EQUIPMENT AND METHOD FOR WATER CLEANING

摘要

PROBLEM TO BE SOLVED: To provide equipment for water cleaning, in which a return water to be returned from a Mn removal tank to a water arriving well is neutralized effectively, so that the amount of an oxidizer to be used in the water arriving well can be reduced.

SOLUTION: The equipment for water cleaning is provided with: the water arriving well 4 in which raw water for water cleaning is received; a precipitation basin 6 for precipitating suspended matter contained in the raw water and removing the precipitated suspended matter; a water treatment facility 8 for treating the supernatant water from the precipitation basin as required; a concentration tank 10 for concentrating sludge in the supernatant water separated in the precipitation basin 6; a dehydrator 14 for dehydrating the concentrated sludge separated in the concentration tank 10; the Mn removal tank 12 for removing a manganese component contained in the supernatant water in the concentration tank 10; and a return line 19 for returning the return water from the Mn removal tank 12 to the water arriving well 4. A neutralization tank 20 is arranged on the return line 19. Waste combustion gas from a gas engine or a gas turbine or the carbonated water produced by utilizing the waste combustion gas is supplied to the neutralization tank 20, so that the return water is neutralized by the supplied waste combustion gas or carbonated water in the neutralization tank 20.

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