Summary
An Upflow Sludge Blanket-(USB)-reactor and an USB-Fixed Film-(UBFF)-combination were operated simultaneously, running as pH-auxostats with a synthetic wastewater containing acetic acid as the only carbon source. In the UBFF-reactor accelerated growth of the sludge blanket volume could be observed in addition to fast surface biofilm development and a granular bacterial sludge of high density. Hydraulic retention times (HRT) of 2.3 h, and gasproductivities of 100 v/v.d were achieved in the UBFF-reactor, compared to 3.5 h and 70 v/v.d respectively in the USB-reactor. At maximum loading rates the acetic acid conversion efficiency exeeded values of 90% in both reactors.
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Fiebig, R., Dellweg, H. Comparison between the process performance of an UASB-reactor and an UASB-fixed film-combination with an acetic acid enrichment culture. Biotechnol Lett 7, 487–492 (1985). https://doi.org/10.1007/BF01199864
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DOI: https://doi.org/10.1007/BF01199864