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 18 of 18 for “"aerating"”.
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Energy Conservation By Intermittently Recirculating and Aerating an Aquaponics System with an Airlift
<p>An airlift device providing aeration and circulation was designed to reduce electrical power requirements for aquaponics by eliminating the need for a water pump. The airlift performed better than predicted and achieved water flow rates of 10 L/min at 25 °C, in comparison to the theoretical …
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The development of methods and equipment for the study of the aerating capabilities of a microdispersion of air in water
Increased production of petroleum based products to keep pace with technological advances has taken its toll on the environment. Hydrocarbon contamination of the subsoil and groundwater has become a major problem facing scientists and environmentalists in the 20th century. Initial treatment of …
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Eisenia hortensis Detects Chemesthetic Irritants through TRP Channels
… inhabit. Through their movement, they assist in aerating the soil as well as increasing soil permeability to water which can increase plant growth. Despite their importance to agriculture, little is known about earthworm chemesthesis i.e., the detection of chemical irritants. Based on a …
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Design of an electronically-actuated gas lift safety valve
… the production tubing, to sustain production by aerating the oil and lifting it to the ground or sea surface. Today's industry standard, a pressure-actuated valve, is susceptible to various modes of failure, including corrosion and jamming. Safety mechanisms are needed to seal the valve in case …
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The System of Rice Intensification (SRI): Complicating the global narrative
… irrigating intermittently and consistently aerating the soil, SRI promises to increase global rice production to twice the 3.7 t/ha currently experienced (Uphoff, 2003). Notwithstanding regional variance (Uphoff, 2003) and contestation of the results (Sheehy et al., 2005), SRI advocates in …
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Wastewater Carbon Diversion and Recovery via Primary Sludge Production, Thermal Hydrolysis, and Anaerobic Digestion
… of bench-scale aeration studies indicated that aerating the sludge in holding tanks reduced peak emission concentrations of sulfurous odorous compounds. Further full-scale validation confirmed that aeration can be used by utilities as a simple means for biosolids odor control.
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Density, Shell Use and Species Composition of Juvenile Fiddler Crabs (Uca Spp.) at Low and High Impact Salt Marshes on Georgia Barrier Islands
… crab densities. Fiddler crabs are important in aerating the soil, soil drainage, and decomposition rates. A change in fiddler crab densities and behavior can have an adverse affect to the salt marsh and could lead to the loss of an important ecosystem.
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Evaluating the feasibility of using screw conveyors as a means to continuously grow black soldier fly larvae
… were also done on the effectiveness of mixing in aerating the substrate and allowing BSF larvae to live deeper. This involved filling a tube with substrate and BSF larvae to various depth between 15 and 45 cm and measuring oxygen levels at the bottom depth. The tube was also flipped to simulate …
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Studies of Bitumen Aeration
… industry, bitumen is separated from sands by aerating the heavy oil so that it can float out of a flotation vessel, leaving the unaerated sands behind. A bubble-against-plate apparatus equipped with a high-speed camera has been developed to record the optical interference patterns of the …
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The purification of semi-chemical pulping waste by aeration
… 3591 p.p.m. The investigation was carried out by aerating the waste with and without the addition of chemical oxidizing agents and biological seeds. The results of this investigation show that the 5-day B.O.D. of semi-chemical kraft pulping waste was lowered from 24 to 31 percent by forty-eight …
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Vegetation response of a Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis) community to 6 mechanical treatments in Rich County, Utah
… chaining, 1-way and 2-way pipe harrowing, and aerating in the fall and spring reduced sagebrush cover from greater than 20% to less than 5% and reduced density by about half. Two years after mechanical treatment surviving sagebrush had greater leader and seed stalk growth than untreated …
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Scale prevention in sea water evaporators Part II: decarbonation-filtration treatment
… at this temperature for at least 30 minutes and aerating the feed using compressed air. After about 50 percent of the carbon dioxide has been removed, the feed becomes saturated with magnesium hydroxide. The precipitate can be removed from the feed water by filtration, and the high alkalinity of …
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Biological Aerated Filters: Oxygen Transfer and Possible Biological Enhancement
… determined that (assuming OTE equals 20 percent) aerating the BAF pilot unit based on the stoichiometric aeration demand resulted in overaeration of the unit, especially at lower pollutant loading rates. Endogenous respiration contributed to only 2 to 7 percent of the total oxygen demand with …
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The influence of land management on upland water quality, notably the production of soluble colour in supply
… are linked to reductions in soil moisture, aerating soil conditions and in turn increasing levels of organic acids through decomposition. Liming increases p H and leads to increased decomposition,albeit by a slightly different set of processes, but has the same result. Several research sites …
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Soap based thermal insulation as an environmental alternative to petroleum based thermal insulation
… idea of combining basic soap ingredients, then aerating the mixture to create thermal insulation is new and as such contributes to new knowledge. The publishing of a journal paper titled “Can Soap be a Sustainable Alternative to Petroleum-Based Thermal Insulation?” in the journal of Structural …
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Scale prevention in sea water evaporators. Part III. Decarbonation, filtration, and acidification
… at this condition for a period of time, and then aerating the water with compressed air. This step removes part of the carbonates present, but in the process magnesium hydroxide is precipitated. The second step, the removal of the precipitated magnesium hydroxide, is accomplished by filtering the …
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Understanding and optimisation of non-conventional emulsions
… will be determined. The materials formed upon aerating these samples will also be described in terms of the wettability of the particles in situ. Again the result will indicate that diol increase the inherent hydrophilicity of the system and therefore change the materials formed upon …
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The role of domestic ducks in the maintenance and spread of avian influenza viruses in Indonesia
… fields by fertilizing the field with feces and aerating the field by swimming and walking through the ground cover. Additionally, the ducks serve as a form of insect control through their natural grazing behaviors. The role that domestic ducks play in the ecology of influenza viruses is poorly …