Application of zeolitised coal fly ashes to the depuration of liquid wastes |
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Authors: | Emilia Otal Natalia Moreno José Vale |
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Affiliation: | a Dpto. Ingeniería Química y Ambiental, E.S. Ingenieros Industriales, Universidad de Sevilla, Camino de los Descubrimientos s/n, Seville E-41092, Spain b Instituto de Ciencias de la Tierra Jaume Almera (CSIC), Barcelona, Spain |
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Abstract: | In this study, the application of some zeolitised fly ashes and synthetic zeolites to the decontamination of the leachate produced in a municipal solid waste (MSW) treatment plant and to the liquid waste from a pig farm was analyzed. Thus, the reduction of organic matter (BOD and COD), ammonium and total nitrogen, phosphorus and metals contents after a zeolite treatment was evaluated. Several synthetic zeolites were tested: some commercial zeolites and other synthetic zeolites and zeolitised ashes obtained after a coal fly ash alkaline hydrothermal process. Two forms of contact between the zeolitic material and the liquid waste were tested: in a stirred tank and in a column. In addition, other variables determined were the amount of zeolite and the residence time. The results showed that zeolites, especially zeolitised fly ash, clearly produced a strong reduction in the leachate nitrogen and phosphorus content. |
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Keywords: | Municipal waste leachate Zeolitised fly ash Leachate treatment |
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