E-Andrew Sindt Creative Component S11.pdf

used model is the Activated Sludge Model 1 (ASM1) (WEF MOP no. 31, 2009). It is important to notethat IWA models are limited to carbon and nitrogen removal. Further details on IWA models areincluded in the following publications: Grady et al. (1986), Henze et al. (1987a, 1987b), and Gujer andHenze (1991) (Melcer et al., 2003).2.4.2 EBPR models (summarized from Melcer et. al, 2003)EBPR has been addressed in several of models including those developed by Comeau et al. (1986),extended and modified by Wentzel et al. (1986), and by Mino et al. (1987). All three of these models aregenerally in agreement with each other concerning biochemical control mechanisms and the essentialrequirements for a system to achieve EBPR. An additional BNR model was developed by Dold (1990,1991) which combines the ASM1 model for heterotrophic and autotrophic organisms (Henze et al.1987a, 1987b) and the Wentzel et al. (1989a) model for PAOs with a number of extensions andmodifications incorporated throughout. After the initial development of the combined nitrification,denitrification, and EBPR model (Dold, 1990, 1991), extensive evaluations were completed using datafrom laboratory-scale and full-scale treatment plants. The evaluations provided further refinement tothe model. Barker and Dold (1997) presented a summary of the resulting model which now includes,among other things, fermentation processes and hydrolysis of enmeshed slowly biodegradable CODunder anoxic and anaerobic conditions (Barker and Dold, 1997).2.4.3 BioWin Wastewater Process SimulatorBarker and Dold (1997) provided the basis for a wastewater simulator named BioWin (EnviroSim, 2010).The BioWin wastewater simulator provides a user-friendly interface for evaluating wastewatertreatment plant performance. A simulator incorporates multiple models, set or sets of equations solvedin a matrix, to describe each individual wastewater treatment process (WEF MOP no. 31, 2009). BioWinutilizes multiple icons which represent different unit processes in wastewater treatment (e.g., aerationbasin, clarifier, SBR). Each unit process may include multiple sub-models that describe individualcomponents of the unit process. For example, the SBR module, represented by a single icon, containssub-models used to describe aeration basins as well as clarifiers.2.4.4 Simulator Influent Data RequirementsInfluent wastewater characteristics can vary widely depending on many factors. The most prominentfactor is industrial contributions to municipal wastewater streams. Wastewater simulators require asignificant amount of data in order correctly characterize the wastewater for each specific application.Useful data include parameters regularly monitored by operators such as influent cBOD, TSS, TKN andammonia-nitrogen as well other parameters that may not be regularly monitored, if ever. Examples ofparameters not regularly monitored include influent VSS, filtered COD, flocculated and filtered COD,filtered cBOD 5 , ortho-phosphate, and influent acetate. These parameter values are needed in order toappropriately fraction COD, nitrogen, and phosphorus. An example of COD fractionation for BioWin isgiven in Figure 2.10. Fractioning is required in order to define the state variables (e.g., fraction ofunbiodegradable particulate COD, up) upon which wastewater models are built (WER MOP no. 31,2009). This subject is covered in great detail in the WERF publication Methods for WastewaterCharacterization (2003).25