Start-Up Characteristics of a Granule-Based Anammox UASB Reactor Seeded with Anaerobic Granular Sludge

Figure 4

SEM observation of the sludge on day 0 (a, b), day 45 (c, d), and day 150 (e, f) of the start-up. The red square indicates the crack on the granular surface.

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(b)

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(e)

(f)