Anaerobic downflow stationary fixed film reactors operated at 35°C successfully treated synthetic (sucrose based) wastewater of different concentrations at high organic loading rates and short hydraulic retention times. Based on observed relations between washout solids retention time, hydraulic retention time and loading rate, an empirical model of the process was formulated. Incorporation of the washout factor into accepted theory allowed good prediction of chemical oxygen demand removal efficiency and reactor biomass concentration.

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