Design of arsenic removal plant by coagulation, sedimentation

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DESIGN OF SEDIMENTATION TANK • T sed = 2-3 h • V sed = Q x T sed = 24 m 3 /d x 2 h = 24/24 m 3 /h x 2 h = 2.0 m 3 • Hydraulic loading rate: R h = 0.8 – 1.5 m/h • Ased = Q/R h = 24/24 m 3 /h / 0.8 m/h = 1.25 m 2 • fsed = (4 x Ased/∏) 0,5 = 1.3 m • Hsed = Vsed/Ased = 1.6 m
• Hydraulic loading rate: R h = 6 – 7 m/h • H = 1 – 2 m • H sf = 1 m FILTER BACKWASHING • R h = 15 – 30 m 3 /(m 2 x h) • Tc = 5 – 10 min DESIGN OF SAND FILTRATION • A sf = Q/ R h = 24/24 m 3 /h / 7 m/h = 0.17 m 2 • f sf = (4 x A sf/∏) 0,5 = 0.46 m = 46 cm • Q = R h x A sf = 20 m/h x 0,14 m 2 = 2.8 m 3 /h • V = Q x Tc = 2.8 m 3 /h x 5 min = 2.8 m 3 /h x 5/60 h = 0.23 m 3 Backwashing frequency: from 1 time/d to 1 time/week (in relation with water quality and quantity)
Page 1 and 2: CeTAmb Università degli Studi di B
Page 3 and 4: ARSENIC REMOVAL PROCESSES • Arsen
Page 5 and 6: • 10 villages • 20,000 inhabita
Page 7 and 8: WATER USES • Human uses: drinking
Page 9 and 10: CONTEXT Rural community in the Sout
Page 11: DESIGN OF FLOCCULATION TANK FLOCCUL
Page 15: PLANT EXAMPLE

Design of arsenic removal plant by coagulation, sedimentation

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