Design of arsenic removal plant by coagulation, sedimentation
Design of arsenic removal plant by coagulation, sedimentation
Design of arsenic removal plant by coagulation, sedimentation
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• Hydraulic loading<br />
rate: R h = 6 – 7 m/h<br />
• H = 1 – 2 m • H sf = 1 m<br />
FILTER BACKWASHING<br />
• R h = 15 – 30 m 3 /(m 2 x h)<br />
• Tc = 5 – 10 min<br />
DESIGN OF<br />
SAND FILTRATION<br />
• A sf = Q/ R h = 24/24 m 3 /h / 7 m/h = 0.17 m 2<br />
• f sf = (4 x A sf/∏) 0,5 = 0.46 m = 46 cm<br />
• Q = R h x A sf = 20 m/h x 0,14 m 2 = 2.8 m 3 /h<br />
• V = Q x Tc = 2.8 m 3 /h x 5 min = 2.8 m 3 /h x<br />
5/60 h = 0.23 m 3<br />
Backwashing frequency: from 1 time/d to 1 time/week (in relation with water<br />
quality and quantity)
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