Abstract
Anaerobic fermentation of pig waste produced 6·–14·6 g l −1 volatile fatty acids (VFA) for four days at 30°C when pig waste contained 5·3–14·3% w/w solids. Schizosaccharomyces sp. HL assimilated all the VFA up to 9·3 g l −1 in the surface culture using the supernatant from anaerobically fermented pig waste as medium when pH was adjusted to the lowest value permitting growth of the yeast. The lowest pH permitting the yeast growth rose as VFA concentration increased and at this pH, the yield was maximum. The maximum yield of dry matter was 5·8 g l −1 on the supernatant with 9·3 g l −1 VFA and pH 5·1. Microbiological and chemical analyses of Schiz. sp. HL biomass grown on the supernatant suggested that the organism might be acceptable as a fodder yeast.
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