The textile processing plants utilize a wide variety of dyes and other chemicals such as acids, bases, salts, detergents, sizes, oxidants, mercerizing and finishing chemicals. Many of these are not retained in the fin...The textile processing plants utilize a wide variety of dyes and other chemicals such as acids, bases, salts, detergents, sizes, oxidants, mercerizing and finishing chemicals. Many of these are not retained in the final product and are discharged in the effluent. Therefore, the objective of this study was to assess the performance of Expanded Granular Sludge Bed （EGSB） reactor to treat synthetic textile wastewater. Several experiments using Direct Red 81 and volatile fatty acids as model substrates were conducted. The problems of decolorization was evaluated at a variety of relevant operational conditions, such as substrate concentration, organic and hydraulic loading rates. The results showed that retention time of EGSB equals 1.6 h and 80 mg/L at the hydraulic and dye concentration respectively, and that the color removal efficiency can reach 90%. Additionally, some chemical additions were proposed to improve the decolorization rate and increase the treatment efficiency of the system. For instance, sulfide was added at 200 mg/L in the influent, which can increase the dye removal efficiency to 95%.展开更多
文摘The textile processing plants utilize a wide variety of dyes and other chemicals such as acids, bases, salts, detergents, sizes, oxidants, mercerizing and finishing chemicals. Many of these are not retained in the final product and are discharged in the effluent. Therefore, the objective of this study was to assess the performance of Expanded Granular Sludge Bed （EGSB） reactor to treat synthetic textile wastewater. Several experiments using Direct Red 81 and volatile fatty acids as model substrates were conducted. The problems of decolorization was evaluated at a variety of relevant operational conditions, such as substrate concentration, organic and hydraulic loading rates. The results showed that retention time of EGSB equals 1.6 h and 80 mg/L at the hydraulic and dye concentration respectively, and that the color removal efficiency can reach 90%. Additionally, some chemical additions were proposed to improve the decolorization rate and increase the treatment efficiency of the system. For instance, sulfide was added at 200 mg/L in the influent, which can increase the dye removal efficiency to 95%.
