CORNELL CEE 453 - Study Notes (17 pages)

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Optimal Time for Anaerobic Digestion for Biological Phosphorus Removal in a Sequencing Batch Reactor Research for CEE 453 Laboratory Methods in Environmental Engineering Fall 2004 By Sarah Kloss and Laura Mar Abstract Our report documents the attempt to determine the optimum anaerobic time in a sequencing batch reactor for biological phosphorus removal We built and ran a sequencing batch reactor with fill anaerobic aerobic settle and drain states The system recycles the phosphorus accumulating organisms PAO that accumulate phosphorus in the aerobic state and release it in the anaerobic state We spent a week developing the PAO and then changed the anaerobic time from 1 5 hours to 0 75 hours and lastly to 3 hours Our data is inconsistent indicating that the system created phosphorus at some times and removed it at others Inconsistencies are likely a result of phosphorus contamination of lab equipment and or samples being left in the anaerobic state allowing for phosphorus accumulation Although we were unable to determine the optimum anaerobic time we were able to refine the procedure process in an attempt to provide a template for future experiments Introduction The addition of discharges into surface waters from municipal treatment plants affects the health of the water body When there are high concentrations of phosphorus in the discharged water eutrophication occurs Eutrophication is the process by which a water body becomes enriched with higher than normal dissolved nutrient concentrations i e phosphorus and nitrogen which promote the rapid growth of algae resulting in algal blooms The result of these algal blooms is decreased oxygen in the water which can cause competing species including numerous fish to die from anaerobic conditions ELA 2004 Thus the motivation for our project is to determine more precisely the optimum times in a sequencing batch reactor for phosphorus removal to be used in municipal plants Past projects have studied biological and chemical



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