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An improved method for water treatment which comprises subjecting a water to be containing a hazardous material such as a dioxin or PCB to an ozone treatment contacting the water with fine bubbles of ozone having an average diameter of 0.5 to 3 microns; and a combination of the ozone treatment with

An improved method for water treatment which comprises subjecting a water to be containing a hazardous material such as a dioxin or PCB to an ozone treatment contacting the water with fine bubbles of ozone having an average diameter of 0.5 to 3 microns; and a combination of the ozone treatment with one or more of a hydrogen peroxide treatment, a UV radiation treatment, an electrolysis treatment and a treatment with a carbonaceous filter material. The above ozone treatment or combination of treatments can be used for surer realization on of an intended effect of a water treatment, which is difficult to achieve by the use of a conventional method wherein ozone or hydrogen peroxide is simply mixed with a water to be treated. In particular, the combination of treatments leads to a more improved effect of water treatment.

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1. An advanced water treatment process for bringing minute bubbles of ozone into contact with water to be treated which contains harmful substances including dioxins and PCB to carry out oxidative destruction of the harmful substances contained in the water to be treated, the advanced water treatmen

1. An advanced water treatment process for bringing minute bubbles of ozone into contact with water to be treated which contains harmful substances including dioxins and PCB to carry out oxidative destruction of the harmful substances contained in the water to be treated, the advanced water treatment process comprising:mixing together ozone generated from an ozone generator and the water to be treated to obtain water to be treated which contains ozone;passing the water to be treated which contains ozone through an ozone bubble-forming device arranged in a water pipe to obtain water to be treated which contains minute bubbles of ozone, bringing the minute bubbles of ozone into contact with the water to be treated;supplying to at least one ozone treatment tank the water to be treated which contains the minute bubbles of ozone; andcarrying out oxidative destruction of the harmful substances in the water to be treated. 2. The advanced water treatment process according to claim 1, wherein the minute bubbles of ozone have an average particle diameter of 0.5 to 3 μm. 3. The advanced water treatment process according to claim 1, wherein the minute bubbles of ozone have an average particle diameter of 20 to 80 μm. 4. The advanced water treatment process according to claim 1, wherein the at least one ozone treatment tank includes a plurality of ozone treatment tanks arranged at respective successive stages, such that waste ozone in a latter-stage one of the ozone treatment tanks is circulated to a former-stage one of the ozone treatment tanks. 5. The advanced water treatment process according to claim 1, wherein prior to an ozone treatment, or posterior to the ozone treatment, a hydrogen peroxide treatment using a hydrogen peroxide solution is carried out for the water to be treated. 6. The advanced water treatment process according to claim 5, wherein prior to the treatment by using the hydrogen peroxide solution, the water to be treated is adjusted to a pH of 8 to 10. 7. The advanced water treatment process according to claim 1, wherein an ultraviolet radiation treatment is carried out for the water to be treated after the ozone treatment, the water containing residual ozone which did not act in the oxidative destruction of the harmful substances. 8. An advanced water treatment process for bringing minute bubbles of ozone into contact with water to be treated, which contains harmful substances including dioxins and PCB, thereby carrying out oxidative destruction of the harmful substances, wherein prior to an ozone treatment, or posterior to the ozone treatment, a treatment by using a hydrogen peroxide solution is carried out for the water to be treated and a foul-odor air generated from the water within a treatment system is formed into minute bubbles such that the minute bubbles of the foul-odor air are mixed into the hydrogen peroxide solution so that the foul-odor air undergoes oxidative destruction. 9. The advanced water treatment process according to claim 8, wherein the minute bubbles of the foul-odor air have an average particle diameter of 0.01 to 0.02 mm. 10. An advanced water treatment process for bringing minute bubbles of ozone into contact with water to be treated which contains harmful substances including dioxins and PCB to carry out oxidative destruction of the harmful substances contained in the water to be treated, the advanced water treatment process comprising:mixing together ozone generated from an ozone generator and the water to be treated to obtain water to be treated which contains ozone;supplying the water to be treated which contains ozone to an ozone treatment tank, the ozone treatment tank having an ozone bubble-forming device provided on its bottom; andsubjecting the water to be treated which contains ozone to a forced convection state within the ozone treatment tank to obtain water to be treated which contains minute bubbles of ozone, bringing the minute bubbles of ozone into contact with th e water to be treated. 11. The advanced water treatment process according to claim 10, wherein the minute bubbles of ozone have an average particle diameter of 10 to 20 μm. 12. The advanced water treatment process according to claim 10, wherein the minute bubbles of ozone have an average particle diameter of 50 to 60 μm. 13. The advanced water treatment process for bringing minute bubbles of ozone into contact with water to be treated, which contains harmful substances including dioxins and PCB, thereby carrying out oxidative destruction of the harmful substances, wherein at least one of gold, copper oxide, and iron oxide is thrown into the water which is to be subjected to the treatment by using the hydrogen peroxide solution, thereby promoting an oxidation treatment by the hydrogen peroxide solution. 14. An advanced water treatment process for bringing minute bubbles of ozone into contact with water to be treated, which contains harmful substances including dioxins and PCB, thereby carrying out oxidative destruction of the harmful substances, wherein prior to the ozone treatment, an electrolysis treatment is carried out for the water to be treated. 15. An advanced water treatment process for bringing minute bubbles of ozone into contact with water to be treated, which contains harmful substances including dioxins and PCB, thereby carrying out oxidative destruction of the harmful substances and irradiating ultraviolet light, wherein irradiating ultraviolet light includes an ultraviolet radiation treatment tank is arranged within a treatment system, the ultraviolet radiation treatment tank having an ultraviolet light source arranged therein and inner walls thereof coated with titanium dioxide, ultraviolet ray is irradiated onto the inner walls to thereby cause a photocatalytic treatment for deodorizing a foul-odor within the ultraviolet radiation treatment tank. 16. An advanced water treatment system for purifying water to be treated which contains harmful substances including dioxins and PCB, the advanced water treatment system comprising:a water pipe through which the water to be treated is introduced into an ozone treatment tank, the water to be treated containing ozone generated by an ozone generator; andthe ozone treatment tank having an ozone bubble-forming device provided on its bottom, in which the water to be treated which contains ozone is subjected to forced convection to generate minute bubbles of ozone, effecting oxidization of the harmful substances contained in the water to be treated. 17. The advanced water treatment system according to claim 16, wherein the ozone supply means forms ozone into minute bubbles having an average particle diameter of 50 to 60 μm. 18. The advanced water treatment system according to claim 16, wherein the ozone supply means forms ozone into minute bubbles having an average particle diameter of 10 to 20 μm. 19. An advanced water treatment system for purifying water to be treated, which contains harmful substances including dioxins and PCB,the advanced water treatment system comprising an ozone treatment tank for bringing minute bubbles of ozone into contact with the water to be treated, thereby carrying out oxidative destruction of the harmful substances, including a hydrogen peroxide solution treatment tank at a water inlet side or a water outlet side of the ozone treatment tank and including foul-odor supply means for forming a foul-odor air generated from the water within the treatment system into minute bubbles such that the minute bubbles of the foul-odor air are mixed into the hydrogen peroxide solution. 20. The advanced water treatment system according to claim 19, wherein the foul-odor supply means causes the minute bubbles of the foul-odor air to have an average particle diameter of 0.01 to 0.02 mm. 21. An advanced water treatment system for purifying water to be treated which contains harmful substances including dioxins and PCB, the advanced water tr eatment system comprising:ozone supplying means for introducing ozone generated by an ozone generator to a water pipe through which the water to be treated passes, supplying minute bubbles of ozone obtained with an ozone bubble-forming device provided in the water pipe; andat least one ozone treatment tank in which oxidation of the harmful substances is effected by using the minute bubbles of ozone that are brought into contact with the water to be treated. 22. The advanced water treatment system according to claim 21, including an ultraviolet radiation treatment tank at an outlet side of the ozone treatment tank, the ultraviolet radiation treatment tank having an ultraviolet light source arranged therein and inner walls thereof coated with titanium dioxide. 23. The advanced water treatment system according to claim 21, wherein the ozone supply means forms ozone into minute bubbles having an average particle diameter of 20 to 80 μm. 24. The advanced water treatment system according to claim 21, wherein the at least one ozone treatment tank includes a plurality of ozone treatment tanks arranged at respective successive stages, such that extra ozone coming up from the water to be treated in a latter-stage one of the ozone treatment tanks is circulated to a former-stage one of the ozone treatment tanks. 25. The advanced water treatment system according to claim 21, including a hydrogen peroxide solution treatment tank at a water inlet side or a water outlet side of the ozone treatment tank. 26. The advanced water treatment system according to claim 21, wherein the ozone supply means forms ozone into minute bubbles having an average particle diameter of 0.5 to 3 μm. 27. An advanced water treatment system for purifying water to be treated, which contains harmful substances including dioxins and PCB,the advanced water treatment system comprising an ozone treatment tank for bringing minute bubbles of ozone into contact with the water to be treated, thereby carrying out oxidative destruction of the harmful substances including an ultraviolet radiation treatment tank at an outlet side of the ozone treatment tank, the ultraviolet radiation treatment tank having an ultraviolet light source arranged therein and inner walls thereof coated with titanium dioxide, wherein the ultraviolet radiation treatment tank has a plurality of partition walls coated with titanium dioxide, the partition walls being arranged such that a distance between adjacent ones thereof is within 30 cm. 28. The advanced water treatment system according to claim 27, wherein the ultraviolet radiation treatment tank has a body in the form of a bottomed hollow cylinder extending vertically, an ultraviolet lamp being arranged in a diametrical center of the body, with the plurality of partition walls having plate surfaces radially extending toward the ultraviolet lamp positioned in the center of the arrangement of partition walls. 29. The advanced water treatment system according to claim 28, including a carbonized filter medium treatment tank arranged at a water outlet side of the ultraviolet radiation treatment tank, the carbonized filter medium treatment tank having a conifer carbonized filter material obtained by carbonizing raw materials of plural kinds of conifer, including cedar, pine, and Japanese cypress (hinoki) at a high temperature range of 800 to 900° C. 30. An advanced water treatment process according for bringing minute bubbles of ozone into contact with water to be treated, which contains harmful substances including dioxins and PCB, thereby carrying out oxidative destruction of the harmful substances, wherein an ultraviolet radiation treatment is carried out for the water to be treated after the ozone treatment, the water containing residual ozone which did not act in the oxidative destruction of the harmful substances and after the ultraviolet radiation treatment, an electrolysis treatment and a carbonized filter medium contact treatment a re carried out for the water to be treated.