Home
Back
Population Equivalent Formula:
| From: | To: |
Population Equivalent refers to the total strength of wastewater for estimating the treatment required for municipal sewage treatment plant. It represents the equivalent population that would produce the same organic loading as the industrial wastewater being treated.
The calculator uses the Population Equivalent formula:
Where:
Explanation: The formula calculates the equivalent population by comparing the biochemical oxygen demand of industrial sewage to that of domestic sewage.
Details: Calculating population equivalent is crucial for designing appropriate sewage treatment facilities, determining treatment capacity requirements, and ensuring proper sizing of municipal sewage treatment plants to handle industrial wastewater loads.
Tips: Enter BOD of industrial sewage and BOD of domestic sewage in kg/m³. Both values must be valid and greater than zero.
Q1: What is the purpose of calculating population equivalent?
A: Population equivalent helps in designing sewage treatment plants by converting industrial wastewater loads into equivalent population units for proper sizing and capacity planning.
Q2: How is BOD measured for this calculation?
A: BOD (Biochemical Oxygen Demand) is typically measured through laboratory testing where the oxygen consumption by microorganisms is measured over a 5-day period at 20°C.
Q3: What are typical BOD values for domestic sewage?
A: Typical BOD values for domestic sewage range from 100-400 mg/L (0.1-0.4 kg/m³), with average values around 200-250 mg/L.
Q4: Can this calculation be used for multiple industries?
A: Yes, the population equivalent can be calculated for individual industries or summed for multiple industries to determine the total industrial load on a treatment plant.
Q5: Are there limitations to this approach?
A: This approach primarily considers organic loading. Other factors like toxic substances, temperature variations, and flow rates should also be considered in comprehensive treatment plant design.