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Anaerobic treatment of baker's yeast effluent using a hybrid digester with polyurethane as support material

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Summary

A high-strength baker's yeast effluent was anaerobically treated using a hybrid digester under mesophilic conditions. The digester was subjected to a substrate COD concentration of 21 767 mg/I at three different HRTs. At HRTs of 3.0, 2.0 and 1.0 d, the digester reduced the substrate COD by 76, 61 and 33%, respectively. Although the best COD removal was obtained at an OLR of 7.30 kg COD/m3.d, the highest COD removal rate (6.51 kg COD/M3-d) was found at 10.65 kg COD/m3.d at an HRT of 2.0 d. The low methane yield and VFA accumulation found in the digester effluent, indicated inhibition on methanogenic level and this was considered to be the rate-limiting step during the anaerobic treatment process. The overall efficiency of the digester indicated that this digester design and support medium was suitable for the treatment of a high-strength, sulfate-rich baker's yeast effluent.

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Authors and Affiliations

  1. Department of Microbiology, University Orange Free State, P.O. Box 339, 9300, Bloemfontein, South Africa

    T. J. Britz & M. Van Der Merwe

Authors
  1. T. J. Britz
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  2. M. Van Der Merwe
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Britz, T.J., Van Der Merwe, M. Anaerobic treatment of baker's yeast effluent using a hybrid digester with polyurethane as support material. Biotechnol Lett 15, 755–760 (1993). https://doi.org/10.1007/BF01080151

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