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Table 4 Cha rac teristics of water treatment utility in the lower catchment part of the Guapi-Macacu watershed in 2011

From: Priority areas for watershed service conservation in the Guapi-Macacu region of Rio de Janeiro, Atlantic Forest, Brazil

Treatment unit: Laranjal - CEDAE Municipality: São Gonçalo
Captivation area from the GMW 1,263 km2
Forest cover in the watershed 48.8%
Treatment type Conventional
General treatment phases Captivation, sedimentation, coagulation, flocculation, decantation, filtration, disinfection, water fluoridation and pH correction
Treated water flow Average flow in 2011, 5.35 m3 s-1
Population supplied with treated water 2,000,000 inhabitants
General chemical products used Aluminium sulphate Al2(SO4)3, polyelectrolyte, hexafluorosilicic acid H2SIF6, chlorine, calcium oxide CaO
Costs with chemical products for the treatment of raw water 2.31 × 106 BRL (year 2011)
Turbidity of raw water, average values 17.10 NTU
Treated water characteristics Colour, 2.50 uH
Turbidity, 0.34 NTU
Total costs with chemical products and electricity in a year for the water treatment unit For the treatment of 6 m3 s-1,
• 300,000 [BRL] (monthly expenditure for chemical products)
• 100,000 [BRL] (monthly expenditure for electricity in the captivation and production area within the unit)