The relationship between viability and respiration rate in the activated sludge process
1977; Elsevier BV; Volume: 11; Issue: 7 Linguagem: Inglês
10.1016/0043-1354(77)90168-3
ISSN1879-2448
Autores Tópico(s)Membrane Separation Technologies
ResumoThe possibility that non-viable bacteria could be responsible for a proportion of the activity of an activated sludge, was discussed by Jones (1973). Following this, the work reported here was undertaken to observe the relationship between the respiratory activity and the unit viability of activated sludges cultured at various net growth rates. Both viable counts and respiration rates increased to maximum values at a growth rate of 0.1 days−1. However, it was found that the apparent respiration rate per viable cell was not constant, as reported by Weddle and Jenkins (1971), but that it increased at low growth rates. At a growth rate of 0.1 days−1 the observed activity was six times that expected from the observed viability. The results are explained by attributing part of the activity to non-viable bacteria.
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