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Adsorption of Colour from Pulp and Paper Mill Wastewaters onto Diatomaceous EarthsCarter, Shane Basil January 2007 (has links)
Abstract Production of pulp and paper from raw wood involves the washing of substantial quantities of highly coloured material from the wood pulp. Although most of this colour is trapped within the mill and the mills wastewater treatment system, discharge of coloured wastewater remains a problem of public concern. Lake Rotorua, New Zealand is filled with sediment consisting almost exclusively of diatoms. The most abundant species, Aulacoseira, has been shown to have very small pores, less than 200 nm, that could be very useful for the capture and holding of large organic molecules. Lake Rotorua is situated close to the two largest pulp and paper mills in New Zealand and may have to be dredged to solve a problem of eutrophication. Wastewaters generated at the Kinleith (Tokoroa) and Tasman (Kawerau) mills in the North island of New Zealand have been used to assess the characteristics of colour removal by Lake Rotorua diatoms. Vacuum filtration through the diatoms succeeded in removing colour but proved to be impractically slow as an industrial process. Addition of diatoms to wastewater streams in stirred experiments showed that significant adsorption took place. The majority of the colour was removed within 30 seconds of mixing. The efficiency of colour removal was found to vary between wastewater streams within the mills. The pH dependency of this removal was tested and found to be most effective in a pH range of 3.6 to 5. Attempts to reuse the diatoms showed that chemical backwash regimes were more effective than calcination. This study concluded that surface silanols were likely to be the principle agent in forming coagulants with the colour material and were subsequently trapped on the diatom surfaces, but more importantly within the pores.
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The effect of urea and related compounds on the mechanical properties of paperFisher, Henry D. 01 January 1951 (has links)
No description available.
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Two essays on the demand for and supply of paper and paperboard productsLuo, Jifeng, January 2003 (has links) (PDF)
Thesis (M.S. in Econ.)--School of Economics, Georgia Institute of Technology, 2004. Directed by Haizheng Li. / Includes bibliographical references (leaves 47-49).
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A study of the diffusion of sorbed water vapor through paper and regenerated cellulose filmsAhlen, Arne T., January 1969 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1969. / Includes bibliographical references (p. 77-79).
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The relation between surface activity and fiber-bond strength in a papermaking pulpAllison, Henry Johnston, January 1940 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1940. / Includes bibliographical references (p. 75-77).
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Oriented fiber refining application of individual modes of mechanical action to single pulp fibers /Biasca, James E. January 1989 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Science and Technology, 1989. / Includes bibliographical references (p. 169-177).
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The effect of strain applied during drying on the mechanical behavior of paperSchulz, John H., January 1961 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1961. / Includes bibliographical references (p. 144-149).
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The distribution of the constituents across the wall of unbleached spruce sulfite fibersKallmes, Otto, January 1959 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1959. / Includes bibliographical references (p. 66-69).
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The role of alumina in the mechanism of rosin sizingRedd, John Coleman, January 1942 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1942. / Includes bibliographical references (p. 83-86).
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An investigation of the mechanism of the dewatering of compressible bedsHisey, Robert W. January 1955 (has links) (PDF)
Thesis (Ph. D.)--Institute of Paper Chemistry, 1955. / Includes bibliographical references (p. 65).
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