Sludge activity, rate of consumption

The aerobic sludge activity, i.e. metabolic processes with consumption of oxygen, are usually stated in mg O2/g oTS min. The sludge activity largely depends on the average sludge load and the current substrate supply during the measurement. The typical range of activity is 0.05 to about 0.2 mg O2/g oTS min.

With the parameter sludge activity, the entire metabolic processes are combined, i.e. both the carbon degradation and the nitrification. If one wishes to separate these two essential parameters, it is possible to add ATH (allylthiourea) before the measurement, whereby the nitrogen oxidation is suppressed.

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