Mercury oxidation coupled to autotrophic denitrifying branched sulfur oxidation and sulfur disproportionation for simultaneous removal of Hg0 and NO

AbstractCable bacteria of the family Desulfobulbaceae couple spatially separated sulfur oxidation and oxygen or nitrate reduction by long-distance electron transfer, which can constitute the dominant sulfur oxidation process in shallow sediments. However, it remains unknown how cells in the anoxic part of the centimeter-long filaments conserve energy. We found 16S rRNA gene sequences similar to groundwater cable bacteria in a 1-methylnaphthalene-degrading culture (1MN). Cultivation with elemental sulfur and thiosulfate with ferrihydrite or nitrate as electron acceptors resulted in a first cable bacteria enrichment culture dominated >90% by 16S rRNA sequences belonging to the Desulfobulbaceae. Desulfobulbaceae-specific fluorescence in situ hybridization (FISH) unveiled single cells and filaments of up to several hundred micrometers length to belong to the same species. The Desulfobulbaceae filaments also showed the distinctive cable bacteria morphology with their continuous ridge pattern as revealed by atomic force microscopy. The cable bacteria grew with nitrate as electron acceptor and elemental sulfur and thiosulfate as electron donor, but also by sulfur disproportionation when Fe(Cl)2 or Fe(OH)3 were present as sulfide scavengers. Metabolic reconstruction based on the first nearly complete genome of groundwater cable bacteria revealed the potential for sulfur disproportionation and a chemo-litho-autotrophic metabolism. The presence of different types of hydrogenases in the genome suggests that they can utilize hydrogen as alternative electron donor. Our results imply that cable bacteria not only use sulfide oxidation coupled to oxygen or nitrate reduction by LDET for energy conservation, but sulfur disproportionation might constitute the energy metabolism for cells in large parts of the cable bacterial filaments.

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Effect of pH on the performance of an acidic biotrickling filter for simultaneous removal of H2S and siloxane from biogas

Water Science & Technology ◽

10.2166/wst.2021.083 ◽

2021 ◽

Vol 83 (7) ◽

pp. 1511-1521

Author(s):

Yuyao Zhang ◽

Kazuyuki Oshita ◽

Masaki Takaoka ◽

Yu Kawasaki ◽

Daisuke Minami ◽

...

Keyword(s):

Mass Transfer ◽

Partition Coefficient ◽

Sodium Hydroxide Solution ◽

Sulfur Oxidation ◽

Linear Increase ◽

Simultaneous Removal ◽

Acidic Ph ◽

Oxidation Activity ◽

Ph Conditions ◽

Low Sulfur

Abstract Acidic biotrickling filters (BTF) can be used for simultaneous removal of hydrogen sulfide (H2S) and siloxane from biogas. In this study, the performance of a BTF under different acidic pH conditions was investigated. The removal profile of H2S showed that 90% of H2S removal was achieved during the first 0.4 m of BTF height with down-flow biogas. Decamethylcyclopentasiloxane (D5) removal decreased from 34.5% to 15.6% when the pH increased from 0.88 to 3.98. Furthermore, the high partition coefficient of D5 obtained in under higher pH condition was attributed to the higher total ionic strength resulting from the addition of sodium hydroxide solution and mineral medium. The linear increase in D5 removal with the mass transfer coefficient (kL) indicated that the acidic recycling liquid accelerated the mass transfer of D5 in the BTF. Therefore, the lower partition coefficient and higher kL under acidic pH conditions lead to the efficient removal of D5. However, the highly acidic pH 0.9 blocked mass transfer of H2S and O2 gases to the recycling liquid. Low sulfur oxidation activity and low Acidithiobacillus sp. content also deteriorated the biodegradation of H2S. Operating the BTF at pH 1.2 was optimal for simultaneously removing H2S and siloxane.

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SIMULTANEOUS REMOVAL OF ASTRAZONE BLUE AND LEAD ONTO LOW COST ADSORBENTS BASED ON POWER PLANT ASH

Environmental Engineering and Management Journal ◽

10.30638/eemj.2011.050 ◽

2011 ◽

Vol 10 (3) ◽

pp. 341-347 ◽

Cited By ~ 9

Author(s):

Maria Harja ◽

Marinela Barbuta ◽

Lacramioara Rusu ◽

Corneliu Munteanu ◽

Gabriela Buema ◽

...

Keyword(s):

Power Plant ◽

Low Cost ◽

Simultaneous Removal ◽

Power Plant Ash ◽

Plant Ash

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Environmental control implications of generating electric power from coal: 1977 technology status report. Appendix G. State-of-the-art review for simultaneous removal of nitrogen oxides and sulfur oxides from flue gas

10.2172/7016699 ◽

1977 ◽

Cited By ~ 1

Author(s):

J.D. Maxwell ◽

H.L. Faucett ◽

T.A. Burnett

Keyword(s):

Nitrogen Oxides ◽

Electric Power ◽

Flue Gas ◽

Environmental Control ◽

State Of The Art ◽

Sulfur Oxides ◽

Status Report ◽

Simultaneous Removal

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Water-Soluble Ions in Atmospheric Aerosol Measured in a Semi-Arid and Chemical-Industrialized City, Northwest China

Atmosphere ◽

10.3390/atmos12040456 ◽

2021 ◽

Vol 12 (4) ◽

pp. 456

Author(s):

Huimin Jiang ◽

Zhongqin Li ◽

Feiteng Wang ◽

Xi Zhou ◽

Fanglong Wang ◽

...

Keyword(s):

Sulfur Oxidation ◽

Northwest China ◽

Water Soluble ◽

Heterogeneous Reactions ◽

Anthropogenic Source ◽

Heating Period ◽

Qinghai Province ◽

Soluble Ions ◽

Water Soluble Ions ◽

Semi Arid

We investigated water-soluble ions (WSIs) of aerosol samples collected from 2016 to 2017 in Lanzhou, a typical semi-arid and chemical-industrialized city in Northwest China. WSIs concentration was higher in the heating period (35.68 ± 19.17 μg/m3) and lower in the non-heating period (12.45 ± 4.21 μg/m3). NO3−, SO42−, NH4+ and Ca2+ were dominant WSIs. The concentration of SO42− has decreased in recent years, while the NO3− level was increasing. WSIs concentration was affected by meteorological factors. The sulfur oxidation and nitrogen oxidation ratios (SOR and NOR) exceeded 0.1, inferring the vital contribution of secondary transformation. Meanwhile higher O3 concentration and temperature promoted the homogeneous reaction of SO2. Lower temperature and high relative humidity (RH) were more suitable for heterogeneous reactions of NO2. Three-phase cluster analysis illustrated that the anthropogenic source ions and natural source ions were dominant WSIs during the heating and non-heating periods, respectively. The backward trajectory analysis and the potential source contribution function model indicated that Lanzhou was strongly influenced by the Hexi Corridor, northeastern Qinghai–Tibetan Plateau, northern Qinghai province, Inner Mongolia Plateau and its surrounding cities. This research will improve our understanding of the air quality and pollutant sources in the industrial environment.

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