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.
Results
Showing 1 to 12 of 12 for “"Oxygen Transfer Rate"”.
-
An analysis of microbial film fermentor system for production of secondary metabolites
… since less inhibitory effect of the substrate is pronounced in that configuration. Optimum biofilm thickness for the fermenter system was found to be a function of various operating parameters, and should be determined from information on the interactions between fermenter productivity and …
-
Biological conversion of alkanes to dicarboxylic acids : an investigation into process challenges and optimisation in hydrocarbon-based bioprocesses
… challenges related to the nature of the substrate. Many of these challenges are common to all hydrocarbon fermentations, regardless of the product formed, and include flammability, volatility and inhibition of cell growth (notably at low carbon chain lengths), insolubility (notably at high …
-
Oxidative stress and nitrosative stress, their interaction and implications for bioprocessing
… 75% lower in all polymyxin B processes. Varying oxygen transfer rate (OTR), by changing the stirring rate, in the lag phase of a batch fermentation, utilising the Aspergillus niger B1-D strain, results in increased oxidative stress with increased stirring rates. The resulting lysozyme production …
-
Microscale controlled continuous cell culture
… of metabolic and cellular activity through substrate and product interactions are highly dependent on environmental conditions and cellular metabolic state. For such experiments to be feasible, continuous cultures are utilized to ensure consistent conditions. However, since medium must be …
-
Predicting Oxygen Transfer in Hypolimnetic Oxygenation Devices
… predict the performance of several hypolimnetic oxygenators. The model is used to predict the oxygen transfer rate in a hypolimnetic oxygenator based on the initial bubble size formed at the diffuser. The discrete-bubble model is based on fundamental principles, and therefore could also be …
-
Enhanced Microbial Activity and Energy Conservation through Pneumatic Mixing in Sludge Systems
… low pressure air diffusers in two types of aerated systems (activated sludge and aerobic sludge digestion) and to decrease overall energy consumption. Aerated treatment systems are very important in the treatment of wastewaters and management of sludges. The activated sludge process is widely …
-
Shotgun metagenomics exploration of fermented food microbiomes
… The chapter also highlights the role food substrate plays in determining the microbial composition of these foods. Chapters 3 & 4 investigate kombucha specifically, a fermented beverage that has enjoyed a massive growth in commercial value over recent years. These chapters also combine targeted …
-
The Utilization of Low-grade Carbohydrates
… of useful materials from a class of carbohydrate resources presently under-utilized and even wasted. The use of both carbohydrate-containing crops and processing wastes as fermentation substrates was extensively reviewed. It was concluded that a simple cheap fermentation process for the …
-
Balancing ammonia and alkalinity for nitrification at Walnut Creek Wastewater Treatment Plant
… source was CaCO₃ solids, which are generated by the lime-softening process at Davis Water Treatment Plant. In 2011, the utility began transferring solids to Walnut Creek and immediately noticed improvements in both the nitrification efficiency and the effluent pH. However, undissolved …
-
Scale-Up the Use of a Microbubble Dispersion to Increase Oxygen Transfer in Aerobic Fermentation of Baker's Yeast
A microbubble dispersion (MBD) was used to supply oxygen for an aerobic fermentation of Baker's yeast. The 1-liter microbubble dispersion generator supplied bubbles for 20-liter and 50-liter working volume fermentations in a 72-liter pilot scale fermenter. The microbubbles were stabilized by the …
-
The effect of aeration and aerator design on the physical, chemical and fertiliser quality of cattle slurry
… pollution and crop scorching are no longer tolerated by the general public and government pollution agencies. To alleviate some of the problems faced by farmers storing large quantities of slurry, aerobic treatment systems have been devised that can reduce the risk of pollution. Slurry aeration …
-
Investigating red pigment production by Penicillium purpurogenum DSM 62866
… maintained through the application of a 50 mM citrate buffer. The pH, growth and pigment production trends were consistent upon scaling up the cultivation from 100 mL shake flask to 5 L bioreactor scale. The volumetric biomass concentration achieved under these base case conditions in the …