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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

A two dimensional study of a louvre type dust separator

Matheson, James Carl 12 1900 (has links)
No description available.

Efficiency of fog-type dust collectors at low dust loadings

Kernan, Charles Reynolds 08 1900 (has links)
No description available.

Absolute efficiency of electrostatic precipitation for collection of siliceous dust

Wilson, Earl Chastain 12 1900 (has links)
No description available.

The mechanism of separation in the louver type dust separator

Smith, Joseph Leconte 12 1900 (has links)
No description available.

A study of the effect of different concentrations of air borne dust on the efficiency of a model precipitron

Smith, Harry Beaman 12 1900 (has links)
No description available.

Effect of blade design in the louver type dust separator

Ogle, Joseph Alva 08 1900 (has links)
No description available.

An initial study of a louvre type dust separator

Harwell, Charles William 12 1900 (has links)
No description available.

Variables affecting the performance of a fog-type dust collector

Brian, Ben Frank 12 1900 (has links)
No description available.

Factors affecting the efficiency of a wet type dust collector

Stewart, Robert Earl January 1963 (has links)
Performance tests on a wet type dust collector were made using four different test dusts to determine a relationship between dust collection efficiency, particle size and size-distribution., collector nozzle velocity, and collector geometry. Dust laden air entered the collector and impinged upon a water surface at nozzle velocities in the order of 10,000 fpm. The fraction of dust which penetrated the collector was found to fit the equation [formula omitted] π = collector penetration (100% minus efficiency) ø[subscript]g = Geometric Coefficient of Variation of the test dust [formula omitted] V = collector nozzle velocity in thousands of fpm j = [formula omitted] π was found to vary from 0.121 percent with Corundum dust to 8.68 percent with Alundum dust. The nozzle velocity range was from6840 fpm to 14,130 fpm and the range of J was from 6.85 to 27.4. Corundum dust was found to have a value of ø[subscript]g equal to 0.123 with a geometric mean diamter, [formula omitted] , of 11.9 microns while ø[subscript]g and [formula omitted] for Alundum were calculated to be 0.521 and 4.84 microns respectively. The four test dusts were sized by a sedimentation method. The Function equation fits the experimental results with an uncertainty of ± 12 percent. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate


McCue, Terrence 11 January 2007 (has links)
The objective of this dissertation was to provide a controlled comparison of identical continuous flow BNR processes both with and without prefermentation in order to provide a stronger, more quantitative, technical basis for design engineers to evaluate the potential benefits of prefermentation to EBPR in treating domestic wastewater. In addition, the even less understood effect of prefermentation on denitrification kinetics and anoxic phosphorus (P) uptake was studied and quantified. Other aspects of BNR performance, which might change due to use of prefermentation, will also be addressed, including anaerobic stabilization. Potential benefits to BNR processes derived from prefermentation are compared and contrasted with the more well-known benefits of primary clarification. Finally, some biokinetic parameters necessary to successfully model both the activated sludge systems and the prefermenter were determined and compared for the prefermented versus the non-prefermented system. Important findings developed during the course of this dissertation regarding the impact of prefermentation upon the performance of activated sludge treatment systems are summarized below: &#149; For a septic COD-limited (TCOD:TP < 40:1) wastewater, prefermentation was found to enhance EPBR by 27.7% at a statistical significance level of alpha=0.05 (95% confidence level). &#149; For septic P-limited (TCOD:TP > 40:1) wastewaters, prefermentation was not found to improve EBPR at a statistical significance level of alpha=0.05 (95% confidence level). &#149; The increased anaerobic P release and aerobic P uptakes due to prefermentation correlated with greater PHA formation and glycogen consumption during anaerobiosis of prefermented influent. &#149; Improvements in biological P removal of septic, non-P limited wastewater occurred even when all additional VFA production exceeded VFA requirements using typical design criteria (e.g. 6 g VFA per 1 g P removal). &#149; Prefermentation increased RBCOD content by an average of 28.8% and VFA content by an average of 18.8%, even for a septic domestic wastewater. &#149; Prefermentation increased specific anoxic denitrification rates for both COD-limited (14.6%) and P-limited (5.4%) influent wastewaters. This increase was statistically significant at alpha=0.05 for COD-limited wastewater, but not for P-limited wastewater. / Ph.D. / Department of Civil and Environmental Engineering / Engineering and Computer Science / Environmental Engineering

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