Beschreibung:
Increased interest in trickling filter application in the eighties has led to a need for more complete process design information for cases where simultaneous nitrification and BOD removal is practiced. Data from two pilot studies provided a basis for rationalizing process design relationships. Total organic loading per unit surface area is a more rational design basis than organic loading per unit volume, but it does not fully account for the differences in media types. Because of competition between heterotrophic bacteria and nitrifiers, nitrification is not initiated in the tower until soluble ${\rm BOD}_{5}$ concentrations in the liquid film are reduced to 20 mg/L or less.