What causes the increase in pH during hydrolytic acidification?
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Previously, when the water pH was 11, it could be reduced to around 6.5; but now, with the water pH set at around 5.5, it actually increases. Why is that?
Could you elaborate a bit more? That would help with the analysis as well
If measurement issues are ruled out, it could be: 1. The concentration of *ao acids and salts in the influent is high, resulting in denitrification reactions that cause a significant rise in pH； 2. The backflow volume increases and the concentration of *ao acids and salts in the backflow is high; denitrification occurs, causing the pH to rise significantly ； 3. High reflux pH leads to an increase in hydrolysis pH ； 4. Alkaline water enters.