Low Pressure – High Output UV Is it the Wave of the Future?
Abstract:Low pressure-high output (LP-HO) UV systems have recently made their way into the wastewater industry in North America. Advances in technology have led to the use of LP-HO lamps that produce the same monochromatic emissions at a wavelength of 254 nm as traditional low-pressure (LP) systems. This reduces the number of lamps claimed by the vendors from 40 - 50 per mgd for LP systems to 2 -12 per mgd for LP-HO systems. The energy demand is similar to that of traditional low-pressure systems, ranging from 1.8 to 3.8 kW input power per mgd for disinfecting secondary effluent to 200 fecal coliforms per 100 mL, which is significantly lower than the 6.8 - 14 kW input power per mgd demand exerted by medium pressure UV systems. Vendors who supply LP-HO systems are also including automatic cleaning systems as part of the design package, which makes these systems very attractive to treatment plant personnel.
The purpose of this paper is to identify the typical vendors of this type of equipment and to determine its acceptance into the wastewater markets rather than to discuss the impacts of UV on wastewater markets. Information was collected from the identified vendors on installations both in the US and internationally. Results of the survey indicate that the LPHO systems are being used to disinfect a wide variety of effluents ranging from stormwater to reclaimed water. Staff from a cross section of US facilities using equipment supplied by each vendor was interviewed in a telephone survey to determine their opinion about the equipment.
Overall, LP-HO UV technology appears to have made an impact on the wastewater market worldwide, and is being used more and more often when disinfection systems are upgraded, making it the wave of the future for UV disinfection systems.
Document Type: Research Article
Publication date: 2002-01-01
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