Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Livestock manure"”.
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Removal of Estrogens at Full and Pilot Scale Livestock Manure Treatment Systems
… conducted to 1) develop appropriate methods for livestock manure estrogen analysis; 2) determine estrogen removal in different manure treatment systems; and 3) determine estrogen removal from dairy manure in pilot scale reactors. In Experiment I, the recoveries of 17Ã -estradiol (E2) and estriol …
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Release and Transport of Bacteria and Nutrients from Livestock Manure Applied to Pastureland
… indicators (VDEQ, 2002). Land applications of manure from confined animal systems and by direct deposit by grazing animals are both major sources of fecal bacteria and nutrients in runoff. Therefore, an understanding of the overland transport mechanisms for fecal bacteria and nutrients is very …
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Assessment of the potential contribution of biogas to mitigation of climate change in south africa
… municipal solid waste, municipal wastewater and livestock manure. The national picture of municipal waste was extrapolated from the waste data available in 7 metros in the country (City of Cape Town, Johannesburg, Tshwane, Ekurhuleni, EThekwini, Nelson Mandela Bay, and Buffalo City …
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A model for predicting bacteria concentrations in runoff from agricultural lands
… agricultural lands carrying microorganisms from livestock manure can contaminate the food and water supplies of both animals and humans. Planning and design of animal waste best management practices (BMPs) thus becomes more important as livestock populations become more concentrated. A computer …
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Viability of substitution of electricity with biogas for thermal uses at Neudamm campus of the University of Namibia
… campus's energy cost and the underutilisation of livestock manure as a renewable energy resource. A 100 L digester, constructed from locally available materials, was fed with a cow manure-water slurry and operated over a 60-day period. Key operational parameters included an estimated 30-day …
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Recovering biomethane from fats, oils, and greases: Examining the impacts of microbial ecology on anaerobic codigester stability and bioconversion kinetics
… density than wastewater treatment solids or livestock manure. Yet, biomethane recovery from FOG codigestion at wastewater treatment plants or agricultural digesters can be limited due to process inhibition caused by long-chain fatty acids (LCFA) accumulation. Currently, there is a lack of …
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Sorption Characteristics of Veterinary Ionophore Antibiotics Monensin and Lasalocid and Soil Clay Constituents Kaolinite, Illite and Montmorillonite
… for therapeutic and non-therapeutic treatment of livestock. Manure containing un-metabolized compounds is in turn used as beneficial amendment for agricultural crops, thus, these compounds may be available for transport through soils. These antibiotics have been detected in run-off, surface water, …
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Tracking Antibiotic Resistance throughout Agroecosystems
Widespread use of antibiotics in livestock production can result in the dissemination of bacteria carrying antibiotic resistance genes (ARGs) to the broader environment. Within agroecosystems, ARGs can pose a risk to livestock handlers, farmers, and ultimately consumers. The overall goals of this …
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Optimisation of use of waste materials by Rhodopseudomonas palustris
… glycerol and urea (a nitrogenous waste from e.g. livestock manure slurries). This thesis first reports on the evolutionary history of an alternative cyanophycin producing enzyme, CphA2 (distinct from the widely studied CphA1). Phylogenetic analysis reveals for the first time that CphA2 is found …
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Effectof feed rations on livestock performance and impact of effective microorganisms on litter odour and other gases emissions.
… was to evaluate the effect of feed rations on livestock (cattle and swine) performance and the impact of effective microorganisms(EM) on litter type odour and other gaseous emissions. It was hypothesized that diet type and EM would not livestock litter odour and gaseous emissions. Experimental …
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Improving Watershed Models to Achieve a Better Prediction of Water Quantity and Quality
… model responses; 3) accurate representation of manure operation in watershed models. This dissertation addresses each of the aforementioned challenges using new approaches and tools in three studies with the main objective of achieving a better prediction of water quality and quantity and …
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Characterizing the fate and transport of chemicals of emerging concern (CECs) from swine manure during waste to energy processes
Animal manure and domestic wastewater contain chemicals of emerging concern (CECs) that can threaten ecosystems and human health. For instance, estrone (E1) and 17β-estradiol (E2) can disrupt the reproductive biology of vertebrates at very low concentrations. This study investigates the effects of …
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Assessing Vulnerabilities to the Spread of Pathogens and Antibiotic Resistance in Agricultural and Water Systems Using Culture-, Molecular-, and Metagenomic-based Techniques
… (wastewater-derived biosolids and cattle-derived manure), water reuse, and drinking water systems disrupted by a major hurricane. A field study was carried out to survey a suite of pathogens from source-to tap in six small drinking water systems in Puerto Rico six months after Hurricane Maria. The …