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imensa

Resultados (Inglês) 1:

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Resultados (Inglês) 3:

Viraraghavan, 2001). During the dyeing process, approximately 10–15% of the used dye, depending on the structure, is released into the wastewaters, causing serious environmental and health hazards (Chen et al., 2003). The presence of the dyes in aqueous ecosystems diminishes the photosynthesis by impeding the light penetration into deeper layers thereby deteriorating the water quality and lowering the gas solubility. Furthermore the dyes and / or their degradation products may be toxic to flora and fauna (talarposhti et al., 2001). Thus, decolorization of textile wastewaters has been a major environmental concern for a long time. Chemical or physico-chemical treatment methods such as coagulation / adsorption, complete destruction of dye molecules by electrolysis or ozonation, etc., are in general inefficient, costly and of limited applicability, while sometimes producing large amounts of toxic waste which is diff icult to dispose of (Banat et al., 1996; Verma et al., 2003; Zhang et al., 2004). The conventional aerobic wastewater