JPH10337582A - Method for sterilization and purification of intake water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed water of high quality in large quantities by diffusing fine ozone gas bubbles into a swirling flow by means of a gas-liquid mixing device so that sterilization is effected in a short time and impurities such as ozonized products are removed to stabilize the quality of water. SOLUTION: The method for sterilization and purification of intake water comprises a primary treatment tank (adjusting tank) 1, a secondary treatment tank (oxidation separation tank) 2, a tertiary treatment tank (ozone mixing sterilization tank) 3, a quaternary treatment tank (foam separation tank) 4, and a quintic treatment tank (water quality adjusting tank) 5. Fine ozone bubbles or a mixture of air and ozone bubbles is diffused into a flow of water, in a whirl, through the treatment tanks 1, 2, 3, 4 and 5 so that contact efficiency and residence time in the whirling water can be made larger, and hence sterilization efficiency for intake water can be improved and separation effects due to fine foams can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sterilizing and purifying water used for fish and shellfish, farming, aquaculture, agricultural use, and the like.

[0002]

2. Description of the Related Art Conventionally, an air diffuser system, an ejector system, and the like are used for sterilization and purification of water used for fish and shellfish, farming, cultivation, agriculture, and the like. When disinfecting and purifying ozone gas by dissolving the ozone gas in water, in the above-described diffuser system and ejector system, bubbles of ozone gas of 2 to 3 mmφ are diffused or pressed into water.

[0003]

As described above, the diameter of bubbles of ozone gas by the diffuser system and the ejector system is as large as 2 to 3 mmφ and the buoyancy is large. Therefore, the residence time in water is short, and Since the surface area is small and the contact area with water is small, the dissolving efficiency of ozone gas in water is low.In the case of simply injecting ozone gas only from a diffuser tube, the temperature of ozone gas rises due to heat of compression, etc.
Furthermore, the diameter of air bubbles increases, dissolving efficiency is low, sterilization and purification are performed over a long period of time, a lot of energy is required, and the waste ozone is discharged to the atmosphere by using a physical filtration material or the like for recovery processing. There was an inconvenience.

The present invention has been made in view of the above circumstances, and improves the contact efficiency by reducing the diameter of ozone gas bubbles to be diffused and injected into water and effectively diffusing the diffusion and injection methods. And during each stage of the water treatment process of several orders, by effectively collecting and reusing the exhausted ozone gas, sterilization and purification with a short time, efficiently and with low energy, It is an object of the present invention to provide a sterilization and purification method for obtaining a large amount of high quality water by reducing fish toxicity such as oxidants due to residual ozone in a treatment process.

[0005]

According to the present invention, in order to achieve the above object, the present invention comprises five processing tanks, from a first processing step to a fifth processing step. The air in the atmosphere and the exhausted ozone gas collected from the secondary processing step are efficiently mixed and sucked by the gas-liquid mixing device, mixed and stirred with the intake water in the gas-liquid mixing device to generate fine air and ozone gas bubbles, Primary processing step and primary processing in which fine air mixed with water intake and ozone gas bubbles are supplied in a vortex form in a tank, and are rotated and diffused to treat exhausted ozone gas, while adjusting dissolved oxygen and removing nitrogen oxides. After the process, ozone gas from the ozone generator is mixed and stirred with water flowing from the primary treatment step in the gas-liquid mixing device to generate fine ozone gas bubbles and provided at an effective angle in the secondary treatment tank. Pre-treatment to oxidize and separate organic and inorganic substances dissolved in the intake water and germicidal foam separation by blowing out and diffusing the diffused plate in a swirl shape to diffuse it. A secondary treatment process, water intake pretreated by the secondary process flows to tertiary treatment processes. The inflowing secondary treatment water and the ozone gas from the ozone generator are blown out to the diffusion plate in the tertiary treatment tank by the gas-liquid mixing device in the same manner as in the secondary treatment step, and are diffused, thereby contacting with fine ozone gas bubbles. Increases the efficiency of flotation and separation by the water flow method, sterilizes bacteria and bacteria in water, and ozone oxidation products and trace components in water are collected by a foam collection plate that is effectively installed in the upper part of the tank. It is discharged to the collection box outside the tank together with the bubbles. The treated water sterilized and purified in the tertiary treatment step is mixed with the exhausted ozone gas generated in the tertiary treatment step in a gas-liquid mixture and stirred. A fourth treatment step for removing products, residual ozone, and waste ozone;
The water that has been sterilized and purified by the next treatment step is filtered, the remaining ozone is removed and adsorbed in the upper part of the water tank, and the water quality is stabilized at the lower part of the water tank, such as adjustment of dissolved oxygen. The gas-liquid mixing device diffuses fine ozone gas bubbles in a vortex, sterilizes in a short time, effectively removes impurities such as ozone oxidation products, stabilizes the water quality, and removes a large amount of high-quality water. Intake disinfection and purification equipment consisting of supplying.

[0006]

[Function] In the primary treatment step of water intake, recovery of inorganic substances and impurities and effective diffusion of fine bubbles from the gas-liquid mixing device by physical filtration action, adjustment of dissolved oxygen, removal of nitrogen oxides, etc. By collecting and using waste ozone gas.
Pre-processing of the next processing step is performed. In the second treatment step, the ozone gas from the ozone generator is made into fine ozone gas bubbles by a gas-liquid mixing device, mixed with water from the first treatment step and supplied to an effectively provided diffusion plate, and diffused in a vortex to form an organic substance. At the same time as performing the oxidative separation of inorganic oxides and inorganic substances, a pretreatment for removing the oxidized and separated ozone oxidation products is performed, and the exhausted ozone gas is sucked and reused by the gas-liquid mixing device in the primary processing step. In the tertiary treatment step, the water treated in the secondary treatment step is sterilized by the vortex diffusion of fine ozone gas to disinfect various bacteria, bacteria, etc. in the water, and at the same time, is discharged together with the fine ozone gas bubbles and the discharged ozone gas to the recovery tower outside the tank. Is done. In the fourth processing step, the ozone oxidation product oxidized and decomposed in the third processing step and the residual ozone are sucked into a gas-liquid mixing device by mixing the air in the atmosphere and the exhausted ozone gas discharged in the third processing step. It is mixed, vortex-supplied to the diffusion plate and diffused, and effectively removed. In the fifth processing step, the air in the atmosphere is mixed and stirred with water from the fourth processing step in the tank by a gas-liquid mixing device. The fine air bubbles are vortex-diffused and diffused into the upper layer inside the tank, and the medium layer is physically filtered, etc. to diffuse and aerate and adsorb residual ozone, to remove oxidants due to ozone oxidation products, etc. At the same time, the dissolved oxygen is adjusted by the fine swirling bubbles in the part, and at the same time, the amount of the physical filter medium is reduced by the backwashing action of the fine bubbles, and the use period is prolonged.

[0007]

FIG. 1 shows a block side view of an apparatus for carrying out the method of the present invention, and FIG. 2 shows a block plan view.
As shown in FIG. 1, water pumped from an intake well or the like enters the primary treatment adjustment tank 1, and the mixed gas of exhausted ozone gas and atmospheric air is swirled into fine bubbles by a gas-liquid mixer 6. It is rotated and diffused to remove contaminants, adjust dissolved oxygen and remove nitrogen oxides, and then sent to the secondary treatment oxidation separation tank.

In the secondary treatment oxidation separation tank 2, ozone gas from the ozone generator, water from the primary treatment adjustment tank 1, and fine bubbles generated by the gas-liquid mixing means 6, and the inside of the secondary treatment oxidation separation tank 2 The organic and inorganic substances dissolved in the water are oxidized and separated by the vortex diffusion tank, and sent to the tertiary treatment ozone mixed sterilization tank 3.

In the tertiary treatment ozone mixing and sterilizing tank 3, the ozone gas from the ozone generator is mixed by the gas-liquid mixing means 6.
The amount of ozone gas sent out to maximize the dissolution efficiency in water and the sterilization efficiency of ozone and the ozone concentration in water by eddy diffusion are adjusted, and organic and inorganic substances are sterilized and organic products are removed at the same time. 4th treatment foam separation tank 4
Sent to

The water which has entered the quaternary treatment foam separation tank 4 mixes and adjusts the ozone gas discharged from the tertiary treatment step 3 with the tertiary treated water and air in the atmosphere.
To adjust the delivery amount of the mixed gas and water, and to effectively diffuse the diffusion in the diffusion section in the fourth processing tank 4, thereby removing ozone oxidation products and removing ozone gas discharged in the third processing step. Performs the processing, and also performs part of the function of the degassing liquid mixing device for residual ozone in water according to the ratio of the amount of air in the mixed gas
It is sent to the fifth treatment water quality adjustment tank 5.

The germicidal purified water sent from the fourth treatment step is supplied to the gas-liquid mixing means by the air in the fifth treatment step 5 and to the upper diffusion part in the fifth treatment tank, and vortex diffusion aeration is performed. To remove residual ozone dissolved in water,
By the physical filtration provided in the middle part of the fifth treatment tank 5, adsorption and filtration of non-air, ozone oxidation products and the like are performed, and the gas-liquid mixing means 6 is diffused by the diffusion part in the lower part of the tank. At the same time as stabilizing the water quality by microbubbles,
Backwashing of the filter medium is performed by the effect of air bubbles floating. And the water which came out of the 5th treatment tank 5 is sent to a farm tank by gravity or a pump.

The fine ozone bubbles diffused into each processing tank by the gas-liquid mixing device 3 will be described with reference to a specific example in comparison with a conventional example. (A) The size of a conventional ozone bubble is “2 to 3 mmφ”,
When the size of the ozone bubble of the present invention is “0.01 mmφ”, (b) When the surface area S and volume P of the conventional ozone bubble are calculated, S = 4πr ² = 4 × 3.14 × (2-3) ² = 50.2
4 to 113.04 mm ² P = 4πr ³ /3=4×3.14×(2 to ³ ) ³ /3=33.49 to 113/0 mm ³ (c) Surface area S and volume P of ozone bubbles of the present invention S = 4πr ² = 4 × 3.14 × (0.01) ² = 0.0
^{1256mm 2 P = 4πr 3 /3=4×3.14×(0.01)} 3/3 = 0.0000041mm 3 (d) the rate of increase in surface area, 50.24 ÷ 0.01256 = 4,000 times 113 .04 ÷ 0.01256 = 9,000 times (e) One ozone bubble of 2 to 3 mmφ is 0.01 mmφ
When the volume of one ozone bubble is compared, N = 33.49 ÷ 0.0000041 = 8,000,000 in the case of 2 mmφ, N = 113.04 ÷ 0.0000041 = 27,000 in the case of 3 mmφ 2,000

As described above, when the ozone bubbles are diffused in water by the gas-liquid mixing device 6,
The surface area increases from 4,000 to 9,000 times and the contact area with water increases remarkably, and the buoyancy is small due to fine bubbles, so that the residence time in water is prolonged. By rotating the water in a rotating manner, the rising angle of the bubbles is directed in the rotation direction to reduce the rising angle of the bubbles, and furthermore, the contact efficiency is increased by the turbulent wave number due to the vortex, and the efficiency is reduced by the reuse of the discharged ozone. It enables short-time sterilization and purification with energy.

[0014]

According to the method of the present invention, fine ozone bubbles or a mixed gas of air and ozone bubbles are diffused in a vortex form in the above-mentioned several water treatment steps together with a water flow.
Contact efficiency and residence time in rotating water are increased, sterilization efficiency of intake water is increased, and separation effect by fine foam is increased, so that sterilization and purification can be performed in a short time, and several water treatment steps A large amount of high-quality water can be produced stably with little energy by using a pretreatment process with high efficiency of sterilization and purification, removal of residual ozone in water, treatment method by effective use of waste ozone, etc. .

[Brief description of the drawings]

FIG. 1 is a side view of a block diagram schematically showing an apparatus for carrying out a sterilization and purification method of the present invention.

FIG. 2 is a block plan view of an apparatus for performing the method of the present invention.

[Explanation of symbols]

 1 Primary treatment tank (adjustment tank) 2 Secondary treatment tank (oxidation separation tank) 3 Tertiary treatment tank (ozone mixing / sterilization tank) 4 4th treatment tank (foam separation tank) 5 5th treatment tank (water quality adjustment tank) Reference Signs List 6 gas-liquid mixing device 7 vortex diffusion part 8 physical filtration part 9 waste ozone supply pipe 10 foam collection part 11 sterilization diffusion part 12 foam separation diffusion part 13 collection tower 14 water quality adjustment part 15 ozone generator 16 inflow pipe 17 outflow pipe 18 send Water pipe 19 Ozone supply pipe

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C02F 1/50 520 C02F 1/50 520A 531 531R 540 540A 550 550B 1/58 1/58 P

Claims (1)

[Claims] 1. The water intake sterilization and purification method of the present invention comprises five treatment tanks from a first treatment step to a fifth treatment step. The air in the atmosphere and the exhausted ozone gas collected from the secondary processing step are efficiently mixed and sucked by the gas-liquid mixing device, mixed and stirred with the intake water in the gas-liquid mixing device to generate fine air and ozone gas bubbles, Primary processing step and primary processing in which fine air mixed with water intake and ozone gas bubbles are supplied in a vortex form in a tank, and are rotated and diffused to treat exhausted ozone gas, while adjusting dissolved oxygen and removing nitrogen oxides. After the process, ozone gas from the ozone generator is mixed and stirred with water flowing from the primary treatment step in the gas-liquid mixing device to generate fine ozone gas bubbles and provided at an effective angle in the secondary treatment tank. Pre-treatment to oxidize and separate organic and inorganic substances dissolved in the intake water and germicidal foam separation by blowing out and diffusing the diffused plate in a swirl shape to diffuse it. A secondary treatment process, water intake pretreated by the secondary process flows to tertiary treatment processes. The inflow of the secondary treatment water and the ozone gas from the ozone generator are blown out from the gas-liquid mixing device to the diffusion plate in the tertiary treatment tank in the same manner as in the secondary treatment step, and are diffused. Enhance efficiency and flotation effect by water flow direction, sterilize bacteria and bacteria in water, ozone oxidation products and trace components in water are collected by a foam collection plate effectively installed in the upper part of the tank, fine It is discharged to the collection box outside the tank together with the bubbles. The treated water sterilized and purified in the tertiary treatment step is subjected to gas-liquid mixing and stirring of the discharged ozone gas generated in the tertiary treatment step.
The fourth treatment step, which mainly removes residual ozone oxidation products, residual ozone, and exhausted ozone in the third treatment step, and the sterilized and purified water from the fourth treatment step by the same treatment method as the next treatment step. Filtering, removing and adsorbing residual ozone in the upper part of the water tank, and adjusting the dissolved oxygen in the lower part of the water tank. Vortex diffusion, sterilization in a short time, effective removal of ozone oxidation product impurities, stabilization of water quality, supply of large quantity of high quality water .