Abstract
Summary. The aeration performance of two venturi aeration reactors (operating volumes 38 1 and 25 1) was studied for an air-water system. It was found that the mass transfer coefficient (k~.a) could be described in terms of the superficial gas velocity (Vs) alone by the. simple expression kLa=aVVs with constants a=0.313, b=0.579 for the 38-1 reactor and a =0.214, b=0.534 for the 25-1 reactor. A similar relationship was obeyed when the 38-1 reactor was aerated with a diffuser tile (a= 17.0, b= 1.52). A linear relationship between kLa and gas hold-up was observed for the 38-1 reactor with both venturi and diffuser aeration. The 25-1 reactor was used successfully for the thermophilic aerobic digestion of sewage sludge. A mean sludge temperature rise of 30°C was observed. Chemical oxygen demand, pH, and total solids content of the digested sludge differed significantly from the feed sludge and were similar to values obtained for full-scale thermophilic aerobic digestion. No significant differences between inorganic solids content, dissolved oxygen concentration, or redox potential were observed between feed and digested sludge.
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