Effects of sponge size and type on the performance of an up-flow sponge bioreactor in primary treated sewage effluent treatment

Publisher:
Elsevier Ltd
Publication Type:
Journal Article
Citation:
Bioresource Technology, 2010, 101 (5), pp. 1416 - 1420
Issue Date:
2010-01
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The effects of polyurethane sponge size and type on the performance of an up-flow sponge bioreactor were studied using different sponge cube sizes (1 Ã 1 Ã 1 cm, 2 Ã 2 Ã 2 cm and 3 Ã 3 Ã 3 cm) and types of sponge (S28-30/45R, S28-30/60R, S28-30/80R and S28-30/90R). The reactors were operated under anaerobic conditions in an early stage and an aerobic condition in a latter stage. The results indicate that there was no significant difference in the organic and nutrient removal rates between sponge types. The medium size sponge (2 Ã 2 Ã 2 cm) had the best performance in terms of both biomass growth and pollutants removal. Under anaerobic condition, the COD, TN and TP removal efficiencies were up to 70%, 45% and 55%, respectively, and significantly improved under aerobic conditions (e.g. >90% TOC, 95% COD, 65% TN and 90% TP). The external biomass grew faster under anaerobic conditions while internal biomass was dominant under aerobic condition.
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