E-Andrew Sindt Creative Component S11.pdf

conditions included a discrete fill strategy with symmetric pulses for influent wastewater and oxygensupply to the system. This strategy was then implemented on a small scale SBR and a significantreduction in batch time was achieved.Furumai et al. (1999) used a modified version of the ASM2 model to predict long term dynamic behaviorof BNR in SBRs. Model parameters were calibrated based on experimental data collected from a labscaleSBR. Following calibration, changes in total organic carbon (TOC), NH 4 + -N, NO 3 - -N, NO 2-- N, andPO 4 3- -P could be readily predicted by the model. To test the model’s ability to predict dynamic behavior,the authors increased and decreased the influent TOC in step-wise manner for 5 weeks. The modelpredictions were found to match experimental results well.Chang et al. (2000) developed a model for BNR in SBRs using material balances and Monod kinetics.Model parameters were determined based on the best fit of predicted results to experimental results ofa lab-scale SBR. Authors found that reduced P uptake during the aerobic period limited overall Premoval. PAO washout was also observed under low organic loading conditions. The model successfullysimulated operations of a full-scale SBR and was useful in optimizing hydraulic retention times.Velmurugan et al. (2010) proposed a simplified SBR model for carbon and N removal in SBRs. Themathematical model contains fewer variables than most other models and was calibrated and validatedbased on data obtained from a full-scale SBR plant treating municipal wastewater. Following validation,the model was used to redesign the existing full-scale plant. The resulting design reduced the reactorvolume by approximately 11% and eliminated a total of 1.99 hours of aeration per cycle.2.5 SummaryFurther investigation of BNR in SBRs is needed to understand how to enhance removal efficiencies andreliability of processes under dynamic conditions.The SBR has been researched extensively in the past in part because of the ease that a one tank processprovides to researchers on a lab-scale level. SBRs also hold the unique advantage of small site arearequirements as compared with conventional activated sludge processes. New effluent nutrientrequirements could result in an additional SBR benefit over conventional: the ability to achieve nearlycomplete BNR without any additional construction. By simply changing the SBR cycle sequence, anoperator could potentially turn an SBR that treats for carbon and nitrogen removal into a BNR process.Accurately modeling the changes to an SBR cycle sequence to find optimum settings beforeimplementation on a full-scale level could save the operator significant time and money.Currently, most of the studies completed on BNR modeling focus on developing new models and not onapplying developed models to full-scale processes. No papers were found in which the investigatingauthors did not have a direct connection to the development of the model being investigated.Specifically, no papers were found on calibrating the BioWin wastewater simulator to predict effluentcharacteristics by a third party investigator. More information is needed on typical simulator parametervalue ranges and calibration techniques for smaller sized wastewater treatment facilities that havelimited amounts of data available.27