Bureau of Mines / Minerals yearbook: Metals, minerals, and fuels 1972
Year 1972, Volume 1 (1972)
Sheridan, Eugene T.
Peat, pp. 897-904 PDF (828.0 KB)
904 MINERALS YEARBOOK, 1972 processes used in the experiments were physical and chemical as well as biological in nature, and the major emphasis was placed upon the removal of phosphorus, which has become a major pollutant in recent years. The studies also showed that various types of peat can be used in such filter systems and that the systems are not only efficient, but they can be operated at relatively high application rates. Additional research work on peat at the University of Sherbrooke,4 evaluated the use of peat as an absorbing agent for the removal of coloring matter from the effluent of a dye house at a textile plant. Many of the dyes used by the textile industry are nonbiodegradable, and their removal in an economic manner remains a problem. Adsorption of these dyes with activated carbon is one of the most promisi-ag of the processes -proposed or used, but activated carbon is a relatively expensive material for this use. The study concluded that sphagnum peat moss of the blond type has good absorption capacity for basic dyes, but this capacity decreases for dyes that are acidic. Also, with an actual effluent from a dye house, competitive adsorption with other polluting material decreased the efficiency of peat moss in reducing the concentration of dyestuff. Laboratory tests,5 confirmed partly on a pilot and technical scale, in Raciborz, Poland, show that peat can be used effectively as a basic raw -material to obtain a number of activated carbons with good physical, chemical, and adsorption properties. Such carbons may be produced, both by gas activation in which peat is treated with steam, carbon dioxide, or air at 700° to 1,000°C, or by chemical activation, based upon the impregnation of peat with chemical compounds. The chemical activation method uses chemicals such as zinc chloride or -phosphoric acid to impregnate the peat, after which it is carbonized and activated at 600° to 700°C. Activated carbons with a high proportion of micropores are generally used for gas and vapor adsorption, carbons with medium-sized pores are used for catalytic and special applications, and macroporous carbons serve as decolorizing and medicinal agents. Peat has been used for the production of all of the aforementioned types of activated carbon as a replacement raw material for wood charcoal, which -is more costly and, in Poland, becoming increasingly less available because of a timber deficit. Baltic-type peat from the Szczencin and Lebork regions of Poland, which is characteristically low in ash content, is especially amenable to activated carbon production. 4Dufort, Jean, and Maurice Ruel. Peat Moss As An Adsorbing Agent for the Removal of coloring Matter. Proc. 4th Internat. Peat Cong., Otaniemi, Finland, June 25—30, 1972, v. 4, pp. 299—310. ' Fica, Jozef. Investigations on Peat Utilization for the Production of Activated Carbon. Proc. 4th Internat. Peat Cong., Otaniemi, Finland, June 25—30, 1972, v. 4, pp. 185—196.
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