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Potable Water Biotechnology, Membrane Filtration and Biofiltration 513
Fig. 11.9. Observed and predicted DOC utilization, 5 m/h (2.0 gal/min·ft 2 ) loading rate (120).
Table 11.7
Summary of model predictions, pilot-scale, Cincinnati, OH, 1996 (120)
Filter Observed
effluent
DOC (mg/L)
95% confidence Predicted
Interval (mg/L) effluent
DOC (mg/L)
Absolute deviation
(mg/L)
Relative deviation
(%)
1 2.3 0.7 2.1 0.2 8.7
2 2.1 0.4 1.9 0.2 9.5
3 2.0 0.7 1.8 0.2 10
5 2.1 0.7 1.8 0.3 14
7 2.5 0.9 2.7 þ0.1 þ6.0
8 2.7 0.7 2.7 0.0 0.0
The applicability of the model would be enhanced if it could accurately predict substrate
utilization at the pilot-scale and in the presence or absence of ozonation and backwash
disinfection. In order to address these issues, the model was evaluated during the 5-month
pilot-scale study (132). Kinetic parameters were estimated for media acclimated with ozonated
and nonozonated water. All of the filters listed in Table 11.3 were sacrificed at the end
of the study in order to determine the biomass development with respect to filter depth. The
model predictions and deviations from observed values are summarized in Table 11.7. The
model predictions of effluent DOC were compared with the observed average effluent DOCs
during the last 4 weeks of the pilot plant study, when DOC removals and biomass levels were
at an approximate steady state. With one exception, model predictions fell within 10% of
observed effluent DOCs.