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A Study on Optimizing Biological Phosphorous Removal by Changing Aerobic Operating Times

A Study on Optimizing Biological Phosphorous Removal by Changing Aerobic Operating Times. Phillip Dixon and Juan Diaz-Robles CEE 453 Laboratory Research in Environmental Engineering December 11, 2004 Cornell University Ithaca, NY 14850. Topics To Be Covered.

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A Study on Optimizing Biological Phosphorous Removal by Changing Aerobic Operating Times

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  1. A Study on Optimizing Biological Phosphorous Removal by Changing Aerobic Operating Times Phillip Dixon and Juan Diaz-Robles CEE 453 Laboratory Research in Environmental Engineering December 11, 2004 Cornell University Ithaca, NY 14850

  2. Topics To Be Covered • Introduction to Phosphorous Removal • Experimental Objectives • Materials and Methods • Setup • Procedures • Results and Conclusions • Suggestions • References • Questions?

  3. Introduction to Phosphorous Removal • Phosphorous is a Nutrient Essential to Plant Growth • Responsible for Eutrophication • Interferes with the Health and Diversity of the Water Body • Blooms of Algae • Clouds Water • Underwater Grasses Die • Fish Kills

  4. Introduction to Phosphorous Removal • Very Important for WW Treatment Plants to remove Phosphorous from effluent • Phosphorous Removal Accomplished by • Exposing the WW to an aerobic/anaerobic sequence in a Biological Reactor

  5. Introduction to Phosphorous Removal • Aerobic/Anaerobic sequence will cause the reactor to select for phosphorous removing microorganisms • Anaerobic Sequence Phosphorous Removing Microbes Release Phosphorous to Produce Energy to take up Fermentation Products • In the Aerobic Sequence the Microbes produce energy by oxidizing the fermentation products and simultaneously take up phosphorous • The Phosphorous is Removed from Solution as Intercellular Phosphorous in the Form of Sludge

  6. Introduction to Phosphorous Removal • Phosphorous removal can be optimized by varying aerobic and anaerobic operating times • Something that was Researched throughout this Project

  7. Experimental Objectives • The Research’s Objective was to find the effect on Phosphorous Removal when Aerobic Operating Times were changed while maintaining a Constant Anaerobic Operating Time

  8. Materials and Methods • Setup • Refrigerator • Wastewater influent • Tap water influent • Samples collected

  9. Materials and Methods • Setup • Peristaltic pump • Air source • Reactor • Pressure sensor • Stirrer • Effluent (Drain)

  10. Materials and Methods • Procedures • States in reactor cycle • Influent wastewater (140 mL) • Influent tap water (2.66 L) • Anaerobic phase (1.5 h) • Aerobic phase (3, 4.5, and 6 h) • Settle (1 h) • Drain (up to 1.2 L) • Samples collected twice a day (minimum of 8 h apart)

  11. Materials and Methods • Procedures • Colorimetric wet chemistry technique • Intensely colored antimony-phopho-molybdate complex • Blue-colored in acid medium (ascorbic acid) • Color proportional to phosphorous concentration • Combined color reagent • 4.9 N H2SO4 (50 mL) • Ammonium molybdate solution (15 mL) • Ascorbic acid solution (30 mL) • Antimony-tartrate solution (5 mL)

  12. Materials and Methods • Procedures • 950mL of E-pure water • 50mL of Sample • 160mL of Reagent

  13. Results and Conclusions • Removal and “Production” of Phosphorous • Results suggest that there is little evidence of Phosphorous Removal • Tried collaborating with another group • varied anaerobic operating time while keeping aerobic operating time constant • Results suggest little evidence of Phosphorous Removal • We have no recommendations on the Optimum Operating times for Phosphorous Removal

  14. Results and Conclusions

  15. Suggestions • Precise manner in mixing the components for the combined color reagent • Samples should be diluted prior measuring in the spectrophotometer • Collect samples shortly after the draining stage of a cycle has been completed • Collect samples without sludge particles • Analyze samples shortly after collected or refrigerate them before analysis

  16. References CEE 453 Phosphorous Measurements. “Phosphorus Measurements.” December 7, 2004. http://ceeserver.cee.cornell.edu/mw24/cee453/ Lake Champlain Basin Program. “Phosphorus Pollution.” December 3, 2004. http://www.lcbp.org/phospsum.htm US EPA. “Eutrophication.” September 8, 2003. http://www.epa.gov/maia/html/eutroph.html Wisconsin Department of Natural Resources. “Wastewater Characterization for Evaluation of Biological Phosphorous Removal.” April 29, 2003. http://www.dnr.state.wi.us/org/water/wm/ww/biophos/1intro.htm Pictures of the laboratory setup are courtesy of Sarah.

  17. Environmental Engineers’ efforts are in trying to avoid…

  18. THANK YOU QUESTIONS?

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