Recycling of wastewater from textile dyeing using membrane filtration

In this article, Carl-Erik Nielson of Union Filtration reports on results from a pilot plant using crossflow membrane filtration to treat textile dyeing effluent. The process give sufficient quality to enable 97-99％ of the permeate to be recycled back into the dyeing process.

On-line monitoring and control of the textile wastewater colour removal process

On-line monitoring of the wastewater colour and ORP values is used to carry out laboratory studies for collecting data to assist in formulating model equations that can be used to achieve better control and automation of the oxidation process for colour removal from textile finish wastewaters. Using the model, the dosage requirement, the ..

Utilizing flyash for colour removal of dye effluents

Since flyash is a rich source of silica, alumina, and other oxides, it has been explored for the removal of colour from dye effluents. Different classes of dyes have been studied at varying dye concentration and quantity of adsorbent. Much better results have been obtained in the case of a diluted sample as compared to a concentrated dye ..

Wastewater decolorization and TOC-reduction by sequential treatment

The treatment of wastewater from the textile industry is studied by a process of sequential treatment of UV/H₂O₂/O₃. Results of the decolorization of the effluent and the reduction of total organic carbon (TOC) are measured. Two wastewater streams from a textile plant using direct dyes Black 22 and Blue 199 are collected individually f..

A colourless solution

A process developed by The Clean Water Company claims to remove 100％ of the colour from effluent water. This process, is based on chemical flocculation followed by solids separation. More simply, the effluent particles, including colour, gather together and separate as a solid to leave virtually clean water. The method can bring substant..

Studies on colour removal by activated charcoal

Batch adsorption studies are carried out using different classes of dyes in aqueous solutions as coloured water with activated charcoal. The effect of the variables, namely carbon loading, pH of solution, dye concentration, and shaking time on adsorption are studied. Results obtained are encouraging.

Removal of dyewaste colour from sewage effluent - the use of a full scale ozone plant

Textile dyeing within the Severn Trent Region of England produces highly coloured wastewater. This dyewaste is usually discharged untreated to foul sewer. Conventional treatment at the receiving sewage treatment works removes little colour resulting in coloration of effluents and rivers in certain areas. The regulatory body (N. R. A.) has..

Ozonation-an important technique to comply with new German laws for textile wastewater treatment

The German textile industry is challenged by the introduction of new governmental regulations in the field of textile wastewater treatment. This causes a large increase of water costs in comparison with other European countries. Many economic experts even see Germany seriously endangered as a place of textile production, however there are..

Textile plant waste water treatment

The EEC Waste-Sep system is a complete skid-mounted system, that will recover 80％ of the water from wastewater for reuse in the factory process, including NaOH recovery if required, without the use of conventional chemical precipitation. The 20％ rejected waste water, can be treated in the EEC High-Speed Biosystem, in which all organic m..

The importance of proper extraction and drying

This article explains the importance of extraction and drying in the dyeing process. Several types of drying methods are reported, with ratio frequency drying and the improved Avesta Drying systems, as the two methods newest to the industry, being described.