© FRACair FRAC TANK MAGNETIC AERATION AND MIXING SYSTEM DESIGN CRITERIA ➡︎

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FRACair DESIGN CRITERIA➜

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AIR REQUIREMENTS

Air requirements for 20,000 gal frac tanks are a function of the type of wastewater, wastewater properties, desired treatment process, aeration/mixing cfm, bubble size, and retention time for aeration or mixing. The required airflow depends on diffuser type, tank depth, wastewater density, viscosity, temperature, salinity, solids type, and desired treatment goal. Five-inch membrane diffusers with fine, medium, or coarse bubble sizes are used in our FRACair systems.  FRACair preliminary starting point design criteria can be estimated for larger or smaller tanks by using the following equation:

The cfm required for each application/20,000 gal tank x 1,000 = cfm/1,000 galons of water.  Determine the number of thousands of gallons of wastewater in your tank and multiple by this value to determine the air required for your tank.

Note that each waste stream is different and pilot testing is recommended prior to full-scale design and field operation. Note that diffuser bubble size, depth of water, air contact time with the tank must be considered.  Recommendations presented herein must be confirmed by pilot and field testing.  

Examples:

Minimun Air Requirement for a 10,000 gal tank of domestic wastewater the cfm required for solids mixing is 30 to 50 cfm, therefore the amount of air required = 30/20,000 x 1000 = 1.5 cfm/1,000 gals, or for a 10,000 gal tank you need a minimum of 15 cfm of air.

Maximum cfm requirement for a 10,000 gal tank, the amount of air required is 50/20,000 x 1,000 = 2.5 cfm/1,000 gal you need a maximum of 25 cfm of air.

AIR SUPPLY SYSTEMS

Rotary Lobe and Two Stage Regenerative blowers generally operate at a maximum pressure of 5 psi. Standary 20,000 gal frac tanks, water levels are approximately 8 ft deep which requires a hydrostatic pressure of approximately 3.5 psi.  Blowers have pressure relief valves set at approximately 5 psi which provides enough pressure to clean disc diffusers when required.  Blower pressure relief valves need to be set to prevent damage to the blower.  CFM and pressures are specific to the type of matrix you are mixing or aerating.