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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 20 of 105 for “"volatile fatty acids"”.
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Improved Polyhydroxyalkanoate Production from Selected Volatile Fatty Acids using Cupriavidus necator
… methods to improve PHA production from selected volatile fatty acids (VFAs) and to improve the understanding of the PHA production process by pure culture bacterial fermentation using Cupriavidus necator. Optimisation strategies involved the following investigations using shake flasks and 5 litre …
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Exploring volatile fatty acids (VFAs) as a novel substrate for microbial oil production
… on feedstock cost and availability. As such, volatile fatty acids (VFAs) can play an important role in advancing sustainable biofuel production since they can be derived from low cost feedstock including gases and municipal solid waste. To this end, we studied fermentations of the oleaginous …
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EVALUATION OF A METHOD TO MEASURE VOLATILE FATTY ACIDS AND GASES IN VITRO WITH MATHEMATICAL MODELING
… emissions are stoichiometrically linked with volatile fatty acid (VFA) profiles in ruminant animals. For example, a shift from acetate to propionate may decrease carbon dioxide (CO2) and hydrogen (H2) production, and in turn, decrease conversion of CO2 and H2 to methane. In vitro methods have …
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Integrated anaerobic digestion and electrodialysis process model for enhanced volatile fatty acids recovery from thin stillage
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-05-01
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Effect of particle size, heating and pelleting of rations on volatile fatty acids production in the rumen of lambs
Call number: LD2668 .T4 1963 A59
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Application of physicochemical and biological pretreatments to enhance volatile fatty acids production via Dark Fermentation from agri-food waste
… for conventional ones. In this regard, Volatile Fatty Acids (VFAs) constitute the so-called carboxylate platform, which plays a central role in biorefinery processes. The benchmark bioprocess for VFA production is Dark Fermentation (DF), a mode of anaerobic digestion in which the …
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Implementation of Acid/Gas Digestion Approach to Maximize Volatile Fatty Acids Production from Municipal Sludge and a Techno-economic Feasibility Study
… conditions that would maximize the production of volatile fatty acids (VFAs). Batch and semi-continuous acid digesters were operated using combined primary sludge and waste-activated sludge as the feedstock from New York City (NYC)’s Wards Island water resource recovery facility (WRRF). Operating …
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Biological Evaluation of Purified Diets for Lambs With Emphasis on the Utilization of Certain Dietary Components as Affected by Branched-Chain Volatile Fatty Acids
Made available in DSpace on 2014-12-09T14:28:50Z (GMT). No. of bitstreams: 1 6511758.pdf: 1928857 bytes, checksum: f521834c9aeffb1bcf17884e5e076d23 (MD5) Previous issue date: 1965
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Rumen Microbial Protein Synthesis in Cows Fed Dried Whey
… Butyrate (16.5 and 24.4 moles/100 moles total volatile fatty acids) was higher while propionate was lower (32.4 and 23.2 moles/100 moles total volatile fatty acids) when fed dried whey; concentrations of other volatile fatty acids were similar with both diets. Bacterial synthesis appeared to be …
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Intake, growth and rate of digesta passage in ruminating calves fed sodium bicarbonate and disodium phosphate
… for determination of pH, buffering capacity, volatile fatty acids anct ruminal ammonia and blood samples for determination of glucose and plasma urea nitrogen at 8, 11 and 14 wk. Rate of passage was determined using ytterbium and cobalt EDTA to follow the particulate and liquid phases of …
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Monitoring the Stability of Anaerobic Digestion Using a Novel On-line Bicarbonate Alkalinity Monitor
… system, the phosphate, ammonia, sulphides and volatile fatty acids systems are present in anaerobic process. These systems can exert a significant influence on the accuracy of bicarbonate titration's to a set pH.An overload of 4.7 to 13.6 kgCODm-3d-1 1 administered to a 5m3 pilot scale …
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Intake and Digestibility of Brown-Midrib Corn Silage by Lactating Dairy Cows
… for cows fed the bm3 ration. Total ruminal volatile fatty acids, pH, and ammoniacal nitrogen levels were similar. In trial 2, five cows per group were individually fed a ration of either ~ 3 or normal silage supplemented with a concentrate at an 85:15 silage to concentrate ratio (dry matter …
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Measuring and Developing a Control Strategy for Odorous Gases from Solids Handling Processes of a Large Wastewater Treatment Plant
… fiber for the analysis of predetermined volatile fatty acids. Calibration curves were developed within the ranges 0.0004 and 2.9943 ppmv for sulfides and 0.0228 and 2.3309 ppmv for fatty acids and showed R2 greater than 0.99 . A one year study of the odorants and operation parameters was …
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Effect of liquid waste addition on the overall performance of anaerobic bioreactor landfill
… higher concentration resulted in accumulation of volatile fatty acids and strong inhibition. The surfactant waste added at concentrations up to 1500 mg/L showed some inhibition but the overall performance was good. The surfactant waste also appeared to improve lignin degradation.
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The nutritional characteristics and requirements of a butyrivibrio
… and because of its production of certain volatile fatty acids in a rumen fluid-glucose medium fermentation. The characteristic fermentation waa the production of a large amount of butyric acid and 1ome lactic acid or succinic acid, and the lack of production of propionic acid. It was found …
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The development of a kinetic model for biological sulphate reduction with primary sewage sludge as substrate
… systems. The products of these processes, the Volatile Fatty Acids (VFA) then enter into the methanogenic or sulphate reduction processes, which operate in competition. The end product of sulphate reduction is sulphide, which is inhibitory to the methanogens, and this inhibition would have to …
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Utilização da torta de algodão na alimentação de caprinos mestiços boer em terminação
… of the carcass and meat, production of volatile fatty acids and rumen morphometry Boer crossbred goats fed cottonseed meai finishing. The experiment was conducted at the Experimental Farm of São Gonçalo dos Campos, belonging to the School of Veterinary Medicine and Zootecnia, December …
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Defining giftedness: an ethnographic approach
… and because of its production of certain volatile fatty acids in a rumen fluid-glucose medium fermentation. The characteristic fermentation waa the production of a large amount of butyric acid and some lactic acid or succinic acid, and the lack of production of propionic acid. It was found …
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The effect of influent organic compounds on the performance of biological nutrient removal systems
… for orthophosphate, nitrate, nitrite, sulfate, volatile fatty acids, COD, MLVSS, pH and metals. All added substrates, except formic acid and dextrose, caused significant increases in phosphorus release in the anaerobic stage, and phosphorus uptake, in the aerobic stage, and consequently, an …
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Effect of sugar waste, surfactant waste and paint waste on the degradation of anaerobic bioreactor landfill components
… due to a drop in pH and accumulation of volatile fatty acids. Reactors with surfactant concentrations ranging from 50 mg/L to 500 mg/L showed that a higher concentration of 500 mg/L or above may be inhibitive in nature and the inhibition increases with increase in the concentration of …
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