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Anaerobic digestion of deproteinated cheese whey in an Upflow Sludge Blanket reactor

Published online by Cambridge University Press:  01 June 2009

Emilige W. Schröder  and
Johannes De Haast
Emilige W. Schröder
Affiliation:
Department of Dairy Science, University of the Orange Free State, PO Box 339, Bloemfontein 9300, South Africa
Johannes De Haast
Affiliation:
Department of Dairy Science, University of the Orange Free State, PO Box 339, Bloemfontein 9300, South Africa
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Summary

Two l·9 1 Upflow Anaerobic Sludge Blanket (USAB) reactors, operated at 35 °C, were used for the digestion of deproteinated cheese whey substrate. The C/N ratio was 19, and the alkalinity requirements of the two reactors were satisfied by adding Ca(OH)2 and Na2CO3 in two different ratios respectively. Gas and effluent parameters indicated that reactor 1 (receiving a higher level of calcium) was superior and eventually a loading rate of 7·1 kg COD m−3 d−1 could be obtained in this reactor, compared to a loading rate of 5 kg COD m−3 d−1 which was obtained in reactor 2. Pellets with good settling abilities formed in reactor 1, while the sludge in reactor 2 developed a granular slimy appearance and settled poorly. Investigation of the ultrastructure of the sludge particles revealed a difference in the types of bacteria present in the granules.

Type
Original Articles
Information
Journal of Dairy Research , Volume 56 , Issue 1 , February 1989 , pp. 129 - 139
Copyright
Copyright © Proprietors of Journal of Dairy Research 1989

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