AWWA ACE56361

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.

Product Details

Edition:

Vol. - No.

Published:

06/16/2002

Number of Pages:

13

File Size:

1 file , 520 KB