The ECUVal project is a green business based on an innovative wastewater system which combines electrochemical techniques with UV irradiation for the treatment of dyeing textile wastewaters and the reuse of the treated effluents.

The textile dyeing and finishing industry produces large volumes of coloured wastewater. An important problem arises in reactive dyes processes as they are non biodegradable and require high amounts of salt. ECUVal is mainly addressed to them. The current policies concerning water and energy consumption conduce to the recycling and reuse.

Quantified environmental impacts

Saving 70-100% dyeing water.
Saving 60-15% dyeing electrolyte.
Lower effluent salinity which also reduces the cost of the effluents discharge.


Production process
The textile dyeing and finishing industry in one of the main water consumer industries and generates high volume of wastewater generally with a high coloration and salinity. Reactive dyes are the most used in the textile industry. Their main inconvenient is that they have aromatic rings in their large molecules that provide them chemical stability and resistance to the microorganisms attack. Consequently, they are not removed in the conventional biological treatment and the use of specific tertiary treatments is required. The most common tertiary treatments are based on the separation of dyes from the effluent. They generate a waste which requires a further treatment to remove the concentrated pollutants.

ECUVal treatment is constituted by and electrochemical cell and an UV source, applied to exhausted dyebath and washing effluents. The subsequent step consists on reuse of the treated effluent in a new dyeing process. This system solves the problem of effluent coloration and in addition, it enables the reuse of dyeing water and dyeing electrolyte. Moreover, the wastewater salinity is also reduced which is an important advantage in the countries where the riverbed flows are scarce.

There is no other recycle-treatment which combines electrochemical and UV irradiation methods where dyes decolouration is produced in the same dyeing bath. The addition of reagents is not required as the electrolysis is carried out with the salts already contained in the effluent. The reuse step also reaches important savings on dyeing water and electrolyte. Taking into account all these points, the ECUVal system can be considered as a new and eco-friendly technology.