So F/M changes were examined. Within 72 h treatment, COD decreased by 83%, 90%, 80% and 74% for F/M of 40, 20, 10 and 2 respectively, but the COD limit still existed (Fig. 2). Therefore, high initial COD was not the cause of the COD reduction limit. The second possibility was loss of metabolic activity of PSB after long retention time.
Therefore, new Z08 mass was added into bioreactor after 72 h to boot up metabolic activity. However, reduction limit still existed (data were not shown).
So F/M changes were examined. Within 72 h treatment, COD decreased by 83%, 90%, 80% and 74% for F/M of 40, 20, 10 and 2 respectively, but the COD limit still existed (Fig. 2). Therefore, high initial COD was not the cause of the COD reduction limit. The second possibility was loss of metabolic activity of PSB after long retention time.Therefore, new Z08 mass was added into bioreactor after 72 h to boot up metabolic activity. However, reduction limit still existed (data were not shown).
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