Fast Granulation by Combining External Sludge Conditioning with FeCl₃ Addition and Reintroducing into an SBR.

In addition, granulation time decreased as the retention efficiency increased ( Figure 6 b), i.e., showing a negative trend (where granulation time = −13.541 × retention efficiency +26.409, R 2 = 0.9704).

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The MLSS and MLVSS/MLSS ratio in the SBR showed an increasing trend (3.75–5.88 g·L −1 and 0.5–0.82) in the first 10 days ( Figure 4 a).

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