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 23 for “"vacuum filtration"”.
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Deposition Thickness Modeling and Parameter Identification for Spray Assisted Vacuum Filtration Process in Additive Manufacturing
… of filter cakes created through a spray assisted vacuum filtration is presented in this paper, to enable the development of advanced thickness controllers. The mass transfer dynamics in the spray atomization and vacuum filtration are studied for the mass of solid particles and mass of water in …
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The effect of certain sludge floc properties on the dewatering characteristics of biological and chemical waste sludges
… to dewatering studies using laboratory-scale vacuum filtration, sanbed, and filter press equipment. The experimental results showed clearly that particle size distribution was a key parameter for describing the response of sludges to each of the dewatering methods utilized. For biological …
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Principles and techniques for conditioning of waste-activated sludge by direct slurry freezing
… by settling, and by filter cake quality when vacuum filtration and gravity drainage on sand beds were utilized. The sludge samples for the principal part of the investigation were obtained from three different sources: two extended aeration plants treating domestic sewage and a conventional …
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The role of floc density measurements in analyzing sludge dewatering characteristics
… tests: gravity thickening, centrifugation, vacuum filtration, and high-pressure dewatering. Each sludge was analyzed for changing macro- and micro-properties during increasing stages of dewatering. It was concluded that sludge thickening rates are influenced by aggregate volume fractions, …
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Hydrogen storage in pt/carbon nanotube sheets
… prepared as substrates by ambient environment vacuum filtration of suspensions of the nanotubes. To enhance hydrogen storage on the CNTs, platinum particles were deposited on the three types of CNT sheets using two processes: electrodeposition (ED) using a DC power source and electrochemical …
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Fine Coal Dewatering
… reagents on fine coal dewatering, laboratory vacuum filtration and centrifugation tests were conducted. The utilization of the novel dewatering aids in the dewatering systems decreased the final moisture contents of the filter cakes to sufficiently low values. There was approximately 50% …
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Development of a Flow Cytometry Method for the Identification and Enumeration of Enterococcus faecalis
… as an alternative to the traditional membrane filtration method. The developed method was used to characterize <em>E. faecalis </em>during batch growth and yielded consistent results across the various physiological states of the cells. Additionally, the application of propidium iodide (i.e., a …
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Floc density measurement and the effects of microproperty variations on sludge dewatering characteristics
… tests: gravity thickening, centrifugation, and vacuum filtration. Each sludge was analyzed for macro- and micro properties through each stage of dewatering. It was concluded that improvements in thickening and dewatering characteristics were heavily dependent upon increases in sludge floc …
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Electrical properties of various single-wall carbon nanotube networks
… and their SWCNT precursors were fabricated by vacuum filtration. In addition to these networks, networks of non covalent ly functionalised SWCNTs were built up using layer-bylayer (LbL) deposition. This second approach required the wrapping up of SWCNTs by ionic surfactants to exploit their …
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Electrostatically Actuated Microvalves Fabricated with Soft-Lithographic Techniques for Integrated Microfluidics
… printing of nanoparticle films formed by vacuum filtration. The latter was used to integrate the conducting membranes into a fabrication process for microvalves, which included the incorporation of membrane support structures. The fabrication process was optimized by exploring the design …
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Bioinspired scattering materials: light transport in anisotropic, disordered systems
… phase separation and a combination of sequential vacuum filtration and freeze-drying — were investigated. Notably, the reported materials achieve scattering properties comparable to those found in nature, showcasing the potential of using biopolymers to produce sustainable, biocompatible white …
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Barium carbonate treatment of sulfuric acid wastewater
… The sludge was dewatered efficiently by both vacuum filtration and gravity drainage. Optimum sulfate removal was accomplished by the second method which consisted of adding barium carbonate to the wastewater after neutralization with high calcium hydrated lime. Only the theoretical amount of …
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An evaluation of separation methods for the selective coagulation of ultrafine coal
… lamella thickening, centrifugal sedimentation, vacuum filtration, drum screening, and froth flotation. Each separation method was optimized using statistically-designed test matrices to determined the best separation method based on overall process performance. The thickener was found to be the …
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An evaluation of a heat syneresis process on domestic U.S. sewage sludges
… measured by both filter leaf and specific filtration resistance tests. The primary sludge exhibited a marked improvement in filterability when held at a temperature of 170 to 185 °C for 20 minutes or more. The 1:1 mixture of primary and activated sludges showed this excellent dewaterability …
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Inkjet Printing of 2d Materials on Flexible and Rigid Substrates
… exfoliated h-BN flakes are further collected via vacuum filtration and redispersed into 1-butanol/poly(4-vinylphenol) (PVPh) to formulated h-BN inks. I demonstrate that all these inks have optimal fluidic properties, drying dynamics and interactions with substrates for spatially uniform, highly …
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Physical properties of chemically conditioned sludges
… to dewatering studies using laboratory-scale vacuum filtration equipment and sand drying beds. This study indicated that the best conditioner for activated sludge is ferric chloride. Addition of ten percent ferric chloride (on dry solids basis) enhanced the dewatering process and slightly …
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Preliminary investigation of growth and antimicrobial production by streptomyces polyantibioticus : from shake flask to stirred tank bioreactor
… measurement of whole shake flasks following vacuum filtration, as it best suited the non-homogenous filamentous nature of SPRT.
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Evaluation of Novel Fine Coal Dewatering Aids
… tests using a 2.5-inch diameter Buchner vacuum filter. The results showed that the use of the novel dewatering aids can reduce the cake moisture up to 50% over what can be achieved without using any dewatering aid. The use of the dewatering aids also increased the kinetics of dewatering …
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Functionalized Single Walled Carbon Nanotube/Polymer Nanocomposite Membranes for Gas Separation and Desalination
… were fabricated by orienting the SWNTs by high vacuum filtration. The orientation of SWNTs on top of the porous support was sealed by UV polymerization. For making these membranes, the CNTs were purified and cut into small open tubes simultaneously functionalizing them with COOH groups. Gas …
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Functionalized carbon nanotube thin-film nanocomposite membranes for water desalination applications
… CNTs were oriented on a membrane support by high vacuum filtration. These oriented CNTs were sealed by a polyamide film via interfacial polymerization. Cross-sectional image of the nanocomposite membrane taken by scanning electron microscopy (SEM) showed semi-aligned zwitterion-CNTs on top of a …
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