What are the reasons for the decrease in the pH of the effluent?
Thread Content
Why is the pH of the influent water 7.5 while that of the effluent water is only 4.3? The A/O process is being used – what are the reasons for the decrease in the pH of the effluent water?
Although the pH of the incoming water is 7.5, acid-producing bacteria produce acid during the anaerobic stage, causing the pH value to drop; generally, in the anaerobic section, VAF…
If the pH decreases, there are several possible reasons: 1. Acidic substances or wastewater enter the biological treatment tank, causing the pH to drop； 2. Hydrolytic acidification occurs in the biochemical tank due to anaerobic conditions, resulting in a decrease in pH ； 3. High ammonia levels in the water, along with high aeration rates, long retention times in the biological tank, and low organic matter concentrations, accelerate the nitrification process, resulting in a decrease in pH. However, the pH does not drop below 6.5 under these conditions.