Pathways of nitrobenzene degradation in horizontal subsurface flow constructed wetlands: Effect of intermittent aeration and glucose addition

Kirui, Wesley Kipkemoi; Wu, Shubiao; Kizito, Simon; Carvalho, Pedro N.; Dong, Renjie

doi:10.1016/j.jenvman.2015.10.001

Cited by 23 publications

(15 citation statements)

References 33 publications

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“…Methane emission was directly influenced by the quantitative variation in methanogenic and methanotrophic bacteria . Meanwhile, the activities of these microbial populations were influenced by water temperature, pH, Eh, water quality, water table level, and so on . The PCA results indicate that the water temperature was the main factor affecting the CH 4 emissions in the two‐stage VSSF CW.…”

Section: Resultsmentioning

confidence: 97%

“…Vertical subsurface‐flow constructed wetlands provide a good anaerobic environment for methanogenic bacteria, and so they have been considered as emission sources with high CH 4 emission potential . Methane emission is not only affected by microorganisms but it is also influenced by environmental factors such as redox conditions (Eh), potential of hydrogen (pH), temperature, organic loading, and aeration, especially for the carbon source . The carbon source is a key factor in the process of denitrification in CWs, because it can provide the energy for the cell life activities for microbial growth.…”

Section: Introductionmentioning

confidence: 99%

“…Sources such as glucose, wheat straw, ethanol, methanol, plant materials, starch, and cellulose can enhance wastewater purification efficiency in CWs. The efficiency with which organic pollutants such as nitrogen and phosphorus are removed when carbon sources are added in CWs is an issue of concern . Urea, a common material in industry, agriculture, the environment, commerce, and medicine, can be used in CWs because external carbon sources are typically added to adjust operations in CWs .…”

Section: Introductionmentioning

confidence: 99%

“…10 Methane emission is not only affected by microorganisms but it is also influenced by environmental factors such as redox conditions (Eh), potential of hydrogen (pH), temperature, organic loading, and aeration, especially for the carbon source. 9,11 The carbon source is a key factor in the process of denitrification in CWs, 12 because it can provide the energy for the cell life activities for microbial growth. Carbon sources in CWs include internal carbon sources and external carbon sources.…”

Section: Introductionmentioning

confidence: 99%

“…The efficiency with which organic pollutants such as nitrogen and phosphorus are removed when carbon sources are added in CWs is an issue of concern. 6, 9,11,12 Urea, a common material in industry, agriculture, the environment, commerce, and medicine, can be used in CWs because external carbon sources are typically added to adjust operations in CWs. 20 It is necessary to add an extra carbon source to balance the nutrition ratio of the biochemical system in CWs.…”

Section: Introductionmentioning

confidence: 99%

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Impact of external carbon source addition on methane emissions from a vertical subsurface‐flow constructed wetland

Liu¹,

et al. 2019

Greenhouse Gases

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In this study, different concentrations of urea (0, 12.1, 30, 45, 61 and 80 mmol·L−1) were added separately, as external carbon sources, to a two‐stage vertical subsurface‐flow constructed wetland (VSSF CW) where Cyperus alternifolius L. was planted, with the aim of understanding methane (CH4) emissions driven by urea. Results indicate that the average CH4 emissions from a two‐stage VSSF CW were 6.88, 7.11, 6.22, 7.45, 5.06 and 2.80 mol·m−2·day−1, corresponding to urea concentrations of 0, 12.1, 30, 45, 61 and 80 mmol·L−1 added in the VSSF CW, respectively. Urea as a carbon source had an average of 31.57% of influent total organic carbon (TOC). It was transformed into CH4‐C, of which CH4‐C/TOCinfluent may be be considered as an important component when anthropogenic methanogenesis from treatment wetlands was driven by carbon sources or carbon loading. Methane emissions were at their lowest when the C/N ratio was 5.89, at a urea concentration of 80 mmol·L−1. Principal component analysis (PCA) indicates that CH4 correlated positively with temperature and redox conditions (Eh). Methane emissions driven by urea in the two‐stage VSSF CW were found to be in accordance with the second‐rate dynamics kinetic model (kinetic constant = 22.94 mg CH4·h−1, R2 = 0.99), which can be considered as a high level of CH4 emissions. It indicates that external carbon sources can influence CH4 emissions from two‐stage VSSF CW significantly. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of external carbon source addition on methane emissions from a vertical subsurface‐flow constructed wetland

Liu¹,

et al. 2019

Greenhouse Gases

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Dual functions of activated carbon air‐cathode: Nitrobenzene removal and electricity production in microbial fuel cells

et al. 2022

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The removal of nitrobenzene (NB) in microbial electrochemical systems generally requires electrical power to operate systems in the mode of microbial electrolysis cells (MECs). The present study demonstrates that single‐chamber microbial fuel cells (S‐MFCs) assembled with a bioanode and an activated carbon (AC) air cathode could simultaneously remove NB and generate electricity. S‐MFCs with 1 mM NB exhibit long term NB tolerance and stable electricity production, with NB removal up to 98% in an operation cycle and a maximum power of 16.2 ± 1.3 W m−3. High NB loadings significantly inhibited the activity of anodic biofilms, but the inhibition was reversible. Investigating the removal of NB and its reduction product aniline (AN) in different operations supported the fact that the adsorption at the AC air cathode is the main pathway for the removal of NB and AN from solution, except for the partial conversion of NB to AN by anaerobic reduction in solution. In S‐MFCs, the activated carbon in the cathode plays both functions: catalyzing the oxygen reduction reaction and adsorbing NB and AN, so that the S‐MFC assembled with the AC air cathode, unlike most NB removing MECs, functions as a system with both NB removal and electricity production.

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Efficient removal of nitrobenzene and concomitant electricity production by single-chamber microbial fuel cells with activated carbon air-cathode

Zhang

Wang

Zhai

et al. 2017

Bioresource Technology

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Single-chamber microbial fuel cells (S-MFCs) with bio-anodes and activated carbon (AC) air-cathodes showed high nitrobenzene (NB) tolerance and NB removal with concomitant electricity production. The maximum power over 25Wm could be obtained when S-MFCs were operated in the NB loading range of 1.2-6.2molmd, and stable electricity production over 13.7Wm could be produced in a NB loading range of 1.2-14.7molmd. The present S-MFCs exhibited high NB removal performance with NB removal efficiency over 97% even when the NB loading rate was increased to 17.2molmd. The potential NB reduced product (i.e. aniline) could also be effectively removed from influents. The findings in this study means that single-chamber MFCs assembled with pre-enriched bio-anodes and AC air-cathodes could be developed as effective bio-electrochemical systems to remove NB from wastewaters and to harvest energy instead of consuming energy.

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Pathways of nitrobenzene degradation in horizontal subsurface flow constructed wetlands: Effect of intermittent aeration and glucose addition

Cited by 23 publications

References 33 publications

Impact of external carbon source addition on methane emissions from a vertical subsurface‐flow constructed wetland

Impact of external carbon source addition on methane emissions from a vertical subsurface‐flow constructed wetland

Dual functions of activated carbon air‐cathode: Nitrobenzene removal and electricity production in microbial fuel cells

Efficient removal of nitrobenzene and concomitant electricity production by single-chamber microbial fuel cells with activated carbon air-cathode

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