Recently, the treatment efficiency of total phosphorus in the effluent has not been satisfactory
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I work with the AO process for treating beer wastewater, using biological phosphorus removal; the total phosphorus level in the effluent has always been within normal ranges – it’s around 9 in the influent and about 2 in the effluent. Recently, however, this value in the effluent has risen to over 4, and it won’t go down. Sludge discharge is taking place as usual, and the concentration of pollutants in the influent hasn’t changed much; it’s just that the pH is slightly higher, around 9. Could it be that the high temperatures in summer, along with the increased pH, are causing a decrease in the removal efficiency? Or is it that the water volume increases during the peak season, resulting in insufficient aerobic retention time? I would appreciate it if the teachers could help analyze this and suggest ways to solve it. Thank you
Too high pH and water temperature, along with insufficient DO, result in poor biological phosphorus removal efficiency
The pH value is controlled at too high a level. In the phosphorus removal process, the pH value is generally kept between 6.5 and 8.0; a too high pH value can inhibit the activity of polyphosphate-accumulating bacteria. Moreover, controlling the sludge age is important for phosphorus removal – an excessively long sludge age is detrimental to phosphorus removal as it causes the absorbed phosphorus to be released back into the water. While ensuring effective BOD removal, the shorter the sludge age, the better