Colour Removal from Dyehouse Effluents Using Synthetic Organic Coagulants.

Allied Colloids supplies synthetic organic coagulants for removing color from dyehouse effluents. The addition of a suitable quantity of coagulant to an effluent promotes precipitation of dye residues to form small, insoluble particles. Subsequent flocculation promotes agglomeration of the particles. A typical color removal plant that uti..

Effluent Treatment Using Chemical Flocculation.

Techspan Associates, together with the Clean Water Company Limited, develop inexpensive effluent treatment systems suitable for use by the textile industry. The primary component of Techspan systems is a tangential flow separator, which is a highly efficient sedimentation and clarification unit. If the discharge requirements for chemical ..

Color Removal from Textile Plant Effluents.

Researchers investigated the reaction of various dyes with water treatment techniques for color removal. Treatments used included coagulation/flocculation, membrane filtration activated carbon filtration, and ozonation. Sulfur and disperse dyes coagulated well, but acid, direct, vat, mordant, and reactive dyes performed poorly. Cationic d..

Electrochemical Treatment of Colored Effluent.

Research on the electrochemical treatment of colored effluent developed a pilot plant to test its output in the purification of residual water from dyeing operations. The purification process, which comprised an oxidative reaction, used electrolytic cells that operated primarily in a pH range of 5-6. its use at atmospheric pressure and am..

Effect of Hardness of Water on Textile processing.

Researchers investigated water hardness of samples obtained from aquifers in the Rajasthan region. The study evaluated 60 samples collected from wells throughout the city of Jodhpur. Chemical parameters evaluated included cations, anions, pH, total dissovled solids, conductivity, and total hardness. Results indicated that 90 percent of th..

The Future of Color Matching.

Rapid advances in electronics technology, optics systems, and spectral data performance capabilities have rendered older spectrophotometers obsolete. Portable color matching instruments can now measure, analyze, and display color data independently, witho

Ecological Requirements for Dyeing Systems - Parameters for Vat Dyes.

Wastewater problems associated with the vat dyeing of textiles include low biodegradability of commonly used dispersing agents, high chemical oxygen demand due to auxiliaries, heavy metal content, and sulfite/sulfate content. Reduction of these problems relies on the use of easily biodegradable dispersing agents and other auxiliaries. Hyd..

Minimization of the Consumption of Urea in Printing Pastes with Reactive Dyes on Viscose

The objectives of this research were to minimize the use of urea in printing pastes containing reactive dyes for viscose fibers by its total or partial substitution. Experimental variables included the quantity of urea in the printing paste, drying temperature prior to steaming, and the type of colorant (chemical composition, reactivity, ..

Studies of Photostability of Jute Fibre.

Researchers investigated three methods to improve the photostability of jute fabrics: modification of the bleaching and dyeing processes, applying select treatments after bleaching or dyeing, and using particular dyes. After dyeing and processing, samples of plain weave jute fabric were evaluated for whiteness, yellowness, redness, K/S va..

Ultraviolet light/hydrogen peroxide sytem for decolorizing spent reactive dyebath waste water

Decolorizing spent reactive dyebath water with ultraviolet(UV) radiation in the presence of hydrogen peroxide was investigated both by batch operation and by using continuous circulation methods. Reactive dyes subjected to study were Reactive Blue 21, a c