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Thermophilic high-rate anaerobic treatment of wastewater containing long-chain fatty acids: effect of washed out biomass recirculation

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Abstract

Biomass washed out from an expanded granular sludge bed (EGSB) reactor treating oleate (82%, w/w) was inves-tigated. This biomass had a 50% higher activity compared to granules present in the EGSB reactor. Recirculationof washed out biomass into reactor remarkably improved the treatment performance. The highest methane conversion rate from oleate, 300 mg CH4-COD/g VSS.d, was achieved at a concentration of 4 g oleate-COD/l and a volumetric loading rate of 8 g COD/l.d.

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Hwu, CS., van Beek, B., van Lier, J. et al. Thermophilic high-rate anaerobic treatment of wastewater containing long-chain fatty acids: effect of washed out biomass recirculation. Biotechnology Letters 19, 453–456 (1997). https://doi.org/10.1023/A:1018396111127

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