biomass activity

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Biomass activity can be measured in a number of different ways:

  • by monitoring its growth curve; however, only growth phases 2 and 3 can be approximated using the turbidity measurement and even then, only on a pure culture;
  • by measuring the activity of the various "universal" enzymes;

In fact, the following methods are of more value for monitoring the biological process:

  • measuring the gas (O2) consumed or produced (CO2, CH4); these are termed respirometric measurements and are far more representative. Please refer to treatability tests for a description of one of the measurements used;
  • measuring the rate at which the substrate disappears and comparing it with the amount of biomass used;

e.g. gCOD · g–1 VS · h–1 // gNH4 · g–1 VS · h–1