Ethanol degradation and the benefits of incremental priming in pilot-scale constructed wetlands

Welz, Pamela J.; Ramond, Jean‐Baptiste; Cowan, Don A.; Prins, Alaric; Burton, Stephanie G.

doi:10.1016/j.ecoleng.2011.03.009

Cited by 20 publications

(14 citation statements)

References 33 publications

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“…We have previously shown that BSF microbial communities exposed to incremental concentrations of ethanol become more tolerant of the contaminant than communities exposed to a higher concentration from outset, a phenomenon classically termed 'microbial acclimation' [28]. In this study, we used the more toxic and recalcitrant compounds, gallic acid and vanillin, and incrementally increased the phenolic concentration of artificial wastewater over a period of 9 weeks.…”

Section: Introductionmentioning

confidence: 99%

Selection of Diazotrophic Bacterial Communities in Biological Sand Filter Mesocosms Used for the Treatment of Phenolic-Laden Wastewater

et al. 2013

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Agri effluents such as winery or olive mill wastewaters are characterized by high phenolic concentrations. These compounds are highly toxic and generally refractory to biodegradation.Biological sand filters (BSFs) represent inexpensive, environmentally friendly and sustainable wastewater treatment systems which rely vastly on microbial catabolic processes. This study aimed to assess the impact of increasing concentrations of synthetic phenolic-rich wastewater,

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Section: Introductionmentioning

confidence: 99%

Selection of Diazotrophic Bacterial Communities in Biological Sand Filter Mesocosms Used for the Treatment of Phenolic-Laden Wastewater

et al. 2013

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“…In contrast, the inter-group similarity of groups BCD and EF was only 40% and ≤20% in the surface and deep sediments, respectively. These results showed that (i) the sand batch was an important determinant of bacterial community composition prior to amendment with AMD, (ii) the 90 day equilibration period was sufficient to establish similar intra-group bacterial communities, despite differences in previous chemical exposure [24,[30][31] and (iii) minor physicochemical differences (Section 3.1.1) in the sand had a significant influence on the bacterial community structure.…”

Section: Analysis Of the Pre-amendment Bacterial Community Structurementioning

confidence: 77%

“…6a). In previous studies, a similar effect was seen, where plug flow forced the existing water in the substrate through the outlet, essentially creating a lag in the emergence of effluent and resulting in an anomalously low concentration of influent chemicals being detected after the first amendment with wastewater (Welz et al, 2011).…”

Section: Neutralization Of Amd In Sand Mesocosmsmentioning

confidence: 78%

“…There were significant differences in the microbial community structure related to sand-batch (Section 3.1.2). It is therefore suggested that that the disparities in SHC were primarily related to biological clogging as previously described [24,[34][35].…”

Section: Hydraulic Propertiesmentioning

confidence: 90%

“…Where possible, organic molecules were quantified using relevant standard graphs prepared from HPLC chromatograms and identified by spiking selected samples with relevant standard solutions. The theoretical COD and actual COD values of the organic molecules were calculated and used for subsequent mass balance analysis and the compilation of metabolic profiles as previously described [24].…”

Section: Identification and Quantification Of Organic Substrate (Glucmentioning

confidence: 99%

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Minor differences in sand physicochemistry lead to major differences in bacterial community structure and function after exposure to synthetic acid mine drainage

Welz

Ramond

Cowan

et al. 2014

Biotechnol Bioproc E

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The formation of environmentally toxic acidic waste from mining activities is a world-wide problem. Neutralization of this waste can be accomplished by physicochemical and/or biological means. In this short-term study, synthetic acid mine drainage was added to sandfilled mesocosms containing silica-dominated (quartz) sand. Glucose was added as a carbon source for microbial iron and/or sulphate reduction. Replicates contained two separate batches of sand obtained from the same quarry site. The investigations used to assess and compare the chemical and biological functioning of the replicates included system hydraulic conductivity measurements, sand chemistry, effluent chemistry and bacterial community fingerprinting. Minor differences in composition of the sand, including the levels of available nutrients and micronutrients, resulted in major differences in measured parameters. 2 Significant differences in effluent chemistry were found in systems containing different batches of sand. It was demonstrated that the characteristics of the sand and the presence of acid mine drainage impacted the bacterial community structure and function. The importance of the physical substrate on the selection of functional microbial communities in systems remediating AMD should not be under-estimated. The physical substrate should be carefully selected and it may be prudent to include small-scale comparative studies in each particular setting prior to full-scale implementation.

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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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Ethanol degradation and the benefits of incremental priming in pilot-scale constructed wetlands

Cited by 20 publications

References 33 publications

Selection of Diazotrophic Bacterial Communities in Biological Sand Filter Mesocosms Used for the Treatment of Phenolic-Laden Wastewater

Selection of Diazotrophic Bacterial Communities in Biological Sand Filter Mesocosms Used for the Treatment of Phenolic-Laden Wastewater

Minor differences in sand physicochemistry lead to major differences in bacterial community structure and function after exposure to synthetic acid mine drainage

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

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