Aerobic Sludge Granulation in a Full-Scale Sequencing Batch Reactor
Table 2
Comparison of sludges in A/O, OD, and full-scale SBRs.
Process
Anaerobic/oxic
Oxidation ditch
Full-scale SBR
Volumetric flow rate (m3 d−1)
10,000
50,000
50,000
Operating mode
Plug flow (A/O)
Continuous flow
Sequencing batch
Substrate change
Feast-famine
Completely mixed
Feast-famine
COD loading (kg m3 d−1)
0.54
0.68
0.56
Ammonium loading (kg m3 d−1)
0.025
0.031
0.022
Settling time (min)
150
150
70–80*
MLSS (mg L−1)
5471
5818
3946
SVI30 (mL g−1)
61.1
60.7
47.1
MLVSS/MLSS
56.3%
57.2%
62.4%
Settling velocity (m h−1)
10.4
9.2
42.0
EPS (PS, mg/g VSS) (PN, mg/g VSS)
13.0 263.9
15.2 288.2
20.8 253.8
COD removal efficacy (%)
82.2
81.3
85.0
-N removal efficacy (%)
94.3
94.8
95.8
TN removal efficacy (%)
25.3%
22.7%
59.6%
Settling time in full-scale SBR includes 30 min of effluent withdraw.
*Samples from anaerobic/oxic reactor, oxidation ditch, and full scale sequencing batch reactor were taken at the same time on September 8, 2011.
