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Showing 1 to 19 of 19 for “"woodchips"”.
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Range of and relationships between physical and hydraulic properties of commonly available denitrifying bioreactor woodchips
… Ksat and drainable porosity for a subset of woodchips to values closer to current practice standards (2.07 to 7.44 cm s-1 and 41 to 55%, respectively). Drainable porosity (permeameter method) and hand-measured woodchip median width were the only significant predictors of Ksat in a multiple …
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Examination of synergism in nitrate and orthophosphate removal in bioreactors
… constructed using the iron-based material and woodchips as reactor media. Synergism was displayed as a result of alternating media arrangement with the observation of 25% higher reduction in nitrate-N concentrations, on average, as a result of interaction with woodchips when woodchips were …
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Biotic and Abiotic Remediation of Acetaminophen with Woodchip and Biochar-amended Woodchip Adsorbents
… biotic transformation and uptake potential of woodchips and biochar-amended woodchips as a potential sorbent strategy for diffuse acetaminophen (ACT) pollution. Batch reactions were created in triplicate, supplied with 5 mM ACT, and analyzed over an eight hr period using ultraviolet …
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Impact of Biochar Amendment, Hydraulic Retention Time, and Influent Concentration on N and P Removal in Horizontal Flow-Through Bioreactors
… DNBR columns. Three media types were tested: woodchips (W), 90% woodchips and 10% biochar (B10), and 70% woodchips and 30% biochar (B30). Simulated agricultural drainage with four unique concentration combinations of 16.1 and 4.5 mg L-1 NO3--N and 1.9 and 0.6 mg L-1 PO43--P was delivered at …
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Dissolved phosphorus removal in denitrifying bioreactors: field and laboratory studies
… wood types in the batch tests except for the woodchips sourced from the field bioreactor installation. These field woodchips exhibited continual P removal over 72 h which was thought to be more likely related to microbial removal than chemical P sorption. Microbial removal was further …
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Design and evaluation of a biosecure composting system to dispose of swine mortalities during a foreign animal disease outbreak
… Two cover materials (ground cornstalks and woodchips) were tested using actively and passively aerated composting sheds. The mortalities were inoculated with Salmonella spp. and vaccine strains of Bovine Herpesvirus-1 (BHV-1) and Bovine Viral Diarrhea Virus (BVDV). Air samples collected from …
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Impedance-based moisture content sensor assessment for gas-phase biofilters
A woodchips-based gas-phase biofilter is capable of mitigating airborne ammonia efficiently. The moisture content (MC) of the biofilter media is important to determine ammonia mitigation and nitrous oxide generation. It is critical to monitor real-time moisture content of the biofilter media for …
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Municipal yard waste composting: process parameters, windrow gases, and leachate quality
… Mixes of 3 parts leaves/1 part grass, 2 parts woodchips/1 part grass, and leaves alone were composted in windrows. Process control was by a front-end loader/back-hoe according to a 60°C maximum temperature set-point, initially, and by temperature plateaus or moisture conditions following most …
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Biogeochemistry of denitrifying bioreactors to enhance phosphorus removal from agricultural subsurface drainage
… alone. However, it is inevitable that woodchips alone do not abiotically remove phosphorus due to the incompatibility between the surface charge of wood at neutral-to-acidic pH values. In this study, raw pinus radiata, and, thermally modified pyrolyzed woodchips were employed for …
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Environmental tradeoffs of denitrifying woodchip bioreactors
… BR1. This represents 7.7% of total C lost from woodchips. At this rate, the carbon in the bioreactor would be depleted in 13 years. During 2013, BR2 emitted 1.0 kgN2O-Nm-2. Average N2O-N flux during the study period was 0.5mgN2O-Nm-2 hr-1. In 2013, 9.3 kgN2O-N was emitted from BR2. Average CH4-C …
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Mechanism of virus removal and nutrient reduction and modification of bio-sand filter
… inches PVC, packed with different proportions of woodchips and sand, and fed with high nitrate concentration (50 mg/L). The proportions of sand and woodchip were different such as 50% of woodchip and sand (filter B), 70% of woodchip and 30% of sand (filter A), and 100% woodchip and 5cm sand layer …
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A Mesocosm Study of Bioretention Functionality Under Frozen Conditions
… well as an experimental mixture of clay loam and woodchips. Simulated spring melt events were conducted at the end of March 2021 and March 2022, with an additional event included at the beginning of March 2022 to observe the influence of midwinter melts on bioretention performance. Datasets were …
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Predicting storage vessel geometry requirements for discharge of extreme shape materials
… 1989; McGee Eddie, 2009). Examples of ESM are woodchips, miscanthus (elephant grass), shredded paper, municipal solid wastes, industrial and commercial wastes, corn stover, straw, lawn grass, chicken/poultry litter, etc. Most conversion (process) technologies like pyrolysis, gasification, …
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Hydraulic evaluation of a denitrifying bioreactor with baffles
… denitrification process via the addition of woodchips and maintenance of anoxic conditions. Bioreactors tend to be one of the most cost-effective options for treatment of tile drainage NO3-N, but considering the scale of water quality goals, new approaches to bioreactors are needed to provide …
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Organic amendment effects on carbon and nitrogen mineralization in an Appalachian minesoil
… a Jefferson series topsoil, 8 cm of whole-tree woodchips, and an unamended control) were assigned to lysimeters filled with blasted overburden. All lysimeters were planted with a treecompatible ground cover of grasses and legumes and 10 pitch pine x loblolly pine hybrid seedlings (Pinus rigida …
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Gas-phase biofiltration for livestock building ammonia emission mitigation
… into nitrite and nitrate using microorganisms. Woodchips and composts are often used as packing materials thus making it an affordable method. It was originally developed in Germany to treat odors in the 1950s and later became popular in both the United States and the Europe. Most previous …
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Microbial community dynamics in denitrifying biofilters receiving agricultural drainage
… trench inline with the drainage tile; woodchips provide a carbon substrate to the microorganisms that convert nitrate to nitrogen gas through the denitrification pathway. Research to date has focused on applying traditional engineering approaches to improve biofilter performance and …
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Microbial community analysis for denitrifying biofilters
… media and in biofilter water, and that washing woodchips in buffer solution was able to remove cells for further study. Sample preparation methodology for use with FISH was developed using vortexing of samples with glass beads to aid in removing cells from woodchip debris. Community fingerprint …
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Carbon dosing of denitrifying bioreactors to remove nitrate from agricultural drainage
… 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 …