Publisher: Bachudo Science Co. Ltd

Biodegradation of Urea Formaldehyde Modified Saw-Dust By Cellulolytic Fungi I

B. T. Nwufo, B. O. Oghenah
KEYWORDS: BIODEGRADATION, UREA-FORMALDEHYDE, SAW-DUST, CELLULOLYTIC FUNGI

ABSTRACT:

1.0: 0.75, 1.0: 1.0 and 1.0 : 1,5 mole ratios of urea formaldehyde have been employed for the modification of saw-dust. Degradation of these modified saw-dust samples was carried out using three strains of cellulolytic fungi, Phoma sp, Curvularia sp and Trichoderma viride as well as their mixed cultures, in order to assess their effectiveness as well as their competitive ability over incubation period of 60 days. Results show that sample of at both unmodified and the urea formaldehyde (UF) modified saw-dust were degraded by the various fungi as well as their mixed cultures to varying degrees as was evident from increases in weight loss, carbon loss and nitrogen content with incubation time. This degradation was more pronounced with the UF modified saw-dust than the unmodified pure saw-dust. Whereas Curvularia sp showed the highest loss values (7.32 g) at 1.0 : 0.75 UF mole ratio modification, the mixed culture exhibited the highest loss in% carbon (56.13%), with Trichoderma showing the highest % nitrogen (13.26%) content with same mole ratio as compared to other mole ratios employed. Generally, there was a steady decrease in C : N .ratio with increasing incubation period for both the unmodified and modified SRW-dust and for all the fungi species used.


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