| 摘要 |
PURPOSE:To contrive to miniaturize equipment and to reduce equipment cost, in a method for treating distilled water obtained by a brine desalting apparatus with a Ca- salt and CO2 obtained by decarbonation treatment of seawater, by using CO2 obtained by adding an acid to seawater in a divided form. CONSTITUTION:Seawater is mixed with a controlled amount of an acid supplied from an acid tank 3 through a regulation valve 4 and, thereafter, injected into a decarbonation apparatus 5 where contacted with the open air to be decarbonated while CO2 is exhausted along with air. The residual seawater accumulated to the bottom part of the apparatus 5 is sent to a degassing apparatus 12 but the pH thereof is detected in a pipe 11 and the opening degree of the valve 4, that is, the acid injection amount is regulated on the basis of the detection value to allow the residual seawater to retain an unreacted bicarbonate ion. This seawater receives the injection of the acid through a regulation valve 14 and, thereafter, injected into the apparatus 12 and degassed under vacuum while the pH thereof is detected to regulate the valve 14. pH adjusted seawater is treated in an evaporation type brine desalting apparatus 9 to be converted to distilled water which, in turn, enters a limestone bed 21. Gas such as O2 or N2 containing CO2 extracted by a steam ejector 22 from the apparatus 12 is separated from condensed water therein and, thereafter, introduced into distilled water in a pipe 20 under pressure through a compressor 24 and absorbed thereby.
|
