# Population Equivalent Calculator

Our Population Equivalent Calculator is an easy-to-use online tool designed to calculate the Population Equivalent (PE) of waste water. This value represents the amount of organic biodegradable load that enters a waste water treatment plant and it is expressed in terms of the number of individuals that would contribute the same amount of load.

## How to Use

To use our Population Equivalent Calculator, you need to enter the daily waste water amount in cubic meters, the BOD5 concentration in waste water in milligrams per liter, and the COD concentration in waste water in milligrams per liter. After entering these values, click on the 'Calculate' button to get the Population Equivalent (PE).

## Where it is Used

The Population Equivalent (PE) is widely used in the design and operation of waste water treatment plants. It is also used to calculate the fees for the discharge of industrial waste water into municipal sewage systems and to assess the environmental impact of waste water discharges.

## Formula

The formula for calculating the Population Equivalent (PE) is as follows:

**PE = (Daily Waste Water Amount * BOD5 Concentration in Waste Water / 60) + (Daily Waste Water Amount * COD Concentration in Waste Water / 120)**

This formula takes into account the daily waste water amount, the BOD5 concentration, and the COD concentration in the waste water.

## Things to Note

The Population Equivalent (PE) is not a measure of the actual number of individuals served by a waste water treatment plant. Instead, it is a measure of the organic biodegradable load entering the plant. Therefore, the calculated PE might be higher than the actual number of individuals served by the plant if there are significant industrial or commercial waste water contributions.

## Frequently Asked Questions

##### How do I use the Population Equivalent Calculator?

Enter the daily waste water amount in cubic meters, the BOD5 concentration in waste water in milligrams per liter, and the COD concentration in waste water in milligrams per liter. Then click 'Calculate'.

##### What is the formula for the Population Equivalent Calculation?

The formula is PE = (Daily Waste Water Amount * BOD5 Concentration in Waste Water / 60) + (Daily Waste Water Amount * COD Concentration in Waste Water / 120).

##### Where is the Population Equivalent (PE) used?

The PE is used in the design and operation of waste water treatment plants, to calculate discharge fees, and to assess environmental impact of waste water discharges.

##### Does the Population Equivalent represent the actual number of individuals served by a waste water treatment plant?

No, the PE is a measure of the organic biodegradable load entering the plant, not the actual number of individuals.

##### Can the calculated Population Equivalent be higher than the actual number of individuals served by the plant?

Yes, if there are significant industrial or commercial waste water contributions, the calculated PE might be higher than the actual number of individuals served by the plant.