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Open AccessArticle

Effects of Additional Carbon Sources in the Biodegradation of 1,4-Dioxane by a Mixed Culture

1
Graduate School of Water Resources, Sungkyunkwan University, Suwon-si, Gyeonggi-do 16419, Korea
2
Department of Materials Engineering, Kyonggi University, Suwon 16227, Korea
3
Department of Environmental Engineering and Energy, Myongji University, Yongin-si, Gyeonggi-do 17058, Korea
*
Author to whom correspondence should be addressed.
Water 2020, 12(6), 1718; https://doi.org/10.3390/w12061718
Received: 2 April 2020 / Revised: 2 June 2020 / Accepted: 9 June 2020 / Published: 16 June 2020
A mixed culture utilizing 1,4-dioxane as a sole carbon and energy source was obtained from the activated sludge at a textile wastewater treatment plant. The biodegradation of 1,4-dioxane was characterized by a model based on the Monod equation. The effects of the presence of easily degradable carbon sources other than 1,4-dioxane were investigated using dextrose. Structural analogs commonly found in 1,4-dioxane-containing wastewater such as tetrahydrofuran (THF), 2-methyl-1,3-dioxolane, and 1,4-dioxene were also evaluated for their potential effects on 1,4-dioxane biodegradation. The presence of dextrose did not show any synergetic or antagonistic effects on 1,4-dioxane biodegradation, while the structural analogs showed significant competitive inhibition effects. The inhibitory effects were relatively strong with heptagonal cyclic ethers such as THF and 2-methyl-1,3-dioxolane, and mild with hexagonal cyclic ethers such as 1,4-dioxene. It was also shown that the treatment of 1,4-dioxane in the raw textile wastewater required 170% more time to remove 1,4-dioxane due to the co-presence of 2-methyl-1,3-dioxolane, and the extent of delay depended on the initial concentration of 1,3-doxolane. View Full-Text
Keywords: biodegradation; 1,4-dioxane; structural analog; competitive inhibition; 2-methyl-1,3-dioxolane biodegradation; 1,4-dioxane; structural analog; competitive inhibition; 2-methyl-1,3-dioxolane
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Lee, K.H.; Wie, Y.M.; Jahng, D.; Yeom, I.T. Effects of Additional Carbon Sources in the Biodegradation of 1,4-Dioxane by a Mixed Culture. Water 2020, 12, 1718.

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