Simultaneous di-oxygenation and denitrification in an internal circulation baffled bioreactor

Jiang, Ling; Tang, Yingxia; Sun, Weihua; Yi, Na; Zhang, Yongming; Shi, Hanchang; Rittmann, Bruce E.

doi:10.1007/s10532-017-9788-7

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…However, due to its instability, indoxyl is only a proposed intermediate, 18–20 which is readily oxidized in the presence of oxygen, 11 followed by a fast non‐enzymatic dehydration reaction to get isatin 12 . Next, a series of oxygenation, decarboxylation, and deamination reactions convert isatin to catechol, which is further decomposed into organic acids, 13,21–23 and they can be oxidized to form intracellular electron carriers to prompt the initial mono‐oxygenation step and any other donor‐requiring steps . 24,25…”

Section: Introductionmentioning

confidence: 99%

“…However, due to its instability, indoxyl is only a proposed intermediate, [18][19][20] which is readily oxidized in the presence of oxygen, 11 followed by a fast non-enzymatic dehydration reaction to get isatin. 12 Next, a series of oxygenation, decarboxylation, and deamination reactions convert isatin to catechol, which is further decomposed into organic acids, 13,[21][22][23] and they can be oxidized to form intracellular electron carriers to prompt the initial monooxygenation step and any other donor-requiring steps . 24,25 For some hydrocarbon compounds, in their aerobic biodegradation, the initial rate-limiting step is catalyzed by a mono-oxygenase and needs two co-substrates: a reduced electron carrier (e.g., NADH + H + , described as 2H in Figure 1) 17,26,27 and molecular oxygen (O 2 ).…”

Section: Introductionmentioning

confidence: 99%

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The role of oxygen and electron donors in indole biodegradation and mineralization

Shan

2022

Env Prog and Sustain Energy

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Indole is a recalcitrant compound whose aerobic biodegradation is triggered by a mono-oxygenation process. Generally, the mono-oxygenation process involves intracellular electron carriers and molecular oxygen as co-substrates; the increase of concentrations for either one can accelerate the biotransformation of refractory substances. In this study, the initial biotransformation of indole proved to be a special mono-oxygenation reaction, neither endogenous nor exogenous electron donors have influences on indole biodegradation. However, oxygen plays a significant role in indole mono-oxygenation. Higher dissolved oxygen led to a faster rate of indole biodegradation. As the product of indole mono-oxygenation, unstable indoxyl indirectly turned out to exist by its tautomer 2-oxindole. Intermediates like isatin, N-formylanthranilic acid, and anthranilic acid were confirmed. In addition, coupling biodegradation with UV photolysis accelerated indole mineralization, and longer photolysis time gave faster TOC removal. This is because the supplement of endogenous electron donors by photolysis could enhance the catabolism of isatin and anthranilic acid, thus promoting indole mineralization. The biodegradation of these two intermediates was further verified to be initiated by donor-requiring steps, so the photolytic products which generated labile electron donors could accelerate their oxygenations. This study provides valuable information on further controlling the process of aerobic biodegradation for indole.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The role of oxygen and electron donors in indole biodegradation and mineralization

Shan

2022

Env Prog and Sustain Energy

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Competition for electrons between pyridine and quinoline during their simultaneous biodegradation

Sun

Yan

et al. 2017

Environ Sci Pollut Res

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Biodegradation of pyridine and quinoline is initiated with mono-oxygenation reactions that require an intracellular electron donor. Simultaneous biodegradation of both substrates should set up competition for the intracellular electron donor that may inhibit one or more of the mono-oxygenation steps. An internal circulation baffled biofilm reactor (ICBBR) was used to evaluate the impacts of competition during pyridine and quinoline biodegradation. Compared with independent biodegradation, pyridine and quinoline removal rates were slowed when biodegraded simultaneously, although the pyridine removal rate decreased more than for quinoline. The first mono-oxygenation of quinoline (to 2-hydroxyquinoline) always was faster than the first mono-oxygenation of pyridine (to 2-hydroxypyridine), and the difference was accentuated with pyridine and quinoline which were biodegraded simultaneously due to the competition for intracellular electron donor. Competition also existed between the second mono-oxygenations, and the removal rate of 2-hydroxypyridine was faster than the rate for 2-hydroxyquinoline, even though the rate was faster for quinoline than pyridine. Adding an exogenous electron donor accelerated all mono-oxygenations in proportion to the amount of donor added, but the increments were greater for quinoline due to its higher affinity for intracellular electron donors than pyridine. When actual coking wastewater was used as the background matrix, removals of pyridine and quinoline exhibited the same competitive trends.

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Competition for molecular oxygen and electron donor between phenol and quinoline during their simultaneous biodegradation

Zou

Zhang

Yan

et al. 2018

Process Biochemistry

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Simultaneous di-oxygenation and denitrification in an internal circulation baffled bioreactor

Cited by 3 publications

References 31 publications

The role of oxygen and electron donors in indole biodegradation and mineralization

The role of oxygen and electron donors in indole biodegradation and mineralization

Competition for electrons between pyridine and quinoline during their simultaneous biodegradation

Competition for molecular oxygen and electron donor between phenol and quinoline during their simultaneous biodegradation

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