FRESH WATER GENERATION SYSTEM AND FRESH WATER GENERATION METHOD

摘要

Provided is, in a fresh water generation system, a bactericide dosing method for suppressing growth of biofouling by mixing waters to be treated having different water qualities from each other in order to reduce the amount of energy required to generate fresh water. The present invention relates to a fresh water generation system and a fresh water generation method for obtaining fresh water from water to be treated A1 and dilution water B1 having different osmotic pressures from each other as raw waters, using desalination technique.

主权项

1. A fresh water generation system comprising:
a first bactericide dosing unit configured to obtain water to be treated A2 by dosing a bactericide into water to be treated A1; a second bactericide dosing unit configured to obtain dilution water B2 by dosing a bactericide into dilution water B1 having a salt concentration lower than a salt concentration of the water to be treated A1 and having at least one of an organic concentration higher than an organic concentration of the water to be treated A1 and a nutrient salt concentration higher than a nutrient salt concentration of the water to be treated A1; a mixing unit configured to obtain mixed water by mixing the water to be treated A2 with the dilution water B2; a third bactericide dosing unit configured to dose a bactericide in an amount represented by the following Expression (1) or (2) into the mixed water:
(XA+XB)≦XM  (1) in which XA, XB and XM each represents an amount of the bactericide as follows: XA: an amount of the bactericide dosed into the water to be treated A1; XB: an amount of the bactericide dosed into the dilution water B1; and XM: an amount of the bactericide dosed into the mixed water,
(CA×FA+CB×FB)/(FA+FB)