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Screening of Important Variables of Organic Acids Degradation by Phanerochaete chrysosporium Using Plackett-Burman Design in Refractory Arsenic-Bearing and Carbonaceous Gold Ores

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Abstract:

In this study, the important variables of organic acids degradation with Phanerochaete chrysosporium were selected in refractory arsenic-bearing and carbonaceous gold ores. The eight variables of fungal degradation of carbonaceous matter were confirmed by the previous single factor experiments, which were guaiacol concentration, dextrin concentration, tween-80 concentration, oxalic acid concentration, hydrogen peroxide concentration, pulp density, fungal concentration and action time. The most important factors influencing organic acids degradation (p < 0.05), as identified by a two-level Plackett-Burman design with above-mentioned eight variables, were pulp density, oxalic acid concentration and action time. The pulp density could influence the effective contact area between organic acids and fungi, the shear stress and the mass transfer efficiency of degradation system. Oxalic acid could affect the fungal growth and the enzymes activity by adjusting pH value of degradation system. Organic acids could not be fully degraded when the fungal action time was the very short or excessively long. A long action time could lead to the lack of nutrients and the accumulation of toxic and harmful substances.

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Periodical:

Solid State Phenomena (Volume 262)

Pages:

126-130

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.262.126

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Online since:

August 2017

Authors:

Qian Liu, Hong Ying Yang*, Lin Lin Tong, Jing Peng

Keywords:

Important Variables, Organic Acids, Phanerochaete chrysosporium, Plackett-Burman Design, Refractory Arsenic-Bearing Gold Ores, Refractory Carbonaceous Gold Ores, Screening

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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