The secret behind it are so-called macroflocs, which form immanently in the system and, due to their size, create an internal gradient with respect to aerobic and anoxic/anaerobic environments.
Another positive effect of the macroflocs is an above-average biological phosphorus removal and very low sludge volume indices.
The suspended substances in the effluent also reach values below 5 mg/l on average. This means that even in plants with very strict phosphorus effluent values no further post-treatment is necessary.
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