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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DESIGN OF OXIDATION and<br />
COAGULATION TANKS<br />
OXIDANT DOSAGE: NaClO<br />
• T ox= 1-2 min • V ox = Q x T ox = 24 m 3 /d x 2 min =<br />
= 24 m 3 /(24 x 60 min) x 2 min = 0.033 m 3 =<br />
• Oxidation test<br />
Dosage = 1-2 mg/L<br />
• 15% solution<br />
= 33.3 L<br />
= 0.3 kg/d<br />
ALUM DOSAGE: Al2(SO4) 3 • 14H20 • Tc = 1-2 min<br />
• Jar test<br />
Dosage=10-50<br />
mg/L<br />
• 12% solution<br />
• D NaClO = 2 mg/L = 2 g/m 3<br />
• C NaClO = Q x D/0.15 = 24 m 3 /d x 2 mg/L/0.15 =<br />
= 24 m 3 /d x 2 g/m 3 /0.15 = 320 g/d =<br />
• Vc = Q x Tc = 24 m 3 /d x 2 min =<br />
= 24 m 3 /(24 x 60 min) x 2 min = 0.033 m 3 =<br />
= 33.3 L<br />
• D Alum = 30 mg/L = 30 g/m 3<br />
• C coag = Q x D/0.12 = 24 m 3 /d x 30 mg/L/0.12 =<br />
= 24 m 3 /d x 30 g/m 3 /0.12 = 6,000 g/d =<br />
= 6 kg/d
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