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Research Papers

Preliminary Study of the Disinfection of Secondary Wastewater Using a Solar Photolytic-Photocatalytic Reactor

[+] Author and Article Information
Héctor Hernández-García, Héctor López-Arjona, Juan Francisco Rodríguez

Laboratorios de Ingeniería Ambiental, Universidad del Mar, Puerto Ángel, C.P. 70902 Oaxaca, México

Rosario Enríquez1

Laboratorios de Ingeniería Ambiental, Universidad del Mar, Puerto Ángel, C.P. 70902 Oaxaca, Méxicoenriquez@angel.umar.mx

1

Corresponding author.

J. Sol. Energy Eng 130(4), 041004 (Sep 04, 2008) (5 pages) doi:10.1115/1.2969801 History: Received November 13, 2007; Revised November 26, 2007; Published September 04, 2008

Our main purpose was to study the disinfection of a secondary wastewater anaerobic effluent by a combined photolytic-photocatalytic continuous reactor using solar irradiation. This reactor had a rectangular section and included back-and-forth-flow internal channels. It comprised two compartments: the first one (6.4l) corresponded to photolytic disinfection with a 1h residence time and the second one (12.8l) corresponded to photocatalytic disinfection with a 2h residence time. The photocatalyst used was Degussa P-25 TiO2 fixed on an ordinary tile. By use of this reactor between 9:00h and 16:00h with a water flow rate of 3.4lh1, the total coliform concentration diminished by four orders of magnitude, reaching values lower than 102MPN (most probable number)/100ml, which are below the regulation. Even if photolysis was important, this single process did not permit one to obtain an outlet coliform concentration below 103MPN100ml; however, it helped to improve the photocatalytic performance. A decrease in chemical oxygen demand (COD) was also observed in the photocatalytic compartment, illustrating an oxidation of organic pollutants. In parallel, batch experiments were carried out to get information about the residence times, the photocatalytic performance of TiO2 fixed on an ordinary tile, and the photolytic effect. The results suggest that this low cost and easy to operate treatment system could be a promising alternative to usual systems for the decrease in COD and the disinfection of domestic wastewaters.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Picture of the TiO2-coated tile used in the Pho-Pho reactor

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Figure 2

Wastewater treatment system

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Figure 3

Photolytic-photocatalytic reactor for domestic wastewater disinfection. The compartment containing the TiO2-coated tiles is on the right side.

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Figure 4

Inactivation of coliforms (i) without TiO2 (photolysis) and (ii) with TiO2 (photocatalysis)

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Figure 5

Diagrams showing the total coliform removal (in%) in both compartments of the Pho-Pho reactor for each set. τ=3h, Q=3.4lh−1, and varying accumulated energy as indicated.

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Figure 7

COD variations produced by the successive treatments

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Figure 6

Kinetic variations in total coliform and dissolved oxygen through the Pho-Pho reactor for the sets indicated. τ=3h; Q=3.4lh−1.

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