{"id":7832,"date":"2020-06-23T16:39:05","date_gmt":"2020-06-23T14:39:05","guid":{"rendered":"http:\/\/www.hydrograv.com\/?page_id=7832"},"modified":"2022-07-07T09:42:28","modified_gmt":"2022-07-07T07:42:28","slug":"activated-sludge-tanks","status":"publish","type":"page","link":"https:\/\/www.hydrograv.com\/en\/services\/simulation\/activated-sludge-tanks\/","title":{"rendered":"Activated Sludge Tanks"},"content":{"rendered":"
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The Simulation of Activated Sludge Tanks<\/span><\/strong><\/span><\/p>\n

What are the benefits of hydrograv simulations?<\/span><\/strong><\/span><\/p>\n

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  • Reduced costs by saving energy and investment<\/li>\n
  • Optimization of biological processes<\/li>\n
  • Optimization of agitators (location, number, power input)<\/li>\n
  • Optimization of aeration by determination of the parameters SOTR, SSOTR or SOTE (e.g. according to the German design guidline DWA-M 209)<\/li>\n<\/ul>\n

    Example 1: Calibration and validation of the modelling approaches for activated sludge tanks
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    • Measurement of the 3D water velocities by using a high-resolution acoustic velocimeter<\/span><\/li>\n
    • Calibration and validation of the modelling approaches, e. g. turbulence modelling, bubble size<\/li>\n<\/ul>\n

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      Figure:<\/strong> Comparison of measured and simulated velocities in aerated and anoxic zones in an activated sludge tank.
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      Figure<\/strong>: Comparison of measured and simulated degree of improvment of the parameter SSOTR according the German design guideline DWA-M 209.
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      Example 2: Optimization of the aeration by simulating the parameter SSOTR-Werten according to the German design guideline DWA-M 209<\/strong><\/p>\n

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      • virtual oxygen input experiments incl. oxygen transfer by simulation<\/span><\/li>\n<\/ul>\n

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        Figure:\u00a0\u00a0 <\/strong>Concentration of oxygen on planes in different activated sludge tanks.
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        Example 3: Detection of depositions
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        • virtual oxygen input experiments incl. oxygen transfer by simulation<\/span><\/li>\n<\/ul>\n

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          Figure:<\/strong> Velocities close to the bottom in different zones of an aeration tank (left) and deterministic comparison of different variants by analysing areas with velocities lower than a critical velocity (right).
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          • analysis of concentrations of activated sludge close to the bottom<\/span><\/li>\n<\/ul>\n

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            Figure:<\/strong> Concentrations of activated sludge close to the bottom normed with the inflow concentration (left) and determinstic analysis of critical areas with regard to depositions (right).
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            Example 4: Determination of hydraulic retention time<\/span><\/strong><\/span><\/p>\n

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            • simulation und analysis of virtual tracers<\/li>\n
            • determination of the number of CSTRs (Continuous Stirred Tank Reactors) in series and further statistical parameters<\/li>\n<\/ul>\n

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              Figure:<\/strong> Exemplare measure for improving the hydraulic retention time to achive a plug flow.
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              .<\/span><\/p>\n<\/div><\/section><\/div><\/div><\/div><\/main><\/div><\/div>