The objective of this project was to determine the impact of hydraulic dispersion
on the calibration of a flow-though model ultraviolet (UV) disinfection system with chemical
actinometry (potassium ferrioxalate) and MS 2 bacteriophage. Fluence was supplied by a
medium-pressure ultraviolet lamp to a quartz tube (19 mm dia.) situated in a ventilated
galvanized casing. The UV lamp was attached to a vertical position guide, for UV fluence
to be varied by positioning the UV lamp at various vertical heights above the quartz tube.
Water was pumped through the quartz tube at rates of 100 - 300 mL/min. An in-line pipe
mixer was installed prior to the UV system to ensure adequate mixing with the bulk
liquid and chemical actinometer and to mitigate jet formation within the quartz tube.
Tracer studies were conducted with and without the in-line mixer using potassium
chloride (3 mM). Dispersion coefficients were obtained from the tracer study and
incorporated into an axial-dispersion model to determine the rate coefficient of potassium
ferrioxalate in the model UV system. A numerical model was used to determine the
fluence supplied by the lamp with a reduction in exposure time. After dispersion and
kinetics are accounted for within the UV system, the model predicted UV fluence that
was in general agreement with UV design curves for inactivation MS 2 bacteriophage.
The differences in the design curves and the fluence-response model in the present
investigation were found to be related to the experimental errors introduced from using a
flowing system and because a medium pressure lamp was used in the present
investigation.
Includes 17 references, table.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 280 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 10 |
| Published : | 11/01/2002 |
