Tag Archives: Sludge

[EN] WWTP/check: Checking Procedure for Biological Nutrient Removal Processes with evaluation of possible Energy/Cost Saving in pre-Denitrification/Nitrification scheme

WWTPWWTPcheck – Math Model 

Nitrogen Removal and Control Strategy in Continuous-Flow-Aeration 

WWTPcheck Model is based on typical Mathematical Models referring in the field (ASM 1/2/3, WPRC), but it supplemented with Performance Indicators (KPIs), which also provide information on the Residual Depurative Capacity. The predenitrification process was first developed and proposed by Ludzack and Ettinger (1962) and later modified by Barnard (1973), who completely separated the anoxic and aerobic reactors, recycling the settler underflow to the anoxic reactor, and providing an additional recycle from the aerobic to the anoxic reactor, see Figure below:


WWTPcheck Flow scheme:  Modified Ludzack-Ettinger process (Denitro/Nitro)

Main Functionalities of Evaluation of WWTPcheck  procedure:

  • Percentage of Performance of Biological Nutrient Removal Process.
  • Min/Max values of Dissolved Oxygen required to avoid process problems (bulking, etc.).
  • Characterization of Functional Parameters of the Aeration System.
  • Percentage of possible Energy Saving in the Aeration System (variable DO setpoint calculation on the base of min/max biological need…).
  • Energy required for Aeration System.
  • Percentage of Electrical Energy Cost Saving.
  • Percentage of Sludge/Waste produced and their Cost.
  • Customized Input/Output Reporting.

The WWTP/check procedure is  available in MS-Excel file (.xls or .xlsx – MS Office-Excel 2007 or compatibles) to be better used as a checking tool and test.


For info or for a quote: