Passive dosing of organic substrates for nitrate-removing bioreactors applied in field margins
| Autor: | Sheila Ball, Roelof Stuurman, Wim J. Chardon, Joachim Rozemeijer, Stefan Jansen, Jan Gerritse |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Denitrification Hydraulic retention time 010501 environmental sciences Management Monitoring Policy and Law Waste Disposal Fluid 01 natural sciences Non-Point Source Pollution chemistry.chemical_compound Denitrifying bacteria Bioreactors Nitrate Bioreactor Life Science Water Pollutants Organic matter Duurzaam Bodemgebruik Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology chemistry.chemical_classification Sustainable Soil Use Nitrates technology industry and agriculture 04 agricultural and veterinary sciences Pulp and paper industry Pollution chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Woodchips Waste disposal |
| Zdroj: | Journal of Environmental Quality, 48(2), 394-402 Journal of Environmental Quality 48 (2019) 2 |
| ISSN: | 0047-2425 |
| Popis: | Denitrifying bioreactors are dependent on organic matter supply as a substrate for effective NO 3 removal. In this study, the difference in removal efficiency and side effects when using different organic matter sources and dosing strategies was tested in two field experiments. The organic matter sources tested were woodchips and ethanol. The effect of woodchips was tested using woodchip-enveloped drains. Ethanol was supplied to a flow-through reactor by passive dosing by diffusion through silicone tubing. The woodchip-enveloped drains showed a removal efficiency of 80% during the first year of application, but this rate decreased during the second and third years of application, coinciding with a decrease in dissolved organic C and an increase in redox potential. The removal efficiency was higher and remained higher over a longer period of time when the drains were installed more deeply. The flow-through reactor with ethanol could lead to a higher removal efficiency (up to 95%) at higher hydraulic retention time (HRT, 0.1 d) than the woodchip-enveloped drains (HRT = 5 d). Passive dosing of organic substrates is simple, needs little maintenance and no energy, and can be performed independent of electricity. A denitrifying bioreactor with a controlled drainage inlet and outlet is a promising setup for optimizing N removal and minimizing side effects. |
| Databáze: | OpenAIRE |
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