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Definition: This calculator determines the influent Biochemical Oxygen Demand (BOD) based on the rate at which microorganisms consume organic matter in a wastewater treatment system.
Purpose: It helps wastewater treatment professionals estimate the organic load entering a treatment system based on substrate utilization parameters.
The calculator uses the formula:
Where:
Explanation: The formula calculates the organic load entering the system based on microbial consumption rates and system parameters.
Details: Accurate influent BOD estimation is crucial for designing and operating wastewater treatment plants, ensuring proper treatment capacity and efficiency.
Tips: Enter the specific substrate utilization rate, tank volume, MLSS concentration, sewage discharge rate, and effluent BOD. All values must be > 0 (except effluent BOD which can be 0).
Q1: What is typical specific substrate utilization rate?
A: Rates typically range from 0.1 to 1.0 per day depending on wastewater characteristics and microbial population.
Q2: How do I determine mixed liquor suspended solids?
A: MLSS is measured through laboratory analysis of samples from the aeration tank.
Q3: Why include effluent BOD in the calculation?
A: Effluent BOD accounts for the organic matter that remains untreated in the system.
Q4: What units should I use for sewage discharge?
A: Use consistent units (m³/day) for all volume/time measurements in the calculation.
Q5: How accurate is this calculation?
A: It provides a theoretical estimate; actual values may vary based on system conditions and wastewater characteristics.