Calculations
Activated sludge bioreactor
Input data
Sludge age
Biomass in reactor
Removed BOD load
Recirculation ratio
Endogenous respiration coefficient
Cell production coefficient
Output data
Concentration of suspended solids in reactor
Volume
Sludge production
Recycle concentration
Input data
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Description
The activated sludge bioreactor node provides a set of calculations for designing and analyzing systems involved in wastewater treatment using activated sludge. The primary functionalities include:
- Reactor Volume: Calculates the volume required for the bioreactor to ensure effective wastewater treatment.
- Biomass Concentration: Determines the concentration of microorganisms present in the reactor.
- Sludge Age: Estimates the time the sludge remains in the system (also known as mean cell residence time).
- Reactor Dimensions: Defines the dimensions for designing the reactor based on the calculated volume.
- Limiting Flow: Identifies the maximum influent flow rate that the bioreactor can handle.
- Surface Area: Calculates the surface area needed for aeration to support biological processes.
- Total Area: Determines the overall area required for setting up the bioreactor system.
Activated sludge bioreactor
Inputs
| Parameter | Units | Description |
|---|---|---|
| Sludge age | days (d) | The average age of the sludge in the system. |
| Biomass in reactor | kg/m³ | The concentration of biomass in the reactor. |
| Removed BOD load | mg/L | The concentration of removed biological oxygen demand (BOD). |
| Recirculation ratio | - | The ratio of recirculated sludge flow to influent flow. |
| Endogenous respiration coefficient | - | The coefficient for endogenous respiration in microorganisms. |
| Cell production coefficient | - | The coefficient that represents microbial growth rate. |
Outputs
| Parameter | Units | Description |
|---|---|---|
| Concentration of suspended solids in reactor | mg/L | The concentration of solids in the reactor. |
| Volume | m³ | The calculated volume of the bioreactor. |
| Sludge production | kg | The amount of sludge produced in the system. |
| Recycle concentration | mg/L | Concentration of recycled sludge. |
References
- VON SPERLING, Marcos. Princípios do tratamento biológico de águas residuárias: lodos ativados. 2. ed. Belo Horizonte: Desa, 2002. 4 v.