WASTEWATER TREATMENT PROCESS DESIGN CALCULATOR | NO 3
Pressure Sand Filter & Activated Carbon Filter
Calculator
(Note – all Yellow are user defined value, all white are fixed values, all green are calculated value, all orange is calculated not to be shown)
Instructions
Enter values highlighted in the Yellow
Green highlights are the results
In case of any invalid result of non-functioning of the calculator, please write to us at design@swaenviro.com. We will try and help you with your sizing and calculation
INPUT
| Parameter | Value | Unit | Remarks |
|---|---|---|---|
| Flowrate | KLD | ||
| Working hours | hours | 2 hours for backwash | |
| Flowrate | 4.55 | cum/hr | |
| Recirculated flow | % | Typical 3% | Range from 2-5% | May be higher based on wastewater | |
| Recirculated flowrate | 0.23 | cum/hr | |
| Design flowrate (average) | 4.77 | cum/hr | Average + Recirculated |
| 0.0013258 | cum/s | ||
| Peak factor | As per CPHEEO | ||
| Final design flowrate | 4.77 | cum/hr | |
| Design Calculations | |||
| Cross Sectional Velocity | m/hr | Range from 5-15 m/hr ; 8 is typical, higher the cross section velocity lower the filter diameter but higher pressure drop and feed pressure requirement, For 8 m/s feed pressure will range from 15-20 meter while for >10 m/s the feed pressure required will be 20-25 meter | |
| Area Required | 0.48 | sqm | |
| Diameter | 0.780 | m | If diameter >2 m then provide multiple pressure vessels in series, due to economy and practial handling simplicity |
| Diameter | 30.70 | inch | |
| Free Board | 0.5 | m | |
| Depth of sand media | 1 | m | |
| Depth of gravel media | 0.5 | m | |
| Total depth | 2 | m | |
| Volume | 0.95 | cum | |
| 955 | liter | ||
| Filter Fill | 75 | % | |
| Bulk desnity of filter media | 1.68 | kg/l | |
| Media required | 1203 | kg | |
| Sand required | 842 | kg | 70% sand |
| Gravel required | 361 | kg | 30% gravel |
| Summary | |||
| Diameter | 0.780 | m | |
| Height | 2 | m | |
| Filter sand required | 842 | kg | D10 size 0.9 mm and Uniformity Coefficient 1.3-1.5 |
| Gravel required | 361 | kg | Variable from as per table below |
| Thickness of gravel | |||
| Grading 2.5 to 5 mm | 0.100 | m | |
| Grading 5 to 10 mm | 0.100 | m | |
| Grading 10 to 20 mm | 0.100 | m | |
| Grading 20 to 50 mm | 0.200 | m | |