Robert Freudenberg

• Master of Science
• Research Director at Stamford Scientific International, Inc.

Pilot-scale integrated fixed-film activated sludge (IFAS) and non-IFAS control systems were compared, with respect to overall performance and functional behaviors and microbial population composition in the attached and suspended phases. The suspended phases of the control and IFAS systems exhibited similar rates of ammonia consumption; the attache...

Integrated fixed film activated sludge (IFAS) is an increasingly popular modification of conventional activated sludge, consisting of the addition of solid media to bioreactors to create hybrid attached/suspended growth systems. While the benefits of this technology for improvement of nitrification and other functions are well-demonstrated, little...

The potential benefits of integrated fixed film activated sludge (IFAS) with respect to protecting against chemical inhibitors of nitrification were evaluated in a pilot-scale study. Parallel IFAS and non-IFAS (Control) trains in A2O configurations were fed primary effluent from a full scale system. Chemical inhibition was evaluated in batch tests...

A pilot integrated fixed film activated sludge (IFAS) system and a parallel non-IFAS control were operated for treatment of domestic wastewater primary effluent. They were analyzed for differences in the characteristics of the four biomass phases present (Control suspended, IFAS suspended, and IFAS attached phases in two sequential aerobic reactors...

A pilot integrated fixed film activated sludge (IFAS) system and a parallel non-IFAS control were operated to compare their removal efficiencies of trace organic chemicals, including endocrine disrupting chemicals (EDCs) and estrogenic activity as determined by the yeast estrogen screen (YES) assay. Measurements of concentration profiles of EDCs in...