Calculate total oxygen demand, air flow requirements, and blower sizing for biological wastewater treatment systems. Accounts for BOD removal, nitrification, alpha factor, and diffuser efficiency.
Enter your process parameters below to calculate design values. All calculations follow industry-standard methodologies.
Several correction factors affect real-world oxygen transfer: Alpha (α) = process water vs clean water transfer ratio (0.4-0.8 for wastewater); Beta (β) = saturation concentration ratio (0.95 typical); Temperature = warmer water holds less DO; Fouling = diffuser clogging reduces efficiency over time. Fine bubble diffusers (disc, tube, or panel) achieve 25-35% SOTE while coarse bubble achieves 10-15%.
When nitrification is required to meet ammonia discharge limits, additional oxygen is needed. The stoichiometric requirement is approximately 4.6 kg O₂ per kg NH₃-N oxidised. This typically adds 30-50% to total oxygen demand. For designs requiring both nitrification and denitrification, consider an anoxic zone to recover approximately 2.9 kg O₂ per kg NO₃-N denitrified.
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