The Catskill and Delaware watersheds supply New York City with up to 90% of the
nearly two billion gallons of water consumed daily. Although unfiltered, these upstate
supplies are of high quality. Because of the high quality raw water supply and the
extensive watershed protection program, the New York City Department of
Environmental Protection (DEP) has been granted a Filtration Avoidance Determination
(FAD) by the United States Environmental Protection Agency (EPA). As part of the
FAD, the NYCDEP must proceed with the design and installation of ultraviolet (UV) disinfection
facilities, even though the promulgation of regulations governing enhanced disinfection
are still several years off. The purpose of this paper is to report on the feasibility of UV
disinfection for large utilities and the unique set of design challenges that must be
addressed.
The design of a UV disinfection facility for New York City's Catskill and Delaware
supplies poses several unique design challenges due to the scale of the facility (2,020
mgd), the unfiltered state of the water being treated and the relative infancy of UV
technology. Challenges that have been encountered include the need to provide a facility
that meets the required design goals under all operating conditions and raw water
qualities, is highly reliable, and maintains the present operational flexibility of the system.
Additional challenges in designing the world's largest UV disinfection facility include
maintaining a schedule ahead of regulatory promulgation, maintaining operational
flexibility in the overall system both now and in the future and ensuring that the UV
equipment that will be provided for this facility can be validated to meet the design
criteria. Includes 2 references, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 710 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 16 |
| Published : | 11/02/2003 |
