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Showing 1 to 20 of 92 for “"Denitrifying"”.
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Environmental tradeoffs of denitrifying woodchip bioreactors
The development of row cropped agriculture on hydrologically altered landscapes in the Midwestern United States has led to environmental concerns. Tile drainage in this region acts as a conduit carrying sediment, nutrients, and other environmental pollutants to surface waters. Propelled by these …
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Microbial community analysis for denitrifying biofilters
Denitrifying biofilters are a promising and low-maintenance technology for removing nitrate from agricultural drainage, capable of removing 50-80% of annual nitrate loads. Because increased riverine nitrate concentrations are correlated with indicators of eutrophy and degradation of coastal waters, …
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Anaerobic transformations of Kepone by denitrifying bacteria
… The most extensive degradation was produced by denitrifying bacteria grown on benzoate-nitrate medium. In enrichment cultures, Kepone was transformed more extensively than by pure cultures isolated from the enrichments. A gram negative-faculative rod, called K bacterium, transformed 8.8% of the …
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Biological transformation of 2,4-dinitrotoluene under denitrifying conditions
… of 2,4-dinitrotoluene (DNT) was evaluated. Two denitrifying enrichment cultures were developed, one with inoculum from the biological treatment plant at Radford Army Ammunition Plant (RAAP), which was acclimated to treatment of DNT munitions wastes, the other derived from an activated sludge not …
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Hydraulic evaluation of a denitrifying bioreactor with baffles
Denitrifying ‘woodchip’ bioreactors are an effective conservation practice to reduce nitrate-nitrogen (NO3-N) loss from tile drained agricultural areas. They enhance the naturally occurring denitrification process via the addition of woodchips and maintenance of anoxic conditions. Bioreactors tend …
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Microbial community dynamics in denitrifying biofilters receiving agricultural drainage
… of nitrate entering surface waters is the denitrifying biofilter. A typical denitrifying biofilter consists of a woodchip-filled trench inline with the drainage tile; woodchips provide a carbon substrate to the microorganisms that convert nitrate to nitrogen gas through the denitrification …
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Greenhouse Gas Production and Nutrient Reductions in Denitrifying Bioreactors
… promising avenue to reduce excess nitrogen, and denitrifying bioreactors (DNBRs) are an emerging technology harnessing this biochemical process. Previous DNBR research has established successful nitrate removal, whereas this study examines the potential to expand DNBR functionality to address …
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Dissolved phosphorus removal in denitrifying bioreactors: field and laboratory studies
Denitrifying woodchip bioreactors are an edge of the field conservation practice designed to remove nitrate (N) from subsurface agricultural drainage water. However, phosphorus (P) removal has been observed in bioreactors across Illinois. Both N and P play an important role in eutrophication and …
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Challenges and Opportunities for Denitrifying Bioreactors in the Mid-Atlantic
… over the last several decades have produced denitrifying bioreactors that harness the ability of ubiquitous soil microorganisms to convert bioavailable N into inert N gas, thereby removing bioavailable N from an ecosystem. Denitrifying bioreactors are edge-of-field structures that consist of …
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Carbon dosing of denitrifying bioreactors to remove nitrate from agricultural drainage
Several studies have demonstrated that denitrifying woodchips bioreactors effectively remove nitrate from a broad spectrum of wastewater. Even though bioreactors have a comparatively small spatial footprint and are straightforward to construct, the low long-term nitrate removal efficiency they …
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Microbial contaminant removal and alternative nitrogen removal pathways in denitrifying bioreactors
Denitrifying bioreactors, simple treatment systems consisting of a container filled with a particulate organic carbon source, are an effective and low-cost technology for the effective removal of nitrogen (N) from water by enhancing denitrification (i.e. the bacterial conversion of nitrate [NO3-] …
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Microbial Dynamics and Mechanistic Insights into a Hydrogenotrophic Denitrifying Microbial Consortium
… microbial interactions within hydrogenotrophic denitrifying consortia on these behaviors has yet to be substantially discussed in the literature. Therefore, this study used a co-culture consortium containing a Paracoccus strain and a Thauera strain to address some of the aforementioned …
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Denitrifying woodchip bioreactors for aquaculture manifold design and potential water reuse
… nitrate reduction technology. Early studies on denitrifying woodchip bioreactors, a biological nitrate-remediation system, have demonstrated their potential for RAS wastewater treatment. Bioreactors are highly effective at nitrate removal via the process of denitrification but have also …
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Biogeochemistry of denitrifying bioreactors to enhance phosphorus removal from agricultural subsurface drainage
… minimize nutrient pollution in surface waters. Denitrifying bioreactors (DBRs) are a prominent edge-of-field treatment technology to mitigate surface water nitrate loadings from agricultural subsurface drainage. Recent studies have identified that subsurface drainage can also contribute to the …
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Effect of passive and active heating on the performance of denitrifying bioreactors
… solutions to mitigate these problems. The use of denitrifying bioreactors is a management practice developed to reduce nitrate pollution from agricultural fields with subsurface drainage. Denitrifying bioreactors are woodchip filled trenches that provide the necessary energy source to allow for …
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METABOLIC SHIFT AND NICHE DIFFERENTIATION DURING DENITRIFYING PHOSPHORUS REMOVAL IN A TROPICAL CLIMATE
… between long-term nitrite- and nitrate-mediated denitrifying phosphorus removal processes. Nitrite as terminal electron acceptors inhibited growth of GAOs. Finally, the denitrification abilities and N2O reduction capability of Accumulibacter was characterized and contrasted with Competibacter and …
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Structural and Functional Microbial Ecology of Denitrifying Bacteria Using Different Organic Carbon Sources
… the link between the structure and function of denitrifying microbial populations grown on different carbon sources. Specific objectives were to: 1) diagnose bacteria specifically assimilating methanol and ethanol and determine denitrification kinetics induced by the two carbon sources; 2) …
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Development and application of a microbial reliability model to analyze denitrifying biofilter stability
… One proven method is the use of edge-of-field denitrifying biofilters. These biofilters redirect tile drainage flow through a woodchip bed, where microbial activity converts influent nitrate to nitrogen gases. As with many engineered ecosystems, performance stability of the biofilters is of …
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Improving performance and expanding application of denitrifying bioreactors for nutrient management in agricultural landscapes
… and human health. To address these challenges, denitrifying bioreactors have been developed as an edge-of-field conservation practice to intercept tile drainage and promote microbial denitrification within a carbon-rich, anoxic environment. Optimizing the design and performance of these systems …
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