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Impact of UV Intensity Sensor Properties and Positioning on Dose Delivery Compliance Monitoring for Monochromatic and Polychromatic UV Disinfection Systems

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Dose delivery by an annular reactor equipped with either a low or medium-pressure mercury arc lamp and UV intensity sensor measurements are modeled. Plots of MS2 Reduction Equivalent Dose versus measured intensity are used to demonstrate two approaches towards monitoring dose delivery by UV reactors. The first approach uses a UV intensity setpoint to guarantee dose delivery and the second uses a UV intensity setpoint with a UV transmittance setpoint. UV sensor placement, spectral response, and opening angle impact the relationship between delivered dose and measured intensity. An optimal sensor location may be defined with each monitoring approach. With the intensity setpoint method, the optimal position occurs where delivered dose is proportional to measured UV intensity. This position depends strongly on the hydraulic efficiency of the reactor, and the spectral response of the sensor for those reactors using polychromatic lamps. The optimal position varies slightly with sensor opening angle. The magnitude of the measured intensity varies strongly with opening angle and spectral response. With the UV intensity setpoint/UV transmittance setpoint approach, the optimal UV intensity sensor position is relatively close to the lamp. The protocol used to validate UV reactors will vary depending on the approach used to monitor delivered UV dose.
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Document Type: Research Article

Publication date: 01 January 2002

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