Progress of Dye Wastewater Treatment Methods

Abstract

Wastewater treatment is an important aspect of the dyestuffs industry, as the process of dye production generates a large amount of wastewater containing various organic and inorganic pollutants. To protect the environment, effective wastewater treatment methods, such as chemical oxidation and biodegradation, are needed to remove pollutants from the wastewater and to meet the discharge standards. This paper reviews the research progress of dye wastewater treatment methods, including flocculation and precipitation, oxidation, electrochemistry, biodegradation, adsorption, etc. The different treatment methods are introduced and their current status and advantages and disadvantages are reviewed. Chemical methods have short treatment time and good effect, but the process is complicated and not easy to operate, and the intermediate products produced may have greater toxicity; biological methods have the advantages of environmental protection and mild conditions, but the treatment time is generally longer, and the poor biochemistry of many dyestuffs restricts the use of biological methods; physical methods have been widely used because of their simple operation and adaptability, among which adsorption is commonly used in the decoloration treatment of wastewater. Undoubtedly these researches are of great significance in recognizing the nature and characteristics of pollutants and mastering the principles and methodological features of environmental treatment technologies.