Enhancing chlorophenol biodegradation: Using a co-substrate strategy to resist photo-H2O2 stress in a photocatalytic-biological reactor

Zhao, Mingyue; Shi, Junlong; Zhao, Zihan; Zhou, Dandan; Dong, Shuangshi

doi:10.1016/j.cej.2018.07.018

Cited by 40 publications

(13 citation statements)

References 49 publications

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“…31,47 More importantly, •OH was produced by electro-Fenton reaction in situ, and its halflife was as short as 4 × 10 −9 s. As a result, •OH could negligibly damage biofilm. 48 The phenol concentration in the influent was 10 mg/L, and the HRT was 8 h.…”

Section: Resultsmentioning

confidence: 99%

Shewanella Drive Fe(III) Reduction to Promote Electro-Fenton Reactions and Enhance Fe Inner-Cycle

Zhao

Cui

et al. 2020

ACS EST Water

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The slow reduction of Fe(III) to Fe(II) in electro-Fenton technology limits pollutant removal and causes Fe sludge production. This study hypothesizes that Shewanella, a dissimilatory iron-reducing bacteria, can accelerate the iron reduction of the Fenton reaction. A Shewanella biofilm coupled with Fe2O3 coated electrode (F/S) was used to drive the electro-Fenton reaction, and compared the results with the singlet Fe2O3 (F) anode and Shewanella biofilm anode (S). Meanwhile, dissolved oxygen (DO) is studied as an important influencing factor. The suitable DO was verified at ∼2 mg/L, phenol removal of F/S was 67% higher than that of the sum of three other singlet systems. The chemical oxygen demand (COD) removal was 72% and 50% higher than that of F and S, respectively. F/S corrosion current (I corr) was 6.3 times higher than F, and induced hematite to transform into Fe2PO5 and FeOOH on the anode. Long-term operation showed that phenol was almost 100% removed for F/S; COD removal was generally 20% higher than F; thus, the toxicity of the effluent could be significantly decreased. The total Fe loss did not exceed 10% at the end of operation. This paper provides a feasibly novel method for electro-Fenton reaction, by employing Fe-reducing bacteria.

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Section: Resultsmentioning

confidence: 99%

Shewanella Drive Fe(III) Reduction to Promote Electro-Fenton Reactions and Enhance Fe Inner-Cycle

Zhao

Cui

et al. 2020

ACS EST Water

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“…In previous reports, intracellular ROS could be increased under photocatalysis. , To explore the connection between osmotic pressure and ROS, we examined expression of genes encoding superoxide radical degradation enzymes as a measure for probing levels of intracellular ROS (Figure c and Table S3). In comparisons of MT50 and WT50 with MT100 and WT100, five genes encoding the superoxide radical inactivation enzymes catalase HPII, superoxide dismutase [Mn], superoxide dismutase [Cu-Zn], superoxide dismutase [Fe], and catalase-peroxidase ,, were all down-regulated.…”

Section: Results and Discussionmentioning

confidence: 99%

Cellular Response ofEscherichia colito Photocatalysis: Flagellar Assembly Variation and Beyond

et al. 2019

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Bacterial cells can be inactivated by external reactive oxygen species (ROS) produced by semiconductor photocatalysis. However, little is known about cellular responses to photocatalysis. For a better understanding of this issue, one strain of Escherichia coli (E. coli, hereafter named as MT), which has an increased ability to metabolize carbon sources, was screened out from the wild-type (WT) E. coli K12 by repeated exposure to photocatalysis with palladium oxide modified nitrogen-doped titanium dioxide. In this study, transcriptome sequencing of the WT and MT strains that were exposed or unexposed to photocatalysis were carried out. Cellular responses to photocatalysis were inferred from the functions of genes whose transcripts were either increased or decreased. Upregulation of expression of bacterial flagellar assembly genes used for chemotaxis was detected in cells exposed to semilethal photocatalytic conditions of the WT E. coli. Increased capability to degrade superoxide radicals and decreased bacterial flagellar assembly and chemotaxis were observed in MT E. coli compared to WT cells. We conclude that the differences in motility and intracellular ROS between MT and WT are directly related to survivability of E. coli during exposure to photodisinfection.

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“…Intimately coupled photocatalysis and biodegradation (ICPB) can remove high concentrations of highly toxic organic pollutants effectively (e.g., phenols, dyes, antibiotics, etc. ). − However, the porous photocatalyst support used in the current ICPB system can cause low light transmittance, high light absorption, and high carrier recombination, which will reduce the photocatalytic activity of the immobilized catalyst. , Furthermore, the bacterial biofilm on the carrier has shortcomings such as low reusability, low biomass energy yield, and high cost, further limiting the development of ICPB technology. Unfortunately, due to the long-held knowledge of microalgae and chemical oxidant incompatibility, there have not been any reports of an intimately coupled photocatalysis and biodegradation degradation circulating system for the rapid and continuous degradation of toxic phenolic pollutants and conversion to microalgal biomass. − …”

Section: Introductionmentioning

confidence: 99%

Rapid and Sustainable Conversion of Phenol to Microalgae Biomass

Yuan

Chen

Xiang

et al. 2021

ACS Sustainable Chem. Eng.

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Rapid and continuous degradation of toxic organic pollutants and conversion to microalgae biomass are attracting enormous interest for resource recovery and wastewater treatment. Aiming toward this goal, we develop and demonstrate a novel photocatalytic-biological system in which photocatalytic optical hollow fibers coated with the N-doped TiO 2 photocatalyst and a Scenedesmus obliquus biofilm cooperatively convert phenol to microalgae biomass. The photocatalytic optical hollow fibers exhibit high UV−visible photocatalytic activity to rapidly degrade phenol and emit visible light for biofilm growth, lipid synthesis, and O 2 production. O 2 produced as an electron acceptor is transferred to the surface of the photocatalytic optical hollow fibers, limiting electron−hole recombination and generating reactive oxygen species such as • OH and • O 2 − . Upregulation of nicotinamide adenine dinucleotide + hydrogen and adenosine triphosphate and enrichment of Rhodococcus and Pseudomonas in the biofilm enhance the resistance to phenol toxicity, maintain rapid and stable biofilm growth, and increase lipid content. This photocatalyticbiological system rapidly and sustainably converts phenol to microalgae biomass.

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Enhancing chlorophenol biodegradation: Using a co-substrate strategy to resist photo-H2O2 stress in a photocatalytic-biological reactor

Cited by 40 publications

References 49 publications

Shewanella Drive Fe(III) Reduction to Promote Electro-Fenton Reactions and Enhance Fe Inner-Cycle

Shewanella Drive Fe(III) Reduction to Promote Electro-Fenton Reactions and Enhance Fe Inner-Cycle

Cellular Response ofEscherichia colito Photocatalysis: Flagellar Assembly Variation and Beyond

Rapid and Sustainable Conversion of Phenol to Microalgae Biomass

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