DAF Design & Sizing information

DAF Filter Sizing Spreadsheet

Below is link to a DAF sizing spreadsheet developed by HydroFlo Tech.

By inputting the major design criteria, you can solve for overall DAF sizing based on fluctuating solids loading.

The spreadsheet operates on Microsoft Excel 2003 or later.

Below is a sample shot of the spreadsheet.

HydroFlo Tech, LLC.
^{The Art and Science...}^{of Wastewater Treatment}
For more detailed information go to www.HydroFloTech.com		Available DAF Model #'s
	Company	5	281
	Location	8	300
		11	320
This spreadsheet will calculate a DAF unit based on ppm of TSS & FOG combined, Flow rate and acceptable A/S ratio:		15	340
		20	361
		25	383
	Input	31	405
What is the combined TSS & FOG ppm content of wastewater:	3000	38	428
What is the process flow rate (gpm):	250	45	451
Lbs/Sq. Ft./Hr (1.5 Typical)	1.5	53	475
Recycle System Pressure (in gage pressure, psi, typically 65 psig)	80	61	500
Recycle System Efficency (Typically 80.00%)	80%	70	527
Temperature (in Farenheit)	60	80	592
Selected DAF model number based on minimum required DAF unit (below) and round up to the next larger DAF model	263	90	661
		101	735
		113	815
Call 630-762-0380 to talk to a HydroFlo application engineer		125	900
		138	1,088
	Output	151	1,191
lb/gal of TSS =	0.03	165	1,301
Solids Loading ratio of TSS per min (lb);	6.26	180	1,416
Solids Loading ratio of TSS per hour (lb):	375.50	195	1,539
Solids Loading ratio of TSS per day (24 hr period):	9012.10	211	1,668
Saturation Concentration (lb air/gal H2O) at atmospheric pressure	0.0002190	228	1,805
Theoretical Air Release (lb air/gal H2O)	0.0009098	245	1,945
Minimum required Sq. Ft. in DAF Unit (Separation Chamber):	250.34	263	2,150
gpm/sq.ft. hydraulic loading rate for Selected DAF Alone	0.95

Recirculation (RAD) Flow Rate Range
Theoretical Low End Recycle (RAD) Flow Rate (gpm):	125.00	Listed at the left are the theoretical RAD flow rates. If these numbers are above 4, increase the selected DAF model # until the output (at the desired recycle rate) is less than or equal to 4
Low end gpm/sq.ft. hydraulic loading rate for selected DAFand theoretical RAD combined (gpm/sq.ft.):	1.4259


Theoretical High End Recycle (RAD) Flow Rate (gpm):	275.17
High end gpm/sq.ft. hydraulic loading rate for the selected DAFand theoretical RAD combined (gpm/sq.ft.):	1.9968






CRITERIA: You must apply the following when sizing a DAF
Standard Solids Loading Rate: 1.5 lb/sq. ft./hr
Never use more than 4 gpm/sq.ft hydraulic loading rate for the DAF and RAD combined
Acceptable Lbs Air/Lbs Solids range = 0.015 - 0.040
We typically apply 100% of the low end RAD flow rate when BELOW - 3000 ppm
We typically apply 75% of the high end RAD flow rate when BETWEEN 3000 - 5000 ppm
We typically apply 100% of the high end RAD flow rate when ABOVE - 5000 ppm

Formulas:
Recirculation Flow Rate:
(Lbs Air/Lbs Solids) x (Solids Loading Rate/min) x Theoretical Air Release
Dimensions for (Solids Loading Rate/min): Lbs/min
Dimensions for Theoretical Air Release: 1000 gal/0.62 lbs. @ 75 psig and 68 degrees F
Low end (Lbs Air/Lbs Solids) = 0.015
High end (Lbs Air/Lbs Solids) = 0.040

Conversion Factors:
1,000 mg = 1 gr
453.59 gr = 1 lb.
3.785 l = 1 gal.

DAF Filter Sizing Spreadsheet

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