Light intensity models for annular UV disinfection reactors

Abstract

The finite-length lamp model was compared to the infinite-length lamp model (or parallel radiation model) for annular reactors, specifically for the purpose of calculating average light intensities. Based upon the specified conditions that both models must apply equal energy to a reactor, such as is expected when the average surface flux of energy is measured by a chemical actinometric method, the results for the average intensity were very similar for the two models. Long lamp length and short reactor radius favored conditions where the finite-length model predicted a slightly higher average intensity than that calculated using the infinite-length model.The inactivation of f2 virus was predicted in a completely mixed flowthrough reactor using kinetic data obtained from batch reactions. For the particular flow-through reactor used, very little difference for the average intensity was calculated using the two intensity models. Indeed, predictions of reaction results using both models yielded results well within the range of experimental error.

Modeling of UV dose distribution in a thin-film UV reactor for processing of apple cider

“…The absorption of light between the line source and the quartz surface is neglected. The light intensity, I, at any receptor point in the reactor is related to the surface flux, I 0 , by an one dimensional form of Lambert's law of absorption (Suidan & Severin, 1986):…”

A computational study of the effect of lamp arrangements on the performance of ultraviolet water disinfection reactors

“…These steps are briefly discussed here, and more details are can be found in our recent work (Xu et al, 2013). First, a Multiple-Point Source Summation (MPSS) model (Suidan and Severin, 1986) was used to calculate the UV-FR field inside the reactor, with the aid of MATLAB. Refraction (Snell's Law), reflection (Fresnel's Law) and light absorption by each medium (BeerLambert's Law) were taken into consideration (Bolton, 2000).…”

Modelling and control of systems with flow

“…Finally, we consider the first order reaction mechanism as proposed in [44], using results from [10], [79], and [85]. This is described by the disinfection reaction rate…”

“…However, since the residuals are toxic to aquatic life [105], and since some byproducts of chlorination have been proven to be mutagenic, the environmentally friendly UV disinfection method has been stimulated as an alternative [3,101]. In [10,13,79,85,107,108] design and modelling of a photoreactor for disinfecting drinking water is proposed. In [54,55,76,77,112] experimental results are presented that link the UV dosage to the inactivation of microorganisms in wastewater treatment in agriculture and horticulture.…”

“…Disinfection by UV irradiation is a common method for purification of drinking water [3,101]. A lot of experimental research is conducted on the effect of UV light on the attenuation of microorganisms [54,55,76,77,112], and on the mathematical modelling of UV reactors [10,13,79,85,107,108]. The disinfection rate can be dynamically adjusted by the intensity of the UV radiation.…”