Abstract
Abstract The results of laboratory studies on the influence of selected discrete and flocculent suspended solids on the rate of oxygen transfer to aqueous suspensions in a model surface aeration system are presented. The suspension volume used in the investigation was 4·11 and the aeration system consisted of a surface impeller in an up-draft flow regime as shown in general outline on Fig. 1. The discrete suspensions (PVC powder, fine and coarse dried granular peat) were found to have no significant effect on the rate of oxygen transfer in the concentration range tested, i.e. 0–10 g 1 −1 . The influence of the flocculent suspensions used (two activated sludges and a synthetic suspension) was found to depend on the nature of the suspension and its concentration. The correlation of flocculent suspension concentration and its influence on the rate of oxygen transfer is presented as a second degree polynomial relationship.
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