Food or edible material: processes – compositions – and products – Processes – Packaging or treatment of packaged product
Patent
1987-05-12
1989-09-26
Page, Thurman K.
Food or edible material: processes, compositions, and products
Processes
Packaging or treatment of packaged product
424405, 424409, A01N 2532
Patent
active
048699055
ABSTRACT:
Various chemolithotrophic bacteria such as Thiobacillus ferrooxidans by direct or indirect mechanisms catalyze the oxidation of metal sulfides and produce acid, i.e. sulfuric acid and soluble metal salts at a much faster rate than chemical oxidation. Elimination of such bacteria would inhibit the formation of the acid. The natural production of such acids is particularly troublesome in mines e.g. coal mines, since acid water is produced which is damaging to the environment. An effective method of abating or eliminating such acid water production is to apply a bactericide such as a biodegradable organic surfactant which at low pH values are bactericides and hence inhibit the bacteria from catalyzing the metal sulfides. The affected acid water site can thus be treated with the surfactant which provides a temporary or short term result usually for a few months. A long term solution, that is 1 year to several years, is provided through the use of a slow release composition of the present invention in which a heterogeneous matrix contains a thermoplastic domain and an organic surfactant domain. A suitable porosity is created when proper amounts of surfactant are utilized so that a long term slow release composition is formed. A method of making the heterogeneous matrix or slow release composition involves the dry blending of a thermoplastic compound and various processing aids, subsequently adding a bactericide thereto and mixing under shear and heat the resulting molten composition. A suitable slow release article can be formed such as pellets.
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patent: 4314966 (1982-02-01), Kleinmann
"Developments in Controlled Release Technology and Its Application in Acid Mine Drainage", by L. A. Fox and V. Rastogi, 1983 Symposium on Surface Mining, Hydrology, Sedimentology and Reclamation, Nov. 27-Dec. 2, 1983.
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"The Effects of Particle Size Distribution on the Rate of Mine Acid Formation and Its Mitigation by Bacterial Inhibitors", by Mark A. Shellhorn, Andrew A. Sobek, and Vijay Rastogi, American Society of Surface Mining & Reclamation, Denver, Colo., Oct. 8-10, 1985.
"Effect of Bactericide Treatments on Metalliferrous Ore Tailings", by Andrew A. Sobek, Vijay Rastogi, and Mark A. Shellhorn, Society for Surface Mining & Reclamation, Mar. 17-20, 1986, Jackson, Miss.
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Pausch Jerry B.
Reutern Eric
Sobek Andrew A.
Hudak Daniel J.
Lindsay James R.
Page Thurman K.
The B. F. Goodrich Company
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