Sulfate removal rate and metal recovery as settling precipitates in bioreactors: Influence of electron donors

Costa, Rachel Biancalana; Godoi, Leandro Augusto Gouvêa de; Braga, Adriana Ferreira Maluf; Delforno, Tiago Palladino; Bevilaqua, Denise

doi:10.1016/j.jhazmat.2020.123622

Cited by 20 publications

(7 citation statements)

References 72 publications

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“…In detail, the comparison across sites highlighted a higher contribution of Latescibacterota, AKAU4049 and BD2-11 at site S1, while of Ignavibacteria and Calditrichia at S2, of Bdellovibrionia at S3, and of Desulfobulbia at S4 (Supplementary Figure S2). Members of all these classes are abundant in environments rich in HMs and/or hydrocarbons, suggesting their quantitative and possibly functional relevance in marine sediments that display high concentrations of such contaminants (Lanoil et al, 2001;Iino et al, 2010;Youssef et al, 2015;Cerqueira et al, 2017;Bergo et al, 2020;Jin et al, 2020;Costa et al, 2021). In particular, the differences in the relative contribution of these taxa across the sites of the Bagnoli Coroglio Bay suggest that the specific contaminants present at each benthic site might contribute to determine a local increase of bacterial taxa, which are elsewhere rare.…”

Section: Resultsmentioning

confidence: 99%

Highly Contaminated Marine Sediments Can Host Rare Bacterial Taxa Potentially Useful for Bioremediation

et al. 2021

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Coastal areas impacted by high anthropogenic pressures typically display sediment contamination by polycyclic aromatic hydrocarbons (PAHs) and heavy metals (HMs). Microbial-based bioremediation represents a promising strategy for sediment reclamation, yet it frequently fails due to poor knowledge of the diversity and dynamics of the autochthonous microbial assemblages and to the inhibition of the target microbes in the contaminated matrix. In the present study, we used an integrated approach including a detailed environmental characterization, high-throughput sequencing and culturing to identify autochthonous bacteria with bioremediation potential in the sediments of Bagnoli-Coroglio (Gulf of Naples, Mediterranean Sea), a coastal area highly contaminated by PAHs, aliphatic hydrocarbons and HMs. The analysis of the benthic prokaryotic diversity showed that the distribution of the dominant taxon (Gammaproteobacteria) was mainly influenced by PAHs, As, and Cd concentrations. The other abundant taxa (including Alphaproteobacteria, Deltaproteobacteria, Bacteroidetes, Acidobacteria, Actinobacteria, NB1-j, Desulfobacterota, and Myxococcota) were mainly driven by sediment grain size and by Cu and Cr concentrations, while the rare taxa (i.e., each contributing <1%) by As and aliphatic hydrocarbons concentrations and by sediment redox potential. These results suggest a differential response of bacterial taxa to environmental features and chemical contamination and those different bacterial groups may be inhibited or promoted by different contaminants. This hypothesis was confirmed by culturing and isolating 80 bacterial strains using media highly enriched in PAHs, only nine of which were contextually resistant to high HM concentrations. Such resistant isolates represented novel Gammaproteobacteria strains affiliated to Vibrio, Pseudoalteromonas, and Agarivorans, which were only scarcely represented in their original assemblages. These findings suggest that rare but culturable bacterial strains resistant/tolerant to high levels of mixed contaminants can be promising candidates useful for the reclamation by bioaugmentation strategies of marine sediments that are highly contaminated with PAHs and HMs.

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Section: Resultsmentioning

confidence: 99%

Highly Contaminated Marine Sediments Can Host Rare Bacterial Taxa Potentially Useful for Bioremediation

et al. 2021

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“…Sulfate-reducing bacteria can be found in both natural and anthropogenic environments where sulfate is present, such as marine and some freshwater sediments, and some industrial wastewaters. These microorganisms catalyse the dissimilatory reduction of sulfate (or elemental sulfur) generating hydrogen sulfide (H 2 S/HS − ) using mostly small molecular weight organic compounds as electron donors ( Costa et al, 2021 ), though some can also use hydrogen ( Lens et al, 2003 ). More than one hundred organic compounds have been reported to serve as electron donors for SRB which grow at circum-neutral pH, including carbohydrates (e.g., fructose and glucose), alcohols (e.g., ethanol, methanol), amino acids (e.g., serine, alanine), monocarboxylic acids (e.g., acetate, propionate), dicarboxylic acids (e.g., fumarate, succinate), aromatic compounds (e.g., phenol) ( Liamleam and Annachhatre, 2007 ; Lakaniemi et al, 2010 ; Cao et al, 2012 ; Hussain et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Comparison of different small molecular weight alcohols for sustaining sulfidogenic bioreactors maintained at moderately low pH

Santos

Johnson

2022

Front. Bioeng. Biotechnol.

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Sulfate-reducing bacteria (SRB) catalyse the dissimilatory reduction of sulfate to hydrogen sulfide using a wide range of small molecular weight organic compounds, and hydrogen, as electron donors. Here we report the effects of different combinations of small molecular weight alcohols on the performance and bacterial composition of a moderately low pH sulfidogenic bioreactor (pH 4.0–5.5) operated at 35°C in continuous flow mode. Ethanol alone and methanol or ethanol used in combination with glycerol were evaluated based on their equivalent amounts of carbon. Although evidenced that methanol was utilised as electron donor to fuel sulfidogenesis at pH 5.5, rates of sulfate reduction/sulfide production were negatively impacted when this alcohol was first introduced to the system, though these rates increased in subsequent phases as a result of adaptation of the microbial community. Further increased dosage of methanol again caused rates of sulfidogenesis to decrease. Methanol addition resulted in perturbations of the bioreactor microbial community, and species not previously detected were present in relatively large abundance, including the sulfate-reducer Desulfovibrio desulfuricans. Ethanol utilization was evidenced by the increase in rates of sulfidogenesis as the dosage of ethanol increased, with rates being highest when the bioreactor was fed with ethanol alone. Concentrations of acetate in the effluent liquor also increased (up to 8 mM) as a result of incomplete oxidation of ethanol. This alcohol continued to be used as the electron donor for sulfate reduction when the bioreactor pH was decreased incrementally (to pH 4.0), but rates of sulfidogenesis decreased. The relative abundance of Dv. desulfuricans diminished as the bioreactor pH was lowered, while that of the acidophilic Firmicute Desulfosporosinus acididurans increased. This study has shown that all three alcohols can be used to fuel microbial sulfidogenesis in moderately acidic liquors, though the cost-effectiveness, availability and toxicity to the microbial community will dictate the choice of substrate.

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“…Environmental pollution has been a serious problem, especially the many kinds of harmful pollutants in water that seriously damage the ecological balance and human health . Traditional technologies for pollution treatment include chemical coagulation, acid precipitation, liquid membrane separation, granular activated carbon, biological treatment technology, and physicochemical method . However, the removal rate of harmful substances is very low, and a secondary pollution may have occurred, which cannot meet the current sewage treatment needs.…”

Section: Introductionmentioning

confidence: 99%

Regulating the Built-In Electric Field of BiOBr by a Piezoelectric Mineral Tourmaline and the Enhanced Photocatalytic Property

Yang

Peng

et al. 2022

Ind. Eng. Chem. Res.

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The prospective strategy to control the electrochemical properties of photocatalysts involves the spontaneous polarization characteristics of ferroelectric materials to adjust the electronic structure of the interface. Herein, we report that the polarization of the BiOBr (BOB) photocatalyst is able to be regulated by the induction of a piezoelectric mineral tourmaline and the enhanced photocatalytic property. The BiOBr photocatalyst with a preferable exposure of high active facet can be synthesized. The built-in electric field can be regulated with various amounts of a piezoelectric mineral tourmaline during the synthesis process. It can be found that the photocatalytic properties toward degradations for both Rhodamine B dye and a colorless phenol pollutant with xenon lamp illumination at room temperature over the composite tourmaline/BiOBr improved effectively as compared to those of pure BiOBr. 2%T/BOB photocatalyst showed the best performance and the overall decomposition of the pollution is twice that of the pure BOB. The results demonstrated that the spontaneous polarization effect of tourmaline led to the variation in the built-in electric field of BiOBr, which facilitated the separation and transport of photogenerated charges and enhanced the photocatalytic properties.

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Sulfate removal rate and metal recovery as settling precipitates in bioreactors: Influence of electron donors

Cited by 20 publications

References 72 publications

Highly Contaminated Marine Sediments Can Host Rare Bacterial Taxa Potentially Useful for Bioremediation

Highly Contaminated Marine Sediments Can Host Rare Bacterial Taxa Potentially Useful for Bioremediation

Comparison of different small molecular weight alcohols for sustaining sulfidogenic bioreactors maintained at moderately low pH

Regulating the Built-In Electric Field of BiOBr by a Piezoelectric Mineral Tourmaline and the Enhanced Photocatalytic Property

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