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 “"algal productivity"”.
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Geographical assessment of algal productivity and water intensity across the United States
Water consumption due to evaporation in open algal cultivation systems represents a significant research gap in the resource assessment literature. Existing algal evaporation models often lack high spatiotemporal resolution or are not validated with experimental systems. This study presents a …
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Individual And Population Responses Of The Caribbean Sponge, Aplysina Cauliformis, To Natural And Anthropogenic Stressors
… undergone a phase shift from coral-dominated to algal-dominated ecosystems, and in many cases other functional groups such as sponges are now the predominant organisms on many reefs. This dissertation investigated the responses of a combranching sponge, Aplysina cauliformis, to algal contact, …
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Enhancing CO2 mass transfer in algal raceway ponds through wave generation
… ponds. These ponds however suffer from low algal productivities compared to closed photobioreactors, in part due to inadequate CO2 mass transfer into the culture. A previous study at the University of Cape Town explored a method to improve the transfer of atmospheric CO2 into the pond …
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Effects of Light and Macroinvertebrate Consumers on Detrital Microbial Biofilms in Streams
… light or darkness. I measured litter-associated algal, fungal and bacterial biomasses and production rates, as well as litter decomposition, over 49 days. Both experiments exhibited significant positive effects of light on algal productivity and interactions of <em>Macrobrachium </em>and …
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Enhancing CO2 mass transfer in large scale algal raceway ponds through wave generation
… a linear growth rate, also described as biomass productivity, determined by the mass transfer rate. This reduces the specific growth rate of the system, as the culture cannot achieve the maximum growth rate limiting the productivity of systems. A novel system for enhancing CO2 mass transfer using …
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The Use of Algal Assays to Evaluate Algal Biomass in Regulated Streams
… This study was undertaken to evaluate the algalgrowth potential of the Des Moines River as it passes through Saylorville and Red Rock Reservoirs. Procedure. The test organism, "Selenastrum capricornutum" Printz, was grown in an algal assay which used various additions of nutrient spikes to …
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Investigating Ammonium Toxicity In The Performance Of Recirculating Periphytic Algal Wastewater Treatment Systems
… inexpensive biological methods (for example, algal treatment systems) have therefore been developed for the removal of excess nutrients from wastewater. By design, secondary waste treatment facilities (WWTF) remove organics and solids and lower oxygen demanding substances; however, they may …
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Algal Wastewater Treatment and Biofuel Production: An assessment of measurement methods, and impact of nutrient availability and species composition
… ecosystems.</p> <p>Maximizing the benefits of algal wastewater treatment and biofuel production will require optimizing total nutrient removal, biomass production, and lipid content of the biomass; a complicated problem given that many algal species known for high nutrient removal and lipid …
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Mixing, mass transfer and energy analysis across bioreactor types in microalgal cultivation and lipid production
… Photobioreactors, closed vessels for microalgal cultivation, are known to have high energy consumption due to mixing and aeration. Sparging is commonly used for mixing and gas-liquid mass transfer in photobioreactors, but is energy intensive. The aim of this work was to reduce these energy …
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Marine microbial production of dimethylsulfide from dissolved dimethylsulfoniopropionate
… of DMS concentrations with indicators of algal productivity on a local scale is poor. This thesis focuses on an alternative pathway of DMS formation: microbial cleavage of dissolved (extracellular) DMSP. In laboratory studies, bacteria able to cleave DMSP to form DMS were isolated from …
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Water and Nutrient Recycling in High Rate Algae Ponds Fed in Primary Treated Municipal Wastewater
<p>Algal biofuels present a promising future alternative to petroleum based fuels. Water nutrient recycling is a key step to increase the sustainability of algae biofuel production facilities. This thesis discusses the process of nutrient and water recycling in high rate algae raceway ponds (HRAP) …
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Biofuels from Liquefaction of Marine Microalgae: Production, Upgrading, and Environmental Impacts
Algal biomass is an attractive source for liquid fuel production as it grows rapidly even in adverse conditions, and fixes carbon dioxide from the atmosphere by photosynthesis. Hydrothermal liquefaction (HTL) of microalgae is a promising conversion technology in which algal biomass is treated as an …
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The dynamics of ¹³C in several New Zealand lakes
… production in fresh water lakes varies with productivity and trophic state. (ii) Determine if such variations can be used for the investigation of lake palaeoenvironment. (iii) Quantify the effect of anthropogenic activity on the productivity of Hamilton Basin lakes. The viability of this …