AWWA COMMENT PERIOD ON AWWA F120, Ozone Systems for Water

AWWA COMMENT PERIOD ON AWWA F120, Ozone Systems for Water
April 15, 2024

AWWA solicits public comments on all proposed new AWWA Standards, and on all proposed revisions, reaffirmations, or withdrawals of existing AWWA Standards. The referenced standards project is being considered for approval and the publication of this notice begins the 45-day public comment period for AWWA and ANSI. An electronic public review copy of the proposed standard can be obtained for review during the comment period by emailing ETS Support (ETSsupport@awwa.org). Comments must be submitted in writing to the AWWA contact listed below no later than the last day of the comment period specified herein. Such comments shall be specific to the section(s) of the standard under review and include sufficient detail so as to enable the reader to understand the commenter’s position, concerns and suggested alternative language, if appropriate.

AWWA Comment Period closes on June 6, 2024.

Send comments to:

Liz Ralph, LRalph@awwa.org
303.347.6177 phone

The review copy will be edited for publication and may also be revised as appropriate based on any comments received during the public comment period. Therefore, this copy is not suitable for continued utilization and is intended only for comment purposes.

Final publication of the standard may take several months. When it is available, a notice will be published in the official notice section of Journal – American Water Works Association. The standard becomes an effective AWWA standard on the first day of the month following such publication in Journal – American Water Works Association.

SCOPE

This standard describes the minimum requirements for ozone systems and equipment used to treat potable water, wastewater, reclaimed water, and stormwater. This standard covers high concentration ozone generation equipment using discharge dielectrics and modular-type ozone generators fed from oxygen gas vaporized from a liquid oxygen (LOX) storage system. Equipment under this standard includes ozone generators with associated ancillary equipment, design considerations, and testing requirements. Both fine bubble diffusion and sidestream ozone dissolution systems are described in the standard. For ozone destruct systems, both thermal-catalytic and thermal systems are described.

MAJOR REVISIONS

Major revisions made to the standard in this edition include the following:
1. Updated Sec. I.C. Acceptance in the Foreword with the latest Standards Council language reflecting the addition of reference to NSF/ANSI/CAN 372 and NSF/ANSI/CAN 600.
2. Sec. II.C. Assumed Ozone System Configuration in the Foreword was updated to include the use of water chillers and Fig. F.1 was revised for consistency with standard terminology.
3. Updated Sec. II.E Other Considerations in the Foreword to address air changes.
4. In Sec. 3 added definitions for impingement velocity, ozone vent gas, and stormwater.
5. Added a new Sec.4.2.5.1 for instrumentation and control equipment preferences.
6. Add a new Sec. 4.2.13 for wind design criteria.
7. Added a new Sec. 4.3.2.4 on feed gas quality requirements.
8. Updated Sec. 4.4 Materials for Oxygen and Ozone Systems with the latest Standards Council boilerplate language.
9. A new Sec. 4.5.1.3.4 for electric vaporizer design criteria was added.
10. Sec. 4.5.2.1.2 Power supplies was updated.
11. Sec. 4.5.3.3 Sidestream injection was updated to improve clarity and illustrate a wider variety of arrangements.
12. In Sec. 4.5.4.2 Design, the typical design vacuum pressure was added for ozone destruct blowers.
13. In Sec. 5.3.3 Oxygen cleaning, a sentence was added on the use of qualified personnel to perform oxygen cleaning.
14. In Sec. 6.1.3.3 Generator production capacity, information was added on testing to verify design conditions and factory testing reports.
15. In Sec.6.2.2.1 two additional items were added for shutdown and startup and roatation operation.
16. Sec. 6.3.2 Protocol was revised to include an alternative calibration method.
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17. In Sec. 6.3.3 Activities, a paragraph on generator specific energy values was added.
18. Table A.1 Exposure hazards of ozone was updated to include a condition for typical ozone generator production concentration.
19. A paragraph was added to Section A.7 Equipment Purge Precautions addressing purging of piping and generators.