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.
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Hydro-Flo Technologies, Inc. |
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The Art and Science...
of Wastewater Treatment |
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For more detailed information go to
www.HydroFloTech.com |
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Available
DAF Model #'s |
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Company |
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5 |
281 |
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Location |
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8 |
300 |
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11 |
320 |
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This spreadsheet will calculate a DAF unit based on ppm of
TSS & FOG combined, Flow rate and acceptable A/S ratio: |
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15 |
340 |
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20 |
361 |
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25 |
383 |
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Input |
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31 |
405 |
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What is the combined TSS & FOG ppm content of wastewater: |
3000 |
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38 |
428 |
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What is the process flow rate (gpm): |
250 |
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45 |
451 |
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Lbs/Sq. Ft./Hr (1.5 Typical) |
1.5 |
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53 |
475 |
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Recycle System Pressure (in gage pressure, psi, typically 65
psig) |
80 |
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61 |
500 |
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Recycle System Efficency (Typically 80.00%) |
80% |
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70 |
527 |
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Temperature (in Farenheit) |
60 |
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80 |
592 |
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Selected DAF model number based on minimum required DAF unit
(below) and round up to the next larger DAF model |
263 |
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90 |
661 |
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101 |
735 |
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113 |
815 |
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Call 630-762-0380 to talk to a Hydro-Flo application
engineer |
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125 |
900 |
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138 |
1,088 |
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Output |
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151 |
1,191 |
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lb/gal of TSS = |
0.03 |
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165 |
1,301 |
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Solids Loading ratio of TSS per min (lb); |
6.26 |
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180 |
1,416 |
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Solids Loading ratio of TSS per hour (lb): |
375.50 |
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195 |
1,539 |
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Solids Loading ratio of TSS per day (24 hr period): |
9012.10 |
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211 |
1,668 |
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Saturation Concentration (lb air/gal H2O) at atmospheric
pressure |
0.0002190 |
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228 |
1,805 |
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Theoretical Air Release (lb air/gal H2O) |
0.0009098 |
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245 |
1,945 |
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Minimum required Sq. Ft. in DAF Unit (Separation Chamber): |
250.34 |
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263 |
2,150 |
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gpm/sq.ft. hydraulic loading rate for Selected DAF Alone |
0.95 |
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Recirculation (RAD) Flow Rate Range |
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Theoretical Low End Recycle (RAD) Flow Rate (gpm): |
125.00 |
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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 |
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Low end gpm/sq.ft. hydraulic loading rate for selected
DAFand theoretical RAD combined (gpm/sq.ft.): |
1.4259 |
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Theoretical High End Recycle (RAD) Flow Rate (gpm): |
275.17 |
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High end gpm/sq.ft. hydraulic loading rate for the selected
DAFand theoretical RAD combined (gpm/sq.ft.): |
1.9968 |
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CRITERIA: You must apply the following
when sizing a DAF |
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Standard Solids Loading Rate: 1.5 lb/sq. ft./hr |
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Never use more than 4 gpm/sq.ft hydraulic loading rate for
the DAF and RAD combined |
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Acceptable Lbs Air/Lbs Solids range = 0.015 - 0.040 |
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We typically apply 100% of the low end RAD flow rate when
BELOW - 3000 ppm |
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We typically apply 75% of the high end RAD flow rate when
BETWEEN 3000 - 5000 ppm |
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We typically apply 100% of the high end RAD flow rate when
ABOVE - 5000 ppm |
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Formulas: |
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Recirculation Flow Rate: |
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(Lbs Air/Lbs Solids) x (Solids Loading Rate/min) x
Theoretical Air Release |
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Dimensions for (Solids Loading Rate/min): Lbs/min |
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Dimensions for Theoretical Air Release: 1000 gal/0.62 lbs.
@ 75 psig and 68 degrees F |
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Low end (Lbs Air/Lbs Solids) = 0.015 |
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High end (Lbs Air/Lbs Solids) = 0.040 |
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Conversion Factors: |
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1,000 mg = 1 gr |
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453.59 gr = 1 lb. |
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3.785 l = 1 gal. |
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