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The City of Leavenworth, KS operates a wastewater treatment plant with an average daily capacity of 16.54 MLD (4.38 MGD) with a peak flow rate of 104.98 MLD (27.50 MGD). The plant currently uses trickling filters to remove organics (BOD) and suspended solids. In 2010 the State of Kansas
(KDHE) issued a discharge permit that required disinfection be incorporated into the plant and that a plan be developed to provide nutrient removal. Collimated beam testing was conducted during the month of October 2010. Results of the testing indicated that a fluence (UV dose) of 600 J/m2
would be needed to achieve compliance with either the E, coli permit compliance or future enterococci limits. To confirm the transmittance data, measurements were collected using an on-line HACH UVAS transmittance sensor. This data indicated values more in line with typical values observed
from trickling filter plants. Design transmittance values were developed that resulted in a UVT of 38 percent. Chemical testing was examined as a potential for increasing the transmittance resulting in a reduction in the cost and size of the UV system. The results of these preliminary tests
indicated, with chemical addition, that a higher UVT could be used for design.
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