Effect of electro-stimulation on activity of heterotrophic denitrifying bacteria and denitrification performance

Liu, Hengyuan; Tong, Shuang; Chen, Nan; Liu, Ying; Feng, Chuanping; Hu, Qili

doi:10.1016/j.biortech.2015.07.076

Cited by 61 publications

(21 citation statements)

References 29 publications

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“…The qRT-PCR was able to measure growth of B. subtilis in terms of the 16S rDNA gene number. ATP is present in all living microorganisms as the basic energy molecule, it could be applied to determine cellular activity and measure active biomass 10 11 . As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Biotransformation of ferulic acid to vanillin in the packed bed-stirred fermentors

Yan

Chen

Zhang

et al. 2016

Sci Rep

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We performed the biotransformation of ferulic acid to vanillin using Bacillus subtilis (B. subtilis) in the stirring packed-bed reactors filled with carbon fiber textiles (CFT). Scanning electron microscope (SEM), HPLC, qRT-PCR and ATP assay indicated that vanillin biotransformation is tightly related to cell growth, cellar activity and the extent of biofilm formation. The biotransformation was affected by hydraulic retention time (HRT), temperature, initial pH, stirring speed and ferulic acid concentration, and the maximum vanillin production was obtained at 20 h, 35 °C, 9.0, 200 rpm, 1.5 g/L, respectively. Repeated batch biotransformation performed under this optimized condition showed that the maximum productivity (0.047 g/L/h) and molar yield (60.43%) achieved in immobilized cell system were 1.84 and 3.61 folds higher than those achieved in free cell system. Therefore, the stirring reactor packed with CFT carrier biofilm formed by B. subtilis represented a valid biocatalytic system for the production of vanillin.

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Section: Resultsmentioning

confidence: 99%

Biotransformation of ferulic acid to vanillin in the packed bed-stirred fermentors

Yan

Chen

Zhang

et al. 2016

Sci Rep

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“…In the bioelectrochemical reactor, the pH increase might be caused by the formation of hydroxyl ions during the electrolysis of water and denitrification [11]. In addition, the increase in alkalinity might be a result of corrosion of the anode [39]. Huang et al [40] used sodium bicarbonate, glucose, and starch as a carbon source in wastewater with a C COD /N NO3 ratio of 2.0 and a reactor with an electric current flow of 25 mA.…”

Section: Nitrogen Compound Removalmentioning

confidence: 99%

Influence of Carbon Source on the Efficiency of Nitrogen Removal and Denitrifying Bacteria in Biofilm from Bioelectrochemical SBBRs

Kłodowska

Rodziewicz

Janczukowicz

et al. 2018

Water

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Bioelectrochemical sequencing batch biofilm reactors (SBBRs) may be used as post-anoxic reactors. The aim of this study was to determine how nitrate removal depends on the type of external carbon source and the electric current density (J). The effect of citric acid and potassium bicarbonate on N removal efficiency and the denitrifying bacteria biofilm community at an electric current density of 105 and 210 mA/m 2 was determined. Nitrogen removal efficiency depended on the density of the electric current and the carbon source. The highest efficiency of N removal was in the reactor with 210 mA/m 2 and citric acid. Regardless of the J value, the addition of an external carbon source to the reactors resulted in a 4-6 fold increase in the relative number of denitrifying bacteria in the biomass in relation to the reactor operated without an electric current flow and organics in the influent. The highest number of denitrifiers was observed in the reactor with an inorganic carbon source and with a density of 105 mA/m 2. The main factor determining the shifts in composition of the denitrifying bacteria was the electric current flow. In the reactors operated with the electric current flow, Thauera aminoaromatica MZ1T occurred in the reactors with potassium bicarbonate while Alicycliphilus denitrificans K601 preferred citric acid.

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“…During the denitrification process, nitrogen is transformed into NH3 or N2 gas by increasing the activities of the denitrifying bacteria [20]. However, the metabolism of the denitrifying bacteria is likely to be suppressed in a high salinity range.…”

Section: Contaminant Release Rate In Relation To Salinity Differencesmentioning

confidence: 99%

Impact of Salinity Change on Water Quality Variables from the Sediment of an Artificial Lake under Anaerobic Conditions

Kim

Kang

Kim³

et al. 2017

Sustainability

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Artificial reservoirs are created by dike construction in coastal areas to secure the agricultural water supply on the west coast of South Korea. These systems are found to retain brackish characteristics until total desalination is achieved. To evaluate the effects of salinity on the organic substances released from the sediment, a laboratory water-sediment column experiment was conducted to assess associated changes in water quality variables such as the sediment oxygen demand (SOD), chemical oxygen demand (COD), and concentrations of nitrogen (N) and phosphorus (P). Under high salinity conditions, the release of N from the sediment was promoted with the enhancement of SOD and COD. This trend was accounted for by the response of the microorganisms (cell breakdown of algae and suppression of metabolic activity). Our results suggest that chemicals (N, P, and COD) released from sediment and its overall impact on the water quality of a brackish lake should vary depending on the temporal and spatial dynamics of the salinity.

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Effect of electro-stimulation on activity of heterotrophic denitrifying bacteria and denitrification performance

Cited by 61 publications

References 29 publications

Biotransformation of ferulic acid to vanillin in the packed bed-stirred fermentors

Biotransformation of ferulic acid to vanillin in the packed bed-stirred fermentors

Influence of Carbon Source on the Efficiency of Nitrogen Removal and Denitrifying Bacteria in Biofilm from Bioelectrochemical SBBRs

Impact of Salinity Change on Water Quality Variables from the Sediment of an Artificial Lake under Anaerobic Conditions

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