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Decoloration, of wastewater

Although it has been reported (138) that decolorization of wastewater containing reactive azo dyes with sodium hydrosulfite is possible only to a limited extent, others have demonstrated good reduction (decolorization). For example, using zinc hydrosulfite for the decolorization of dyed paper stock (139) resulted in color reduction of 98% for azo direct dyes (139). A Japanese patent (140) describes reducing an azo reactive dye such as Reactive Yellow 3 with sodium hydrosulfite into its respective aromatic amines which ate more readily adsorbable on carbon than the dye itself. This report has been confirmed with azo acid, direct, and reactive dyes (22). [Pg.382]

Anaerobic decolorization of azo dyes was started back in the 1970s. Reticulated sintered glass was used as immobilization of anaerobic bacteria for the decolorization of wastewater and transformation of the azo dye to degradable products [58], Full decolorization was achieved in less than 4 h HRT, and in addition to it, methane as biogas was also produced. [Pg.80]

The following are some of the typical industrial applications for liquid-phase carbon adsorption. Generally liquid-phase carbon adsorbents are used to decolorize or purify liquids, solutions, and liquefiable materials such as waxes. Specific industrial applications include the decolorization of sugar syrups the removal of sulfurous, phenolic, and hydrocarbon contaminants from wastewater the purification of various aqueous solutions of acids, alkalies, amines, glycols, salts, gelatin, vinegar, fruit juices, pectin, glycerol, and alcoholic spirits dechlorination the removal of... [Pg.279]

Acid Orange 7 and many other dyes Bacterial consortium TJ-1 consisting of Aeromonas caviae, Proteus mirabilis, and Rhodococcus globerulus Decolorization of Acid Orange 7 was significantly higher with the consortium as compared to the individual strains. More than 90% decolorization could be achieved even at 200 mg L 1 within 16 h. The consortium also decolorized 15 other azo dyes individually as well as a simulated wastewater containing a mixture of all the 16 azo dyes [58]... [Pg.20]

Kapdan IK, Tekol M, Sengul F (2003) Decolorization of simulated textile wastewater in an anaerobic-aerobic sequential treatment system. Process Biochem 38(7) 1031-1037... [Pg.70]

Georgiou D, Hatiras J, Aivasidis A (2005) Microbial immobilization in a two stage fixed bed reactor pilot plant for onsite anaerobic decolorization of textile wastewater. Enzyme Microb Technol 37 597-605... [Pg.84]

Lately, the accelerating effect of functionalized polypyrrole (PPy) composites consisting of ACF/PPy/AQDS is studied during the biological decolorization processes of azo dyes [50]. This study suggests that ACF/PPy/AQDS play a good catalytic role and accelerate the reductive decolorization of different azo dyes by an anaerobic consortium. But their use in the practical full-scale wastewater treatment still needs to be proved in the future studies. [Pg.97]

Guo J, Zhou J, Wang D et al (2005) Decolorization of dye wastewater with high salt concentration by the Acclimatized salt-tolerant cultures. J Environ Sci 17(6) 984—988... [Pg.98]

Georgiou D, Aivasidis A (2006) Decoloration of textile wastewater by means of a fluidized-bed loop reactor and immobilized anaerobic bacteria. J Hazard Mater 135 372-377... [Pg.130]

The effectiveness of a combined reduction-biological treatment system for the decolorization of nonbiodegradable textile dyeing wastewater has been investigated. The bench-scale experimental comparison of this technique with other reported combined chemical-biological methods showed higher efficiency and lower cost for the new technique [35]. [Pg.139]

Nilsson I, Moller A, Mattiasson B, Rubindamayugi MST, Welander U (2006) Decolorization of synthetic and real textile wastewater by the use of white-rot fungi. Enzyme Microb Technol 38 94-100... [Pg.168]

Fu Y, Viraraghavan T (2001) Fungal decolorization of dye wastewaters a review. Biores Technol 79 251-262... [Pg.191]

Fig. 39. Bench-scale set-up and flow diagram for removal of metals and dyes (decolorization) from wastewaters [226]... Fig. 39. Bench-scale set-up and flow diagram for removal of metals and dyes (decolorization) from wastewaters [226]...
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See also in sourсe #XX -- [ Pg.94 ]



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Decoloration

Decoloring

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Decolorizing

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