REMOVAL AND RECOVERY OF A HIGH WATER SOLUBILITY DYE -- ACID ANTHRAQUINONE BLUE FROM AQUEOUS SOLUTION BY BIOSORPTION OF GROWING MYCELIAL PELLETS OF P. FREQUENTANS SP. ZD20

摘要

Wastewater containing dyes, which is mainly discharged from dyeing and printing industry and dye manufacturing industry, is difficult to treat with traditional biological methods due to resistance of dye molecule to biodegradation. Existing physical and chemical methods such as activated carbon adsorption, chemical flocculation and ozonation could not used widely because of high cost or serious second pollution. Degradation techniques that have been studying for a long time, for example, biodegradation of specific microorganisms, TiO_2 photo-catalytic degradation, Fenton's regent oxidation and so on, merely remove color in the wastewater by destroying molecule structure of dye or its chromophore, dyes could not be recovered with these methods. However, the wastewater frequently contains a great quantity of dyes, about 20～40% of dye is lost in the process of dyeing, about 10% of dye is lost in the course of manufacture and dye manufacturing wastewater has higher dye concentration than dyeing and printing wastewater. So it is more valuable and meaning to recover the dye while decoloring the wastewater.