## Where to Find a Dissolved Air Flotation Design Calculations Spreadsheet

To obtain a *Dissolved Air Flotation Design Calculations *Spreadsheet, click here to visit our spreadsheet store. This Excel spreadsheet is intended for making DAF design calculations. **You can buy a convenient spreadsheet for making DAF design calculations for a very reasonable price.** It is available in either U.S. units or S.I. units. Read on for background information about* dissolved air flotation design calculations*.

## Background for Dissolved Air Flotation Design Calculations

Dissolved air flotation is an alternative to clarification for removal of fine suspended mater from a water or wastewater stream. It is especially good for fine suspended matter that doesn’t settle out well with regular clarification. The air-solids ratio, A/S, is typically calculated with the following equation:Where: sa is the air solubility, f is an efficiency factor, P is the recycle pressure, R is the recycle flow rate, Sa is the influent suspended solids concentration, and Q is the influent flow rate. The required DAF area can be calculated based on a design value for DAF hydraulic loading rate or based on a design value for DAF solids loading rate.

## Example Dissolved Air Flotation Design Calculations Spreadsheet

An example *dissolved air flotation design calculations spreadsheet *is partially shown in the image below. This Excel spreadsheet can be used to calculate A/S, the needed air to solids ratio, and the required DAF area based on user input information on influent design flow and characteristics. This Excel spreadsheet, as well as others for wastewater treatment process design calculations, is available in either U.S. or S.I. units for a very reasonable price in our spreadsheet store.

1. Metcalf & Eddy, Inc, (Revised by Tchobanoglous, G, Burton, F.L, Stensel, H.D.), *Wastewater Engineering, Treatment and Reuse*, 4th Ed., New York, NY, 2003.

2. Bengtson, Harlan, “DAF Design Calculations Spreadsheet,” an online blog article