Fate of water soluble azo dyes in the activated sludge process

Results of pilot-scale experiments to determine the fate of the eleven dyes which passed through the treatment process, four were significantly adsorbed on surplus activated sludge and three were biodegraded. A further eleven dyes were also studied, but no concldusions could be drawn because of poor recovery from various matrices analysed..

Elimination of textile dyes from aqueous solutions by isothermal adsorption at 25℃

A study is made of the suitability of natural absorbers with a high silicon(IV) oxide component for removing various dyes (direct, basic and metal-complex) from effluents. It is shown that natural aluminium silicates with an increased fraction o Sio₂ are the most convenient absorbers. There are 17 references.

Coloured effluents of reative dyestuffs: problems and methods to solve them. [II]

This instalment completes the German version of this article. For the previous part see abstract 91W/04678.

Selective separation of heavy metal cations from dyehouse effluent

Tests carried out show it is possible with the aid of polymer-combined aza crown ethers to selectively separate heavy metals, such as copper, from textile processing effluents.

Treatment of textile waste water in view of the new waste water regulations

This paper is addressed mainly to the textile industry in the new federal states of Germany, though legislation is being changed for companies in the old states. Possible solutions for effluent treatment, in particular for minimizing the waste water output, are presented. There is a wide range of public credits and subsidies available at ..

Dyeability of alkali-treated polyester fibre

Dyeability differences attributed to molecular structure of interior and exterior of etched fibres (see abstract 91W/02088) might be better attributed to differences in specific surface area.

Colour removal from textile effluent by the formation of dye inclusion compounds. I. Removal of reactive dyes and their hydrolysates

The possibility of decolourizing dyeing effluent using a macrocyclic ligand (cucurbituril), which forms complexes of low solubility with dyes, was studied. With the exception of one dye, it was possible to remove the colour to a large extent from solutions containing reactive dyes. The influence of the concentration of the ligand and the ..

Colour removal from textile effluent by the formation of dye inclusion compounds. II. Removal of direct dyes

The ability of a macrocyclic ligand (cucurbituril) to form insoluble complexes with direct dyes is examined. The removal of the colour is influenced by the structure of the dyes. The pH of the solution also plays an important role in the colour reduction.

Colour removal from textile effluent by the formation of dye inclusion compounds. III. Use of the solid ligand

The removal of dyes from solution with the macrocyclic ligand cucurbituril is possible even if the solid ligand is used. This process permits the separation of dyes which, in solution, form only weak complexes with the ligand or complexes with relatively good solubility.

Biological methods for cleaning textile effluents

After reviewing prodecures for purifying effluent, the activated sludge process is discussed in greater detail. The Bayer tower biology system, its structure and operation are described. Based on the example of a Danish firm, a tower biological unit is presented as an effluent treatment range for the textile industry.