METHODS FOR REMOVING PIGMENTS FROM WASTE WATER

Abstract

Relevance. Dyes and pigments are natural and xenobiotic compounds that are widely used in various fields of human activity due to their ability to impart color to objects. During the implementation of production with the use of pigments, wash water containing pigment is formed, which is most often waste water. As a result, the enterprise loses some of its valuable pigments and dyes, and the environment is exposed to technogenic impact. Various colorants in water have an adverse effect on the environment. Therefore, purification of waste water from pigments is an urgent problem. Aim: finding the most efficient and cost-effective technological process for wastewater treatment from pigments and dyes. Methods: collection, generalization and comprehensive analysis of data on methods of wastewater treatment from dyes and pigments. Results. The paper considers the existing technologies of treatment of wastewater containing pigments and dyes and introduces the examples of Russian and foreign experience. It is shown that it is impossible to create a unified treatment technology of wastewater containing pigments and dyes, since the choice of a specific treatment is influenced by the characteristics of wastewater due to the production technology and the type of pigments and dyes. Nevertheless, it is possible to systematize the existing technologies for a more convenient and quick selection of the required technological process. The authors have described the mechanical, mass transfer, chemical and biological purification processes and analyzed both individual processes and a combination of several ones. The use of several processes in one technological stage of wastewater separation is the most efficient and cost-effective solution.

Keywords

• textile wastewater
• dyes
• physical treatment
• biodegradation
• adsorption
• membrane treatment