Oxygen Transfer Design

Aeration Design

Calculate oxygen transfer, diffuser selection, and blower sizing for wastewater treatment systems.

SOTR/AOTR

Conversion

Diffuser Types

3 Types

Energy Analysis

kWh/kg O2

Cost Estimate

CAPEX/OPEX

💨Aeration System Design

Design diffuser system, blower sizing, and oxygen transfer calculations.

Quick Power Estimate

Power
8.2 kW
Daily Energy
196 kWh
Specific Energy
0.196 kWh/m³

Design Parameters

Tank Parameters

Valid range: 1 to 100,000 m³
Valid range: 0.5 to 10 m
Valid range: 500 to 10,000 mg/L

Oxygen Demand

Valid range: 0 to 100,000 kg/day
Valid range: 0 to 50,000 kg/day
Valid range: 1 to 3

Conditions

Valid range: 0 to 45 °C
Valid range: 0 to 5,000 m above sea level
Valid range: 0.5 to 8 mg/L

Oxygen Transfer Correction Factors

Wastewater/clean water (0.4-0.9)
Salinity factor (0.95-0.99)
Membrane fouling (0.65-0.9)

Diffuser Types Comparison

Fine Bubble

SOTE:25-35%
Alpha:0.4-0.8
Applications:

Activated sludge, deep tanks

Pros:

  • High efficiency
  • Low energy
  • Good for deep tanks

Coarse Bubble

SOTE:10-15%
Alpha:0.6-0.9
Applications:

Mixing, equalization, pre-treatment

Pros:

  • Low fouling
  • Simple maintenance
  • Good mixing

Mechanical Surface

SOTE:1.2-2.4 kg O2/kWh
Alpha:0.8-0.95
Applications:

Oxidation ditches, lagoons

Pros:

  • No diffuser fouling
  • Good for shallow basins

Key Design Factors

Alpha (α)

Wastewater correction factor

Typical:0.4-0.8 for domestic wastewater
αSOTE = OTE in wastewater / OTE in clean water

Beta (β)

Salinity correction factor

Typical:0.95-0.99 for domestic wastewater
Cs* = β × Cs (standard)

Theta (θ)

Temperature correction factor

Typical:1.024 standard value
KLa(T) = KLa(20) × θ^(T-20)

Fouling Factor (F)

Diffuser performance decline

Typical:0.65-0.90 over time
Actual SOTE = Design SOTE × F

Key Formulas

Oxygen Requirement

AOR = Q × (So - S) / (1000 × f)
+ 4.57 × Q × (TKNo - TKN) / 1000
- 2.86 × Q × (NOx) / 1000

SOTR from AOTR

SOTR = AOTR × (Cs,20 / (β × Cs,T - CL))
× (1 / α) × (1 / θ^(T-20))

Continue Your Workflow

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Wastewater Treatment

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Process Models

ASM1/ASM2d/ADM1 simulation