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Feasibility of two low-cost organic substrates for inducing denitrification in artificial recharge ponds: Batch and flow-through experiments

Grau-Martínez, Alba ; Torrentó, Clara ; Carrey, Raúl ; Rodríguez-Escales, Paula ; Domènech, Cristina ; Ghiglieri, Giorgio ; Soler, Albert ; Otero, Neus

Journal of contaminant hydrology, 2017-03, Vol.198, p.48-58 [Periódico revisado por pares]

Netherlands: Elsevier B.V

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Título:
Feasibility of two low-cost organic substrates for inducing denitrification in artificial recharge ponds: Batch and flow-through experiments
Autor: Grau-Martínez, Alba ; Torrentó, Clara ; Carrey, Raúl ; Rodríguez-Escales, Paula ; Domènech, Cristina ; Ghiglieri, Giorgio ; Soler, Albert ; Otero, Neus
Assuntos: Algeria ; Ammonium Compounds - metabolism ; Aqüífers ; Arecaceae - chemistry ; Chemical Fractionation ; Denitrification ; Enginyeria civil ; Enginyeria química ; Environmental Monitoring ; Flow-through experiments ; Geologia ; Geoquímica ; Groundwater - analysis ; Groundwater recharge ; Hidrologia subterrània ; Monitored artificial recharge ; Nitrates - metabolism ; Nitrogen Isotopes - analysis ; Organic substrate ; Oxidation-Reduction ; Oxygen Isotopes - analysis ; Permeable reactive barrier ; Plant Leaves - chemistry ; Ponds ; Química del medi ambient ; Semi-arid region ; Spain ; Sulfates - metabolism ; Water Pollutants, Chemical - metabolism ; Water Purification - instrumentation ; Water Purification - methods ; Àrees temàtiques de la UPC
É parte de: Journal of contaminant hydrology, 2017-03, Vol.198, p.48-58
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SourceType-Scholarly Journals-1
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Descrição: Anaerobic batch and flow-through experiments were performed to assess the capacity of two organic substrates to promote denitrification of nitrate-contaminated groundwater within managed artificial recharge systems (MAR) in arid or semi-arid regions. Denitrification in MAR systems can be achieved through artificial recharge ponds coupled with a permeable reactive barrier in the form of a reactive organic layer. In arid or semi-arid regions, short-term efficient organic substrates are required due to the short recharge periods. We examined the effectiveness of two low-cost, easily available and easily handled organic substrates, commercial plant-based compost and crushed palm tree leaves, to determine the feasibility of using them in these systems. Chemical and multi-isotopic monitoring (δ15NNO3, δ18ONO3, δ34SSO4, δ18OSO4) of the laboratory experiments confirmed that both organic substrates induced denitrification. Complete nitrate removal was achieved in all the experiments with a slight transient nitrite accumulation. In the flow-through experiments, ammonium release was observed at the beginning of both experiments and lasted longer for the experiment with palm tree leaves. Isotopic characterisation of the released ammonium suggested ammonium leaching from both organic substrates at the beginning of the experiments and pointed to ammonium production by DNRA for the palm tree leaves experiment, which would only account for a maximum of 15% of the nitrate attenuation. Sulphate reduction was achieved in both column experiments. The amount of organic carbon consumed during denitrification and sulphate reduction was 0.8‰ of the total organic carbon present in commercial compost and 4.4% for the palm tree leaves. The N and O isotopic fractionation values obtained (εN and εO) were −10.4‰ and −9.0‰ for the commercial compost (combining data from both batch and column experiments), and −9.9‰ and −8.6‰ for the palm tree column, respectively. Both materials showed a satisfactory capacity for denitrification, but the palm tree leaves gave a higher denitrification rate and yield (amount of nitrate consumed per amount of available C) than commercial compost [Display omitted] •Palm tree leaves and commercial compost have proved to be suitable for inducing denitrification.•Higher denitrification rates were obtained using palm tree leaves.•Dissimilatory nitrate reduction to ammonia has been observed.•N and O isotope fractionation during induced denitrification was determined.
Editor: Netherlands: Elsevier B.V
Idioma: Inglês

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Feasibility of two low-cost organic substrates for inducing denitrification in artificial recharge ponds: Batch and flow-through experiments

Grau-Martínez, Alba ; Torrentó, Clara ; Carrey, Raúl ; Rodríguez-Escales, Paula ; Domènech, Cristina ; Ghiglieri, Giorgio ; Soler, Albert ; Otero, Neus

Netherlands: Elsevier B.V

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