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Yield and protein quality of thermophilic Bacillus spp. biomass related to thermophilic aerobic digestion of agricultural wastes for animal feed supplementation

Ugwuanyi, J.O. (2008) Yield and protein quality of thermophilic Bacillus spp. biomass related to thermophilic aerobic digestion of agricultural wastes for animal feed supplementation. Bioresource Technology, 99 (8). pp. 3279-3290. ISSN 0960-8524

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Abstract

Bacillus spp. responsible for thermophilic aerobic digestion (TAD) of agricultural wastes were studied for their growth rate, yield and protein quality (amino acid profile) under conditions that approximate full-scale waste digestion as pointers to the capacity of TAD to achieve protein enrichment of wastes for reuse in animal feeding. Specific growth rates of the thermophiles varied with temperature and aeration rates. For Bacillus coagulans, the highest specific growth rate was 1.98 lh1; for Bacillus licheniformis 2.56 lh1 and for Bacillus stearothermophilus 2.63 lh1. Molar yield of B. stearothermophilus on glucose increased with temperature to a peak of 0.404 g g1 at 50 C before declining. Peak concentration of overflow metabolite (acetate) increased from 10 mmol at 45 C to 34 mmol at 65 C before declining. Accumulation of biomass in all three isolates decreased with increase in temperature while protein content of biomass increased. Highest biomass protein (79%) was obtained in B. stearothermophilus at 70 C. Content of most essential amino acids of the biomass improved with temperature. Amino acid profile of the biomass was comparable to or superior to the FAO standard for SCP intended for use in animal feeding. Culture condition (waste digestion condition) may be manipulated to optimize protein yield and quality of waste digested by TAD for recycling in animal feed.

Item type: Article
ID code: 19755
Keywords: thermophilic Bacillus spp., thermophilic aerobic digestion (TAD), biomass yield, protein quality, agricultural waste enrichment, Pharmacy and materia medica, Microbiology, Bioengineering, Environmental Engineering, Waste Management and Disposal
Subjects: Medicine > Pharmacy and materia medica
Science > Microbiology
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 27 May 2010 20:50
    Last modified: 05 Sep 2014 02:19
    URI: http://strathprints.strath.ac.uk/id/eprint/19755

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