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

Healy, Mark G.; Barrett, Maria; Lanigan, Gary; Serrenho, Ana; Ibrahim, Tristan G.; Thornton, Steven F.; Rolfe, Stephen A.; Huang, Weichen; Fenton, Owen

doi:10.1016/j.ecoleng.2014.10.005

Cited by 47 publications

(39 citation statements)

References 36 publications

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“…These results, combined with the knowledge gained from previous research on enhanced microbial reduction of NO 3 − using woodchip as an orgC source in bioreactors (e.g. Healy et al 2012Healy et al , 2014, suggest that combining woodchip and zeolite or pea gravel in a single water treatment unit could allow for simultaneous remediation of NO 3 − , NH 4 + and DRP. Sakadevan and Bavor (1998) calculated a q max of 2.15 mg/g for zeolite in wastewater, compared to 18.3 mg/g (as DRP) in the current study.…”

Section: Permeable Reactive Interceptor Setup and Operationsupporting

confidence: 57%

“…The results of the pre-washing phase in the current study and those of Healy et al (2012Healy et al ( , 2014 show that pre-washing the woodchip is an efficient means to Fig. 6 Post-spiking inlet and outlet solute concentrations from 13th August (13-08) to 7th September (07-09).…”

Section: Future Researchmentioning

confidence: 78%

“…This relates to the efficacy of woodchip to enhance denitrification, as shown by Healy et al (2012Healy et al ( , 2014. Nitrate removals in other studies typically exhibit high removal rates.…”

Section: Overall Pri Hydrochemical Performancementioning

confidence: 94%

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Mixed Agricultural Pollutant Mitigation Using Woodchip/Pea Gravel and Woodchip/Zeolite Permeable Reactive Interceptors

Ibrahim

Goutelle

Healy

et al. 2015

Water Air Soil Pollut

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Dairy soiled water (DSW) is water from concreted areas, hard stand areas and holding areas for livestock that has become contaminated by livestock faeces or urine, chemical fertilisers and parlour washings. Losses of DSW occur as point (e.g. storage, pivot irrigators) and diffuse losses (e.g. during or shortly after land application). The concept of a permeable reactive interceptor (PRI), comprising a denitrifying bioreactor woodchip cell to convert nitrate (NO 3 − ) to dinitrogen (N 2 ) gas and an adsorptive media cell for phosphorus (P) and ammonium (NH 4 + ) mitigation, attempts to simultaneously treat mixed pollutants. This study is the first attempt to test this concept at laboratory-scale. Washing of woodchip media prior to PRI operation produced low NO 3 − but high NH 4 + , dissolved reactive P (DRP) and dissolved organic carbon losses. Dairy soiled water was then treated in replicated PRIs containing woodchip in combination with zeolite or gravel compartments. In general, all PRIs were highly efficient at reducing NO 3 − , NH 4 + , DRP, dissolved unreactive phosphorus (DUP) and dissolved organic nitrogen (DON) from an influent water replicating DSW. Longitudinal and hydrochemical PRI profiles, as well as zeolite batch experiments, showed that woodchip can both enhance NO 3 − reduction and adsorb nutrients. Since woodchip is likely to become saturated, it is important to place the reactive media cell further into the sequence of treatment. Even though the majority of the dissolved nutrients were mitigated, the PRIs also emitted greenhouse gases, which would need further remediation sequences.

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Section: Permeable Reactive Interceptor Setup and Operationsupporting

confidence: 57%

Section: Future Researchmentioning

confidence: 78%

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Mixed Agricultural Pollutant Mitigation Using Woodchip/Pea Gravel and Woodchip/Zeolite Permeable Reactive Interceptors

Ibrahim

Goutelle

Healy

et al. 2015

Water Air Soil Pollut

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“…Some studies have calculated nitrate removal rate using the total bed volume that includes the unsaturated woodchip volume (Schipper et al, 2010a;Warneke et al, 2011aWarneke et al, , 2011bChristianson et al, 2013b). Others have used the saturated woodchip volume but without porosity consideration (Cameron and Schipper, 2010;Warneke et al, 2011c;Healy et al, 2015). In contrast, Healy et al (2012) calculated nitrate removal rate of a woodchip column using the same method presented in our study.…”

Section: Nitrate Removal Rate Lawmentioning

confidence: 84%

Modeling nitrate removal in a denitrification bed

2015

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

Cited by 47 publications

References 36 publications

Mixed Agricultural Pollutant Mitigation Using Woodchip/Pea Gravel and Woodchip/Zeolite Permeable Reactive Interceptors

Mixed Agricultural Pollutant Mitigation Using Woodchip/Pea Gravel and Woodchip/Zeolite Permeable Reactive Interceptors

Modeling nitrate removal in a denitrification bed

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

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