Aksu Zümriye, Cağatay Seyda Sen, Gönen Ferda
Hacettepe University, Chemical Engineering Department, 06532 Beytepe, Ankara, Turkey.
J Hazard Mater. 2007 May 8;143(1-2):362-71. doi: 10.1016/j.jhazmat.2006.09.039. Epub 2006 Sep 19.
A continuous fixed bed study was carried out by using dried Rhizopus arrhizus as a biosorbent for the removal of three reactive dyes; Gemacion (Procion) Red H-E7B (GR), a monoclorotriazine mono-azo type reactive dye; Gemazol Turquise Blue-G (GTB), a vinyl sulfone mono-azo type reactive dye and Gemactive (Reactive) Black HFGR (GB), a vinyl sulfone di-azo type reactive dye from aqueous solution. The effect of operating parameters such as flow rate and inlet dye concentration on the sorption characteristics of R. arrhizus was investigated at pH 2.0 and at 25 degrees C for each dye. Data confirmed that the total amount of sorbed dye decreased with increasing flow rate and increased with increasing inlet dye concentration for each dye. The column biosorption capacity of dried R. arrhizus was 1007.8 mg g(-1) for GR dye, 823.8 mg g(-1) for GTB dye and 635.7 mg g(-1) for GB dye at the highest inlet dye concentration of approximately 750 mg l(-1) and at the minimum flow rate of 0.8 ml min(-1). Thomas and Yoon-Nelson models were applied to experimental data to predict the breakthrough curves and to determine the biosorption capacity of the column for each dye useful for process design. Both models were found suitable for describing the whole dynamic behavior of the column with respect to flow rate and inlet dye concentration.
采用干燥的无根根霉作为生物吸附剂，对三种活性染料进行连续固定床研究，以去除水溶液中的活性染料：Gemacion（普施安）红H-E7B（GR），一种单氯三嗪单偶氮型活性染料；Gemazol翠蓝-G（GTB），一种乙烯砜单偶氮型活性染料；以及Gemactive（活性）黑HFGR（GB），一种乙烯砜双偶氮型活性染料。在pH 2.0和25℃条件下，针对每种染料研究了流速和进水染料浓度等操作参数对无根根霉吸附特性的影响。数据证实，每种染料的吸附染料总量随流速增加而降低，随进水染料浓度增加而增加。在最高进水染料浓度约750 mg l(-1)和最低流速0.8 ml min(-1)条件下，干燥无根根霉对GR染料的柱生物吸附容量为1007.8 mg g(-1)，对GTB染料为823.8 mg g(-1)，对GB染料为635.7 mg g(-1)。将托马斯模型和尹-尼尔森模型应用于实验数据，以预测穿透曲线并确定柱对每种染料的生物吸附容量，这对工艺设计很有用。结果发现这两种模型都适用于描述柱在流速和进水染料浓度方面的整个动态行为。
