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 urvpatel@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
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