogen process 15 Annex B Information about nitrogen reduction measurement . 19 This page is intentionally left blank.vii Foreword2The purpose of this Standard is to establish minimum
19、materials, design and construction, 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
20、-related obligations that manufacturers shall extend to owners. The Joint Committee on Wastewater Technology granted NSF International the authority to proceed with the evaluation and development of a stand-alone Nutrient Reduction Standard. A task group of Joint Committee members was formed to do t
21、he evaluation and bring recommendations to the Joint Committee. After evaluating the scope of the Standard, the task group decided to narrow the focus to nitrogen reduction and revisit the issue of reduction of other nutrients at a later time. This edition of the Standard contains the following revi
22、sions: Issue 12 Language addressing noise requirements for indoor systems was added. Issue 13 Sections 5 and 8 were harmonized with recently approved language in NSF/ANSI 40 regarding blowers. Issue 14 The term Residential was added to the title. This Standard was developed by the NSF Joint Committe
23、e on Wastewater Technology using the consensus process described by the American National Standards Institute. Suggestions for improvements of this Standard are welcome. This standard is maintained on a Continuous Maintenance schedule and can be opened for comment at any time. Comments should be sen
24、t to Chair, Joint Committee on Wastewater Technology at standardsnsf.org, or c/o NSF International, Standards Department, P.O. Box 130140, Ann Arbor, Michigan 48113-0140, USA. 2The information contained in this Foreword is not part of this American National Standard (ANS) and has not been processed
25、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 process. In addition, it does not contain requirements necessary for conformance to the Standard. This page is intentionally left blank.1 2018 N
26、SF NSF/ANSI 245 2018 NSF/ANSI Standard for Residential Wastewater Treatment Systems Nitrogen Reduction 1 General 1.1 Purpose The purpose of this Standard is to establish minimum materials, design and construction, and performance requirements for residential wastewater treatment systems providing fo
27、r 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 manufacturers shall extend to owners. 1.2 Scope This Standard contains minimum requirements for
28、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. Management methods for the treated effluent discharged from these systems are not addressed by thi
29、s 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 for nutrient removal. The water chemistry of a site for installation and use of these system
30、s 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 achieve the systems performance. Refer to Annex A for further explanation. Natural systems
31、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 effluent discharged from the system, as sampled from a central point of collection of all treated e
32、ffluent. 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 constructions may be acceptable when it is verified that such systems meet the applicable requ
33、irements 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 the performance testing and evaluations described herein. All systems within a manufacturer
34、s 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 within the series (having hydraulic treatment capacities within the scope of this Standard)
35、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 evaluated system. 2018 NSF NSF/ANSI 245 2018 2 2 Normative references The following documents cont
36、ain 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 are encouraged to investigate the possibility of applying the recent editions of the standard
37、s 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 the operations and maintenance manual; NOTE “Periodic” refers to all procedures specified i
38、n 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 manual, including a means for collecting a representative effluent sample, determining the need
39、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 and maintenance manual. If the operation and maintenance manual describes a means to determ
40、ine 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 equipped with a means to locate the opening to the chambers. This information shall be provid
41、ed 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 that can be removed only with specialized tools; or cover having a minimum net weight of 29.
42、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 of treatment chemicals, critical to the treatment processes, and of delivering a visible and
43、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 owner or user that the water level is above normal operating specifications. The visual and
44、 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 restarted following the power outage. This does not mandate a battery back-up for the alarm sy
45、stem. 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. 2018 NSF NSF/ANSI 245 2018 6 5.8.1 Visual alarm test The audible portion of the alarm shall be disabled during the visual alarm test.
46、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 see the visual portion of the alarm prior to each trial during
47、 the visual alarm test. The visual alarm shall be on for a minimum 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 shall face the alarm panel when requested during the test. Compliance with these requirements is
48、 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 the alarm during the audible testing. The audible portion of the signal shall be discernible
49、 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 is demonstrated only when all observers record the correct number of times the alarm w
