Method for the chemical treatment of nylon waste in the textruder for adsorbers mainly for the treatment of dyeing effluents (BMWI project No. 226/93)

The aim of the investigation was to determine whether nylon waste can be modified in a continuous process in the extruder as well as in the laboratory in order to produce absorbers for decolorizing effluents after the dyeing of cellulosic fibres with reactive or direct dyes. A large-scale test on a double-screw extruder showed that the re..

Some practical measures for pollution control in textile wet processing

This article reports on how chemicals in industry can cause water pollution. This makes it necessary to cut wate use to a minimum for the processing of textiles. In general, more than 10 steps are required to bleach fabrics, therefore by cutting down a few steps, and combining processes, the volume of water required can be substantially r..

Effluent system

A solution to the problem of disposing of the effluent that arises from wool scouring has been developed in the UK by Youghal Carpets and Stork Engineering. When the yarn is scoured, a water-oil effluent is created which also contains detergent and sodium bicarbonate. Using membrane filtration technology pioneered by Stork Engineering, a ..

Sorption materials from specially-treated nylon waste as adsorbers for dyeing effluents

Nylon waste is treated and turned into absorbers for use in treating dyeing effluents. Trials show that a large number of acid groups impairs sorption, whereas an appreciable improvement is a chieved with a rising number of amino end groups. Tests are carried out in relation to the sorption of reactive or direct dyes.

Studies in colour removal by coir pith

Colour removal from aqueous solutions using activated carbon prepared from coir pith was investigated. Coir pith residue was activated in a furnace at 400℃ for an hour. An aqueous solution of Procion Turquoise blue-HE dye was used to conduct batch adsorption studies. The results were encouraging. The effects of carbon loading, solution p..

Decolorization of dyehouse waste water by ion-pair extraction

This is the continuation of the German text from Melliand Textilberichte, 76(6); see abstract 96W/00457. The whole of the English text was published in that issue also.

Decolorization of dyehouse waste water by ionpair extraction.

Ion-pair extraction with long-chain aliphatic amines in an acid medium is shown to be an effective process for the treatment of effluents, containing anionic substances. In addition to acid, direct and metal-complex dyes, the technique permits almost quantitative removal of reactive dyes. By adding an alkali, the amines can be recovered a..

Decolorization of waste water from reactive dyes.

Effluent from using eleven reactive dyes having different chromophores and different reactive groups have been exposed to different pH values in daylight and in the dark. Laser radiation, ultraviolet radiation, ultraviolet radiation in combination with hydrogen peroxide at alkali pH and ultravilet radiation combined with hydrogen peroxide..

Environmentally-correct treatment and/or disposal of concentrated textile effluents by anaerobic treatment

Laboratory-scale and pilot-plant tests are used to examine whether highly-concentrated dyeing/printing effluents can be treated by an anaerobic method. Reactive dyes can be decolorized up to 99％ by this treatment. High AOX concentrations from printing pastes and residual dye liquors are also largely eliminated. An aerobic stage after the..

Possibilities for dyeing aromatic polyamides with high color fastnesses

The feasibility of dyeing aromatic polyamides (aramids) in order to produce high colour fastness is examined. Experiments have shown that m-aramids can be dyed with acid, metallic complex and disperse dyestuffs, though the light fastnesses are not greater than those obtained with the basis process. Ammonia pretreatment leads to improved d..