Design of arsenic removal plant by coagulation, sedimentation

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Rural community in the South <strong>of</strong> Calcutta (India) � GROUNWATER QUALITY • Arsenic: 100 mg/L • Turbidity: about 0 NTU • Microbiological: good quality � DATA • 1200 inhabitants • D = 20 L/inh/d • Sodium hypochlorite and Alum (aluminum sulfate, Al 2(SO 4) 3 • 14H 20) availability CONTEXT DESIGN OF ARSENIC REMOVAL PLANT BY OXIDATION, COAGULATION, SEDIMENTATION AND FILTRATION Q = 1200 inh x 20 L/inh/d = 24,000 L/d = 24 m 3 /d � > 90% → As OUT = 10% * 100 mg/L = 10 mg/L 8
CONTEXT Rural community in the South <strong>of</strong> Calcutta (India) � CHEMICALS • Oxidants: sodium hypochlorite, NaClO • Coagulant: Alum (aluminum sulfate), Al 2(SO 4) 3 • 14H 20 9
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: WATER USES • Human uses: drinking
Page 11 and 12: DESIGN OF FLOCCULATION TANK FLOCCUL
Page 13 and 14: • Hydraulic loading rate: R h = 6
Page 15: PLANT EXAMPLE

Design of arsenic removal plant by coagulation, sedimentation

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