Biomass Evaluation of Fungi Pellets by Respiratory Activity.

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  • Biomass Evaluation of Fungi Pellets by

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A theoretical discussion on the biomass evaluation of pellet based on the respiratory activity was made and its experimental investigations were carried out using pellets formed by Aspergillus niger, of which average diameters were 2.0mm, 5.0mm and 10.0mm, respectively. The maximum respiration rate (Rr) was recognized when the initial TOC concentration exceeded about 5, 000mg/l. The biomass concentration is linearly related to the Rr value in case of the same pellet diameter. However, the Rr value decreased as the pellet diameter became larger in case of the same biomass concentration, because of the oxygen limitation. Comparing the theory based on the oxygen limitation with the experimental results, it was suggested that the area in 0.5-0.7mm from the pellet surface was an aerobic and active area not susceptible to the oxygen limitation. It was shown by the proposed theory that the maximum respiration rate was effective as an index of biomass evaluation of pellets, which were formed by the five-day culture and of which diameter was more than 5.0mm.

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