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CHANGES SINCE STOAT 4.0 CHANGES SINCE STOAT 4.0 CONTENTS CONTENTS MODEL-BUILDING WIZARD NEW PROCESS TOOLBOX NEW PROCESS SYMBOLS ANNOTATION NEW GRAPHICS MODIFYING THE X AND Y AXES ADDING YOUR OWN DATA ALTERING THE APPEARANCE OF PLOTTED LINES ADDING A TITLE MOVING THE LEGEND NEW MENU ITEMS INFLUENTS MATHS OPTIONS SSVI/SVI SPECIFICATION TOWER REACTORS NEW PROCESS MODELS BATCH RUNS ADDITIONAL TOOLS ZOOM WINDOWS CALCULATOR INTEGRATED CATCHMENT SIMULATOR STOAT DEFAULTS FILE HELP ABOUT INFORMATION

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  • CHANGES SINCE STOAT 4.0CHANGES SINCE STOAT 4.0

    CONTENTSCONTENTS

    MODEL-BUILDING WIZARDNEW PROCESS TOOLBOXNEW PROCESS SYMBOLSANNOTATIONNEW GRAPHICS

    MODIFYING THE X AND Y AXESADDING YOUR OWN DATAALTERING THE APPEARANCE OF PLOTTED LINESADDING A TITLEMOVING THE LEGEND

    NEW MENU ITEMSINFLUENTSMATHS OPTIONSSSVI/SVI SPECIFICATIONTOWER REACTORS

    NEW PROCESS MODELSBATCH RUNSADDITIONAL TOOLS

    ZOOMWINDOWS CALCULATORINTEGRATED CATCHMENT SIMULATORSTOAT DEFAULTS FILEHELP ABOUT INFORMATION

  • MODEL-BUILDING WIZARDThere is a wizard provided to help you build some commonflowsheets quickly. When you install STOAT the wizard will start eachtime you start STOAT. You can choose whether or not you want thisto be your default by selecting Options/Wizard. A tick next to Wizardwill mean that the wizard will be displayed each time you startSTOAT.

    You can also use the wizard at any time by selecting Tools/Wizard.

    The current works and run will be saved and then the wizard willbegin.

  • You will be given the option of building one of seven layouts:

    a primary settlement tank only an activated sludge system with no primary settlement a biological filter system with no primary treatment an activated sludge system with a primary settlement tank a biological filter system with a primary settlement tank a rotating biological disk system a sequencing batch reactor system

    Each option will take you through a series of screens where you willbe asked to enter information necessary to size the works. Anexample of one is given in the next illustration.

  • You can get help on each item by leaving the mouse over the datavalue, when a text box containing a short message will be displayed.

  • NEW PROCESS TOOLBOX

    The process toolbox has been reorganised to provide a hierarchicalview of the available processes. This should make working with thelong list of processes easier. Select the group of processes you wantto work with - for example, suspended growth processes (such asactivated sludge). Double-click on the name. The process list willexpand to show the available processes.

  • Click once with the left mouse button on the process you wish tochoose. Release the left mouse button. Unlike previous releases ofSTOAT there is no need to keep the mouse button down whiledragging the symbol over to the drawing board. Once the symbol iswhere you want it over the drawing board, click the left mouse buttononce to drop the symbol onto the drawing board.

    By clicking on any of the sides or corners of the process toolbox it ispossible to resize the toolbox. This allows you to resize the toolbox toview elements, rather than using the horizontal and verticalscrollbars. You can also use the resizing to roll up the processtoolbox, as the next figure shows.

  • NEW PROCESS SYMBOLSSTOAT now supports two sets of symbols. The first set is thecolourful symbols used in previous STOATs. The second set isdesigned to provide a more engineering drawing feel. We havetaken the opportunity with the new symbols to locate inlets andoutlets to processes so as to make it easier for you to draw straightlines connecting the tanks together.

    You can switch between the old and the new symbols when you firststart STOAT, by selecting Options/Classic symbols. When the tickmark is next to Classic symbols the old symbols will be used; whenthe tick mark is removed the new symbols will be used. You will onlyget this option when there are no works open.

  • ANNOTATIONYou can now display a legend, giving details of the works name, thecreators of the model, and other notes, and also the names ofindividual processes. You can show the legend by selectingEdit/Legend - a tick next to Legend will display the legend. You canalso display all the process names by selecting Edit/Show names,and again a tick next to Show names will display all the names, whileremoving the tick will hide all the names.

    An example of this is shown next. The names can be draggedaround the screen and placed where you want.

    The legend can also be dragged around the screen and placedwhere you want. However, any time you scroll the screen the legendwill automatically be relocated at the lower right-hand corner of theflowsheet.

  • You can also display the names of processes individually, by right-clicking over the process and selecting Show name to show a nameor Hide name to hide a name. The name used is the name youspecified when creating the model, and can be changed using Inputdata/Name and dimensions. If you change the name of a processwhen that name is displayed this will not be reflected on the screenuntil you hide the name and show it again.

  • You can edit the contents of the legend by selecting Edit/Legend,which will allow you to change the name being displayed for theworks, to identify the creator and creation date, and to have anyadditional notes you want displayed.

  • The font for an individual name can be changed by right-clicking overthe name and selecting Font. This applies both for process namesand the legend.

    You can also change the font for all displayed names, by selectingTools/Fonts/Label .

  • NEW GRAPHICSThe graphic presentation used in previous releases of STOAT hasbeen replaced in this version. This new graphic engine has beenchosen because it is much faster than the previous one. As before,you can customise the graphics by right-clicking over the graph,when you will get the graphic property dialogue.

    Modifying the X and Y axes

    By selecting the Axes tab you can alter the scales of the X and Yaxes. You can also change the values for a second Y-axis. STOATdoes not currently use the second axis, but you could use the secondaxis for your own data.

    By changing the maximum and minimum values you can display datafor only that part of the graph that interests you. Any data that liesoutside the selected maximum and minimum values will not bedisplayed.

  • STOAT defines a default title for the X-axis, but not for the Y-axis.You can add your own title for the Y-axis, and change the default forthe X-axis.

  • You can also specify that you want a grid to be displayed, and howyou want the grid lines to be drawn.

    Adding your own data

    You can add your own data to either Chart group 1, displayed on theY-axis, or Chart group 2, displayed on the second Y-axis.

  • The Data section will initially display the number of series - thenumber of data elements (e.g. flow or BOD) that STOAT will displayand the number of points currently defined. You can add your owndata by increasing the number of series by the number of new dataelements that you wish to add. You can then change the number ofpoints to reflect the number needed for the STOAT display. Forexample, if the simulation lasts 1000 h, with data output at 30 minuteintervals, STOAT will set the X-values to be 0, 0.5, 1, 1.5, etc. Any X-values that you specify will be over-written by the STOAT values. Youshould therefore set the number of data points with this in mind. Forexample, suppose you have 10 data points measured at 1, 2, 5, 10,40, 100, 200, 300, 400 and 500 hours. You would have to specify thatthe number of points should be at least 1000: 500 hours / 30 minutes.(At the end of the simulation STOAT will have increased this to 2000points). You would then enter your data at data points 2, 4, 10 and soon, and set the X value and Y value accordingly. If you have a lot ofdata the quickest way to do this may be clicking on Edit when you willget a simple spreadsheet view of the data. Missing data isrepresented by whatever value is specified for Hole, and by default is10308.

  • Once you have entered your data you can choose to save the result,and this can then be loaded back for re-use in subsequent STOATruns.

    Having entered your data you may wish to specify a label to be usedin the legend, so that you can more readily identify the data points.

  • Altering the appearance of plotted lines

    By selecting Chart style you can alter the appearance of the linesplotted on the graphs. Line style will allow you to change thethickness and colour of the lines, or to prevent any lines being drawn,while Symbol style allows you to specify that symbols should bedrawn or not drawn, and to select the symbol shape, colour and size.

  • Adding a title

    Use Titles to add a title. You specify whether the title is to bedisplayed above or below the chart (header or footer), and use Labelto enter the title text.

    Moving the legend

    STOAT displays the legend by default to the right of the graph andcentred between the top and bottom. You can change the location byusing Legend. General allows you to quickly specify where the legendshould be displayed, and finer control is available by using Location.However, it is not possible to display the legend within the plot area,so that as you move the legend around you will see the graph besqueezed into the available area left.

  • NEW MENU ITEMS

    Influents

    There are two new influent options: BOD and COD. The originalSTOAT influent profile has been renamed as Advanced. BOD andCOD have been designed to simplify the data requirements forcreating these profiles.

    These files are also available when you read in influent files. As thenext screenshot shows there is also a simplified file format forrainfall.

  • The BOD profile will ask for data for only

    Flow Temperature Soluble BOD Particulate BOD Volatile suspended solids Non-volatile suspended solids Ammonia Nitrate

    The COD profile requires the following data

    Flow Temperature Volatile fatty acids as a COD equivalent Soluble biodegradable COD, excluding VFAs Soluble non-degradable COD Particulate biodegradable COD Particulate non-degradable COD Volatile suspended solids Non-volatile suspended solids

  • Ammonia Nitrate (*) Soluble biodegradable organic nitrogen Particulate biodegradable organic nitrogen Soluble inorganic phosphorus Dissolved oxygen (*) Soluble non-degradable organic nitrogen (*) Particulate organic non-degradable nitrogen (*) Particulate biodegradable organic phosphorus Particulate non-degradable organic phosphorus(*) Soluble biodegradable organic phosphorus Soluble non-degradable organic phosphorus (*)

    Those items marked with an asterisk (*) can normally be left at thedefault value of zero. If you are not modelling phosphorus removalthe remaining phosphorus terms can also be left at their defaultvalues.

  • Maths options

    The maths options are no longer displayed by selecting the [More]button when you create a new run. They are now accessible after therun has been created, by selecting Edit/Maths options.

  • The display of the maths options has been adjusted so that they arenow all displayed on one screen.

    When working with dialogues that cover more than one screen it isnow possible to keep track of where you are, as a page 1 of 4-stylelegend is added to the top of the dialogue.

    SSVI/SVI specification

    All the activated sludge-variant models now have a new dialogueoption that will allow you to enter the SSVI (metric) or SVI (US units)directly. With the metric choice of units there are three correlationsavailable based on SSVI. The WRc correlation is that printed in theSTOAT manual, while the two other correlations are taken fromSouth African studies and have been reprinted in the IAWQ

  • Technical Report on Settling Tank Design. The SVI correlation wasalso developed by the South Africans and is also printed in the IAWQTechnical Report.

    You do not have to use the correlations, as you still have the freedomto enter your own values for the parameters.

  • Tower Reactors

    The tower reactor was originally designed to be a basic shaft, ofuniform diameter along its length. It is now possible to specify a topstructure that is of different diameter, to better model the gasdisengagement zone.

    The disengagement zone is specified with the following:

    1. Disengagement zone depth. This depth is included when youspecify the total shaft depth.

    2. Disengagement zone cross-sectional area above the downcomer.Commonly the disengagement zone is a large tank divided by abaffle into two, with the section above the riser equipped with aweir for effluent outflow, and the baffle designed to prevent short-circuiting of liquid from the riser back into the downcomer. Thesetwo areas - around the riser and downcomer - are commonlyequally sized, but you can have them different sizes.

    3. Disengagement zone cross-sectional area above the riser.

    4. Disengagement zone hydraulic diameter above the downcomer.The hydraulic diameter is defined as 4 x wetted area / wettedperimeter.

    5. Disengagement zone hydraulic diameter above the riser.

    6. Number of disengagement zone stages above the downcomer.These stages are in the vertical plane, and are used as part of thecalculation of the gas transfer, especially in the riser section. Wesuggest that you leave these values at the default.

    7. Number of disengagement zone stages above the riser.

  • NEW PROCESS MODELSThe activated sludge models (activated sludge, oxidation ditch, SBR,CSBR, IDEA and tower reactor) have all had additional COD-basedmodels added.

    These models are

    IAWQ #2A: the IAWQ #2 model in STOAT considered onlyinorganic phosphorus. Model IAWQ #2A includes organicphosphorus, but modelled through the P:COD ratios in thestoichiometry menu. Organic phosphorus values specified in theinfluent data file, or calculated as outputs from any other process,are ignored.

    IAWQ #2B: this is substantially the same as IAWQ #2A, but hereorganic phosphorus is taken from the values entered in thesewage profile.

    IAWQ #2C: this is substantially the same as IAWQ #2A, butorganic nitrogen is also calculated through the values specified bythe N:COD ratios in the stoichiometry menu. Organic phosphorusand nitrogen values specified in the influent data file, or calculatedas outputs from any other process, are ignored.

    IAWQ #2D: this is substantially the same as IAWQ #2C, and isthe STOAT implementation of the recently-published IAWQ model#2d. The difference between this model and the previous IAWQmodel #2 is the inclusion of support for the PAOs to denitrify(hence the d in the IAWQ #2d). The IAWQ are recommendingthat this model be used as the replacement for the previous modelIAWQ #2.

    IAWQ #3: this is a recently-published model from the IAWQactivated sludge modelling task force, The task force arerecommending that this model be used to replace the previousmodel #1. There is not currently much experience with the model.The model differs from the IAWQ #1 in the following respects:

  • The effect of alkalinity on reaction rates is explicitlyincluded

    Organic nitrogen is calculated through N:COD ratios

    Total suspended solids (MLSS) are part of the modeldeterminands

    COD must be stored by the bacteria before beingoxidised, rather than being oxidised directly

    Under aerobic conditions biomass is lost thoughendogenous respiration, rather than through cellbreakdown leaking COD that is subsequently utilised forfresh bacterial growth

  • BATCH RUNSBatch runs can now be warm-started from previous batch runs.When you have more than one run for a given works you can chooseto start any run from the end conditions of any of the runs that tookplace earlier in the batch.

  • ADDITIONAL TOOLS

    Zoom

    By selecting Window/Zoom you can choose to zoom in on theflowsheet (make the images larger), zoom out (fit more images in theviewable area of the screen), use Best fit (STOAT will calculate azoom factor so as to get the entire flowsheet into the viewable area)or Normal view (reset the zoom factor to the default value).

    Windows calculator

    The Windows calculator can now be launched from within STOAT.When a run is open use Tools/Calculator. Note that the Windowscalculator must have been installed on the PC for this option to work.

    Integrated catchment simulator

    WRc and DHI are co-operating on the development of an integratedcatchment simulator (ICS), linking the DHI models MOUSE(sewerage modelling) and MIKE (river modelling) with STOAT. Thiswork is in progress, and its use will require that you have at least twoof these three programs, plus the ICS itself. As part of the ICS youneed to create a STOAT simulation and then a communication file.

  • This communication file is created from the open run by selectingTools/Create PFS file.

    STOAT defaults file

    In previous releases of STOAT the defaults that STOAT used werekept in a file called STOAT.INI, located in your Windows directory.We have now moved this file, so that it will be placed in the samedirectory as your STOAT programs. This will make it easier to havedifferent versions of STOAT, for example when upgrading in future.More information about the STOAT.INI file can be found in the userguide.

    Help About information

    Selecting Help/About will now display a new About screen, shownbelow.

    Selecting System Info will provide you with more information aboutyour PC.