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An ASM1-based mathematical model was developed for the description of the combined activated sludge-biofilter system of the Southpest Wastewater Treatment Plant, Budapest, Hungary. This model includes the interactions of the activated sludge and biofilter units, i.e. the influence of both the clarified ac- tivated sludge e uent and the backwashed nitrifying and den- itrifying microorganisms. Concentration profile measurements have been carried out throughout the combined system in or- der to track the biological processes. Optimization possibilities of the existing combined plant were investigated by mathemati- cal simulations under the di erent detected operational condi- tions. In these studies concentration data measured on separate days and the appropriate flow rates of the preclarified influent and the recycled streams registered at the treatment plant were used. Simulation results showed that N-removal of the activated sludge unit could be highly intensified by appropriate aeration, that would facilitate the e cient growth of backwashed biomass. However, in some cases, shortage of readily biodegradable car- bon source proved to be the limit of the benefits available.

Enhancing activated sludge nitrification through seeding from a downstream nitrifying fixed-film reactor