Ozdemir Ozgur, Turan Mustafa, Turan Abdullah Zahid, Faki Aysegul, Engin Ahmet Baki
Istanbul Technical University, Department of Environmental Engineering, Ayazaga Campus, Maslak, 34469, Istanbul, Turkey.
J Hazard Mater. 2009 Jul 30;166(2-3):647-54. doi: 10.1016/j.jhazmat.2008.11.123. Epub 2008 Dec 7.
In this study, the ability of surfactant-modified zeolite (SMZ) to remove color from real textile wastewater was investigated. Tests were performed in a fixed-bed column reactor and the surface of natural zeolite was modified with a quaternary amine surfactant hexadecyltrimethylammonium bromide (HTAB). The zeolite bed that was modified at 1 g L(-1) HTAB concentration and HTAB flow rate of 0.015 L min(-1) showed good performance in removing color. Effects of wastewater color intensity, flow rates and bed heights were also studied. Wastewater was diluted several times in the ratios of 25%, 50% and 75% in order to assess the influence of wastewater strength. The breakthrough curves of the original and diluted wastewaters are dispersed due to the fact that breakthrough came late at lower color intensities and saturation of the bed appeared faster at higher color intensities. The column had a 3-cm diameter and four different bed heights of 12.5, 25, 37.5 and 50 cm, which treated 5.25, 19.50, 35.25 and 51 L original textile wastewater, respectively, at the breakthrough time at a flow rate of 0.025 L min(-1). The theoretical service times evaluated from bed depth service time (BDST) approach for different column variables. The calculated and theoretical values of the exchange zone height were found with a difference of 27%. The various design parameters obtained from fixed-bed experimental studies showed good correlation with corresponding theoretical values, under different bed heights. The regeneration of the SMZ was also evaluated using a solution consisting of 30 g L(-1) NaCl and 1.5 g L(-1) NaOH at pH 12 and temperature 30 degrees C. Twice-regenerated SMZ showed the best performance compared with the others while first- and thrice-regenerated perform lower than the original SMZ.
在本研究中，对表面活性剂改性沸石（SMZ）去除实际纺织废水颜色的能力进行了研究。测试在固定床柱式反应器中进行，天然沸石的表面用季铵盐表面活性剂十六烷基三甲基溴化铵（HTAB）进行改性。在HTAB浓度为1 g L⁻¹且HTAB流速为0.015 L min⁻¹的条件下改性的沸石床在去除颜色方面表现出良好性能。还研究了废水颜色强度、流速和床高的影响。为了评估废水强度的影响，废水按25%、50%和75%的比例进行了多次稀释。原始废水和稀释废水的穿透曲线是分散的，这是因为在较低颜色强度下穿透来得较晚，而在较高颜色强度下床的饱和出现得更快。该柱直径为3 cm，有12.5、25、37.5和50 cm四种不同的床高，在流速为0.025 L min⁻¹的穿透时间分别处理了5.25、19.50、35.25和51 L原始纺织废水。根据不同柱变量，采用床层深度服务时间（BDST）方法评估了理论服务时间。发现交换区高度的计算值和理论值相差27%。在不同床高下，固定床实验研究获得的各种设计参数与相应理论值显示出良好的相关性。还使用由30 g L⁻¹ NaCl和1.5 g L⁻¹ NaOH组成的溶液在pH值为12和温度为30℃的条件下对SMZ的再生进行了评估。与其他情况相比，二次再生的SMZ表现最佳，而一次和三次再生的性能低于原始SMZ。
