This paper provides a rationale for key assumptions and decisions made to develop the design for
the Ultraviolet (UV) system for the in-plant recycle stream treatment system at the East Bay
Municipal Utility District (EBMUD) Walnut Creek Filtration Water Treatment Plant (WTP).
Results of the analysis are as follows:
Cryptosporidium is the target pathogen for UV inactivation in the recycle stream;
free-swimming pathogens are the basis of UV dose selection;
design dose for the system is 40 mJ/cm2;
acceptable UV systems have
validated UV dose and UV sensor response,
closed-vessel configuration, and
mechanical cleaning of quartz sleeves and UV sensor probes;
UV transmittance of 85% (254 nm and 10 mm pathlength);
approximate Capital Cost of $1.1 million for current conditions; and,
approximate O&M Cost of $0.06 per 1,000 gallon for current conditions. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2.5 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 14 |
| Published : | 06/15/2003 |
