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Flow Data

This report examines flow data from November 3 to November 19, highlighting that outflow consistently exceeds inflow under both sunny and rainy conditions. Possible causes for this anomaly, including measurement errors, recirculation issues, and the impact of oxidizing agents, are explored. Tests conducted include DPD titrimetric and colorimetric analysis, indicating oxidizing agents possibly present in the waste stream, potentially from consumer products. The findings raise important questions regarding the efficiency of septic tanks and overall wetland performance.

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Flow Data

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  1. Flow Data • Sample data taken from Nov 3 to Nov 19

  2. Inflow vs. outflow • Outflow consistently greater than inflow (for both sunny and rainy days with steady cell height) • Instrument error or other unidentified input?

  3. Recirculation Abnormal F1 Surge Normal F1 Problem of F1 reading

  4. Magnetic meters

  5. From F2 to F3 to M4 • M4 should be less than F2 and F3

  6. Discharge From Water Softer Building to LS4

  7. Recirculation Abnormal F1 Surge Normal F1 F1 consistent with surge tank except during recycle. Backflow problem exists.

  8. Expected Errors with open channel flow meters

  9. Sampling Points Effluent LS-4 M-4 ST-1 ST-2 (To city) AS-2 LS-1 F-1 AS-1 M-1 AS-4 LS-3 F-3 ACT-1 M-3 W-3 Wetland Cell (W-1) Wetland Cell (W-2) Recirculation Biofield ACT-2 LS-2 LS-2 M-2 F-2 FS N Not to scale AS-3 Weather station Lift station/Dosing Chamber V notch weir Flow meter Flume Flow meter Automatic Sampling Station Magnetic Flow meter Flow splitter Surge Tank

  10. Wetland Performance

  11. Wetland Performance • Continuing sample analysis • Samples taken from Surge Tank in Oct. & Nov. • Chlorine Test performed in October

  12. Wetland Performance • Chlorine Test • Sample analyzed from AS-2 • DPD Titrimetric test: positive results • Oxidizing agents (Chlorine or other products) may be present in waste stream • Found in antibacterial soaps, cleaning supplies • Possible cause for stress to plants

  13. Upcoming Work • DPD Colorimetric test • Can determine quantity of oxidizing agent present • To be done at more sampling points • Are septic tanks working properly? • Biodegradation occuring, or • Settling system, oxidants bypass • DPD test will give insight

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