ANSI AWWA F120:2018 pdf download.Ozone Systems for Water
This standard describes the minimum requirements for ozone systems and equipment used to treat potable water, wastewater, reclaimed water, and storm water. 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.
The following definitions shall apply in this standard.
1. Catalyst: The material contained within the ozone destruct unit to convert any remaining ozone in the contactor vent-gas back to oxygen. Catalyst is typically manganese dioxide.
2. Closed-loop: The portion of the ozone generator cooling water system that is not open to the atmosphere and supplies water directly to the ozone generators. This system typically runs through a heat exchanger that transfers heat generated in the ozone generator to an open-loop cooling water system that returns water to a cooling tower or other open source.
3. Contactor: A structure or vessel that allows residence time for the ozone to react in the water (typically a basin, tank, or pipeline).
4. Constructor: The party that provides the work and materials for placement or installation.
5. Conventional type ozone generator: An ozone generator with a separate power supply unit. Ozone is generated by conveying an oxygen-laden gas across an electrical field induced by placing a dielectric material between two electrodes.
6. Dew point temperature: A measure of moisture content of a gas based on the temperature at which water condenses from a gas. This is specifically a concern for the feed gas to an ozone generator as excessive moisture will reduce generation efficiency.
7. Dielectric: The material or component inside an ozone generator that provides the necessary electrical resistance between the electrode and the ground to create an electrical field.ANSI AWWA F120 pdf download.