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. 2022 Mar 21;10:851565. doi: 10.3389/fbioe.2022.851565

TABLE 2.

Operational parameters for phase I to V.

Phases Time (d) DO (mg L−1) HRT(h) Inf. pH Inf. NH4-N
I (precultivation and starvation) 1–18 >6
II (ammonia oxidation rate) 19–33 0.70 ± 0.30 6 8.3 ± 0.1 60 ± 3 mg L−1
III (pH) 34–43 0.70 ± 0.30 4 8.3 ± 0.1 40 ± 3 mg L−1
44–55 0.70 ± 0.30 4 7.5 ± 0.1 40 ± 3 mg L−1
56–66 0.70 ± 0.30 4 6.8 ± 0.1 40 ± 3 mg L−1
67–83 0.70 ± 0.30 4 7.5 ± 0.1 40 ± 3 mg L−1
IV (NH4-N) 84–89 0.70 ± 0.30 4 7.5 ± 0.1 40 ± 3 mg L−1
90–111 0.70 ± 0.30 2 7.5 ± 0.1 20 ± 3 mg L−1
112–115 0.70 ± 0.30 4 7.5 ± 0.1 40 ± 3 mg L−1
V (DO) 116–151 1.70 ± 0.30 2.6 7.5 ± 0.1 40 ± 3 mg L−1