title: The fate of soluble, recalcitrant, and adsorbing compounds in activated sludge plants. II.
abstract: An inhomogeneous first-order differential equation allows description of the time-dependent concentration change of an adsorbing compound in an activated sludge plant. Besides those parameters formerly considered, i.e., adsorption constant and surplus sludge wastage rate, the difference in dry matter content of the wasted sludge and that remaining in the activated sludge stage are now taken into account as well. This facilitates a more exact calculation of the elimination. The essential advantage of the new model lies in its simpler and faster applicability. The equations are steady and can be integrated facilitating, e.g., the calculation of the mean retention time of the absorbed material in the activated sludge stage. Other mechanisms such as biodegradation, precipitation, flocculation, and stripping are, as in our older model, not taken into account.
mesh_terms: D000327:Adsorption; D008433:Mathematics; D008954:Models, Biological; D012722:Sewage
chemical_list: D012722:Sewage