Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly

2009   Vol. 10   No. 5   p. 732~738

Novel photocatalytic reactor for degradation of DDT in water and its optimization model

Wei-hai PANG¹, Nai-yun GAO^†‡1, Yang DENG², Yu-lin TANG¹

(¹State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China)
(²Department of Civil Engineering and Surveying, University of Puerto Rico at Mayaguez, Mayaguez, PR 00681, USA)
^‡ Corresponding Author
^†E-mail: gaonaiyun@sina.com
Received June 7, 2008; revision accepted Oct. 13, 2008; Crosschecked Feb. 26, 2009

Abstract: A novel photocatalytic reactor was developed to remove (1,1-bis(4-chlorophenyl)-2,2,2-trichloroethane) (DDT) from water. In the reactor, a cenosphere was used to support TiO₂ film made by means of sol-gel. Because the cenospheres were coated with TiO₂, their specific gravity was slightly increased from the original 0.6~0.8 to 0.8~0.9, so that they were able to be suspended in water. With the mixed operation of a bubbler, the water in the reactor was in a well-fluidized state. The bottom of the reactor is a sand filter bed, which can be used to prevent the photocatalyst from being lost. A mathematical model of the reactor has been developed in the two primary influential factors: ultraviolet (UV) light intensity and photocatalyst concentration. With such a model, the reactor can be designed more reasonably.

Key words: Photocatalytic reactor, Persistent organic pollutants (POPs), Reactor model
doi:10.1631/jzus.A0820501             CLC number: X703.3

References:

[1] Boussahel, R., Harik, D., Mammar, M., Lamara-Mohamedl, S., 2007. Degradation of obsolete DDT by Fenton oxidation with zero-valent iron. Desalination, 206(1-3):369-372.

[2] Dalla Villa, R., Nogueira Pupo, R.F., 2006. Oxidation of p,p′-DDT and p,p′-DDE in highly and long-term contaminated soil using Fenton reaction in a slurry system. Science of the Total Environment, 371(1-3):11-18.

[3] Daneshvar, N., Rabbani, M., Modirshahla, N., Behnajady, M.A., 2004. Kinetic modeling of photocatalytic degradation of Acid Red 27 in UV/TiO₂ process. Journal of Photochemistry and Photobiology A Chemistry, 168(1-2): 39-45.

[4] Di Claudio, D., Phani, A.R., Santucci, S., 2007. Enhanced optical properties of sol-gel derived TiO₂ films using microwave irradiation. Optical Materials, 30(2):279-284.

[5] Feng, K., Yu, B.Y., Ge, D.M., Wong, M.H., Wang, X.C., Cao, Z.H., 2003. Organo-chlorine pesticide (DDT and HCH) residues in the Taihu Lake Region and its movement in soil-water system I. Field survey of DDT and HCH residues in ecosystem of the region. Chemosphere, 50(6):683-687.

[6] Fu, J.F., Ji, M., Zhao, Y.Q., Wang, L.Z., 2006. Kinetics of aqueous photocatalytic oxidation of fulvic acids in a photocatalysis-ultrafiltration reactor (PUR). Separation and Purification Technology, 50(1):107-113.

[7] Jang, S.J., Kim, M.S., Kim, B.W., 2005. Photodegradation of DDT with the photodeposited ferric ion on the TiO₂ film. Water Research, 39(10):2178-2188.

[8] Kostedt, W.L., Drwiega, J., Mazyck, D.W., Lee, S.W., Sigmund, W., Wu, C.Y., Chadik, P., 2005. Magnetically agitated photocatalytic reactor for photocatalytic oxidation of aqueous phase organic pollutants. Environmental Science & Technology, 39(20):8052-8056.

[9] Lin, H.F., Valsaraj, K.T., 2006. An optical fiber monolith reactor for photocatalytic wastewater treatment. AIChE Journal, 52(6):2271-2280.

[10] Molinari, R., Pirillo, F., Falco, M., Loddo, V., Palmisano, L., 2004. Photocatalytic degradation of dyes by using a membrane reactor. Chemical Engineering and Processing, 43(9):1103-1114.

[11] Mosteo, R., Ormad, M.P., Ovelleiro, J.L., 2007. Photo-Fenton processes assisted by solar light used as preliminary step to biological treatment applied to winery wastewaters. Water Science and Technology, 56(2):89-94.

[12] Qiu, W., Zheng, Y., 2007. A comprehensive assessment of supported titania photocatalysts in a fluidized bed photoreactor: Photocatalytic activity and adherence stability. Applied Catalysis B: Environmental, 71(3-4): 151-162.

[13] Qiu, X.H., Zhu, T., Yao, B., Hu, J.X., Hu, S.W., 2005. Contribution of dicofol to the current DDT pollution in China. Environmental Science & Technology, 39(12):4385-4390.

[14] Sahle-Demessie, E., Richardson, T., 2000. Cleaning up pesticide contaminated soils: Comparing effectiveness of supercritical fluid extraction with solvent extraction and low temperature thermal desorption. Environmental Technology, 21(4):447-456.

[15] Satapanajaru, T., Anurakpongsatorn, P., Pengthamkeerati, P., 2006. Remediation of DDT-contaminated water and soil by using pretreated iron byproducts from the automotive industry. Journal of Environmental Science and Health Part B-Pesticides Food Contaminants and Agricultural Wastes, 41(8):1291-1303.

[16] Shang, H.L., Zhang, Z.S., Anderson, W.A., 2005. Nonuniform radiation modeling of a corrugated plate photocatalytic reactor. AIChE Journal, 51(7):2024-2033.

[17] Shiraishi, F., Nagano, M., Wang, S.P., 2006. Characterization of a photocatalytic reaction in a continuous-flow recirculation reactor system. Journal of Chemical Technology and Biotechnology, 81(6):1039-1048.

[18] Thetwar, L.K., Sarway, P.K., Gupta, S., Augar, M.R., Tandon, R.C., Dewangan, H.S., Tripathi, N.K., 2007. Concentration, distribution of DDT and Malathion in soil water, plant and fishes in Rajnandgaon, India. Asian Journal of Chemistry, 19(2):1562-1564.

[19] Toor, A.P., Verma, A., Jotshi, C.K., Bajpai, P.K., Singh, V., 2006. Photocatalytic degradation of Direct Yellow 12 dye using UV/TiO₂ in a shallow pond slurry reactor. Dyes and Pigments, 68(1):53-60.

[20] Yoon, B.O., Koyanagi, S., Asano, T., Hara, M., Higuchi, A., 2003. Removal of endocrine disruptors by selective sorption method using polydimethylsiloxane membranes. Journal of Membrane Science, 213(1-2):137-144.

[21] Zhang, L.F., Anderson, W.A., Zhang, Z.S.J., 2006. Development and modeling of a rotating disc photocatalytic reactor for wastewater treatment. Chemical Engineering Journal, 121(2-3):125-134.