Retardation of ammonium and potassium transport through a contaminated sand and gravel aquifer: the role of cation exchange

Ceazan, Marnie L.; Thurman, E. Michael; Smith, Richard L.

doi:10.1021/es00069a012

Cited by 84 publications

(38 citation statements)

References 25 publications

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“…In these experiments native exchangeable Ca and Mg were desorbed from the sediment during sorption of leachate Na, NH 4 and K (Figures 2 and 4). Both NH 4 and K were most strongly sorbed by the sandstone, as observed in other studies (Kjeldsen and Christensen, 1984;Ceazan et al, 1989) and mass balances indicate that there is almost complete substitution of the native exchangeable cation population on the sediment during flushing with the M-phase leachate ( Table 3). The Ca and Mg mobilised during the A-phase leachate flush exceeded the amounts of NH 4 , K and Na sorbed, but was less than the total CEC of the column (Table 3).…”

Section: Attenuation Of Nhsupporting

confidence: 81%

Experimental and Modelling Approaches for the Assessment of Chemical Impacts of Leachate Migration from Landfills: A Case Study of a Site on the Triassic Sandstone Aquifer in the UK East Midlands

2005

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Current risk-based methods for assessing the effects of landfill leachate migration on groundwater resources are conservative and generalised. Cost-effective and practical strategies are required which can robustly determine the potential for contaminant attenuation on a site-specific basis. In this paper laboratory column experiments and reactive transport modelling are evaluated as a combined approach for assessing the chem'ical impact of leachate migration in the Triassic Sandstone aquifer. The results are compared with field data for a landfill in the East Midlands. Columns of aquifer sandstone were flushed sequentially with groundwater, followed by acetogenic or methanogenic leachate to simulate chemical interactions occurring during leachate loading episodes. The key contaminants in leachate (NH 4 , heavy metals, organic fractions) were attenuated by ion exchange, redox reactions, sorption and degradation. These processes produce a consistent hydrochemical signature which may help identify the extent of leachate migration in the aquifer. The laboratory results largely replicate those found in the field system, and the behaviour of inorganic contaminants during leachate flushing of the aquifer columns can be described by the reactive transport model. The experimental and modelling approach presented represents a powerful tool for risk assessment and prediction of leachate contaminant fate at unlined and lined landfills.

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Section: Attenuation Of Nhsupporting

confidence: 81%

Experimental and Modelling Approaches for the Assessment of Chemical Impacts of Leachate Migration from Landfills: A Case Study of a Site on the Triassic Sandstone Aquifer in the UK East Midlands

2005

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“…2B) (Jordan et al, 1997;Wilhelm et al, 1994). Substantial amounts of groundwater NH 4 are only observed in aquifers, where NH 4 -rich wastewater is directly released into the saturated, anoxic zone (Ceazan et al, 1989), or when significant organic matter decomposition occurs under anoxic conditions, e.g. in land-fill leachate plumes (Brun et al, 2002;Christensen et al, 2001) or in aquifers naturally rich in organic matter.…”

Section: Nitrogen and Phosphorus In Groundwatermentioning

confidence: 99%

“…In many aquifers, denitrification rates are electron-donor limited due to a lack of pyrite and labile organic C. Under those conditions, NO 3 is transported conservatively (Desimone and Howes, 1996;Weiskel and Howes, 1992;Wilhelm et al, 1994). Removal of NH 4 mainly occurs through sorption to clays (Ceazan et al, 1989).…”

Section: Nitrogen and Phosphorus In Groundwatermentioning

confidence: 99%

Nutrient inputs to the coastal ocean through submarine groundwater discharge: controls and potential impact

Slomp

Cappellen

2004

Journal of Hydrology

809

569

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Nutrient input through submarine groundwater discharge (SGD) rivals river inputs in certain regions and may play a significant role in nutrient cycling and primary productivity in the coastal ocean. In this paper, we review the key factors determining the fluxes of nitrogen (N) and phosphorus (P) associated with SGD and present a compilation of measured rates. We show that, in particular, the water residence time and the redox conditions in coastal aquifers and sediments determine fluxes and ratios of N and P in SGD. In many coastal groundwater systems, and especially in contaminated aquifers, N/P ratios exceed those in river water and are higher than the Redfield ratio. Thus, anthropogenically driven increases in SGD of nutrients have the potential to drive the N-limited coastal primary production to P-limitation. River input of N and P to the coastal ocean has doubled over the past 50 yr. Results of a dynamic biogeochemical model for the C, N and P cycles of the global proximal coastal ocean (which includes large bays, the open water part of estuaries, deltas, inland seas and salt marshes), suggest that this has led to a factor 2 increase in primary production and biomass and a decline in water column N/P ratios, i.e. the system has become more N-limiting. With the same model, we show that an increase of SGD-N fluxes to , 0.7-1.1 Tmol yr 21 (with a SGD N/P ratio of 100; equal to ,45 -70% of pre-human riverine N-inputs) is required to drive the coastal ocean to P-limitation within the next 50 yr. q

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“…Rapid and complete cation exchange of Na in the effluent resulted in high concentrations of Ca and Mg at the plume front (Wan et al, 2004a,b). The Na and K were being adsorbed by the pumiceous alluvium (Ceazan et al, 1989;Wan et al, 2004a). The Na and K concentrations in the groundwater are expected to increase significantly when the adsorption sites are saturated.…”

Section: Discussionmentioning

confidence: 99%

Initial stages of effluent plume development, Kinloch water treatment plant (WTP), Kinloch, Taupo, New Zealand

Dabell

Hendy

Hadfield³

et al. 2006

Journal of Geochemical Exploration

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Retardation of ammonium and potassium transport through a contaminated sand and gravel aquifer: the role of cation exchange

Cited by 84 publications

References 25 publications

Experimental and Modelling Approaches for the Assessment of Chemical Impacts of Leachate Migration from Landfills: A Case Study of a Site on the Triassic Sandstone Aquifer in the UK East Midlands

Experimental and Modelling Approaches for the Assessment of Chemical Impacts of Leachate Migration from Landfills: A Case Study of a Site on the Triassic Sandstone Aquifer in the UK East Midlands

Nutrient inputs to the coastal ocean through submarine groundwater discharge: controls and potential impact

Initial stages of effluent plume development, Kinloch water treatment plant (WTP), Kinloch, Taupo, New Zealand

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