METHOD OF CONTROLLING CONCENTRATION OF CARBON DIOXIDE FOR CARBON DIOXIDE FIXING DEVICE USING CATBONATED WATER

摘要

PURPOSE: A dissolved carbon dioxide concentration controlling method for a carbon dioxide fixing apparatus using carbonated water is provided to more effectively prepare an optimal culturing condition for microalgae by controlling the concentration of carbon dioxide inside culture water, and reducing installation cost for the carbon dioxide fixing apparatus by using a pH meter or an oxygen meter instead of an expensive carbon dioxide meter. CONSTITUTION: A dissolved carbon dioxide concentration controlling method for a carbon dioxide fixing apparatus includes: a step of manufacturing carbonated water by dissolving carbon dioxide in water using a carbonated water maker; a step of culturing microalgae inside a collecting water tank using the carbonated water fed from the carbonated water maker as culture water; and a step of feeding the carbonated water from a carbon dioxide reducing apparatus collecting the carbon dioxide to inside the collecting water tank with the carbon assimilation of the microalgae. The optimal pH value of the culture water for increasing the microalgae inside the collecting water tank is determined(ST11). The pH value of the culture water inside the collecting water tank is measured(ST12). The supply amount of the carbon dioxide dissolved in the carbonated water is varied according to the variation of the measured pH value on the basis of the determined optimal pH value so that the concentration of the dissolved carbon dioxide is controlled(ST13). [Reference numerals] (ST11) Setting the optimal pH value; (ST12) Measuring the pH value of culture water; (ST13) Controlling the carbon dioxide concentration of carbonated water;