Biological Oxygen Demand Influent Calculator

Formula Used:

\[ BOD_i = \frac{FM \times V \times X}{Q} \]

Food to Microorganism Ratio (FM):

Volume of Tank (V):

m³

MLSS (X):

kg/m³

Sewage Flow (Q):

m³

Biological Oxygen Demand (BODi):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Biological Oxygen Demand Influent?

Biological Oxygen Demand (BODi) is applied to determine the aerobic destructibility of organic substances in wastewater treatment systems. It represents the amount of oxygen required by microorganisms to break down organic matter in the influent wastewater.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ BOD_i = \frac{FM \times V \times X}{Q} \]

Where:

\( FM \) — Food to Microorganism Ratio
\( V \) — Volume of Tank (m³)
\( X \) — MLSS concentration (kg/m³)
\( Q \) — Sewage Flow (m³)

Explanation: This formula calculates the biological oxygen demand based on the relationship between food supply, tank volume, mixed liquor suspended solids, and sewage flow rate.

3. Importance of BODi Calculation

Details: Accurate BODi calculation is crucial for designing and operating wastewater treatment plants, determining aeration requirements, and ensuring proper treatment efficiency for organic matter removal.

4. Using the Calculator

Tips: Enter Food to Microorganism Ratio, Volume of Tank in cubic meters, MLSS concentration in kg/m³, and Sewage Flow in cubic meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is Food to Microorganism Ratio?
A: Food to Microorganism Ratio is a measurement of the amount of incoming food divided by the pounds of microorganisms in the system.

Q2: What does MLSS represent?
A: MLSS (Mixed Liquor Suspended Solids) is the concentration of suspended solids in the mixed liquor within an aeration tank during the activated sludge process.

Q3: Why is BODi important in wastewater treatment?
A: BODi helps determine the organic loading on the treatment system and is essential for designing appropriate aeration and treatment processes.

Q4: What are typical BODi values?
A: Typical BODi values vary depending on the wastewater characteristics but generally range from 100-400 mg/L for domestic wastewater.

Q5: How often should BODi be calculated?
A: BODi should be calculated regularly as part of process control and monitoring in wastewater treatment plants, especially when flow rates or characteristics change.