Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1991-12-23
1994-03-22
Thibodeau, Paul J.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
21050027, 21050042, 210688, 210728, 210767, 210777, 210912, 428407, B32B 516
Patent
active
052962938
ABSTRACT:
A particulate material suitable for the removal of heavy metals from an aqueous effluent comprises a finely ground solid encapsulated in a microporous shell of a polyvinyl chloride. The solid may be peat. The shell comprises a sufficient amount of polyvinyl chloride to utilize the adsorptive qualities of the peat while imparting structural integrity thereto. A process for making the particulate material comprises the steps of dissolving a polyvinyl chloride in an organic solvent therefor to produce a polymer solution, combining the polymer solution with a solid to produce a homogenous dispersion, forming droplets from the dispersion and contacting the droplets with water to precipitate out a particulate material comprising a finely ground solid encapsulated in a microporous shell of the polyvinyl chloride. The material may be modified after the solid is encapsulated, or the solid of the material may be modified before it is encapsulated. The material or the peat is modified with a calcium salt, such as calcium carbonate, or a sodium salt, such as sodium hydroxide. Raw peat which is modified with a calcium salt, preferably calcium carbonate, is also suitable for the removal of heavy metals from an aqueous effluent.
REFERENCES:
patent: 4829045 (1989-05-01), Fransham
"Treatment of Metal Finishing Wastewater with Peat Moss Contact Column"-Slocum, Blanc and O'Shaughnessy-pp. 364-376-Pub. Date 1987.
OP 11-92. Biosorption of Metal Contaminants From Acidic Mine Waters, by C. R. Ferguson and T. H. Jeffers.
Corwin, Richard R. and Jeffers, Tom H., Conf. Proc. for Assoc. for Abandoned Mine Land Programs 1991, 13th annual, "Biosorption of Metal Comtaminants from Acidic Mine Waters", pp. 184-193.
Ferguson, C. R. and Jeffers, T. H., 1991 SME Annual Meeting, Feb. 25, 1991, "Biosorption of Metal Contaminants from Acidic Mine Waters".
Jeffers, T. H., Ferguson, C. R., and Bennett, P. G., U.S. Department of the Interior, Bureau of Mines, Report of Investigations 9340, 1991, "Biosorption of Metal Contaminants Using Immobolized Biomass--A Laboratory Study".
G. V. Cullen et al., Water Res. "Removing Metals From Waste Solutions with Low Rank Coals and Related Materials" 16:1357-1366 (1982).
C. R. Ferguson et al., "Biosorption of Metal Contaminants from Acidic Mine Waters", published in a paper at the 1991 Society of Mining Engineers (SME) Annual Meeting, Feb. 25, 1991 in Denver, Colo.
E. M. Trujillo et al., "Mathematically Modeling the Removal of Heavy Metals from a Wastewater Usiong Immobilized Biomass", published in Environmental Science and Technology, vol. 25, No. 9, 1559-65 (1991).
C. H. Fuchsman, Peat Industrial Chemistry and Technology, Chapter 12, "Humic Acids and Lignins", pp. 136-160, Academic Press (1980).
E. I. Du Pont de Nemours and Company
Le H. Thi
Thibodeau Paul J.
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