Seeking advice on pH issues in circulating water in sulfuric acid production

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In the company’s sulfuric acid production process, the SO2 gas is generated primarily during ore smelting in the smelting workshop. In the sulfuric acid production stage, soft water with a pH of around 7.4 is used for purification and recycling. Throughout the purification process, water is taken from gas cooling towers or purification cooling towers for pH testing, and the resulting pH value is around 9.3. No alkaline substances are added during this process, and the overall environment is acidic. Please analyze why the pH value keeps increasing ? ? ? Is it simply because the circulating water causes aeration in the cooling tower, leading to continuous release of CO2, which is why the pH level keeps rising? ? I would be extremely grateful if everyone could help me understand this. (Please provide a detailed explanation.)