How to address the high pH value in the purified water after acidic water stripping?
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The purified water coming out of the bottom of the acidic water stripping tower has a pH value of around 9.8, which is higher than that of the raw water (with a pH of around 9.6). Could everyone please help analyze why this is the case? Purified water analysis: sulfides around 5 mg/l, ammonia nitrogen around 10 mg/l. COD is about 800 mg/L. I want to conduct a compositional analysis of purified water; what parameters are best to analyze?
Was alkali added to the raw water? Otherwise, the pH value wouldn’t reach 9.6. The pH value of our raw water is between 7 and 8, while that of the purified water is around 9. The ammonia nitrogen level is approximately 40, and the sulfide content is less than 1
What effects will adding alkali to the raw water have? At present, the operation of the stripping tower in my unit is normal as well, but the ammonia nitrogen, sulfides, and pH level in the purified water are all high; I’m not sure what the reason for this is
You can analyze the ion forms in the purified water; an increase in ions such as sulfate ions may be responsible for the rise in ammonia nitrogen levels, and high ammonia nitrogen levels in turn lead to an increase in the pH value. We also need to check the steam ratio used in your tower; if the amount of steam is low, it will cause the three values you mentioned to increase!