Venturi aeration and thermophilic aerobic sewage sludge digestion in small-scale reactors |
| |
Authors: | Peter Burt Michel H Littlewood Simon F Morgan Brian N Dancer John C Fry |
| |
Institution: | (1) School of Pure and Applied Biology, University of Wales College of Cardiff, PO Box 915, CF1 3TL Cardiff, UK;(2) Electricity Council Research Centre, CF1 3TL Capenhurst, Chester, UK |
| |
Abstract: | Summary The aeration performance of two venturi aeration reactors (operating volumes 381 and 251) was studied for an air-water system. It was found that the mass transfer coefficient (k
la) could be described in terms of the superficial gas velocity (V
s) alone by the simple expressionk
La=aV
infb
supS
with constantsa=0.313,b=0.579 for the 38-1 reactor anda=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 betweenk
La 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|