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Focuses on a titrimetric method for monitoring toxicity in suspended biomass in order to measure the activity of nitrifying biofilms and to determine the effect of several toxic compounds on the biofilm. Details of study with respect to toxicity of tannery compounds on biofilms; Results suggesting an acceptable repeatability of the method for all the toxicants tested; Comparison of biofilm systems resistance to the toxicants, when the results obtained using suspended nitrifying biomass, with those found in the literature.

Evaluates the operation of a lab-scale biofilm airlift suspension (BAS) reactor that is aerated cyclically and nonaerated for nitrogen removal. Obtaining of nitrifying biofilm growth and denitrifying suspended growth by maintaining a sufficiently long anoxic hydraulic retention tie; Development of a compact reactor for the treatment of concentrated wastewaters containing ammonia.