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Assessing the feasibility of sequential aerobic respiration and heterotrophic denitrification of a high-strength mixture of phenol and its derivatives in the field single-well-drift test

Authors
Han, KyungjinHong, UijeonKim, Young-WanKwon, SooyoulKim, Young
Issue Date
1월-2020
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Phenol; Cresol isomers; Xylenol isomers; In situ bioremediation; Aerobic respiration; Heterotrophic denitrification
Citation
CHEMOSPHERE, v.239
Indexed
SCIE
SCOPUS
Journal Title
CHEMOSPHERE
Volume
239
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/58414
DOI
10.1016/j.chemosphere.2019.124800
ISSN
0045-6535
Abstract
Biological degradation of high strength phenol and its derivatives in groundwater is problematic because these compounds are toxic to human and microbes. To evaluate the feasibility of in situ bioremediation using sequential aerobic respiration and heterotrophic denitrification, a field single-well-drift test (SWDT) was conducted in groundwater contaminated with coal tar distillates. To stimulate indigenous phenol degrading microorganisms, a 1400 L of oxygen-saturated test solution containing bromide (3.96 +/- 0.179 mmol-Br/L) and nitrate (5.34 +/- 0.187 mmol NO3 -NFL) was injected into an aquifer. After injection of the test solution, significant consumption of dissolved oxygen (DO) was immediately observed; then, degradation of the methyl derivatives o-cresol and m,p-cresol was observed with average zero-order rate coefficients of 0.047 mmol/L/d and 0.23 mmolilicl, respectively. After 73% of the injected DO was consumed, significant NOI consumption was observed along with degradation of phenol and the dimethyl derivatives 2,4-xylenol and 3,5-xylenol, which had average zero-order rate coefficients of 0.17 mmol/L/d, 0.060 mmol/L/d, and 0.018 mmol/L/d, respectively. The production of CO2, NO2-, and N2O along with significant consumption of DO and NO3- suggest that phenolic compounds were biologically degraded by sequential aerobic respiration and heterotrophic denitrification. The results of 16s RNA analysis revealed that, after injection of the test solution, a bacterium that shared a 99% 16s rRNA sequence similarity with an uncultured bacterium revealed to be Pseudomonas stutzeri, a facultative heterotrophic denitrifier, was found in the aquifer. Thus, these results suggest that simultaneous injection of DO and NO3- is an appropriate in situ bioremediation strategy for degrading mixtures of high-strength phenolic compounds in an aquifer. (C) 2019 Elsevier Ltd. All rights reserved.
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과학기술대학 (환경시스템공학과)
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