Method for killing of microorganism in water by UV-TiO2 photocatalytic reaction and reactor for killing of micro-organisms
A photocatalytic reactor, photocatalytic technology, applied in chemical instruments and methods, physical/chemical process catalysts, special compound water treatment, etc., can solve the problems of difficult coating operation, limited materials, lamp discarding, etc.
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Embodiment 1
[0080] use photocatalytic reactor to carry out the method for water disinfection
[0081] The optimum conditions for water disinfection were determined using various reactors, and the optimum conditions are as follows. Using a photocatalytic reactor 10 with a length of 720 mm and a diameter of 200 mm, a fixed TiO 2 The porous beads 11, and the ultraviolet lamp 12 emitting the maximum ultraviolet light of 39W at 254nm, add 0-75mg / L hydrogen peroxide and inject air through the air inlet pipe 30 at a rate of 30L / min to carry out water disinfection. In all experimental and comparative examples of the present invention, bacteria and fungi were allowed to grow by collecting samples at regular intervals, serially diluting the samples, spreading 100 μl of the final diluted samples on solid medium, and then counting on the medium Colonies grown to assess disinfection efficiency.
[0082] According to the diameter of the photocatalytic reactor, the measurement of the viability of each...
experiment Embodiment 3
[0090] H 2 o 2 The effect of injection on the growth of E. coli
[0091] Hydrogen peroxide was added to the water in the photocatalytic reactor 10 in amounts of 10, 15, 20 and 25 mg / L, air was added at a rate of 30 L / min using the air pump 31, and the viability of Escherichia coli was evaluated for 15 minutes. The results are given in Table 4 and Figure 8 below.
[0092] The number of live E. coli
[0093] As shown in Table 4 and Figure 8, when no hydrogen peroxide was added, the initial cell number of Escherichia coli (7.3×10 3 cells / ml) decreased to 267 cells / ml and 13 cells / ml after 15 minutes, which showed a bactericidal efficiency of 96% and 99.8%, respectively. When hydrogen peroxide was added in an amount of 10 mg / L, the initial cell number of Escherichia coli (7.5×10 3 cells / ml) was reduced to 242 cells / ml, showing a bactericidal efficiency of 96.7%, slightly higher than when hydrogen peroxide was not added, and after 15min, showing a bactericidal effici...
experiment Embodiment 4
[0094] Determination of disinfection efficiency when the volume of treated water is doubled
[0095] The amount of water treated in the photocatalytic reactor 10 was doubled, while hydrogen peroxide was added in amounts of 20, 25, 30 and 50 mg / L, and air was injected at a rate of 30 L / min using an air pump 31 to evaluate the Viability 15min. The results are given in Table 5 and Figure 11 below.
[0096] number of living cells
[0097] As shown in Table 5 and Figure 11, when no hydrogen peroxide was added, the initial cell number of Escherichia coli (3.2×10 4 cells / ml) to 1.5×10 4 cells / ml, after 2 minutes 1.2×10 4 cells / ml, after 5 minutes 1.8×10 3 cells / ml, and 37 cells / ml after 15 minutes, which showed bactericidal efficiencies of 51%, 62.3%, 94.3% and 99.8%, respectively. When hydrogen peroxide was added in an amount of 20mg / L, the initial cell number of Escherichia coli (3.8×10 4 cells / ml) to 1.1×10 4 cells / ml, after 2 minutes 7.0×10 3 cells / ml, after ...
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