Influent BOD Given Oxygen Demand And Ultimate BOD Both Calculator

Formula Used:

\[ Influent\ BOD = Effluent\ BOD + \frac{\left(\frac{5\ Days\ BOD}{Ultimate\ BOD}\right) \times \left(Theoretical\ Oxygen\ Requirement + (Oxygen\ Demand\ of\ Biomass \times Volume\ of\ Wasted\ Sludge\ per\ day \times MLSS\ in\ Returned\ or\ Wasted\ Sludge)\right)}{Sewage\ Discharge} \]

Effluent BOD given Oxygen Demand and Ultimate BOD:

kg/m³

5 Days BOD:

kg/m³

Ultimate BOD:

kg/m³

Theoretical Oxygen Requirement:

kg/s

Oxygen Demand of Biomass:

Volume of Wasted Sludge per day:

m³/s

MLSS in Returned or Wasted Sludge:

kg/m³

Sewage Discharge:

m³/s

Influent BOD:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Influent BOD Calculation?

The Influent BOD calculation determines the total amount of Biochemical Oxygen Demand present in incoming sewage, accounting for effluent BOD, oxygen requirements, and various wastewater treatment parameters.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

\( Effluent\ BOD \) — Effluent BOD given Oxygen Demand and Ultimate BOD (kg/m³)
\( 5\ Days\ BOD \) — 5 Days Biochemical Oxygen Demand (kg/m³)
\( Ultimate\ BOD \) — Ultimate Biochemical Oxygen Demand (kg/m³)
\( Theoretical\ Oxygen\ Requirement \) — Theoretical oxygen requirement (kg/s)
\( Oxygen\ Demand\ of\ Biomass \) — Oxygen demand of biomass
\( Volume\ of\ Wasted\ Sludge\ per\ day \) — Volume of wasted sludge per day (m³/s)
\( MLSS\ in\ Returned\ or\ Wasted\ Sludge \) — Mixed Liquor Suspended Solids in returned or wasted sludge (kg/m³)
\( Sewage\ Discharge \) — Sewage discharge rate (m³/s)

Explanation: This formula calculates the influent BOD by considering the relationship between various wastewater treatment parameters and their impact on oxygen demand.

3. Importance of Influent BOD Calculation

Details: Accurate influent BOD calculation is crucial for designing effective wastewater treatment systems, determining treatment efficiency, and ensuring compliance with environmental regulations for effluent quality.

4. Using the Calculator

Tips: Enter all required parameters with appropriate units. Ensure values are positive and within reasonable ranges for accurate calculations.

5. Frequently Asked Questions (FAQ)

Q1: Why is influent BOD important in wastewater treatment?
A: Influent BOD helps determine the organic loading on treatment plants and is essential for designing appropriate treatment processes and sizing treatment units.

Q2: What is the difference between 5-day BOD and ultimate BOD?
A: 5-day BOD measures oxygen consumption over 5 days, while ultimate BOD measures total oxygen required for complete decomposition of organic matter.

Q3: How does MLSS affect the calculation?
A: MLSS represents the concentration of microorganisms in the system, which affects the oxygen demand for biomass and overall treatment efficiency.

Q4: When should this calculation be used?
A: This calculation is particularly useful for wastewater treatment plant design, optimization, and performance evaluation studies.

Q5: Are there limitations to this equation?
A: The accuracy depends on proper measurement of all input parameters and assumes steady-state conditions in the treatment system.