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EXECUTIVE SUMMARY <br /> Testing of the E1jen Corporation GSF Denitrification System DN450 was conducted under the provisions of <br /> NSF/ANSI Standard 245 for Residential Wastewater Treatment Systems (April 2013 revision). NSF/ANSI <br /> Standard 245 was developed by the NSF Joint Committee on Wastewater Technology. <br /> The performance evaluation was conducted at the Massachusetts Alternative Septic System Test Center <br /> (MASSTC), located in Bourne, Massachusetts, using wastewater diverted from the Otis Air National <br /> Guard Base municipal wastewater collection system, which serves the base residential development. <br /> The evaluation consisted of sixteen weeks of dosing at design flow, seven and one half weeks of stress <br /> testing and an additional two and one half weeks of dosing at design flow. Sampling started in the <br /> summer and continued through the fall and winter, covering a range of operating temperatures. <br /> Over the course of the evaluation, the average influent Total Nitrogen was 35 mg/L, ranging between 26 <br /> mg/L and 57 mg/L. The DN450 produced an average effluent Total Nitrogen of 15 mg/L, which resulted in a <br /> 57% reduction in the influent Total Nitrogen. The DN450 produced an effluent that successfully met the <br /> performance requirements established by NSF/ANSI Standard 245. <br /> The DN450 produced an effluent that successfully met the performance requirements established by <br /> NSF/ANSI Standard 40 for Class I effluent: <br /> The maximum 7-day arithmetic mean was 34 mg/L for CBOD5 and 32 mg/L for total suspended <br /> solids, both below the allowed maximums of 40 and 45 mg/L respectively. The maximum 30-day <br /> arithmetic mean was 25 mg/L for CBOD5 and 21 mg/L for total suspended solids, both below the <br /> allowed maximums of 25 mg/L and 30 mg/L respectively. <br /> The effluent pH during the entire evaluation ranged between 6.0 and 6.8, within the required range of 6.0 to <br /> 9.0. The DN450 met the requirements for noise levels (less than 60 dbA at a distance of 20 feet), color, <br /> threshold odor, oily film and foam. <br /> 15/10/055/0030 This report may not be reproduced in whole or in part Page 2 of 64 <br /> Final Nitrogen Report without the expressed written consent of NSF International June 2019 <br />