The use of ultraviolet light (UV) has emerged as a cost-effective way to disinfect
cryptosporidium, giardia and other microorganisms in water treatment plants. UV
disinfection will play a major role for water plants in meeting the upcoming Stage 2
Disinfectants/Disinfection Byproducts Rule (DBPR) and the Long Term 2 Enhanced
Surface Water Treatment Rule (LT2ESWTR) regulations. One of the most important
aspects of UV disinfection is to ensure that the UV system is delivering the appropriate
UV dose. Although biodosimetry testing is the ultimate way to determine a UV reactor's
disinfection performance, mathematical models are useful in reactor design and in the
application of biodosimetric challenged reactors in water plants. They also give you
information on dose distribution, which cannot be obtained through biodosimetric
challenge testing. A calculated dose distribution can be determined through particle
tracking by performing Computational Fluid Dynamics (CFD) modeling and overlaying
the fluence rate of the reactor with the CFD models. The dose distribution can then be
used to determine delivered dose to challenge microorganisms such as MS2 and B.
subtilis. Various conditions were explored such as the use of doped sleeves versus
standard GE214 and different water absorbance values. The detailed methods used to
calculate delivered dose are discussed.
Includes 6 references, table, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 520 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 13 |
| Published : | 06/16/2002 |
