SR0084912_LIQUID WASTE PLAN CHECK

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Criteria for evaluating the analytical results from the testing are described in Section 8.5 of NSF/ANSI Standard 40. In completing the pass/fail determination for the data, an allowance is made for effluent TSS and CBOD5 during the first month of testing. The 30-and 7-day averages during this time may not equal or exceed 1.4 times the effluent limits required for the rest of the test. This provision recognizes that an immature culture of microorganisms within the system may require additional time to achieve adequate treatment efficiency. Effluent CBOD5 and TSS concentrations from the GSF Denitrification DN450 during the first calendar month of testing were within the normal limits and did not need to use this provision. Section 8.5.1.1 of the Standard provides guidance addressing the impact of unusual testing conditions, including sampling, dosing, or influent characteristics, on operation of a system under test. Specific data points may be excluded from 7- and 30-day average calculations where determined to have an adverse impact on performance of the system, with rationale for the exclusion to be documented in the final report. There were no such conditions during this test. Sections 3.6 and 8.2.1 of the Standard define influent wastewater characteristics as they apply to testing under the Standard. Typical domestic wastewater is defined as having a 30-day average BODS concentration between 100 and 300 mg/L and a 30-day average TSS concentration between 100 and 350 mg/L. The 30-day average influent remained inside this specified range for the duration of the test. 3.2 Biochemical Oxygen Demand The five-day biochemical oxygen demand (BODS)and five-day carbonaceous biochemical oxygen demand (CBOD5)analyses were completed using Standard Methods for the Examination of Water and Wastewater 22nd edition. The results of both analyses are shown in Figure 1. Influent BODS: Individual influent BODS concentrations ranged from 100 to 560 mg/L during the evaluation,with an average and median concentrations of 200 mg/L. Thirty day average concentrations ranged from 160 to 240 mg/L. The average influent BODS delivered to the treatment unit was within the influent characteristics defined under Section 8.2.1 of NSF/ANSI Standard 245. Effluent CBOD5: Effluent CBOD5 concentrations ranged from <2 to 48 mg/L over the course of the evaluation,with an average concentration of 9 mg/L and a median concentration was 3 mg/L. 15/10/055/0030 This report may not be reproduced in whole or in part Page 11 of 64 Final Nitrogen Report without the expressed written consent of NSF International June 2019