| 摘要 |
PURPOSE:To obtain drinking water having good quality, by guiding a part of prepared fresh water to the side of a limestone decomposition furnace to mix the same with formed quick lime and, thereafter, allowing the resulting mixing to absorb carbon dioxide while mixing the treated water with high purity carbon dioxide from the decomposition furnace and the remaining formed fresh water. CONSTITUTION:An externally heated limestone decomposition furnace 2 is provided in close vicinity to the installation place of the evaporation apparatus 1 of a fresh water making apparatus, for example, a seawater desalting apparatus and distilled water being fresh water formed from an evaporation 3 is introduced into a calcium dissolving apparatus 5 through a pipe 4, because contains only several ppm of TDS and unsuitable for drinking water, to impart hardness. That is, carbon dioxide generated by the decomposition of limestone in the heated decomposition tower 2' of the limestone decomposition furnace 2 keeps high purity and enters the calcium dissolving apparatus 5 to be dissolved in fresh water and CaCO3, H2O and CO2 are reacted in the dissolving apparatus 5 to form Ca(HCO3)2 in a dissolved state and hardness is imparted to fresh water.
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