SR0084912_LIQUID WASTE PLAN CHECK

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3.4 pH Over the entire evaluation period, the influent pH ranged from 6.4 to 8.2 (median of 7.1). The effluent pH ranged from 6.0 to 6.8 during the evaluation (median of 6.4) within the 6 to 9 range required by NSF/ANSI Standard 245. The pH data for the evaluation are shown in Appendix C. 3.5 Temperature Influent temperatures over the evaluation period ranged from 7 to 22°C(median of 180C). The temperature data are shown in Appendix C. The Standard requires that the average influent temperature fall within 10 to 30 °C. The average influent temperature was within the characteristics defined under Section 8.2.1 of NSF/ANSI Standard 245. 3.6 Dissolved Oxygen Dissolved Oxygen (DO) was measured in the effluent during the evaluation. The effluent DO ranged between 0.2 to 9.6 mg/L (median of 2.9 mg/L). All dissolved oxygen data are shown in Appendix C. 3.7 Alkalinity Alkalinity analyses were completed using Standard Methods for the Examination of Water and Wastewater 22nd edition. The alkalinity results over the entire evaluation are shown in Figure 3. The influent and effluent alkalinities were all well within the range required by the Standard, and review of the nitrogen data indicates that alkalinity was not a limiting factor for nitrification in the system. Influent Alkalinity The influent alkalinity averaged 200 mg/L, ranging from 120 to 410 mg/L,with a median concentration of 195 mg/L. The influent alkalinity delivered to the treatment unit was within the influent characteristics defined under Section 8.2.1 of NSF/ANSI Standard 245. Effluent Alkalinity The effluent Alkalinity concentration ranged from 140 to 290 mg/L during the period when alkalinity samples were collected, with an average concentration of 210 mg/L and a median concentration of 220 mg/L. 15/10/055/0030 This report may not be reproduced in whole or in part Page 14 of 64 Final Nitrogen Report without the expressed written consent of NSF International June 2019