Batch Operation

A slurry bioreactor is often designed as a standard continuously stirred tank reactor (CSTR) having a mechanical stirrer, baffles, and a sparger at the bottom (Fig. 11.5). In the system a three-phase suspension of contaminated solids, water, and air is maintained. Batch degradation experiments in aerated, stirred, slurry bioreactors have been carried out frequently.

Figure 11.6a shows the experimental results from a batch experiment on a 4-L scale. Using a conventional stirred bioreactor with baffles (stirrer speed 600 rpm, aeration rate 1.5-3 L min-1, temperature kept at 30 °C), adapted biomass and nutrients were added (ammonium, phosphate, and potassium) while the pH was kept at 7-8. The soil was an oil-contaminated sandy soil having an initial oil concentration

Fig. 11.6 Decontamination time course in (a) batch processing of soil (4 L), (b) batch processing of sediment (650 L).

Fig. 11.6 Decontamination time course in (a) batch processing of soil (4 L), (b) batch processing of sediment (650 L).

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