1、ANSI/AWWA F120-18(First Edition)AWWA StandardSMOzone Systems for WaterEffective date: July 1, 2018.This first edition approved by AWWA Board of Directors Jan. 20, 2018.Approved by American National Standards Institute March 16, 2018.Copyright 2018 American Water Works Association. All Rights Reserve
2、d. iiAWWA StandardThis document is an American Water 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 specifications. The AWWA standards usually co
3、ntain options that must be evaluated by the user 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
4、any product. The use of AWWA standards is entirely 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 industry that the product descr
5、ibed will provide satisfactory service. When AWWA revises or withdraws this standard, an official notice of action will be placed in 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 AWWA
6、 publication of the official notice.American National StandardAn 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 public. The exis
7、tence 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. American National Standards are subject to peri
8、odic 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 conformity wit
9、h particular American National Standards.Caution Notice: 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. ANSI procedures requ
10、ire that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of ANSI approval. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute, 25 West 43rd St
11、reet, Fourth Floor, New York, NY 10036; (212) 642-4900, or e-mailing infoansi.org.ISBN-13, print: 978-1-62576-297-9 eISBN-13, electronic: 978-1-61300-478-4DOI: http:/dx.doi.org/10.12999/AWWA.F120.18All rights reserved. No part of this publication may be reproduced or transmitted in any form or by an
12、y means, electronic or mechanical, including scanning, recording, or any information or retrieval system. Reproduction and commercial use of this material is prohibited, except with written permission from the publisher.Copyright 2018 by American Water Works Association Printed in USAIf you are inte
13、rested in using any part of this publication for training, creating a derivative work, or for any commercial use, written permission from AWWA is required. Please send your request to permissionsawwa.org. Copyright 2018 American Water Works Association. All Rights Reserved. iiiCommittee PersonnelThe
14、 AWWA Standards Committee on Oxygen for Ozone Generation, which reviewed and approved this standard, had the following personnel at the time:Ron D. Joost, ChairGeneral Interest MembersN.L. Burns, Black keeping the system cooler improves generator efficiency.When ozone gas leaves the ozone generator,
15、 it is conveyed to the ozone dissolution system where ozone gas is transferred into the liquid phase. Obtaining dissolution of ozone gas within the process water is typically done by one of the two following methods: Contact basin with fine bubble diffusers. Side stream injection with a gas/water mi
16、xing device.Ozone dissolution systems will place the ozone gas into solution within the process water. Based on the limited solubility and mixing constraints of the dissolution system, there will be a certain amount of ozone that does not dissolve into solution. This Copyright 2018 American Water Wo
17、rks Association. All Rights Reserved. xiundissolved ozone is referred to as ozone vent gas. The ozone that is not dissolved can create safety, hydraulic, and treatment issues by building up a gas bubble within the contacting system; therefore, the undissolved ozone gas needs to be removed from the p
18、rocess water stream. Since ozone gas is a chemical that poses a health hazard to humans (see Part II.A), the ozone vent gas that is undissolved must be treated. Treatment of ozone vent gas involves an ozone destruct unit.See Figure F.1 for a typical process flow diagram of the ozone treatment system
19、 discussed previously.II.D. Power Supply Unit. This standard does not address issues associated with the ozone generator power supply units (PSUs) or the safety concerns related to the supply of power to the PSUs. Recommendations regarding supply of power, operations, maintenance, and safeguards for
20、 the PSUs should be obtained from the ozone generator manufacturer.Liquid Oxygen (LOX)Storage TanksLOXVaporizersOzoneGeneratorsPower SupplyUnitsSupplemental NitrogenSystem (as needed)Gaseous Oxygen (GOX)Ozone Product GasClosed-loop Cooling Water System With Heat ExchangersPowerClosed-loopPumpsPressu
21、re Regulation and GOX FilterLiquid Oxygen (LOX)Ozone Destruct SystemOzone Vent GasTreated Gas to AtmosphereOpen-loopPumpsOzonated WaterOzone Dissolution SystemOpen-loopCooling WaterReturnOpen-loopCooling WaterSupplyHeatExchangerInfluent WaterLegendLiquid Oxygen Gaseous OxygenOzone Product GasOzone V
22、ent Gas Open-loop Cooling WaterClosed-loop Cooling WaterNitrogen GasOzonated WaterInfluent WaterFigure F.1 Process flow diagramNote: Number of units and piping configuration can vary based on project needs.Copyright 2018 American Water Works Association. All Rights Reserved. xiiII.E. Other Considera
23、tions. The user of the standard may want to consider additional requirements for ozone systems that are not addressed in the standard as follows: buildings housing the ozone system, contactor structures, ozone system power distribution equipment, emergency ventilation, and regulatory permits. The us
24、er may want to refer to other appropriate standards and consult with an ozone system professional for further technical details on these items if they are required.III. Use of This Standard. It is the responsibility of the user of an AWWA standard to determine that the products described in that sta
25、ndard are suitable for use in the particular application being considered.III.A. Purchaser Options and Alternatives. The following information should be provided by the purchaser:1. Standard usedthat is, ANSI/AWWA F120, Ozone Systems for Water, of latest revision.2. Ozone system configuration requir
26、ements (Sec. 4.2.2).3. Request for a required number of training materials (Sec. 4.3.8).4. Performance test report (Sec. 4.3.12).5. Details of federal, state, and local requirements (Sec. 4.4).6. For applications other than potable water, whether compliance with NSF/ANSI 61, Drinking Water System Co
27、mponentsHealth Effects, is required (Sec. 4.4.1.1).7. Ozone generator and power supply monitoring options (Sec. 4.5.5.3.3).8. Request pre-installation equipment storage requirements (Sec. 5.2.3).9. Certificate of proper installation (Sec. 5.3.8).10. Training of operation and maintenance personnel (S
28、ec. 5.4).11. Number of printed or electronic operation and maintenance (O it feeds a small amount of nitrogen into the GOX to improve the ozone generators efficiency (energy consumed per unit mass of ozone) in converting GOX into ozone. Typically, this is a small air compressor skid, although nitrog
29、en gas can be used as well. The system can also be termed a “nitrogen boost system.”34. Supplier: The party that provides materials or services. A supplier may or may not be the manufacturer.35. Transfer efficiency: The ratio of ozone consumed within the ozone dissolution system to the amount of ozo
30、ne being applied into the ozone dissolution system.36. Vaporizer: The equipment that is supplied as part of a liquid oxygen system and acts as a heat exchanger in order to allow liquid oxygen to boil, or vaporize, into gaseous oxygen.37. Wastewater: A combination of the liquid and water-carried wast
31、e from residences, commercial buildings, industrial plants, and institutions, together with any groundwater, surface water, and stormwater that may be present.38. Wet chemistry testing: A manual method for determining the ozone concentration, usually in order to calibrate ozone in gas analyzers. The
32、 method is the Unbuffered Potassium Iodide Test Procedure as presented at the March 1992 International Ozone Association Symposium and described by Rakness et al. (1996).Copyright 2018 American Water Works Association. All Rights Reserved. OZONE SYSTEMS FOR WATER 7SECTION 4: REQUIREMENTSSec. 4.1 Req
33、uired EquipmentOzone systems shall include LOX storage and vaporization equipment, GOX filters, pressure-reducing valves, ozone generators and power supplies, cooling systems for generators and power supplies, ozone dissolution systems, ozone destruct systems, ozone systems piping and valves, supple
34、mental nitrogen systems, control systems and instrumentation, related safety equipment and spare parts.Sec. 4.2 Data to Be Provided by the Purchaser4.2.1 Introduction. Purchaser should provide information on proposed ozone generation facilities to establish design requirements for the ozone generati
35、on units and related facilities.4.2.2 General ozone system configuration requirements.4.2.2.1 Production requirements. Purchaser shall provide ozone production requirements for the facility. The production requirements shall include the minimum, rated, and maximum production rates at the maximum or
36、average cooling water temperature and the rated ozone product gas concentration.4.2.2.2 Number of ozone generators. The purchaser shall indicate the number of ozone generators required, including the number of duty and standby generators to meet the capacity requirements of the system. The purchaser
37、 shall also indicate the number of duty and standby units needed for the ozone generator support systems including the LOX storage and vaporization systems, GOX pressure-reducing valves and fittings, cooling water pumps, ozone dissolution systems, ozone destruct systems, and other related facilities
38、.4.2.2.3 Ozone product gas concentration. The purchaser shall indicate the ozone concentration range from minimum to maximum and the rated ozone concentration.4.2.3 Plant water flow and water quality.4.2.3.1 Maximum, average, and minimum treatment plant flow rates. The purchaser shall indicate the m
39、aximum, average, and minimum treatment plant flow rates.4.2.3.2 Upstream treatment. The purchaser shall provide data on the upstream treatment system being used by the plant prior to the ozone application point.Copyright 2018 American Water Works Association. All Rights Reserved. 8 AWWA F120-184.2.3
40、.3 Water quality. In situations where the OSS is responsible for design of the dissolution system, the purchaser shall provide applicable historical and expected water quality data including raw water and treated water characteristics including expected minimum, maximum, and average water quality pa
41、rameters.4.2.4 Ambient environmental and site conditions.4.2.4.1 Indoor and outdoor temperatures. Purchaser shall provide available historical minimum and maximum outside air temperatures and planned indoor minimum and maximum air temperatures.4.2.4.2 Relative humidity. Purchaser shall provide avail
42、able historical minimum and maximum outdoor relative humidity levels and planned maximum and minimum indoor relative humidity levels.4.2.4.3 Site altitude. Purchaser shall provide site altitude data.4.2.5 Design and operation requirements.4.2.5.1 System operation and control descriptions. Purchaser
43、shall provide system operation control descriptions for both manual and automatic operational modes including overall system architecture, instrumentation, and programming services to be provided by the OSS.4.2.5.2 Control system interface with supervisory control and data acquisition (SCADA). The level of monitoring and control shall be specified by the purchaser.4.2.5.3 Characteristics of power provided. The purchaser shall indicate the voltage, fre
