Impact of continuous and intermittent supply of electric assistance on high-strength 2,4-dichlorophenol (2,4-DCP) degradation in electro-microbial system

Cao, Zhanping; Zhang, Minghui; Zhang, Jingli; Zhang, Hongwei

doi:10.1016/j.biortech.2016.03.165

Cited by 34 publications

(13 citation statements)

References 23 publications

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“…This work studies the effect of the cathodic pH and operating mode of BESs (as MFC or MEC) on the electro-dechlorination of 2,4-dichlorophenol (2,4-DCP). The 2,4-DCP is a relevant chemical compound because it is commonly used in chemical industry (Cao et al, 2016) and especially as raw product for the fabrication of widely used pesticides such as 2,4-dichlorophenoxyacetic acid (Carboneras et al, 2017). Research coupling bioanodes and ERDC processes at the cathode is still scarce, and no studies for 2,4-DCP dechlorination by means of BESs have been reported to date.…”

Section: Introductionmentioning

confidence: 99%

Bio-electrocatalytic dechlorination of 2,4-dichlorophenol. Effect of pH and operational configuration

León-Fernandez

Rodrigo

Villaseñor

et al. 2021

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Bio-electrocatalytic dechlorination of 2,4-dichlorophenol. Effect of pH and operational configuration

León-Fernandez

Rodrigo

Villaseñor

et al. 2021

Electrochimica Acta

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“…Moreover, the protein content in TB‐EPS was positively correlated with c‐di‐GMP content. The biosynthesis of hydrophobic groups (Cao et al ., 2016) from protein was modulated by c‐di‐GMP through genes encoding for enzymes (Kumar et al ., 2018). Therefore, the increase in c‐di‐GMP content was conducive to biomass aggregation, which improved the stabilization of the denitrification biofilms.…”

Section: Resultsmentioning

confidence: 99%

Correlation of extracellular polymeric substances and microbial community structure in denitrification biofilm exposed to adverse conditions

Wang

Zhi

Shan

et al. 2020

Microbial Biotechnology

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Microbial community may respond to different adverse conditions and result in the variation of extracellular polymeric substances (EPS) in denitrification biofilm; this study discovered the role of EPS in accordance with the analysis of cyclic diguanylate (c-di-GMP) and electron equilibrium (EE) under low organic loading rate, shock organic loading rate and low temperature conditions. Good nitrate removal performance could be achieved under shock organic loading rate and low temperature conditions; however, owing to the low organic loading rate, the carbon source was preferentially utilized for biomass growth. Tightly bound EPS (TB-EPS) contents progressively increased and facilitated cell adhesion and biofilm formation. The stable TB protein (TB-PN) content in TB-EPS built a cross-linked network to maintain internal biofilm structure and led to the rapid biosynthesis of polysaccharides, which could further enhance microbial adhesion and improve nitrate removal. C-di-GMP played an important role in biomass retention and biofilm formation, based on the correlation analysis of c-di-GMP and EPS. TB polysaccharide (TB-PS) contents presented a significant positive correlation with c-di-GMP content, microbial adhesion and biofilm stabilization was further enhanced through c-di-GMP regulation. In addition, a remarkable negative correlation between electron deletion rate (EDR) and TB-PN and TB-PS was discovered, and TB-PS was required to serve as energy source to enhance denitrification according to EE analysis. Surprisingly, dynamic microbial community was observed due to the drastic community succession under low temperature conditions, and the discrepancy between the dominant species for denitrification was found under shock organic loading rate and low temperature conditions. The notable increase in bacterial strains Simlicispira, Pseudomonas and Chryseobacterium was conducive to biofilm formation and denitrification under shock organic loading rate, while Dechloromonas and Zoogloea dramatically enriched for nitrate removal under low temperature conditions. The high abundance of Dechloromonas improved the secretion of EPS through the downstream signal transduction, and the c-di-GMP conserved in Pseudomonas concurrently facilitated to enhance exopolysaccharide production to shock organic loading rate and low temperature conditions.

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“…Petersen matrix, containing the stoichiometric values (α) for the main processes taking place in the MFC for CPs removal Process (j) names: (1) non-electrogenic biomass growth coupled to acetate utilization under anaerobic conditions; (2) non-electrogenic biomass death and endogenous respiration; (3) kinetics (i.e., several parallel reactions on the cathode), the factor containing the electrode polarization is also included within the µ max,e parameter (similarly to the previous point). If the external resistor was modified, a new fitting of µ max,e parameter would be required.…”

Section: Tablementioning

confidence: 99%

Modelling the cathodic reduction of 2,4-dichlorophenol in a microbial fuel cell

León-Fernandez

Fernández-Morales

Villaseñor

2022

Bioprocess Biosyst Eng

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This work presents a simplified mathematical model able to predict the performance of a microbial fuel cell (MFC) for the cathodic dechlorination of 2,4-dichlorophenol (2,4-DCP) operating at different cathode pH values (7.0 and 5.0). Experimental data from previous work were utilized for the fitting of the model. The MFC modelled consisted of two chambers (bioanode and abiotic cathode), wherein the catholyte contained 300 mg L−1 of 2,4-DCP and the anolyte 1000 mg L−1 of sodium acetate. The model considered two mixed microbial populations in the anode compartment using sodium acetate as the carbon source for growth and maintenance: electrogenic and non-electrogenic biomass. 2,4-DCP, its intermediates of the reductive process (2-chlorophenol, 2-CP and 4-chlorophenol, 4-CP) and protons were considered in the model as electron acceptors in the electrogenic mechanism. The global process rate was assumed to be controlled by the biological mechanisms and modelled using multiplicative Monod-type equations. The formulation of a set of differential equations allowed to describe the simultaneous evolution of every component: concentration of sodium acetate in the anodic compartment; and concentration of 2,4-DCP, 2-CP, 4-CP, phenol and chloride in the cathode chamber. Current production and coulombic efficiencies were also estimated from the fitting. It was observed that most of the organic substrate was used by non-electrogenic mechanism. The influence of the Monod parameters was more important than the influence of the biomass yield coefficients. Finally, the model was employed to simulate different scenarios under distinct experimental conditions.

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Impact of continuous and intermittent supply of electric assistance on high-strength 2,4-dichlorophenol (2,4-DCP) degradation in electro-microbial system

Cited by 34 publications

References 23 publications

Bio-electrocatalytic dechlorination of 2,4-dichlorophenol. Effect of pH and operational configuration

Bio-electrocatalytic dechlorination of 2,4-dichlorophenol. Effect of pH and operational configuration

Correlation of extracellular polymeric substances and microbial community structure in denitrification biofilm exposed to adverse conditions

Modelling the cathodic reduction of 2,4-dichlorophenol in a microbial fuel cell

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