Kinetic Study of Treatment of Reactive Dye in a Biological Activated Carbon

• Main Authors: Hsin-lung Li, 李欣龍
• Other Authors: Yen-Hui Lin
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/57329020796185769181

碩士 === 中臺科技大學 === 安全與防災科技研究所 === 100 === Synthetic dyes were widely used in paper-printing, color photography, medicine and cosmetics etc. Approximately 90% reactive dyes flowed into receiving river from wastewater plant because the reactive dyes were not easy to be degraded by activated sludge. Conventional methods to deal with textile wastewater mainly included physical and chemical methods. Although, these methods were effective to treat textile wastewater, these methods have some disadvantages such as high cost, high energy requirement, and easy to produce chemical waste sludge. In this study, biological activated carbon was used to treat reactive dye in continuous-flow reactor. The batch kinetic tests were conducted to determine the yield coefficient of dye-degrading (F. trogii) cells, which was equal to 0.204 mg cell/mg RO16. The maximum specific growth rate (mm) was 0.63 day-1. The maximum specific utilization rate (k) was 3.1 mg RO 16/mg cell-day. The half-saturation constant was 107.3 mg RO 16/L. The decay coefficient of F. trogii cells was 0.024 day-1. The diffusion coefficient of RO 16 in biofilm was 0.192 cm2/day. The liquid film mass transfer coefficient was 346.8 cm/day. The shear-loss coefficient of F. trogii cells was 0.253 day-1. A continuous-flow fixed-biofilm reactor using activated carbon as a supporting medium was conducted in the laboratory. The experimental results show that the pH was maintained at 7.3-8.4 and influent DO was maintained at 7.8-8.2 in the influent. The pH and DO in effluent was 5.0-6.7 and 5.0-6.6 mg/L, respectively. The effluent concentration of RO 16 was 0.01-0.02 mg/L while the influent concentration of RO 16 was maintained at 10 mg/L. Once the influent concentration of RO 16 increased to 50 mg/L, the removal efficiency was about 97-98%. Moreover, the removal efficiency reached at 97-98% when the influent concentration of RO 16 was maintained at 100 mg/L.