WO2003014030A1 - Procede d'elimination de micro-organismes dans de l'eau par une reaction photocatalytique uv-tio2 et reacteur utilise pour eliminer des micro-organismes - Google Patents

Procede d'elimination de micro-organismes dans de l'eau par une reaction photocatalytique uv-tio2 et reacteur utilise pour eliminer des micro-organismes Download PDF

Info

Publication number
WO2003014030A1
WO2003014030A1 PCT/KR2002/001495 KR0201495W WO03014030A1 WO 2003014030 A1 WO2003014030 A1 WO 2003014030A1 KR 0201495 W KR0201495 W KR 0201495W WO 03014030 A1 WO03014030 A1 WO 03014030A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
photocatalytic reactor
reactor
photocatalytic
hydrogen peroxide
Prior art date
Application number
PCT/KR2002/001495
Other languages
English (en)
Inventor
Si Wouk Kim
Jung Kon Kim
Yong-Ho Kim
Young-Sang Lee
Original Assignee
Chosun University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chosun University filed Critical Chosun University
Publication of WO2003014030A1 publication Critical patent/WO2003014030A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C02F1/325—Irradiation devices or lamp constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/002—Grey water, e.g. from clothes washers, showers or dishwashers
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/32—Details relating to UV-irradiation devices
    • C02F2201/322—Lamp arrangement
    • C02F2201/3227—Units with two or more lamps
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/10—Photocatalysts

Definitions

  • the present invention relates generally to water disinfection by photocatalytic reaction. More particularly, the present invention relates to an apparatus for water disinfection and a method of inactivating or destroying microorganisms and organic materials in water using such an apparatus, which comprises the steps of adding hydrogen peroxide into contaminated water, introducing contaminated water added with hydrogen peroxide into a photocatalytic reactor containing photocatalyst- immobilized porous beads, injecting air thereinto, and applying UV radiation thereinto.
  • the excited electrons and the resulting holes may participate in redox processes with H 2 0, OH " , organic materials and O2 in water.
  • the diffused hole (h + VB ) reacts with OH " in water to produce an OH radical (OH-) , or with water molecules (H 2 0) to generate OH- and H + , as well as directly oxidizing organic materials.
  • the electron (e ⁇ CB ) reacts with oxygen in water, producing a superoxide radical (0 2 ⁇ -) .
  • the superoxide radical reacts with water molecules to generate OH-, OH- and oxygen molecules.
  • water contains hydrogen peroxide hydrogen peroxide absorbs UV energy, producing OH-, or reacts with e ⁇ CB or dissolved oxygen to produce OH- .
  • the produced OH radicals (OH-) participate in oxidation of organic materials .
  • the disinfection method employing the photocatalyst Ti0 2 has several drawbacks as follows.
  • Ti0 2 When titanium dioxide in powder form is applied to water containing contaminants, continuous treatment of water with Ti0 2 powder leads to consumption of a great deal of electrical energy for resuspension of Ti0 2 powder, and in addition, the photocatalyst should be recovered from the treated water.
  • Ti0 2 When Ti0 2 is directly coated on UV lamps, the Ti0 2 must be undesirably thrown away along with the lamps at the end of the lifespan of the lamps.
  • the coating operation is very difficult if the reactor is large in its size.
  • the reactor should be heat-treated at over 500 °C, thus limiting materials capable of being used in manufacturing the reactor. Also, when Ti0 2 is immobilized to glass beads, a Ti0 2 film layer is gradually eroded from the surface of glass beads by the continuous water flow.
  • an apparatus comprising a photocatalytic reactor and a method for water disinfection using the apparatus, where contaminated water is disinfected through a procedure of adding hydrogen peroxide to water to be treated, introducing the water added with hydrogen peroxide into the photocatalytic reactor containing photocatalyst-immobilized porous beads, injecting air into the photocatalytic reactor and applying UV radiation into the photocatalytic reactor, make it possible to shorten disinfection running time and increase disinfection efficiency thanks to the introduction of air and hydrogen peroxide, as well as the reactor being capable of being constructed in a small size-, thus allowing its installation in a narrow place, and its being dismantled, thus facilitating its cleaning.
  • an object of the present invention to provide an apparatus for water disinfection, comprising a photocatalytic reactor which contains photocatalyst- immobilized porous beads and is equipped with UV lamps for irradiation of UV and an inlet for injection of air thereinto.
  • FIG. 1 is a sectional view showing the construction of an apparatus for water disinfection according to a primary embodiment of the present invention
  • FIG. 2 is a side view showing a photocatalytic reactor included in the apparatus of the present invention
  • FIG. 3 is a view showing an apparatus for water disinfection with several photocatalytic reactors arranged in parallel in accordance with another embodiment of the present invention
  • FIG. 4 is a photograph showing a Ti0 2 -immobilized bead ;
  • FIGS . 5a and 5b are graphs showing bactericidal activities of Ti0 2 -immobilized porous beads and glass beads, in which viable cell numbers and bactericidal rates (%) versus E. col ⁇ are plotted against time in FIG.
  • FIGS . 6a and 6b are graphs showing bactericidal effect per UV lamp according to the diameter of the photocatalytic reactor viability, in which viable cell numbers and bactericidal rates (%) versus E. coli are plotted against time in FIG. 6a and FIG. 6b, respectively;
  • FIGS. 7a and 7b are graphs in which viable cell numbers and bactericidal rates (%) versus E. coli are plotted against time in FIG. 7a and FIG. 7b, respectively, when air is injected into the photocatalytic reactor;
  • FIG. 8 is a graph showing an effect of concentration of hydrogen peroxide on disinfection efficiency versus E. coli when the photocatalytic reaction occurs, in which bactericidal rates (%) at various concentrations of hydrogen peroxide are plotted against time;
  • FIG. 9 is a graph showing an effect of concentration of hydrogen peroxide on disinfection efficiency versus E . coli when the photocatalytic reaction is not induced, in which bactericidal rates (%) at various concentrations of hydrogen peroxide are plotted against time;
  • FIG. 10 is a graph showing an effect of concentration of hydrogen peroxide on the sprouting of beans
  • FIGS. 11a and lib are graphs in which viable cell numbers of E. coli and bactericidal rates (%) are plotted against time in FIG. 11a and FIG. lib, respectively, when volume of treated water is doubled and photocatalytic reaction is induced;
  • FIGS. 12a and 12b are graphs in which viable cell numbers and bactericidal rates (%) versus bacteria in water used in sprouting of beans are plotted against time;
  • FIGS. 13a and 13b are graphs in which viable cell numbers and fungicidal rates (%) versus fungi in water used in sprouting of beans are plotted against time. *Brief description of the reference number
  • apparatus 10 photocatalytic reactor
  • UV lamp 13 water outlet
  • FIG. 1 shows the construction of an apparatus for water disinfection according to a preferred embodiment of the present invention.
  • the apparatus 100 for water disinfection in which water is disinfected by a photocatalytic reaction, comprises a photocatalytic reactor 10 containing porous beads 11 to which a photocatalyst is immobilized.
  • UV lamps 12 are axially installed in the photocatalytic reactor 10 at regular intervals, such that the lamps 12 are positioned at the center and ends of a cross as best seen in FIG. 2, when being cross-sectioned, whereby OH radicals are generated when the photocatalyst- immobilized porous beads 11 are exposed to UV radiation from the UV lamps 12.
  • An air inlet tube 30 is axially installed at a lower inside portion of the photocatalytic reactor 10, through which air from an air pump 31 is injected to the inside of the photocatalytic reactor 10.
  • a water inlet 14 and a water outlet 13 are provided at a lower part and an upper part of the photocatalytic reactor 10, respectively, and are diagonally located on the housing of the reactor 10 when being sectioned along a longitudinal axis, thus increasing the residence time of water in the photocatalytic reactor 10.
  • a filter 50 for preventing an undesired discharge of the photocatalyst-immobilized porous beads 11 from the reactor 10 is installed in each of the water inlet 14 and the water outlet 13.
  • the housing of the reactor 10 has a sealed structure with inner and outer frames 15 and 16.
  • the inner frame 15 and the outer frame 16 are assembled with each other by a locking means 18 with an O-ring 17 made of rubber sandwiched between the two frames 15 and 16.
  • the inner and outer frames 15 and 16 of the photocatalytic reactor 10 are made of transparent acryl, thus allowing a user to observe the inside of the photocatalytic reactor 10 as well as check for abnormalities and replacement time of the UV lamps 12 with the naked eye.
  • the porous beads 11 can be formed by using photocatalyst-immobilized beads such as muscovite beads or bentonite beads.
  • the porous beads 11 Porous bead made of muscovite is prepared by baking muscovite having high porosity at 800 °C, coating the surface thereof with a photocatalyst, and then heat-treating at 1400 °C .
  • the photocatalyst is Ti0 2 .
  • the photocatalyst- immobilized porous beads 11 are capable of effectively inactivating or destroying microorganisms and organic materials.
  • the porous beads are preferably 6-10 mm in diameter. When being below this range in diameter, the porous beads pack densely together, thus interrupting flow of water in the photocatalytic reactor. In contrast, when the diameter is above the range, the porous beads become diminished in their total surface area, thus reducing disinfection efficiency.
  • the photocatalyst-immobilized porous beads 11 serve as a catalyst in a process for disinfecting water. After the photocatalyst-immobilized porous beads 11 are used several times, microorganisms and organic materials absorbed in the pores of the porous beads 11 can be easily removed through heat treatment, thus allowing their semipermanent use.
  • the photocatalyst-immobilized porous beads 11, which fill the inside of the photocatalytic reactor, are advantageous in comparison with the conventional glass beads coated with a photocatalyst, as follows.
  • the porous beads have excellent absorptivity to microorganisms and organic materials thanks to their porosity, and improved disinfection efficiency due to their large surface area, as well as being semipermanently used.
  • the glass beads have a short life span owing to easy desorption of the photocatalyst, which is caused by continuous water flow.
  • the Ti0 2 -immobilized beads when water disinfection is performed in the photocatalytic reactor using the photocatalyst-immobilized porous beads and the glass beads, with reference to FIGS. 5a and 5b, the Ti0 2 -immobilized beads have greater disinfection ability than the Ti0 2 -coated glass beads.
  • the UV lamps 12 are installed in the photocatalytic reactor 10 at regular intervals, where the intervals between the UV lamps affect disinfection efficiency in contaminated water. Since OH radicals (OH') serving as a powerful oxidant are generated when UV light from the UV lamps 12 is irradiated onto the photocatalyst-immobilized porous beads 11, the UV lamps 12 should be installed in an array allowing all of the porous beads 11 to be exposed to UV radiation. The intervals between the UV lamps 12 may be changed according to the size of the photocatalytic reactor 10.
  • the most efficient disinfection is achieved when the UV lamps 12 are arranged at intervals of 55-80 mm.
  • the intervals between the UV lamps 12 may be modified according to the size of the photocatalytic reactor 10.
  • the electrodes of the UV lamps were disposed in the photocatalytic-reactor, thus UV lamps needed to be covered with expensive quartz, in order to prevent the electrodes of the UV lamps from contacting the water.
  • the UV lamps 12 can be installed without the quartz tube since the electrodes of the UV lamps 12 are projected to the outside of the photocatalytic reactor 10, and allow a complete sealing effect of the reactor 10, thus reducing the cost of materials. Since the inner and outer frames 15 and 16 are made of transparent acryl, the inside of the photocatalytic reactor 10 is visible, thus allowing a user to investigate with the naked eye any abnormality of the lamps 12 and determine time to replace the existing lamps 12 with new ones.
  • the inner and outer frames 15 and 16 are assembled by the locking means 18 to maintain air tightness of the photocatalytic reactor 10.
  • the locking means 18 is loosened as desired, thus facilitating replacement of the UV lamps 12 with new ones only by loosing the locking means 18.
  • the locking means 18 may be selected from among conventional nuts and bolts, and other types of separable locking devices.
  • the air inlet tube 30 is installed at the lower part of the photocatalytic reactor 10.
  • the air inlet tube 30 is finely perforated to prevent its clogging by the porous beads 11 coated with the photocatalyst, and is connected to the air pump 31, which may have a regulator or not, in order to control air pressure.
  • Air from the air pump 31 is introduced into the photocatalytic reactor 10 through the air inlet tube 30, thus increasing the amount of dissolved oxygen in water. Moreover, since the influx of a large volume of air generates a warm current in water and thus increases reaction efficiency of water, it is preferable that the air pump 31 is powerful.
  • the filter 50 made of plastic material is installed in the water inlet 14 and the water outlet 13.
  • the pore size of the filter 50 may vary depending on the size of the porous beads .
  • the apparatus 100 for water disinfection further comprises the water supply tube 21 through which water is injected into the photocatalytic reactor 10, and a UV stabilizing means 40 controlling the operation of the UV lamps 12.
  • the apparatus 100 for water disinfection comprises the photocatalytic reactor 10 including the photocatalyst-immobilized porous beads 11, the UV lamps 12 and the air inlet tube 30.
  • a plurality of photocatalytic reactors 10 may be fabricated in large sizes, or fabricated in small sizes and then arranged in parallel, as shown in FIG. 3.
  • Such fabrications of the photocatalytic reactors in terms of size and array may be modified by those skilled in the art, and the apparatus 100 for water disinfection may be used in disinfecting and then recycling all kinds of water including agricultural water and seawater or fresh water used in aquariums .
  • the method for water disinfection by photocatalytic reaction comprises the steps of: adding hydrogen peroxide to water to be treated; introducing the water added with hydrogen peroxide into the photocatalytic reactor 10 containing the photocatalyst-immobilized porous beads 11; and injecting air into the photocatalytic reactor 10 through the air inlet tube 30, and applying UV radiation into the phptpcatalytic reactor 10 so as to induce the photocatalytic reaction.
  • Water from a first water reservoir 20 flows into the photocatalytic reactor 10 through the water inlet 14 installed at the lower part thereof, circulates therein, and then flows out through the water outlet 13, which is stimulated by a water supply pump 22.
  • Water in the photocatalytic reactor 10 is disinfected by OH radicals, which are produced when UV light is irradiated onto the porous beads 11, and the disinfected water is stored at a second water reservoir 51.
  • a small amount of hydrogen peroxide is added to water in the first water reservoir 20.
  • the concentration of hydrogen peroxide may vary depending on the volume of water, and is preferably 25-50 mg/L, where a minimum amount of hydrogen peroxide is preferably used owing to possible problems in aspects of economy and stability when hydrogen peroxide is applied at a high concentration. As shown in FIG. 8, when water is treated with various concentrations of hydrogen peroxide, disinfection efficiency in water is increased with concentration of hydrogen peroxide, thus shortening time required for water disinfection.
  • sprouting rate is slightly reduced in a concentration of hydrogen peroxide of 50 mg/L, but recovered with the passage of time.
  • total length of bean sprouts is increased with concentration of hydrogen peroxide.
  • Total length of bean sprouts is significantly increased at 500 mg/L of hydrogen peroxide, where a significance level is 5 %.
  • length of hypocotyls There is no significant difference in length of hypocotyls between bean sprouts being grown in water not treated with hydrogen peroxide or treated with hydrogen peroxide at 100 mg/L, but the length of hypocotyls is remarkably increased at 500 mg/L of hydrogen peroxide.
  • length of roots of bean sprouts is increased with addition of hydrogen peroxide.
  • the apparatus 100 for water disinfection comprising the photocatalytic reactor 10 containing the photocatalyst- immoblized porous beads 11, as shown in FIGS. 11a and lib, also shows excellent disinfection efficiency, where initial disinfection efficiency is slightly lower, but recovered in a short period. Besides, treatment of a large amount of water can be achieved using several photocatalytic reactors 10 arranged in parallel.
  • the present invention will be explained in more detail with reference to the following examples in conjunction with the accompanying drawings. However, the following examples are provided only to illustrate the present invention, and the present invention is not limited to them.
  • Optimum conditions for water disinfection were determined using various reactors, and the optimum conditions are as follows. Water disinfection was performed using the photocatalytic reactor 10 having a length of 720 mm and a diameter of 200 mm, Ti0 2 - immobili-zed porous beads 11 of 8 mm in diameter, and the UV lamps 12 emitting the maximum UV light of 39 W at 254 nm, with addition of hydrogen peroxide of 0-75 mg/L and injection of air through the air inlet tube 30 at a rate of 30 L/min.
  • EXPERIMENTAL EXAMPLE 1 Assay for viability of E. coli per UV lamp according to diameter of the photocatalytic reactor
  • the initial cell number of E . coli (7.1xl0 3 cells/ml) was reduced to 375 cells/ml after 1 min, and to 13 cells/ml after 15 min, showing bactericidal efficiency 95 % and 99.8 %, respectively.
  • the initial cell number of E In the photocatalytic reactor 10 of 80 mm in diameter, the initial cell number of E.
  • coli (77.3xl0 3 cells/ml) was reduced to 823 cells/ml after 1 min, and 21 cells/ml after 15 min, showing bactericidal efficiency of 88.6 % and 99.7 %, respectively, where the initial bactericidal activity is lower than that upon using the photocatalytic reactor of 55 mm in diameter, but it was recovered to a level similar to that of the photocatalytic reactor of diameter of 55 mm after 15 min. However, upon using the photocatalytic reactor of 110 mm in diameter, the initial cell number of E.
  • the photocatalytic reactors of 55 mm and 80 mm in diameter supply high disinfection efficiencies, whereas the photocatalytic reactor of 110 mm in diameter gives remarkably low efficiency in disinfection.
  • the most suitable size of the photocatalytic reactor per UV lamp 12 is between 55 mm and 80 mm in diameter.
  • Air was injected into the photocatalytic reactor 10 at a rate of 30 L/min via the air inlet tube 30 using the air pump 31, and viability of E. coli was investigated for 15 min in comparison with that in the case of not injecting air.
  • the results are given in Table 3, below, and FIGS. 7a and 7b.
  • E . coli (9.2xl0 3 cells/ml) was reduced to 203 cells/ml after 1 min, showing bactericidal efficiency of 97.8 %.
  • hydrogen peroxide was added at an amount of 20 mg/L
  • the initial cell number of E . coli (8.5xl0 3 cells/ml) was reduced to 157 cells/ml after 1 min, showing bactericidal efficiency of 98 %, and showing complete bactericidal efficiency after 15 min.
  • hydrogen peroxide was added at an amount of 25 mg/L the initial cell number of E .
  • the amount of water to be treated in the photocatalytic reactor 10 was doubled, along with addition of hydrogen peroxide at amounts of 20, 25, 30 and 50 mg/L as well as injection of air at a rate of 30 L/min using the air pump 31, and viability of E. coli was evaluated for 15 min.
  • the results are given in Table 5, below, and FIG. 11.
  • the initial cell number of E. coli (3.2xl0 4 cells/ml) was reduced to 1.5xl0 4 cells/ml after 1 min, 1.2xl0 4 cells/ml after 2 min, 1.8xl0 3 cells/ml after 5 min, and 37 cells/ml after 15 min, showing bactericidal efficiency of 51 %, 62.3 %, 94.3 % and 99.8 %, respectively.
  • hydrogen peroxide was added at an amount of 20 mg/L, the initial cell number of E.
  • coli (3.8xl0 4 cells/ml) was reduced to l.lxlO 4 cells/ml after 1 min, 7.0xl0 3 cells/ml after 2 min, 1.8xl0 3 cells/ml after 5 min, and 15 cells/ml after 15 min, inactivating 69.3 %, 81.8 %, 95.3 % and 99.9 % of E . coli cells, respectively.
  • hydrogen peroxide was added at an amount of 25 mg/L, the initial cell number of E .
  • E coli (3.1xl0 4 cells/ml) was reduced to 2.2xl0 4 cells/ml after 1 min, 1.5xl0 3 cells/ml after 2 min, and 4 cells/ml after 15 min, showing bactericidal efficiency of 92.8 %, 95.2 % and 99.98 %, respectively.
  • hydrogen peroxide was added at an amount of 30 mg/L
  • the initial cell number of E . coli (3.5xl0 4 cells/ml) was reduced to 1.9xl0 4 cells/ml after 1 min, 82 cells/ml after 5 min, and 2 cells/ml after 15 min, showing bactericidal efficiency of 94.4 %, 99.7 % and 99.99 %, respectively.
  • Water used in sprouting of beans for 4 hours contained bacteria of 4.0xl0 4 cells/ml.
  • Table 6 and FIGS. 12a and 12b when hydrogen peroxide was not added, the initial number of viable bacteria were reduced to 6.8xl0 3 cells/ml after 1 min and 123 cells/ml after 15 min, showing bactericidal efficiency of 82.9 % and 99.7 % , respectively.
  • the number of viable bacteria was increased to 343 cells/ml after 30 min, but reduced again to 220 cells/ml after 90 min, showing bactericidal efficiency of 99.5 %.
  • bactericidal efficiency was found to be 82.6 %, 99.4 %, 99.5 % and 99.9 % after 1, 15, 30 and 90 min, respectively, where the bactericidal efficiency at the initial stages was slightly lower than that upon not adding hydrogen peroxide, but after 90 min, it was increased to a level higher than those upon not adding hydrogen peroxide. Also, no decrease in disinfection efficiency was observed during the disinfection process, although such a phenomenon was observed when not adding hydrogen peroxide.
  • Water used in sprouting of beans for 4 hours contained fungi at l.OxlO 4 cells/ml. As shown in Table 7 and FIG. 13, when hydrogen peroxide was not added, fungicidal efficiency was 69.3 %, 99.6 % and 99.7 %, after 1, 15 and 90 min, respectively. When added at an amount of 25 mg/L, hydrogen peroxide exhibited fungicidal efficiency of 71.1 %, 99.5 % and 99.88 % after 1, 15 and 90 min, respectively. When added at an amount of 50 mg/L, hydrogen peroxide displayed fungicidal efficiency of 90 % and 99.8 % after 1 and 10 min, respectively, and fungi in water were completely inactivated after 15 min. When hydrogen peroxide was added at an amount of 75 mg/L, fungicidal efficiency was found to be 93.7 % after 1 min, and no viable fungi were observed after 4 min.
  • the number of viable bacteria was reduced to 370 cells/ml from 7.2xl0 3 cells/ml after 1 min and 1 cell/ml after 15 min, showing bactericidal efficiency of 95 % and 99.9 %, respectively, indicating that disinfection efficiency of Ti0 2 -immobilized muscovite beads is slightly higher than that of Ti0 2 -coated glass beads.
  • the apparatus for water disinfection makes it possible to shorten time required for water disinfection, and improve disinfection efficiency with addition of hydrogen peroxide and air.
  • the apparatus may be prepared in a small size as desired, thus allowing its installation in a narrow place. Further, the apparatus is easily dismantled, thereby facilitating its cleaning. Therefore, the apparatus for water disinfection is very useful in inactivating or destroying microorganisms and organic contaminants in water.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Physical Water Treatments (AREA)
  • Catalysts (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

La présente invention concerne un procédé qui permet d'éliminer les micro-organismes présents dans de l'eau par une réaction photocatalytique UV-TiO2 et un réacteur utilisé pour éliminer les micro-organismes.
PCT/KR2002/001495 2001-08-06 2002-08-06 Procede d'elimination de micro-organismes dans de l'eau par une reaction photocatalytique uv-tio2 et reacteur utilise pour eliminer des micro-organismes WO2003014030A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2001/47216 2001-08-06
KR10-2001-0047216A KR100439195B1 (ko) 2001-08-06 2001-08-06 광촉매 반응에 의한 용수 살균 방법 및 장치

Publications (1)

Publication Number Publication Date
WO2003014030A1 true WO2003014030A1 (fr) 2003-02-20

Family

ID=19712889

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2002/001495 WO2003014030A1 (fr) 2001-08-06 2002-08-06 Procede d'elimination de micro-organismes dans de l'eau par une reaction photocatalytique uv-tio2 et reacteur utilise pour eliminer des micro-organismes

Country Status (3)

Country Link
KR (1) KR100439195B1 (fr)
CN (1) CN1301917C (fr)
WO (1) WO2003014030A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1686095A1 (fr) * 2005-01-31 2006-08-02 Universidad Católica de la Santisima Concepción Réacteur photocatalytique modulaire et procédé d'oxydation avancée pour la purification et désinfection des effluents d'aquaculture
EP1870379A1 (fr) * 2006-06-23 2007-12-26 Global Engineering and Trade S.p.A. Dispositif de purification de l'eau par un procédé photocatalytique
WO2008050119A1 (fr) * 2006-10-25 2008-05-02 Uvps Environmental Solutions Limited Réacteur photocatalytique
CN102276013A (zh) * 2010-06-08 2011-12-14 鸿富锦精密工业（深圳）有限公司 液体净化装置
US20150158741A1 (en) * 2012-03-21 2015-06-11 Seoul Viosys Co., Ltd. Water purification system using ultraviolet leds
US9394186B2 (en) 2009-11-06 2016-07-19 Universidad Del Valle Photo-catalysis process applied in eliminating recalcitrant compounds in industrial residual waters
CN112062265A (zh) * 2020-09-08 2020-12-11 广西大学 一种光催化和微生物同步降解可吸附有机卤化物中2,4,6-三氯苯酚的方法
GB2591280A (en) * 2020-01-24 2021-07-28 Hydrolize Ltd Filter
CN113600217A (zh) * 2021-07-01 2021-11-05 南京诺兰环境工程技术有限公司 一种新型光催化复合材料的应用
EP4282831A1 (fr) * 2022-05-24 2023-11-29 Zahnen Technik GmbH Installation de traitement d'eau pour la destruction de polluants organiques dans l'eau

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040049470A (ko) * 2002-12-06 2004-06-12 이철호 멸균수 제조 장치
KR100718676B1 (ko) * 2004-11-17 2007-05-18 김태규 광촉매 비드체를 이용한 수질살균정화장치
CN102358635B (zh) * 2011-09-21 2014-01-22 河海大学 一种处理难降解有机物的光电催化装置
WO2013082294A1 (fr) 2011-12-02 2013-06-06 AquaMost, Inc. Appareil et procédé pour traitement de solutions aqueuses et de contaminants dans celles-ci
US8398828B1 (en) 2012-01-06 2013-03-19 AquaMost, Inc. Apparatus and method for treating aqueous solutions and contaminants therein
US9045357B2 (en) 2012-01-06 2015-06-02 AquaMost, Inc. System for reducing contaminants from a photoelectrocatalytic oxidization apparatus through polarity reversal and method of operation
EP2953903A4 (fr) 2013-02-11 2017-01-04 AquaMost, Inc. Appareil et procédé pour le traitement de solutions aqueuses et de contaminants présents dans celles-ci
KR101450261B1 (ko) * 2014-03-03 2014-10-23 (주) 한국환경진단연구소 광촉매 섬유볼 여과장치를 이용한 소규모 수처리 시설의 용수 순환시스템
CN105800845B (zh) * 2016-05-20 2018-05-08 东南大学 紫外条件下的混合催化剂超声雾化有机污水净化系统
CN108545804A (zh) * 2018-05-08 2018-09-18 凡邸（天津）环保科技有限公司 一种基于生物电化学、高级氧化耦合体系杀灭细菌的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0634363A1 (fr) * 1993-07-12 1995-01-18 Ishihara Sangyo Kaisha, Ltd. Photocatalyseur et procédé pour le traitement de l'eau
JPH11221581A (ja) * 1998-02-04 1999-08-17 Aqua Eco Kyodo Kumiai 酸化分解処理装置
EP0997439A2 (fr) * 1998-09-08 2000-05-03 Kabushiki Kaisha Meidensha Procédé et appareil de décomposition d'acide bromique utilisant de photocatalyseurs
KR20000059854A (ko) * 1999-03-09 2000-10-16 이정형 광촉매기술을 이용한 폐수의 질소성분 제거방법
KR20010066710A (ko) * 1999-12-31 2001-07-11 천상석 오존을 이용한 저온 저장고

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2613179B2 (ja) * 1993-07-12 1997-05-21 石原産業株式会社 光触媒体及びそれを用いた水の浄化方法
JP3858326B2 (ja) * 1996-10-15 2006-12-13 株式会社明電舎 オゾンと光触媒を利用した促進酸化処理装置
KR100196745B1 (ko) * 1996-12-19 1999-06-15 이규철 유동형 tio2 코팅 충전물을 이용한 정수처리장치 모듈
KR100205443B1 (ko) * 1996-12-20 1999-07-01 남창우 광촉매를 이용한 폐수처리 장치
KR100242666B1 (ko) * 1997-07-07 2000-02-01 유성용 정수처리 시스템
JPH11156377A (ja) * 1997-11-26 1999-06-15 Meidensha Corp オゾン分解方法とその装置
JP3826580B2 (ja) * 1998-09-08 2006-09-27 株式会社明電舎 光触媒利用の臭素酸分解方法およびその装置
JP4265043B2 (ja) * 1999-08-31 2009-05-20 株式会社Ｉｈｉ 光触媒を用いた水処理方法及び装置
KR20010008265A (ko) * 2000-11-20 2001-02-05 김현용 태양광/자외선/광촉매를 이용한 에너지절약형 광촉매 반응수처리시스템

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0634363A1 (fr) * 1993-07-12 1995-01-18 Ishihara Sangyo Kaisha, Ltd. Photocatalyseur et procédé pour le traitement de l'eau
JPH11221581A (ja) * 1998-02-04 1999-08-17 Aqua Eco Kyodo Kumiai 酸化分解処理装置
EP0997439A2 (fr) * 1998-09-08 2000-05-03 Kabushiki Kaisha Meidensha Procédé et appareil de décomposition d'acide bromique utilisant de photocatalyseurs
KR20000059854A (ko) * 1999-03-09 2000-10-16 이정형 광촉매기술을 이용한 폐수의 질소성분 제거방법
KR20010066710A (ko) * 1999-12-31 2001-07-11 천상석 오존을 이용한 저온 저장고

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1686095A1 (fr) * 2005-01-31 2006-08-02 Universidad Católica de la Santisima Concepción Réacteur photocatalytique modulaire et procédé d'oxydation avancée pour la purification et désinfection des effluents d'aquaculture
EP1870379A1 (fr) * 2006-06-23 2007-12-26 Global Engineering and Trade S.p.A. Dispositif de purification de l'eau par un procédé photocatalytique
WO2008050119A1 (fr) * 2006-10-25 2008-05-02 Uvps Environmental Solutions Limited Réacteur photocatalytique
JP2010507476A (ja) * 2006-10-25 2010-03-11 ユー・ブイ・ピー・エス・エンバイロメンタル・ソリューションズ・リミテッド 光触媒反応器
US8173015B2 (en) 2006-10-25 2012-05-08 Uvps Environmental Solutions Limited Photocatalytic reactor
AU2007310626B2 (en) * 2006-10-25 2012-08-09 Uvps Environmental Solutions Limited Photocatalytic reactor
US9394186B2 (en) 2009-11-06 2016-07-19 Universidad Del Valle Photo-catalysis process applied in eliminating recalcitrant compounds in industrial residual waters
CN102276013A (zh) * 2010-06-08 2011-12-14 鸿富锦精密工业（深圳）有限公司 液体净化装置
CN102276013B (zh) * 2010-06-08 2014-01-22 鸿富锦精密工业（深圳）有限公司 液体净化装置
US20150158741A1 (en) * 2012-03-21 2015-06-11 Seoul Viosys Co., Ltd. Water purification system using ultraviolet leds
US10676375B2 (en) 2012-03-21 2020-06-09 Seoul Viosys Co., Ltd. Water purification system using ultraviolet LEDs
GB2591280A (en) * 2020-01-24 2021-07-28 Hydrolize Ltd Filter
GB2591280B (en) * 2020-01-24 2024-05-15 Hydrolize Ltd Filter
CN112062265A (zh) * 2020-09-08 2020-12-11 广西大学 一种光催化和微生物同步降解可吸附有机卤化物中2,4,6-三氯苯酚的方法
CN113600217A (zh) * 2021-07-01 2021-11-05 南京诺兰环境工程技术有限公司 一种新型光催化复合材料的应用
CN113600217B (zh) * 2021-07-01 2022-04-05 南京诺兰环境工程技术有限公司 一种新型光催化复合材料的应用
EP4282831A1 (fr) * 2022-05-24 2023-11-29 Zahnen Technik GmbH Installation de traitement d'eau pour la destruction de polluants organiques dans l'eau

Also Published As

Publication number Publication date
CN1538939A (zh) 2004-10-20
KR100439195B1 (ko) 2004-07-07
KR20030012956A (ko) 2003-02-14
CN1301917C (zh) 2007-02-28

Similar Documents

Publication Publication Date Title
WO2003014030A1 (fr) Procede d'elimination de micro-organismes dans de l'eau par une reaction photocatalytique uv-tio2 et reacteur utilise pour eliminer des micro-organismes
US6991735B2 (en) Free radical generator and method
CN103384645A (zh) 利用光电催化氧化除去水溶液的污染物的方法
KR101057453B1 (ko) 플라즈마 처리장치
JP5015542B2 (ja) 水浄化装置
US20090152123A1 (en) Methods and Apparatus for Generating Oxidizing Agents
SK7672001A3 (en) Electrolytic apparatus, methods for purification of aqueous solutions and synthesis of chemicals
JP2004143519A (ja) 水処理方法および水処理装置
JP2014514964A (ja) プラズマ水処理装置
KR100805378B1 (ko) 난분해성 폐액처리를 위한 오존-전기분해/반도체촉매복합장치 및 그 사용방법
CA2194657A1 (fr) Reacteur photoelectrochimique
US20050218084A1 (en) Enhanced photocatalytic system
KR20000022991A (ko) 광촉매에 의한 브롬산의 분해방법 및 그 분해장치
KR100621937B1 (ko) 전해 살균기능을 가지는 수처리장치와 이를 통한 살균방법
JP2008302308A (ja) 光触媒及びその製造方法、それを用いた水処理方法及び装置
KR101323258B1 (ko) 플라즈마 살균방법
JP2000325958A (ja) 電気化学的水処理方法
US20130270193A1 (en) Method for water sanitisation
JPH10151453A (ja) 紫外線照射水処理装置及び紫外線ランプ並びにその製造方法
CN217600413U (zh) 紫外光催化降解泳池尿素的装置
KR100439538B1 (ko) 광촉매 살균정화기가 설치된 정수장치
KR102260290B1 (ko) 미세버블 및 자외선을 이용한 수처리 장치
JPH09314149A (ja) 固定床型三次元電極電解槽用ガスケット、固定床型三次元電極電解槽および水処理方法
KR20130132352A (ko) 가변플라즈마장치를 포함하는 농,어업용수 살균장치
KR200326013Y1 (ko) 수처리용 전기장 반응장치

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SL TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BY BZ CA CH CN CO CR CU CZ DE DM DZ EC EE ES FI GB GD GE GH HR HU ID IL IN IS JP KE KG KP KZ LK LR LS LT LU LV MA MD MG MK MW MX MZ NO NZ OM PH PL PT RO SD SE SG SI SK SL TJ TM TN TR TT UA UG US UZ VC VN YU ZA ZM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ UG ZM ZW AM AZ BY KG KZ RU TJ TM AT BE BG CH CY CZ DK EE ES FI FR GB GR IE IT LU MC PT SE SK TR BF BJ CF CG CI GA GN GQ GW ML MR NE SN TD TG

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LU MC NL PT SE SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWE Wipo information: entry into national phase

Ref document number: 20028154770

Country of ref document: CN

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP