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 20 of 21 for “"maximum specific growth rate"”.
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Dissolution and Biokinetics of PCL in Denitrification Systems
… a modified Noyes-Whitney model, which was calibrated to capture the kinetics and predict carbon release over time. Many previous studies have overlooked the dissolution step, potentially leading to misinterpretations of rate limitation as low biological activity. Complementary biological …
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Biological Conversion Process of Methane into Methanol Using Mixed Culture Methanotrophic Bacteria Enriched from Activated Sludge System
… resulted in a notable enhancement of the growth kinetics. The attained maximum specific growth rate (max) (0.358 hr-1) and maximum specific methane biodegradation rate (qmax) (0.605 g-CH4,Total/g-DCW/hr-1) were the highest reported in mixed cultures. Furthermore, the maximum methanol …
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An evaluation of carbon monoxide and methane as substrates for the denitrification of water
This study involved the use of soil and suspended growth microcosms to study the variation in groundwater denitrification rates using different substrates. Two gaseous substrates, carbon monoxide and methane, were studied and compared to a common liquid substrate, methanol. Denitrification with …
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Determination of Biodegradation Kinetics of Select Pharmaceuticals and Personal Care Products in an Activated Sludge System through Respirometry
… acclimated to relatively high doses of PPCP substrates, those being greater than 100 μg/L. A series of tests were conducted using each substrate during the testing period. The kinetic parameters: yield (Y), half saturation coefficient (Ks), maximum specific growth rate (um), and maximum specific …
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Metabolic and Kinetic impacts of the auxiliary energy source in model chemolithoheterotrophic Bacteria
… gradient. This results in higher overall growth yields and maximum specific growth rates as the organism does not need to generate as many reducing equivalents to fuel the respiratory chain and can instead <br/>redirect that material into anabolic reactions to generate more biomass. Many …
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Deammonification Process Kinetics and Inhibition Evaluation
… digested solids. This liquid, also knows as centrate, reject water or sludge liquor, can cause an increase of up to 25% in ammonia loading. The recently discovered anaerobic ammonia oxidation (anammox) process is a major breakthrough for treatment of these streams as it has the potential to …
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Enhanced Biological Phosphorus Removal from Dairy Manure to Meet Nitrogen:Phosphorus Crop Nutrient Requirements
… livestock operations have become highly concentrated due to growing trends towards larger, more confined facilities and a decrease in cropland on smaller farms. This has led to greater amounts of excess manure nutrients on farms, increasing the potential for nutrient pollution of water bodies …
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The competitive dynamics of toxic and non-toxic ribotypes of the harmful dinoflagellate Alexandrium tamarense in Scottish waters
… Group I and Group III ribotypes was clear, with growth rates, maximum cell densities and total toxicity per cell showing marked changes compared to monocultures. Both strains showed a preference for the intermediate temperatures of 15 and 18 °C. Yet despite this, strain differences did occur. The …
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Optimization of Biological Nitrogen Removal From Fermented Dairy Manure Using Low Levels of Dissolved Oxygen
… (N) removal system was constructed and operated for approximately 365 days and was designed to remove inorganic total 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 …
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Mixotrophic Production of Omega-3 Fatty Acid-rich Alga Phaeodactylum tricornutum on Biodiesel-derived Crude Glycerol
… acid (EPA) producing diatom. Mixotrophic growth is when cells perform autotrophic and heterotrophic modes of growth concurrently. EPA is an omega-3 polyunsaturated fatty acid that has been demonstrated to have a multitude of beneficial health effects, including maintaining human …
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Evaluation of Nitrification Inhibition Using Bench-Scale Rate Measurements, Profile Sampling, and Process Simulation Modeling
The Hampton Roads Sanitation District (HRSD) operates thirteen treatment plants in the eastern Virginia area with a combined capacity of 231 million gallons per day (mgd). The Nansemond Treatment Plant (NTP) is one of the larger facilities, and is designed to treat 30 mgd using a 3-stage Virginia …
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Producing Omega-3 Polyunsaturated Fatty Acids from Biodiesel Waste Glycerol by Microalgae Fermentation
… use of crude glycerol as a less expensive substrate for the fermentation of the microalgae <i>Schizochytrium limacinum</i> and <i>Pythium irregulare</i> which are prolific producers of omega-3 polyunsaturated fatty acids. Omega-3 fatty acids have many beneficially effects on treating human …
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The application of algal growth potential techniques to surfactant and zinc toxicity studies
… undertaken to evaluate the suitability of algal growth potential techniques for testing the toxic effects of surfactants and zinc to an algal test organism. The algal growth potential techniques used included both static and continuous-flow algal bioassay procedures. The algal test organism …
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Manganese dioxide reduction kinetics by Geobacter sulfurreducens and associated biofilm morphology in a flow-through reactor
… metal reducing bacteria (DMRBs) are a specific type of bacteria that convert metals to lower redox states through oxidation and reduction reactions. They utilize more metal than is needed for biosynthesis because they can conserve energy through the reduction of metals. This ability of …
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Low strength wastewater treatment using emerging anaerobic treatment processes
… Roles of half saturation constant (Ks) and maximum specific growth rate (umax) in anaerobic treatment systems, however, are often overlooked. This study proposed to apply specific affinity (defined as umax/ Ks) as the key performance indicator of anaerobic processes treating low-strength …
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Developments in anaerobic digestion modelling
… failure, anaerobic digesters are frequently operated far below their optimal level. In order to run a digester closer to capacity, a better understanding of AD failure is required. Under conditions approaching failure, or during startup, intermediate products such as acetate, propionate and …
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Development of a mathematical model for predicting bio-slurry temperature and subsequent gas production rate for underground brick-built biogas digester using ambient air temperature forecast
… technology for biogas production as a strategy to enhance energy supply and poverty eradication in rural communities. Underground, brick, and mortar built fixed dome type digesters are the most deployed small-scale biogas technology in sub-Saharan Africa (SSA) countries such as Rwanda, …
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Comparing the Metcalf and Eddy and UCT steady state guidelines for sizing of biological nutrient removal activated sludge wastewater treatment plants
… of the anoxic reactor to achieve a certain nitrate removal. The key findings are: (1) Both UCT and M&E guidelines close the COD and N flux balances within 1%. (2) For organics removal only, at the same SRT, sludge production and oxygen demand are about 5% higher and lower respectively for the …
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The development of a mathematical model for the bioextraction of the critical raw material magnesium from mine waste using acidithiobacillus caldus
… kinetics, combined with the extracted microbial growth kinetics for Acidithiobacillus (At.) caldus, formed the basis of the bioleaching model. Both batch and continuous flow reactor systems were investigated for their suitability and performance in magnesium recovery. The system was optimised …
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A Comparison of Wastewater Process Modelling Tools: Case Study of Potsdam WWTW
… characterisation of the influent wastewater and specific wastewater parameters are critical input parameters to the mathematical model, whether for design, optimisation or to measure the expected performance of a wastewater treatment works (WWTW). A wastewater treatment process is inherently …
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