Adsorption of Basic Dyes on Granular Activated Carbon and Natural Zeolite.

An agitated batch adsorber measured the adsorption of basic dyes from an aqueous solution onto granular activated carbon and natural zeolite and determined the effects of agitation, initial dye concentration, and adsorent mass. Adsorption data yielded Langmuir and Freundlich adsorption isotherms. An empirical equation represented the depe..

Color Removal of Textile Wastewater Containing Acid Dyes Using Sodium Ditionite.

Researchers used sodium ditionite to decolor acid dye wastewater and evaluated the effects of pH, sodium ditionite concentration, dye concentration, and temperature on decoloration efficiency. Treatment conditions of pH 7 at 30 minutes with a sodium ditionite concentration of 2-3 grams pr liter achieved optimal decoloration Wastewater tem..

Kinetic Characteristics of Bacterial Azo-Dye Decolorization by Pseudomonas Iuteola.

Researchers evaluated the effects of substrate concentration; medium composition; and such process parameters as pH, temperature, and dissolved oxygen on the ability of Pseudomonas luteola to decolor azo dye wastewater. High performance liquid chromatography and mass spectrometry analyzed the metabolites resulting from the bacterial decol..

Dye Removal from Textile Dye Wastewater Using Recycled Alum Sludge.

Researchers evaluated the effectiveness of coagulation with recycled alum sludge in removing hydrophobic and hydrophilic dyes from textile wastewater. The recycled alum sludge removed hydrophobic dye from the effluent and reduced the required fresh alum dosage by approximately 30 percent. A small amount of fresh alum added to the system c..

Washfastness of Reactive Dyes: Current Tests and Theory for Peroxide Attack.

Discrepancies in the results from washfastness tests of reactive dyes suggest the existence of a cumulative mechanism in repeated washings that is different from that of th BS 1006 UK-TO single simulation test. Experiments with seven azo dyes suggested that declines in the washfastness of dyed samples subjected to the single simulation te..

Frequency-Controlled Statellite Drop Inhibition in Extensional-Hardening Fluids.

Ink jet printing and microencapsulation require the formation of uniform drops. The formation of satellite drops is a nonlinear phenomenon initiated by the growth of higher harmonics. A study to quantify effect of viscoelasticity on drop formation in well characterized extensional hardening fluids analyzed jet breakup resulting from a for..

Non-Ecofriendly Textile Processing -- Section 2: Hazardous Metals in Dyeing/Printing.

Sodium hydroxide manufactured in mercury cells via the electrolytic method and used in scouring, bleaching, mercerizing, vat dyeing, and naphthol dyes is accompanied by traces of mercury that sometimes remain in the finished fabric. Cadmium accompanies zinc salts in zinc acetate catalysts used with silicone softeners, zinc nitrate catalys..

Highlights of Processing Machinery -- X. G.

Atospheric rope dyeing machines and overflow/softflow dyeing machines are suitable for batch dyeing delicate fabrics prone to pilling or sensitive to superficial abrasion and over tension. An overview of these machines exhibited at India ITME 2000 describes ATYC's Overflow BT and Overflow BT-Duplex F rope dyeing machines; Bellini's FallFl..

Technodye: New Definition in HT Rope Dyeing.

Argelich Termes Y. Cia's Technodye, a high temperature rope dyeing machine, has Teflon lined storage chambers with 150 kilogram or 225 kilogram capacities. Its single size fabric booster is removable for cleaning. Other features include a cylindrical inner transport reel designed to resist stretching and scuff marks, synchronized reel and..

Highlights of Processing Machinery -- XI. G.

Processing machinery exhibits at ITME 2000 featured several atmospheric overflow and softflow dyeing machines. Krsna's K2002 machine with six chambers provides tensionless dyeing of woven, terry, knit, crepe, woolen, and sensitive fabrics. Thies' line of softflow dyeing machines provide smooth fabric runs, reliable guidance, and gentle tr..