ETP Design Calculator
Preliminary sizing for industrial effluent treatment plants. Calculate aeration tank volume, hydraulic retention time, and sludge generation for textile, food, pharmaceutical, and other industries.
Free · Extended Aeration BasisETP Design Parameters
Sizing based on Extended Aeration activated sludge process (F/M = 0.05, MLSS = 3000 mg/L). Select industry to auto-fill typical values.
Typical values pre-filled for Food & Beverage. Adjust based on actual lab analysis.
How to Use This Calculator
- 1Select your industry type — typical inlet BOD and COD values will be pre-filled. You can override these with actual lab data.
- 2Enter the wastewater flow rate in KLD (kilolitres per day) — this is your daily average effluent generation.
- 3Adjust inlet BOD and COD values if you have actual lab analysis results. Click "Calculate ETP Size" for results.
Design Basis & Formulas
# Extended Aeration Activated Sludge Process
BOD Load (kg/d) = Flow (KLD) × BOD_in (mg/L) ÷ 1000
Aeration Volume (m³) = BOD Load ÷ (F/M × MLSS)
# Where: F/M = 0.05 kg BOD/kg MLSS/d; MLSS = 3000 mg/L
HRT (hrs) = Aeration Volume ÷ Flow × 24
Sludge (kg/d) = BOD Removed × 0.6 (yield factor)
CPCB Discharge Standards
| Parameter | Inland Surface Water | Land for Irrigation |
|---|---|---|
| BOD (mg/L) | ≤ 30 | ≤ 100 |
| COD (mg/L) | ≤ 250 | — |
| TSS (mg/L) | ≤ 100 | ≤ 200 |
| pH | 5.5 – 9.0 | 5.5 – 9.0 |
Source: CPCB General Standards for Discharge (Schedule VI, EPA 1986)
Need a Detailed ETP Design?
This tool provides preliminary estimates. Spans Envirotech offers complete ETP design, engineering, procurement, and construction services for industries across India.