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Showing 1 to 20 of 43 for “"dairy manure"”.
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Enhanced Biological Phosphorus Removal for Liquid Dairy Manure
… have examined the application of EBPR to treat dairy manure. This study was conducted to evaluate the (i) performance of pilot-scale EBPR systems treating liquid dairy manure, to balance the ratio of nitrogen to phosphorus in manure to meet crop nutrient requirements, (ii) effects of dissolved …
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Dairy Manure Flushwater Treatment by Packed-Bed Anaerobic Digesters
… walnut shell medium was researched for treating dairy freestall barn flushwater. Reciprocation mixing was evaluated as a means to lessen channelization in the media bed and to improve biogas production and organic matter removal at ambient temperatures. Reciprocation has been used in biological …
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Mineralization of Nitrogen in Liquid Dairy Manure During Storage
Loss of nitrogen (N) from dairy manure during storage is an issue of economic, environmental, and social concern for farming communities. The lost N 1) decreases the value of manure as a fertilizer and is an economic loss because supplemental inorganic N fertilizer is purchased to meet N needs on …
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Nitrogen dynamics and biological response to dairy manure application
Animal manures are land applied in agronomic systems to supply essential crop nutrients and decrease dependency on chemical fertilizers. Liquid manures are traditionally surface broadcast to fields and sometimes incorporated to reduce odor and nutrient losses; however, incorporation is incompatible …
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Nitrogen Removal From Dairy Manure Wastewater Using Sequencing Batch Reactors
… of this research was to characterize a flushed dairy manure wastewater and to develop the kinetic and stoichiometric parameters associated with nitrogen removal from the wastewater, as well as to demonstrate experimental and simulated nitrogen removal from the wastewater. The characterization …
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Investigating pretreatment methods for struvite precipitation in liquid dairy manure
… methods to enhance struvite precipitation in dairy manure. Generally there are two challenges that need to be overcome to precipitate struvite in liquid dairy manure. The first is the relatively high calcium (Ca) concentration. The present study investigated the effectiveness of two calcium …
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Composted dairy manure and arbuscular mycorrhizae influence on weed competition and potato yield
Potatoes are an important global food crop typically produced in high-input systems in temperate zones. Growers that have access to compost may use it to improve soil health and increase tuber yields, but compost may also impact microbial communities, weed competition, weed seed fecundity, …
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Enhanced Biological Phosphorus Removal from Dairy Manure to Meet Nitrogen:Phosphorus Crop Nutrient Requirements
… farms. This has led to greater amounts of excess manure nutrients on farms, increasing the potential for nutrient pollution of water bodies from runoff. The purpose of this study was to determine if enhanced biological phosphorus removal (EBPR) is a viable alternative for managing excess manure …
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Conservation of Nitrogen via Nitrification and Chemical Phosphorus Removal for Liquid Dairy Manure
… to conserve nitrogen (N) via nitrification in dairy manure, (2) determine the effect of recycled flush water on the bio-availability of N during nitrification, and (3) determine effective and economical dosages of chemicals to remove phosphorus (P) from liquid dairy manure. Intermittent …
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Application of Hydrothermal Carbonization, Membrane Distillation, and Algae Cultivation for Sustainable Dairy Manure Treatment
Dairy production has grown more efficient as the number of cows on each facility increases; however, this expansion has also increased the concentration of localized manure that can lead to environmental concerns such as greenhouse gas emissions or eutrophication. This dissertation investigates a …
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Compartmental Process-based Model for Estimating Ammonia Emission from Stored Scraped Liquid Dairy Manure
… and emission of ammonia from stored liquid dairy manure are governed by environmental factors (e.g. manure temperature, moisture) and manure characteristics (e.g. total ammoniacal nitrogen concentration, pH). These environmental factors and manure characteristics vary spatially as a result …
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Microwave-based Pretreatment, Pathogen Fate and Microbial Population in a Dairy Manure Treatment System
… precipitation are two effective ways of treating dairy manure for recovering biogas and phosphorus. Anaerobic digestion of dairy manure is commonly limited by slow fiber degradation, while one of the limitations to struvite precipitation is the availability of orthophosphate. The aim of this work …
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Comparison of Dairy Manure Anaerobic Digestion Performance in Gas-lift and Bubble Column Digesters
… one of the most promising management options for dairy manure treatment. Manure wastewater from dairy farms has been used for methane production for decades. However, performance failure due to inadequate mixing is routine. In general, the mixng of anaerobic digester is achived throguh mechnical …
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Ammonia Emissions from Dairy Manure Storage Tanks Affected by Diets and Manure Removal Practices
… emission rates from stored scraped and flushed manure from dairy cows fed either normal or low N diet; and 2) seasonal effects on ammonia emission rates from stored scraped and flushed dairy manure. Four pilot-scale tanks were used for manure storage with different treatments - scraped manure …
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Optimization of Biological Nitrogen Removal From Fermented Dairy Manure Using Low Levels of Dissolved Oxygen
… ammonia nitrogen (TAN) from solids-separated dairy manure. An anaerobic fermenter, upstream of the N removal reactor, produced volatile fatty acids (VFAs), to be used as an electron donor to fuel denitrification, and TAN at a COD:N ratio of 18:1. However, sufficient amounts of non-VFA COD was …
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Nitrogen values of liquid dairy manure and dry broiler litter as affected by preservation treatment
Five liquid dairy manures and five dry broiler litters were tested in the laboratory to determine the effects of four preservation techniques on the forms and concentrations of nitrogen. 300 ml samples of fresh manure from five Virginia dairy and five poultry farms were analyzed for total Kjeldahl, …
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Microbiome Metabolism in the Rumen of Bovine Grazing Toxic Tall Fescue and in Stored Dairy Manure
… pathways mediating nitrogen loss in two dairy manure storage systems, the clay-lined Earthen Pit (EP) and aboveground concrete storage tank (CS) on two commercial dairy farms, to develop strategies to minimize these losses. We first developed a catalog of the archaea and bacteria that …
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The Effect of Thermophilic Anaerobic Digestion on Ceftiofur and Antibiotic Resistant Gene Concentrations in Dairy Manure
… antibiotic class used to treat mastitis in dairy cows and can retain most of their bioactivity after excretion. Ceftiofur is a commonly used cephalosporin drug but no previous study investigating the effect of Ceftiofur on biomethane during continuous anaerobic digestion has been performed. …
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Integrating Machine Learning Into Process-Based Modeling to Predict Ammonia Losses From Stored Liquid Dairy Manure
Storing manure on dairy farms is essential for maximizing its fertilizer value, reducing management costs, and minimizing potential environmental pollution challenges. However, ammonia loss through volatilization during storage remains a challenge. Quantifying these losses is necessary to inform …
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