Hsu Yung-Chien, Chen Yi-Fu, Chen Jyh-Herng
Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2004;39(1):127-44. doi: 10.1081/ese-120027373.
This work studied the decolorization of dye C.I. Reactive Blue 19 (RB-19) solution in a new gas-inducing reactor under continuous process. The decolorization behavior, decolorization kinetic, ozone utilization rate (UO3), and Chemical Oxygen Demand (COD) are examined under various operation conditions, such as input ADMI color values (ADMIo), input liquid flow rates (QL), input ozone gas concentrations (CO3,i), input gas flow rates (Qg), and agitation speeds (N). Experimental results of decolorization behavior indicate that the American Dye Manufactures Institute (ADMI) removal percentage (RADMI) decreases with increasing ADMI color value input rate or decreasing ozone input rate. For the study of ozone utilization rate, UO3 increases with increasing ADMI color value input rate or decreasing ozone input rate. The 70% ADMI removal percentage can be regarded as the index of the competition of dye and its unknown intermediates for ozone. In addition, the increase of the agitation speed can improve the ADMI removal percentage as well as the ozone utilization rate. A pseudo-first order kinetic model is adopted to describe the decolorization behavior. At steady state, the overall decolorization rate constant, kADMIs.s., can be expressed as a function of liquid flow rate, input ADMI color value, input ozone gas concentration, gas flow rate, and agitation speed. This correlation can be used to predict the ADMI color value at steady state (ADMIs.s.) and the reactor size in the continuous process. The deltaO3/deltaCOD is dependent on the liquid composition. The higher the dye concentration in the liquid, the higher the deltaO3/deltaCOD. The COD removal percentage (RCOD) and the ozone utilization rate can be further improved by using the continuous operation with two reactors in series.
本研究在新型气体诱导反应器中对活性蓝19（RB - 19）染料溶液进行连续脱色处理。考察了在不同操作条件下，如输入的美国纺织化学家和染色家协会（ADMI）颜色值（ADMIo）、输入液体流速（QL）、输入臭氧气体浓度（CO3,i）、输入气体流速（Qg）和搅拌速度（N）下的脱色行为、脱色动力学、臭氧利用率（UO3）和化学需氧量（COD）。脱色行为的实验结果表明，美国染料制造商协会（ADMI）去除率（RADMI）随ADMI颜色值输入速率的增加或臭氧输入速率的降低而降低。对于臭氧利用率的研究，UO3随ADMI颜色值输入速率的增加或臭氧输入速率的降低而增加。70%的ADMI去除率可作为染料及其未知中间体对臭氧竞争的指标。此外，搅拌速度的增加可以提高ADMI去除率和臭氧利用率。采用拟一级动力学模型描述脱色行为。在稳态下，总脱色速率常数kADMIs.s.可表示为液体流速、输入ADMI颜色值、输入臭氧气体浓度、气体流速和搅拌速度的函数。这种相关性可用于预测连续过程中稳态下的ADMI颜色值（ADMIs.s.）和反应器尺寸。deltaO3/deltaCOD取决于液体组成。液体中染料浓度越高，deltaO3/deltaCOD越高。通过串联两个反应器进行连续操作，可以进一步提高COD去除率（RCOD）和臭氧利用率。
