Abstract
Uncentrifuged palm oil mill sludge (POS) diluted to about 50% (v/v in tap water) supports good mycelial growth of Myceliophthora thermophila and Trichoderma harzianum. Both of the selected fungi are non-toxic to mice. After 24 h M. thermophila grown in batch culture in POS yielded 28.6 g/l of mycelial biomass with biological oxygen demand (BOD) and chemical oxidation demand (COD) reductions of 72% and 74% respectively. T. harzianum yielded 24.4 g/l of mycelial biomass with BOD and COD reductions of 67% and 68% respectively. The crude protein of the mycelial biomass of M. thermophila and T. harzianum was twice that of untreated POS. T. harzianum showed amylolytic activity while M. thermophila was cellulolytic and lipolytic.
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