Abstract
The parameters required to calculate the concentration of variable bacteria in activated sludge can be determined by using two different respirometers, viz. the Sapormat for long-run batches and an open respirometer, described earlier, for short-run batches. Sludges with different sludge loads were found to contain widely different amounts of bacteria, varying from 8 to 60% of the dry weight. A temporarily higher sludge load on a low loaded system has little influence on the clarification because of the rapid increase of the viable bacteria concentration. A temporarily lower sludge load, however results in a decreased efficiency due to the decay of the viable biomass. On the basis of calculations it can be concluded that the effluent BOD merely consists of cell decay products.
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