Metro Vancouver (MV) owns and operates the Coquitlam Water Treatment Facility
(CWTF), which has a rated capacity of 1,200 ML/day (317 MGD) and treats water from
Coquitlam Lake, one of the regions' three water supply sources. This gravity-fed
unfiltered supply is currently treated by a process train that includes ozone and chlorine
for disinfection and soda ash for corrosion control. Under the Coquitlam UV Disinfection
Project, a new ultraviolet (UV) disinfection facility will provide a multi-barrier,
sequential ozone-UV-chlorine disinfection strategy. Under this strategy, ozone will
provide disinfection for 4-log virus inactivation and oxidation for improved UV
transmittance (clarity) of the raw water and disinfection by-product (DBP) precursor
reduction, UV will provide disinfection for 3-log Cryptosporidium and Giardia
inactivation, and chlorine will provide disinfection to maintain a secondary chlorine
residual in the distribution system. In addition, ozone will provide 3-log Giardia
inactivation as a back-up disinfection barrier to UV, and chlorine will provide up to 2-log
virus inactivation as a back-up disinfection barrier to ozone. This paper presents the results of the basis of design phase of the Coquitlam UV
Disinfection Project. It includes a discussion of process design criteria, UV equipment
selection, UV facility layout alternatives and results of the Basis of Design Decision
Workshop. It also presents a discussion of hydraulic issues associated with the VPL
system, including results of a physical model laboratory study undertaken to optimize
inlet hydraulics to the individual UV units. Includes 5 references, table, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.9 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 18 |
| Published : | 11/01/2009 |
