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Aeration Blower Design Calculator

Professional wastewater treatment blower sizing - from biology to final selection

1
Process Design
→
2
Oxygen Demand
→
3
System Design
→
4
Final Selection
🏭
Step 1: Process Design Parameters

Flow & Loads

Number of people equivalent
Malaysia typical: 225 L/PE/day
Calculated Average Daily Flow:
ADF: 1125 m³/day (1.125 MLD)
Default: 250 (municipal sewage 200–300). Note: COD ≈ 2 × BOD. If COD only, divide by 2.
Default: 40 (domestic 30–50)
Default: 0.6 (range 0.5–0.7)
Default: 1.1 (accounts for load variations, VFD handles the rest)
MSIG Standard A: 92% removal required (250 → 20 mg/L)
Click "Calculate Process Requirements" to see biological design
💨
Step 2: Oxygen Demand Calculation

Environmental Conditions

Field vs clean water transfer efficiency
Saturation concentration ratio

Diffuser Configuration

📊 Selected Diffuser Specifications
Air Flow Range: 1 – 7 Nm³/h per diffuser
Recommended Flow: 2.5 – 5 Nm³/h per diffuser
Design Flow (used): 4 Nm³/h per diffuser
Typical OTE: 2.0 – 3.0 %/m depth
Pressure Drop (clean): 3 – 5 kPa
Within recommended range ✓
Fine: 2-3%/m, Coarse: 1-1.5%/m
For diffuser density check (L × W of aeration tank)
Click "Calculate Air Requirements" to see oxygen transfer analysis
⚡
Step 3: Blower System Design

🔧 Air Piping Design

Sum of all drop pipes to diffusers

Fittings (Equivalent Length Method)

📊 System Pressure Requirements

Calculated from diffuser depth (depth × 9.81)
Auto-filled from diffuser selection
Typically 3-5 kPa for membrane
From piping design calculation
Inlet filter + silencer
Additional margin on total pressure
Pressure Summary (click Calculate to update)
Submergence + Diffuser + Fouling + Piping + Filter = Total

⚙️ Blower Configuration

Overall efficiency (typically 60-75%)
Click "Design Blower System" to see blower specifications
📋
Step 4: Final Blower Selection Summary
Complete previous steps to see final recommendations