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KMID : 0380020210360020171
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Korean Journal of Biotechnology and Bioengineering
2021 Volume.36 No. 2 p.171 ~ p.179
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The Effects of Several Physicochemical Factors on the Degradation of 1,4-Dioxane by Shinella granuli CK-4 in Bench-scale Bioreactors
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Choi Moon-Seop
Choi Ki-Seung
Oh Kye-Heon
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Abstract
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Our previous research has demonstrated that Shinella granuli CK-4 is capable of utilizing 1,4-dioxane as its sole source of carbon and energy when isolated from industrial wastewater [1]. In this study, we have extended this work to investigate the relationships between 1,4-dioxane degradation and the strain CK-4 and several relevant physicochemical environmental parameters in 3 L bench-scale bioreactors. One gram of 1,4-dioxane per liter was completely degraded within 96 hours of incubation, and the optimum temperature for 1,4-dioxane degradation was 30oC. 1,4-Dioxane degradation by CK-4 gradually increased as a function of airflow rate and agitation speed, and the optimum airflow rate and agitation speed were 2.5 L/min and 500 rotation per minutes, respectively, in this study. The addition of 50 mg/L tetrahydrofuran as a supplemental carbon source was found to stimulate the maximal bacterial growth and 1,4-dioxane degradation. The optimum results obtained from these experiments were combined and applied for 1,4-dioxane degradation. As a result, the complete degradation of 1,4-dioxane was achieved with the CK-4 culture within 72 hours of incubation. We explored the feasibility of using the cultures of S. granuli CK-4 for the degradation of 1,4-dioxane with the aim of microbial application in industrial wastewater treatment in bench-scale bioreactors.
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KEYWORD
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Shinella granuli CK-4, 1,4-dioxane, biodegradation, industrial wastewater
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