Principal risks in designing wastewater treatment facilities. Calculation of aeration tanks (part 1) (for the discussion)

Summary

A detailed calculation of the values of the aerobic age of activated sludge is presented to ensure the required quality of the effluent, both in terms of ammonium nitrogen and nitrite nitrogen, with examples. Similar indicators have been calculated, for the most part, by the Danilovich–Epov empirical method, and on the basis of the calculations it is shown why the Danilovich–Epov method gives underestimated values of the sludge aerobic age. It is shown that calculations of the aeration tank volumes in our country have always (since 1974) been based on the formulas of enzymatic kinetics and, hence, have been theoretical (mathematical) models. Most process engineers in our country have always calculated and still are calculating biological wastewater treatment facilities using the formulas of enzymatic kinetics; therewith, this approach is always the next step compared to empirical models.

Key words

nitrification , sludge age , removal of nitrogen and phosphorus from wastewater , calculation of aeration tanks , ASM model