Understanding the interdependence of strain of electrotroph, cathode potential and initial Cu(II) concentration for simultaneous Cu(II) removal and acetate production in microbial electrosynthesis systems

Hou, Jiaxin; Huang, Liping; Zhou, Peng; Qian, Yitong; Li, Ning

doi:10.1016/j.chemosphere.2019.125317

Cited by 18 publications

(14 citation statements)

References 64 publications

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“…The accumulation of undissociated carboxylates can decrease the pH to a thermodynamic threshold, resulting in the bioconversion of carboxylates to, for example, alcohols . During the remaining one month’s operation, the acetate slightly decreased to 4.63 ± 0.35 g L –1 (CO-0%), 5.85 ± 0.10 g L –1 (CO-25%), 4.51 ± 0.83 g L –1 (CO-50%), and 4.50 ± 0.17 g L –1 (CO-75%), which were similar to the concentration reported before. , …”

Section: Resultsmentioning

confidence: 99%

“…32 During the remaining one month's operation, the acetate slightly decreased to 4.63 ± 0.35 g L −1 (CO-0%), 5.85 ± 0.10 g L −1 (CO-25%), 4.51 ± 0.83 g L −1 (CO-50%), and 4.50 ± 0.17 g L −1 (CO-75%), which were similar to the concentration reported before. 33,34 A lag phase existed for butyrate and caproate production. Butyrate started to accumulate at days 32−36 in all conditions.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Waste C1 Gases as Alternatives to Pure CO₂ Improved the Microbial Electrosynthesis of C4 and C6 Carboxylates

Chu

Liang

Zhang

et al. 2020

ACS Sustainable Chem. Eng.

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Waste C1 gases as alternatives to pure CO2 can potentially facilitate the practical application of microbial electrosynthesis (MES) for chemical production and further decrease the total cost. This work evaluated the impact of the CO fraction on MES of C2–C6 carboxylates. Using the CO/CO2 mixture as the substrate in MES favors simultaneous acetogenesis, solventogenesis, and chain elongation. The test of CO-50% achieved the best performance of production of C4 and C6 carboxylates, of which the specificity based on the electron recovery was 43.11 ± 1.31% for acetate, 34.11 ± 0.11% for butyrate, and 15.41 ± 1.48% for caproate, while the lag phase was 32 days for butyrate and 44 days for caproate. However, the specificity observed with pure CO2 (CO-0% test) was 85.37 ± 3.24% for acetate, 10.68 ± 2.54% for butyrate, and 0% for caproate. The increase of CO fraction decreased the electron recovery to methane. Microbial diversity analysis demonstrated that the elevated CO fraction increased the relative abundance of Acetobacterium as well as Clostridium. This study proved that waste C1 gases as alternatives to pure CO2 could stimulate the generation of C4 and C6 carboxylates in MES.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Waste C1 Gases as Alternatives to Pure CO₂ Improved the Microbial Electrosynthesis of C4 and C6 Carboxylates

Chu

Liang

Zhang

et al. 2020

ACS Sustainable Chem. Eng.

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“…JY6 and S. maltophilia JY1 have been found to be putative electrotrophs as they can accept electrons from electrodes to reduce Cu(II) in MESs. , Considering that Stenotrophomonas spp. can improve rice productivity through N fixation and production of a plant growth-stimulating hormone in the rice rhizosphere, , the enrichment of this putative electrotroph in the CK soil may benefit the rice yield in long-term unfertilized paddy soil with poor nutrients.…”

Section: Discussionmentioning

confidence: 99%

Long-Term Fertilization Shapes the Putative Electrotrophic Microbial Community in Paddy Soils Revealed by Microbial Electrosynthesis Systems

Ding

Zhu

et al. 2021

Environ. Sci. Technol.

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Electrotrophs play an important role in biogeochemical cycles, but the effects of long-term fertilization on electrotrophic communities in paddy soils remain unclear. Here, we explored the responses of electrotrophic communities in paddy soil-based microcosms to different long-term fertilization practices using microbial electrosynthesis systems (MESs), high-throughput quantitative PCR, and 16s rRNA gene-based Illumina sequencing techniques. Compared to the case in the unfertilized soil (CK), applications of only manure (M); only chemical nitrogen, phosphorous, and potassium fertilizers (NPK); and M plus NPK (MNPK) clearly changed the electrotrophic bacterial community structure. The Streptomyces genus of the Actinobacteria phylum was the dominant electrotroph in the CK, M, and MNPK soils. The latter two soils also favored Truepera of Deinococcus–Thermus or Arenimonas and Thioalkalispira of Proteobacteria. Furthermore, Pseudomonas of Proteobacteria and Bacillus of Firmicutes were major electrotrophs in the NPK soil. These electrotrophs consumed biocathodic currents coupled with nitrate reduction and recovered 18–38% of electrons via dissimilatory nitrate reduction to ammonium (DNRA). The increased abundances of the nrfA gene for DNRA induced by electrical potential further supported that the electrotrophs enhanced DNRA for all soils. These expand our knowledge about the diversity of electrotrophs and their roles in N cycle in paddy soils and highlight the importance of fertilization in shaping electrotrophic communities.

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“…Electrotrophs physiologically respond to changes of the external environment (e.g., circuital current, heavy metals, pH) by releasing extracellular polymeric substances (EPS) and by regulating the activity of intracellular enzymes [8,[52][53][54][55]. Thus, under light irradiation and as a response to the H2O2 produced in-situ, the locally anaerobic micro-environment created by the EPS released by the S. marcescens and the changes of its typical intracellular enzymatic activities, might have allowed for the efficient system performance and long-term stability.…”

Section: Mes Performance With Periodical Addition Of Bicarbonatementioning

confidence: 99%

Efficient production of acetate from inorganic carbon (HCO3–) in microbial electrosynthesis systems incorporating Ag3PO4/g-C3N4 anaerobic photo-assisted biocathodes

Kong

Huang

Quan

et al. 2021

Applied Catalysis B: Environmental

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Understanding the interdependence of strain of electrotroph, cathode potential and initial Cu(II) concentration for simultaneous Cu(II) removal and acetate production in microbial electrosynthesis systems

Cited by 18 publications

References 64 publications

Waste C1 Gases as Alternatives to Pure CO₂ Improved the Microbial Electrosynthesis of C4 and C6 Carboxylates

Waste C1 Gases as Alternatives to Pure CO₂ Improved the Microbial Electrosynthesis of C4 and C6 Carboxylates

Long-Term Fertilization Shapes the Putative Electrotrophic Microbial Community in Paddy Soils Revealed by Microbial Electrosynthesis Systems

Efficient production of acetate from inorganic carbon (HCO3–) in microbial electrosynthesis systems incorporating Ag3PO4/g-C3N4 anaerobic photo-assisted biocathodes

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Understanding the interdependence of strain of electrotroph, cathode potential and initial Cu(II) concentration for simultaneous Cu(II) removal and acetate production in microbial electrosynthesis systems

Cited by 18 publications

References 64 publications

Waste C1 Gases as Alternatives to Pure CO2 Improved the Microbial Electrosynthesis of C4 and C6 Carboxylates

Waste C1 Gases as Alternatives to Pure CO2 Improved the Microbial Electrosynthesis of C4 and C6 Carboxylates

Long-Term Fertilization Shapes the Putative Electrotrophic Microbial Community in Paddy Soils Revealed by Microbial Electrosynthesis Systems

Efficient production of acetate from inorganic carbon (HCO3–) in microbial electrosynthesis systems incorporating Ag3PO4/g-C3N4 anaerobic photo-assisted biocathodes

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Product

Resources

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Waste C1 Gases as Alternatives to Pure CO₂ Improved the Microbial Electrosynthesis of C4 and C6 Carboxylates

Waste C1 Gases as Alternatives to Pure CO₂ Improved the Microbial Electrosynthesis of C4 and C6 Carboxylates