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
  • C02F1/72—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
  • C02F1/30—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
  • C02F1/725—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
  • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2101/00—Nature of the contaminant
  • C02F2101/30—Organic compounds
  • C02F2101/306—Pesticides
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2101/00—Nature of the contaminant
  • C02F2101/30—Organic compounds
  • C02F2101/36—Organic compounds containing halogen
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2301/00—General aspects of water treatment
  • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2303/00—Specific treatment goals
  • C02F2303/04—Disinfection
• • 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
  • C02F2305/02—Specific form of oxidant
  • C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical

Definitions

• the present invention relates to water treatment system and method, more particularly, to water treatment system and method for effectively processing contaminant and pathogenic microorganism by inducing much more generation of hydroxyl radical having strong oxidization through speedy reaction of both ozone and peroxy radical.
• ozone is widely used as an alternative for the suppression of generating tri-halomethane (THM) being a byproduct of chlorine cleaning because of the merits of taste, coagulating sedimentation improvement, biological activity augmentation, and strong oxidization.
• THM tri-halomethane
• Ozone is also known to have the demerits of slow reaction with most of organic materials, such as Geosmin, saturated hydrocarbons of both MIB and THM, and agro- chemicals, or even no reaction with some organic materials. It means the ozone reacts selectively with the organic materials.
• the oxidization of the ozone is much influenced by the processing factors such as pH (potential of hydrogen), temperature and/or mineral under water.
• AOP Advanced Oxidation Process
• the water treatment method using the AOP process is called an improved water treatment technology in which generates a chemical species having both strong sterilizing and oxidization power as an intermediate generating material and processes the organic materials and toxic contaminants containing in water in oxidization.
• the present invention provides a water treatment system and method thereof for inducing the maximization of the generation rate of hydroxyl radical by using ozone/peroxy radical AOP, much increasing the purification efficiency of water by improving the structure for processing efficiency, and inducing the dissolving of the injected ozone by the peroxy radical rapidly within several or a few tens seconds. Therefore, it provides a water treatment system and method thereof in which does not have such a reactor required in the conventional water treatment apparatus or minimizes the size of the reactor.
• a preferred embodiment of the present invention for achieving an objective as described above is characterized that it comprises a water supplier, an oxidation-processing unit both combining with the water supplier and processing water with a hydroxyl radical generated by reaction with either ozone or both the ozone and a peroxy radical, and a peroxy radical generating unit for both generating the peroxy radical through oxygen reacting with titanium dioxide as a catalyst under ultraviolet rays and exhausting the peroxy radical to the oxidation-processing unit.
• the peroxy radical generating unit is a tube form and also a coil type in which spread its some or all portions along the illumination direction of the ultraviolet rays.
• the titanium dioxide is coated into inner wall of the peroxy radical generating unit.
• the peroxy radical generating unit further comprises an inlet being supplied some of dissolved water by connecting to the water supplier.
• At least one of the water supplier and the oxidation-processing unit comprises an ozone supplier supplying ozone.
• At least one of the water supplier and the oxidation-processing unit comprises filter layers converting both non- dissolved and dissolved ozone to minute bubbles.
• the filter layers comprise particle typed active carbon.
• the inlet of the peroxy radical generating unit is connected to a hydrogen peroxide inlet.
• the water supplier, the peroxy radical generating unit and the oxidation-processing unit are all pipe type.
• the inner diameter of the pipe typed peroxy radical generating unit is about 1 ⁇ 10mm.
• the present invention provides a water treatment method processing water by generating a hydroxyl radical through reacting both a peroxy radical and ozone after generating the peroxy radical through oxygen reacting with titanium dioxide as a catalyst under ultraviolet.
• the method generating the hydroxyl radical uses one of the water treatment systems in the Claim 1 through 8.
• Figure 1 is a brief configuration of a water treatment system according to a preferred embodiment of the present invention.
• Figure 2 is a drawing illustrating a peroxy radical generating unit of a water treatment system according to a preferred embodiment of the present invention.
• Figure 3 is a drawing illustrating concentration of the peroxy radical generated by titanium dioxide from ultraviolet rays according to a preferred embodiment of the present invention.
• Figure 4 is a drawing illustrating the concentration of the peroxy radical generated by the injected concentration of hydrogen peroxide according to a preferred embodiment of the present invention.
• Figure 5 is a configuration of a pipe typed water treatment system according to another preferred embodiment of the present invention.
• Figure 6 is a drawing illustrating active carbon filter layers of the water treatment system according to another preferred embodiment of the present invention.
• Figure 7 is a drawing illustrating the degree of dissolving ozone by processing conditions according to a preferred embodiment of the present invention.
• Figure 8 is a drawing illustrating generating degree of hydroxyl radical by processing conditions according to a preferred embodiment of the present invention. Best Mode for Carrying Out the Invention
• the Fig. 1 is a brief configuration of a water treatment system according to a preferred embodiment of the present invention.
• the water treatment system may comprise a water supplier 1, a peroxy radical generating unit 2, an oxidation-processing unit 3, an ozone supplier 4 and an ozone-eliminating unit 5.
• the elements above may not be constrained, but it is preferable to configure the elements to be flexibly connected among them so as to effectively react the reaction solutions flowing in the elements. In other words, it is preferable to perform water treatment in smooth flow of water as being connected the respective elements articulately as shown in the figure.
• the water supplier 1 provides water for processing water treatment.
• the water may not be limited to purified or contaminated water.
• the water supplier 1 may be connected to the oxidation-processing unit 3.
• the water supplier may be connected to both the ozone supplier 4 and the peroxy radical generating unit 2.
• the ozone supplier may be connected to the water supplier before or after the peroxy radical generating unit is connected to the water supplier. It may not be limited.
• the ozone supplier 4, ozone-supplying apparatus may be equipped in at least one of the water supplier and the oxidation-processing unit 3.
• the ozone supplier may be equipped in plural number.
• the peroxy radical generating unit 2 may generate peroxy radical by reacting oxygen with a catalyst of titanium dioxide in the presence of illumination of ultraviolet rays, and drains the peroxy radical to the oxidation-processing unit.
• the generating efficiency of the peroxy radical may be much improved since the peroxy radical is separately generated in the peroxy radical generating unit having a specific configuration.
• the Figure 2 is a drawing illustrating a peroxy radical generating unit 2 of a water treatment system according to a preferred embodiment of the present invention.
• the peroxy radical generating unit may comprise a coil typed tube 23 of a tube in pipe as shown in the figure.
• the coil typed tube 23 may be preferable to spread some or all portions along the illumination direction of the ultraviolet rays so as to improve the efficiency of generating reaction of the peroxy radical.
• the coil typed tube 23 may be configured to more efficiently increase the area to be illuminated by the ultraviolet rays since being the coil type in its appearance.
• the peroxy radical generating unit 2 may further comprise an inlet 21 connecting to the water supplier and being supplied with some of water that oxygen is dissolved, and an outlet 22 exhausting the processed water to a chemical reactor.
• the coil typed tube may not be limited, but be preferable to be a material into which ultraviolet rays penetrates, for example, quartz material.
• the inner diameter of the coil typed tube may be preferable to be 1 ⁇ 10mm.
• the length D of the coil typed tube may be preferable to be 10 ⁇ 20mm, as shown in the Fig. 2, but it may not be restricted.
• the inner diameter of the coil typed tube may be thinner, for example, 1 ⁇ 10mm, because it has a shape of coil to be able to increase the area to be illuminated by ultraviolet rays. In the meantime, since its inner diameter is thinner, the size of the water treatment system may be much reduced.
• the peroxy radical generating unit may further comprise a cooling fan 25 for dropping the generating temperature at reaction in the presence of the ultraviolet rays lamp.
• the water treatment system may perform the reaction for generating the peroxy radical in the inlet or the oxidation-processing unit without separately installing the peroxy radical unit, if necessary.
• the peroxy radical generating unit may generate peroxy radical through photochemical reaction reacting the titanium dioxide with the water containing dissolved oxygen molecules injected through the inlet.
• the generating reaction of the peroxy radical in the peroxy radical generating unit 2 is as follows. As shown in the equation 1 below, the titanium dioxide coated in the coil typed tube 23 reacts to the ultraviolet rays and generates both hole h+ of positive ion, and e- of negative ion. The e- of negative ion combines with the oxygen containing in the water injected from outside and generates peroxy radical, as shown in the equation 2 below.
• Fig. 3 is a drawing illustrating concentration of the peroxy radical generated by titanium dioxide through ultraviolet rays according to a preferred embodiment of the present invention.
• Fig. 3 it shows that the concentration of the peroxy radical generated is abruptly increased as oxygen concentration is increased in water under illuminating the ultraviolet rays since the titanium dioxide is coated, and on the contrary, the concentration of the peroxy radical generated is abruptly decreased under saturated nitrogen gas, namely less oxygen. Therefore, it may be preferable to acquire concentration of sufficiently dissolved oxygen through titanium dioxide under illuminating of the ultraviolet rays.
• FIG 4 is a drawing illustrating the concentration of the peroxy radical generated by the injected concentration of hydrogen peroxide according to a preferred embodiment of the present invention.
• hydrogen peroxide is injected into the coil typed tube coated with the titanium dioxide and the ultraviolet rays is illuminated on the coil typed tube.
• the concentration of the peroxy radical also abruptly increases, as the concentration of the hydrogen peroxide rises up to about 1OmM, and gently increases afterwards. Therefore, it may be preferable to increase the concentration of the hydrogen peroxide for increasing the concentration of the peroxy radical so that the increased peroxy radical can rapidly react with ozone injected.
• the oxidation-processing unit 3 is an apparatus processing water with hydroxyl radical generated through the reaction of either water or ozone with the peroxy radical.
• the oxidation-processing unit 3 is combined with the water supplier for being supplied with water and ozone, and is supplied with the peroxy radical from the peroxy radical generating unit.
• Ozone may be separately supplied by an ozone supplier installed in the oxidation-processing unit.
• the oxidation-processing unit 3 may be preferable to be a pipe typed tube as shown in the Fig. 5. It may be preferable to be configured with a continuous pipe rather than a separated configuration.
• Equation 4 through 6 illustrates generating reaction of hydroxyl radical, and the peroxy radical may generate the hydroxyl radical through a very speedy reaction with ozone.
• Equation 7 is a mathematical equation derived from the equation 4 in case of the reaction of ozone with peroxy radical.
• the speed constant value K o3,o2 - between ozone and peroxy radical is known to 1.52 X 10 M " s " . If it is assumed that 95% of the ozone initially injected is dissolved and the concentration of the peroxy radical is about 0.1 ⁇ 1OnM, the reaction time will be about 0.15 through 10 seconds to dissolve the ozone. It illustrates a very speedy reaction and the hydroxyl radical having strong reaction is generated through the reaction. Moreover, it may prevent any unnecessary instant ozone waste through such a rapid reaction of the ozone and the peroxy radical. In addition, it may also dissolve any dissolved organic materials containing in water through oxidation reaction by using such a strong hydroxyl radical. The ozone utilizing efficiency may be more improved about 20 ⁇ 30 % than the conventional 60%, after passing through the process as above.
• Figure 5 is a plain view of a pipe typed water treatment system according to another preferred embodiment of the present invention.
• the oxidation-processing unit 3 may be preferable to be a pipe typed tube shape as shown in the figure. It may also be preferable to be configured with a continuous pipe rather than a separated configuration.
• the water supplier 1, the peroxy radical generating unit 2 and the oxidation-processing unit 3 are all preferable to be pipe so as to smoothly flow water.
• the oxidation-processing unit 3 may comprise an outlet exhausting the water processed with oxidation. Moreover, it may be preferable to comprise an ozone- eliminating unit 5 by the outlet as shown in the Fig. 1.
• the ozone-eliminating unit 5 removes any ozone remaining in the water to be exhausted.
• the ozone-eliminating unit 5 may be preferable to be made of active carbon in order to remove the remaining ozone after absorption.
• FIG. 6 is a drawing illustrating active carbon filter layers of the water treatment system according to another preferred embodiment of the present invention. It may be preferable to comprise filter layers in at least one of the water supplier and the oxidation-processing unit in which converts both non-dissolved and dissolved ozone to minute bubbles so as to generate the hydroxyl radical more effectively.
• the filter layers 6, as shown, may be preferable to have porosity in numerous units.
• the surface area for reacting ozone is increased so that the hydroxyl radical may be effectively generated.
• the ozone may be absorbed in the active carbon so that the ozone may stay in the oxidation-processing unit longer.
• the generating efficiency of the hydroxyl radical may be improved, and any contaminants absorbed in the active carbon may be removed by the ozone.
• the active carbon may comprise particle typed active carbon.
• the filter layers may be preferable to have a thickness of 10 through 20cm in either the pipe typed oxidation-processing unit or water supplier.
• the active carbon may operate as a catalyst at dissolving ozone so that it may generate the hydroxyl radical effectively.
• Figure 7 is a drawing illustrating the degree of dissolving ozone by processing conditions according to a preferred embodiment of the present invention
• Figure 8 is a drawing illustrating generating degree of hydroxyl radical by processing conditions according to a preferred embodiment of the present invention.
• the water treatment system according to the present invention is much better than ozone independent process in water treatment efficiency.
• the present invention provides a water treatment method in which processes water by generating hydroxyl radical through reacting generated peroxy radical and ozone after oxygen is reacted with titanium dioxide as a catalyst in the presence of ultraviolet rays in order to generate peroxy radical.
• the water treatment method is preferable to use the water treatment system as above. It will omit to illustrate the water treatment method because it is duplicated with the water treatment system.
• the water treatment system and method according to the present invention may improve the generating rate of hydroxyl radical being a strong oxidization material. Therefore, it can not only increase purification efficiency of water, but also minimize the supply of ozone gas. Moreover, it also reduces the size of facility for water treatment apparatus or even does not require any existing apparatus so that it could solve the existing problems requiring excessive plottage and operating expenses.

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• 2005
  • 2005-11-10 KR KR1020050107733A patent/KR100581746B1/ko active IP Right Grant
• 2006
  • 2006-10-16 WO PCT/KR2006/004185 patent/WO2007055476A1/en active Application Filing

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