Nitrate removal rate, efficiency and pollution swapping potential of different organic carbon media in laboratory denitrification bioreactors

Healy, Mark G.; Ibrahim, Tristan G.; Lanigan, Gary; Serrenho, Ana; Fenton, Owen

doi:10.1016/j.ecoleng.2011.12.010

Cited by 132 publications

(118 citation statements)

References 43 publications

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“…well drained and high permeability) to 61 years (e.g. moderately drained and low permeability) (Fenton et al, 2011) which may also include losses of other greenhouse gases (GHGs) such as methane 77 (CH 4 ) and carbon dioxide (CO 2 ), as well as NH 4 + , phosphorus (P), organic C and 78 metals, is referred to as 'pollution swapping' (Fenton et al, 2014 The laboratory bioreactors of Healy et al (2012) were used in the current study. 123…”

mentioning

confidence: 99%

“…The LPW and cardboard bioreactors were operated to 131 determine their long-term performance. In the Healy et al (2012) In the current study, the bioreactors were operated at incrementally increasing HLRs 136 of 5 and 10 cm d -1 (Table 1) and the influent NO 3 --N concentration was varied from 137 20 to 29.6 mg L -1 over both loading rates. A conservative tracer (NaBr, 10 g L -1 , 138 applied in one pulse in one constant hydraulic loading interval) was used to estimate 139 the average HRT within each bioreactor, at each HLR, after Levenspiel (1999).…”

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confidence: 99%

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Optimizing nitrate removal and evaluating pollution swapping trade-offs from laboratory denitrification bioreactors

Healy

Barrett

Lanigan

et al. 2015

Ecological Engineering

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confidence: 99%

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confidence: 99%

Optimizing nitrate removal and evaluating pollution swapping trade-offs from laboratory denitrification bioreactors

Healy

Barrett

Lanigan

et al. 2015

Ecological Engineering

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“…In this regard, measurement of spatial and temporal variations (seasonal and diurnal) of GHG emissions is necessary to accurately estimate CW-derived GHG emissions. A holistic assessment of ecologically engineered systems has been outlined by Healy et al (2011Healy et al ( , 2014 and developed further by . Such assessments can be applied in evaluating nutrient dynamics in CWs.…”

Section: And N Dynamics and Greenhouse Gas Emissionsmentioning

confidence: 99%

Carbon and nitrogen dynamics and greenhouse gas emissions in constructed wetlands treating wastewater: a review

Jahangir

Richards

Healy

et al. 2016

Hydrol. Earth Syst. Sci.

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Abstract. The removal efficiency of carbon (C) and nitrogen (N) in constructed wetlands (CWs) is very inconsistent and frequently does not reveal whether the removal processes are due to physical attenuation or whether the different species have been transformed to other reactive forms. Previous research on nutrient removal in CWs did not consider the dynamics of pollution swapping (the increase of one pollutant as a result of a measure introduced to reduce a different pollutant) driven by transformational processes within and around the system. This paper aims to address this knowledge gap by reviewing the biogeochemical dynamics and fate of C and N in CWs and their potential impact on the environment, and by presenting novel ways in which these knowledge gaps may be eliminated. 4 emissions. Mixed species of vegetation perform better than monocultures in increasing C and N removal and decreasing greenhouse gas (GHG) emissions, but empirical evidence is still scarce. Lower hydraulic loadings with higher hydraulic retention times enhance nutrient removal, but more empirical evidence is required to determine an optimum design. A conceptual model highlighting the current state of knowledge is presented and experimental work that should be undertaken to address knowledge gaps across CWs, vegetation and wastewater types, hydraulic loading rates and regimes, and retention times, is suggested. We recommend that further research on process-based C and N removal and on the balancing of end products into reactive and benign forms is critical to the assessment of the environmental performance of CWs.

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“…Organic substrates such as woodchips which were light and easily available have been hotly studied over recent years (Chun et al, 2010;Cameron and Schipper, 2012). However, the impact of the release of nitrogen and organic matters is still questionable (Healy et al, 2012).…”

Section: Introduction 1)mentioning

confidence: 99%

Nitrogen Removal in Column Wetlands Packed with Synthetic Fiber Treating Piggery Stormwater

Cheng¹,

Kim²

2016

Journal of Wetlands Research

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prevention of piggery stormwater is of vital difficulty due to the dispersibility and uncertainty of the occurrence and the pollution source. Piggery stormwater has attracted more and more attention, since it contains high concentration of nutrients (e.g. nitrogen, phosphorus and organic matters), toxic substances (e.g. ammonia, nitrate and toxic organics) and risky pathogens and bacterial. It pollutes rivers and seas (Al-Hafedh et al., 2003;Mearns et al., 2013) AbstractA set of lab-scale polymer synthetic fiber packed column wetlands composing three columns (CW1, CW2 and CW3) with different hydraulic regimes, recirculation frequencies and pollutant loading rates, were operated in 2012. Synthetic fiber tested as an alternative wetland medium for soil mixture or gravel which has been widely used, has very high pore size and volume, so that clogging opportunity can be greatly avoided. The inflow to the wetland was artificial stormwater. All the wetlands achieved effective removal of TSS (94%~96%), TCOD (68%~73%), TN (35%~58%), TKN (62%~73%) and NH 4 -N (85%~ 99%). Particularly, it was observed that COD was released from the fiber during one distinct period in all wetlands. This was probably due to the degradation of polymer fiber, and the released organic matters were found to serve as carbon source for denitrification. In addition, with longer retention time and frequent recirculation, lower effluent concentration was observed. With higher pollutant loading rate, higher nitrification and denitrification rates were achieved. However, although organic matters were released from the fiber, the lack of carbon source was still the limiting factor for the system since the release persisted only for 40 days.

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Nitrate removal rate, efficiency and pollution swapping potential of different organic carbon media in laboratory denitrification bioreactors

Cited by 132 publications

References 43 publications

Optimizing nitrate removal and evaluating pollution swapping trade-offs from laboratory denitrification bioreactors

Optimizing nitrate removal and evaluating pollution swapping trade-offs from laboratory denitrification bioreactors

Carbon and nitrogen dynamics and greenhouse gas emissions in constructed wetlands treating wastewater: a review

Nitrogen Removal in Column Wetlands Packed with Synthetic Fiber Treating Piggery Stormwater

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