TiCl4混凝劑去除有機物與無機物及實場應用可行性之研究

Study of TiCl4 on Coagulation of Organic and Inorganic Matters and Field Application

康婷瑋(Ting-Wei Kang)

指導教授 ： 駱尚廉

國立臺灣大學/工學院/環境工程學研究所/碩士(2016年)

https://doi.org/10.6342/NTU201600596

摘要

無資料

關鍵字

四氯化鈦 ； 混凝膠凝 ； 垃圾滲出水 ； 二氧化鈦

並列摘要

This study aimed to use titanium tetrachloride (TiCl4) as coagulant to remove humic acid (HA) and kaolinite which represent organic matters and inorganic matters, respectively. The efficiency of coagulation for five target parameters (turbidity, colority, UV254, COD, and TOC) were employed and considered in this study. Moreover, the leachate withdrawn from Sanjuku Landfill located in Taipei, Taiwan was tested with TiCl4. After coagulation process, the sludge was dehydrated in an oven overnight at 105℃, and then calcined at a final temperature of 550℃ to produce HA-TiO2 (HA: humic acid) and LC-TiO2 (LC: leachate). These photocatalysts were characterized in terms of SEM, EDS, XRD, UV/Vis.-DRS and XPS. The assessment of the catalytic activity was performed by photocatalysis of acid green 25 (AG 25) dye.
The optimum conditions were found to be 61 mg/L TiCl4 and pH ≤ 11 for 100 ppm HA. On the other hands, kaolinite (100-1000 mg/L) cannot be removed after coagulation-flocculation process due to the low pH value resulted from TiCl4 hydrolysis. However, when HA and kaolinite coexisted, kaolinite can be well removed from the flocs during the adsorption/sweep coagulation process. In addition, the zeta potential showed that the sludge after coagulation process is close to zero.
When adding 1.12 g/L coagulant into leachate, and the colority, UV254, COD, and TOC removals at 1.12 g/L TiCl4 were 60%, 50%, 55%, and 20%, respectively. The UV254/DOC value of leachate withdrawn from Sanjuku Landfill is 1.18 L/mg-m. It clearly showed that the organic matters in the leachate were difficult to be removed by coagulation-flocculation process and resulted to the low TOC removals.
In photocatalyst characteristic analysis, in terms of the particle size, shape, and crystal structures of HA-TiO2 was similar to P25, and the redshift phenomenon of the former was found by UV/Vis.- DRS. Nevertheless, only the particle size and shape were found similar to P25 from LC-TiO2. The crystal structures were quite different from P25 and even brookites phase were showed. Eventually, the results showed that AG 25 can be removed from photocatalytic reaction with HA-TiO2 and the degradation and mineralization rate were 25% and 20%, respectively.

並列關鍵字

Coagulation and flocculation ； Leachate ； Titanium dioxide ； Titanium tetrachloride

參考文獻

9. Ait Ramdane-Terbouche, C., Terbouche, A., Djebbar, S., and Hauchard, D. (2014). "Electrochemical sensors using modified electrodes based on copper complexes formed with Algerian humic acid modified with ethylenediamine or triethylenetetramine for determination of nitrite in water." Talanta, 119, 214-225.

10. Arnal, P., Corriu, R. J., Leclercq, D., Mutin, P. H., and Vioux, A. (1996). "Preparation of anatase, brookite and rutile at low temperature by non-hydrolytic sol–gel methods." Journal of Materials Chemistry, 6(12), 1925-1932.

11. Asahi, R., Morikawa, T., Ohwaki, T., Aoki, K., and Taga, Y. (2001). "Visible-light photocatalysis in nitrogen-doped titanium oxides." science, 293(5528), 269-271.

12. Asilian, H., Rezaei, A., Mortazavi, S., and Khavanin, A. (2006). "The removal of color and COD from wastewater containing water base color by coagulation process." International Journal of Environmental Science & Technology, 3(2), 153-157.

13. Aziz, H. A., Alias, S., Adlan, M. N., Faridah, Asaari, A. H., and Zahari, M. S. (2007). "Colour removal from landfill leachate by coagulation and flocculation processes." Bioresource technology, 98(1), 218-220.