KR20090028750A - Opt method of ozon gas dissolve and the equipment thereof - Google Patents

Abstract

Provided is an ozone contacting apparatus for optimizing dissolution of ozone gas, which can automatically control a discharging rate of a pressure pump corresponding to a change of the amount of ozone gas to be inputted. An ozone contacting apparatus comprises a raw water flowmeter(10), pressure pump(30), injector(40) or T-shaped static mixer, ozone gas flowmeter(50), ozone densitometer(60), ozone dissolver(70), ozone diffuser(80), ozone contacting bath(90), gas-liquid separator(130), waste ozone remover(160), waste ozone gas flowmeter(120), and an automatic controller(170). The raw water flowmeter is installed in a raw water pipe(a).

Description

Optimization method of ozone gas dissolution and ozone contact device using the method

The present invention relates to the advanced treatment of water treatment plant using ozone, and the advanced treatment of sewage / wastewater treatment plant, and more specifically, to automatically maintain ozone gas dissolution rate optimally against changes in raw water quantity, water temperature, and water quality. The present invention relates to an ozone gas dissolution optimization method for controlling and increasing the stability of operation of the ozone remover, and an ozone contact device and an ozone contact point using the method.

Water treatment technology using ozone is widely used for the advanced treatment of waterworks and sewage / wastewater.

It is widely used to remove taste, odor-causing substances and trace harmful substances in advanced treatment of waterworks, and it is widely used to remove hardly decomposable organic substances, colors, odors, etc. in sewage / wastewater.

Ozone is widely used because it does not form a special harmful compound after reaction, its reaction time is short, its decomposition ability is high, and it does not remain in water. However, ozone is itself toxic. It is a difficult substance to treat, not only smelling, smelling headaches, but also threatening health after prolonged exposure.

In addition, ozone is relatively well soluble in water, but reacts sensitively to the pressure, temperature, and water quality of the water to be dissolved. The higher the water temperature, the lower the solubility.

In the past, many acid substrates generating fine bubbles were used as a method of dissolving ozone in water, but now, ozone concentration in ozone gas generated is high due to the generation of high ozone using pure oxygen or liquefied oxygen. As it becomes higher, many side stream systems have been used which have high ozone dissolution rate and convenient maintenance.

However, the conventional side stream system composed of a pressurized pump, an injector, and an ozone dissolving tank has the advantages of being convenient as described above, but has a disadvantage in that a lot of power is required to dissolve ozone in water. There was a problem.

Ozone dissolves well when the water temperature is low, dissolves well when the water temperature is high, dissolves well when the gas-liquid ratio (the ratio of the volume of ozone gas and the dissolved water) is low, and dissolves well when the gas-liquid ratio is high. The ozone dissolving device has a lot of power wasted by operating under the condition of the maximum injection amount and the maximum water temperature.

In addition, the existing ozone contact area has a large change in the overflow head at the outlet of the ozone contact point with respect to the change in the raw water flow rate, and when the exhaust ozone gas in the space above the closed ozone contact tank is compressed, When the gas is released, the operation of the exhaust ozone remover is unstable, and in severe cases, the safety valve is activated, causing the exhaust ozone gas to leak into the building or the atmosphere, threatening the health of workers and killing nearby plants. It was.

In addition, the ozone diffuser pipe is equipped with a spray nozzle outside the main water injector to inject the ozone water, or a large static mixer is installed in the raw water main pipe to mix and diffuse the ozone water and raw water. In the case of a large tube, the mixing and diffusion action is insufficient, the latter case is too complicated and expensive compared to the effect.

Therefore, the ozone dissolution rate of the ozone contact point is measured, the ozone dissolution rate is maintained at the optimum state, while the consumption power required for dissolving the ozone is reduced, and the change in the water level of the efficient and inexpensive ozone diffusion tube and the ozone contact point is reduced. There is a need for measures to increase stability and prevent the release of ozone gas.

The present invention measures the dissolution rate of the ozonized gas (mixed gas of oxygen gas and ozone gas produced in the ozone generator) supplied to the ozone contact point, improves the dissolution rate, minimizes the power consumption required for ozone dissolution, inexpensive and efficient ozone It provides a diffusion tube, improves the operation stability of the exhaust ozone remover, and optimizes the ozone gas dissolution to prevent the release of exhaust ozone gas into the atmosphere from the ozone contact point, and provides the ozone contact device and the ozone contact point using the method. It is.

To this end, the present invention,

An ozone diffusion pipe (80) is installed at the inlet side water supply pipe of the ozone contact tank, and an end of the ozone diffusion pipe is installed to extend the raw water pipe (A) so as to flow into the lower portion of the ozone contact tank (90);

A raw water flow meter 10 is installed at the inlet of the raw water pipe (A), branched from the raw water pipe (A) to the branch pipe 20, and connected to the pressure pump 30;

A branch flow meter 35 is installed in the pressurized pump discharge pipe, and an injector 40 or a T-shaped pipe is installed in the outlet pipe of the branch flow meter;

Ozone gas supplied from an ozone generator (not shown) is supplied to the injector 40 or the T-shaped pipe 46 through a pipe via the ozone gas flow meter 50 and the ozone concentration meter 60;

The ozonated gas supplied from the injector or the T-shaped tube is mixed with the raw water conveyed from the pressure pump, and then ozone of the ozonized gas is completely dissolved in the raw water in the ozone dissolving tank 70;

The ozone water (water in which ozone gas is dissolved in the raw water) completely dissolved in the raw water is supplied to the ozone diffusion pipe 80 installed in series in the raw water pipe, and the raw water and the ozone water are mixed and diluted to an even concentration. A water temperature meter 95 and a residual ozone concentration meter 110 are transferred to the ozone contacting point 90;

The raw water transferred to the ozone contacting point 90 collides with the dispersion plate 90-1 and diffuses around the dispersion plate, so that the ozone water is mixed and diffused again with the raw water, so that the even wall becomes evenly uniform. Passing through the installed ozone contact sheet, reacting with, decomposing and removing tastes, odors and organics;

Ozone gas that is not dissolved in part, gas generated in the reaction process, surplus oxygen gas is transferred to the gas-liquid separator 130 through the exhaust ozone pipe installed in the upper portion of the ozone contact point to remove moisture contained in the exhaust ozone gas, Passes through the exhaust ozone gas concentration meter 120 and the exhaust ozone gas flow meter 140, and is transferred to the exhaust ozone remover 160 by the exhaust ozone tank 150, and the exhaust ozone gas is decomposed into oxygen and discharged into the atmosphere;

By optimizing the overflow weir length and the height of the upper clearance of the ozone contact point, the ozone contact tank is configured so that the amount of exhaust ozone gas does not increase or leak even when the amount of raw water changes.

The measured value signal measured by each measuring instrument is transmitted to the automatic control panel 170 through the communication line 190, and the automatic control panel compares and analyzes the various measured values received, calculates the ozone dissolution rate, and changes the raw water flow rate. In response to the water temperature change and the ozone gas injection amount change, the rotation speed control signal of the pressure pump is transmitted to the inverter 180, and the flow rate is changed through the rotation speed of the pressure pump, whereby the dissolution rate of the ozonation gas is at the highest state. By automatically controlling to maintain the energy consumption, minimizing the power consumption, and setting the optimum change of the overhead head of the weir of the ozone contact point against the change in the amount of raw water, stabilizes the operation of the exhaust ozone remover, An ozone gas dissolution optimization method for preventing the discharge of ozone gas, and an ozone contact device and an ozone contact point using the method are provided.

The present invention is to automatically control the discharge amount of the pressurized pump in response to the change in the amount of raw water, change in water temperature, change in water quality, by maintaining a high ozonated gas dissolution rate and at the same time minimize the power consumption required for ozone dissolution In addition, by improving the economic efficiency and limiting the change of the head current of the ozone contact point within an appropriate value, it is possible to stabilize the operation of the exhaust ozone remover, prevent the leakage of exhaust ozone gas, create a pleasant working environment and protect the surrounding environment.

In the ozone injection and ozone contact device configured as shown in Fig. 1, when raw water flows into the raw water pipe (a), the flow rate signal measured by the raw water flow meter 10 is transmitted to the automatic control panel 170, and in the automatic control panel, The ozone generator is signaled to produce the amount of ozonation gas required to reach a pre-set ozone concentration (eg 2.0 mg / L) (not shown here because it is not within the scope of rights).

When an ozone generator (not shown) produces an ozonated gas having a specific concentration (for example, 11% ozonated gas concentration), its output and ozone concentration are respectively ozonated gas flow meter 50 and ozone concentration meter 60. Is measured and sent to the control panel.

The automatic control panel receives this signal and feeds back and controls the output and concentration of the ozone generator to maintain the ozone generation necessary for the set concentration.

The branching pipe 20 is branched from the raw water pipe (A) and connected to the pressure pump 30, and the injector 40 is connected to the pressure pump discharge pipe, and the ozonated gas pipe is sucked to suck the ozonated gas from the injector. The method of connecting the ozone dissolving tank 70 to the rear end of the injector and connecting the ozone diffusing pipe 80 installed in series to the raw water pipe at the rear end of the ozone dissolving tank is called a side steam method. When gas is used, the dissolution rate of ozonated gas is high and the flow rate required for dissolution is relatively small, and thus it is widely used as an apparatus for dissolving ozonated gas in an advanced treatment facility using ozone in a large capacity water purification plant or a sewage treatment plant.

According to a preferred embodiment, in the side stream method of dissolving 11% concentration of ozonized gas, the discharge amount of the pressurized pump is 5 to 25 of the raw water inflow, the gas-liquid ratio (the volume of ozonized gas and the source to be pumped from the pressure pump). The ratio of water yield is in the range of 8 to 25%, and the ozone dissolution rate is 95% or more, and these values may vary depending on the water quality conditions and the size of the facility.

When a part of the raw water is discharged from the pressurized pump and transferred to the injector 40, the pressure drops at the portion having the small diameter of the injector due to the flow rate, so that ozone gas generated in the ozone generator is sucked in by using this.

Another embodiment is a method of supplying an ozonizing gas to an ozone dissolving tank using a gas compressor without using an injector (see FIG. 2).

In the present embodiment, a T-shaped pipe 45 is provided in the pump discharge side pipe, the ozone gas is press-fitted into the T-shaped pipe by the gas compressor 45, and the ozone gas and the raw water are rapidly mixed in the static mixer 47. Transfer to the ozone dissolution tank 70, or directly to the ozone diffusion pipe (80).

The ozonation gas supplied to the injector or T-shaped tube is dissolved in a vigorous mixture with raw water, and ozoneized while forming a vortex by the cyclone principle while staying in the ozone dissolving tank 70 installed for 0.5 to 2 minutes. Ozone gas in the gas is completely dissolved in the raw water.

As for the pressure of an ozone dissolution tank, 1.5-2 kg / cm <2> is preferable.

89% of the 11% concentration of ozonized gas is oxygen gas, and in the case of running water, since raw water is often saturated with oxygen, most of the oxygen gas other than the supersaturated powder by pressure is not dissolved. It is transferred to the exhaust ozone eliminator through the exhaust valve 76 installed in the upper part of the tank for decomposition.

The ozone water (water dissolved by mixing ozone gas and raw water) completely dissolved in the ozone dissolving tank 70 is transferred to the ozone water diffusion tube 80 so that the raw water and the ozone water are mixed evenly, and the ozone contact sheet 90 As it flows in through the lower part of the body, it becomes more even while colliding with the dispersion plate 90-1, and reacts with the organic material in the raw water, the substance that is a source of smell, and ozone water in contact with each other, and the substances are decomposed and removed by ozone.

If the amount of contaminants such as organic matter is high in the water quality of the raw water introduced into the ozone contact point, and ozone is consumed and the residual ozone concentration is insufficient (the residual ozone concentration is usually in the range of 0.05 to 0.1 mg / L). When the residual ozone concentration value of the residual ozone densitometer 110 installed at the rear end is transmitted to the automatic control panel 170, the automatic control panel performs feedback control to further produce the ozone insufficient in the ozone generator, thereby increasing the ozone yield. As a result, the residual ozone concentration of the ozone contact point is maintained at an appropriate value.

On the contrary, when the residual ozone concentration increases, the ozone generation amount is kept at an appropriate value by reducing the ozone generation amount.

Raw water which has been reacted at the ozone contact point is transferred to the next process and is usually sent to the activated carbon sorbent.

In ozone generators using pure oxygen or liquid oxygen, the ozone concentration is kept constant, and the amount of oxygen gas supplied to the ozone generator is changed to control the amount of ozone generated. In proportion to this, the amount of ozonation gas is also reduced.

In addition, when the amount of raw water decreases, the amount of ozone injected decreases and the amount of ozonated gas generated decreases.

In addition, when the temperature of the raw water is lowered, the ozone solubility is changed as shown in Fig. 8 and the ozone solubility is increased.

In the conventional site stream method, the capacity of the pressure pump is determined and operated on the basis of the highest temperature of the raw water and the maximum amount of ozone injection, so that the temperature of the raw water is lowered, the amount of raw water intake is reduced, When the water quality is clean and the amount of ozone injected is reduced, the amount of dissolved water necessary for dissolving ozone is also reduced. Therefore, if the pressure pump is operated in the same manner, power is wasted by unnecessarily supplying a large amount of dissolved water.

In the present invention, using an automatic control panel and a measuring instrument, when the amount of ozone gas supply decreases, the discharge amount of the pressurized pump is also reduced proportionally, and when the water temperature is lowered, the discharge amount of the pressurized pump is automatically reduced in response to the increased solubility. Operation was made.

The solubility of ozonated gas in water is shown in Equation 1 below.

{Calculation 1}

Where C is the ozone concentration in water (mg / L)

        t: temperature of water ℃

        Y: ozone concentration in ozonation gas (mg / L)

For example, if the maximum water temperature is set to 30 ° C. in a water treatment plant, the ozone solubility at that temperature is 0.232Y, calculated by substituting in Formula 1.

If the solubility of the highest set water temperature is Co and the solubility at any temperature t is Ct, the amount of dissolved water that can obtain the same ozone concentration at any temperature is as shown in Equation 2.

{Calculation 2}

Qt = Qo × Co / Ct

Where Qt: the amount of dissolved water required at any water temperature.

        Qo: The amount of set melt water required at a set water temperature (here 30 ° C).

        Co: The maximum dissolved concentration of ozone in water at a set water temperature (here 30 ° C).

        Ct: maximum dissolved concentration of ozone in water at any water temperature.

In this case, the amount of the set dissolved water should be at least four times the volume of the ozonated gas to maintain the required maximum gas-liquid ratio with respect to the volume of the ozonated gas.

When the amount of ozone injected decreases at the same water temperature, the amount of dissolved water required to maintain the same gas-liquid ratio and dissolve ozone in the water at the same concentration is as shown in Equation 3.

{Calculation 3}

Qn = Qo × On / Oo

Where Qn is the amount of dissolved water required at any ozone injection rate.

        Qo: The amount of set dissolved water required at the maximum ozone injection rate.

        On: Arbitrary ozone gas injection rate

        Oo: Maximum ozone gas injection rate

The amount of dissolved water required at any water temperature and any ozone injection amount is as shown in Equation 4 below.

{Calculation 4}

Qn = Qo × On / Oo × Co / Ct

In the automatic control panel, using the measurement signal received from each measuring instrument installed in the field, the rotation speed of the pressurized pump 30 is automatically supplied to supply the dissolution water of an appropriate value necessary for dissolving ozonated gas through the calculation of Equation 4. To control the discharge volume.

By doing this, the power consumed for dissolving the ozonized gas can be minimized without lowering the dissolution rate of the ozonized gas.

When dissolving ozone in the ozone dissolving tank 70, it is important that in the ozone dissolving tank, strong stirring or vortex should be generated, and sufficient residence time and pressure must be secured for ozone dissolving.

In the present invention, even when the amount of dissolved ozonated gas is reduced, in order to maintain the required pressure (1.5-2 kg / cm 2) in the dissolution tank, the back pressure valve 78 set to the pressure required at the outlet of the ozone dissolution tank is provided. In order to prevent the agitation force from decreasing in the ozone dissolution tank when the amount of ozonated gas dissolved water decreases, a circulation pump 73 is installed and an injection pipe 75 is installed on the discharge side of the circulation pump. By discharging the circulating water, it promotes dissolution of ozonated gas and reduces the ozone concentration in the discharged ozonated gas. The circulating pump is configured to automatically operate when ozone dissolved water decreases below a certain value. .

The ozone water in which ozone is completely dissolved in the ozone dissolving tank should be mixed and diffused well with the raw water to be diluted to an equal concentration to maximize the effect of the ozone reaction. In the present invention, in order to effectively mix and diffuse the ozone water and raw water, ozone diffusion In the pipe 80, a plurality of circular or quadrangular vertical vortex rods 80-1 are installed in the vertical direction, and a plurality of ozone water injection holes 80-1a are provided in the vertical vortex rods, so that the ozone water The raw water was injected evenly and the ozone water and the raw water were rapidly mixed and diffused by the vortex generated by the vertical vortex rod.

The frequency of the vortices generated by the vertical vortex rods is shown in Equation 5 below.

{Calculation 5}

Where Fhz: Vortex frequency (times / sec)

        S: Strouhal Number (1.67)

        V: flow rate in the pipe (m / s)

        Hf: Width of vortex rod (m)

According to the equation (5), the faster the tube flow rate, the smaller the vortex rod width, the higher the vortex generation frequency.

Therefore, it can be seen that the installation of several small vortex rods produces more vortices than one wide vortex rod.

A typical basic shape of vortex generation is shown in FIG. 7.

In addition, a plurality of horizontal vortex rods 80-2 are provided in the horizontal direction at the rear of the ozone diffusion tube 80 so that the ozone water and the raw water are completely mixed and diffused by the vortex of the horizontal cross section generated here. At the same time, it was configured to minimize head loss by the ozone diffusion tube (80).

Another embodiment of the horizontal vortex rod (80-2) is provided with a plurality of injection holes in the horizontal vortex rod, the ozonation gas discharged from the exhaust side installed in the upper side of the ozone dissolving tank (mainly oxygen gas) (The majority of them), and disperse them in the raw water through the injection holes, and use the floating force of this gas to promote the mixing in the ozone diffusion tube, and to dissolve some ozone gas contained in the ozonated gas in the raw water. It is to increase the dissolution rate and to lower the ozone concentration in the exhaust ozone gas (see Fig. 6).

In the water treatment plant or sewage treatment plant, the amount of raw water flowing into the ozone contacting zone changes according to the time zone, and when the amount of raw water inflow changes, the overflow head overflowing the overflow weir (100) installed at the rear end of the ozone contacting zone changes. Due to the head change, the exhaust ozone gas (called exhaust ozone gas) is compressed or expanded between the surface of the ozone contact area and the upper slab, which is closed to the upper slab. When compressed, the pressure of the exhaust ozone gas increases, and the amount of exhaust ozone gas increases, exceeding the decomposition capacity of the pyrolysis method or the catalytic decomposition method, and the exhaust ozone eliminator is discharged into the atmosphere without removing some of the exhaust ozone. In severe cases, ozone gas may leak to the atmosphere through safety valves.

Therefore, in order to prevent this improper phenomenon, the change of overhead head should be limited within a certain range.

In order to prevent leakage of the exhaust ozone gas, the ozone contact point is usually maintained at a negative pressure of -50 mm, so it is necessary to limit the pressure in the ozone contact point not to be higher than atmospheric pressure against the expected change of raw water inflow.

If the height from the maximum water surface in the ozone contact area to the lower surface of the upper slab is H, and the height of the change in the amount of overflow head caused by the change of raw water inflow is h, the pressure in the ozone contact area is -50mm order, 963 milligrams, Atmospheric pressure is 1013 millibars, so the relationship shown in Equation 6 below must be established to prevent the release of exhaust ozone.

{Calculation 6}

Where H is the height from the surface of the ozone contact surface to the lower surface of the upper slab.

        h: Permissible change height of the overflow head due to the change of raw water inflow.

       pa: Ozone gas pressure in millibars (millibars)

For example, if the pressure in the ozone contact tank is desired to be 963 millimeters, the allowable change height of the overflow head without exhaust ozone leakage is as follows.

As can be seen from Equation 6, two methods can be used to allow the height of the overflow head allowable change large.

One method is to keep the pressure in the ozone contact area lower by -100mm order, and the other method is to increase the height from the top of the water surface to the upper slab ceiling in the ozone contact area. It can also be used.

In order to keep the height of the overflow head within the allowable value, the length of the overflow weir must be lengthened. Since the overflow weir at the ozone contact point has no effect on the supernatant water quality, it is necessary to install multiple overflow weirs adjacent to a small area. Weir length can be easily secured.

The method for calculating the ozone dissolution rate is as follows.

{Calculation 7}

{Calculation 8}

Where Yo: ozone dissolution rate

        Qo: amount of ozone supplied (g / min)

        Qw: Raw water inflow (㎥ / min)

       Orc: Residual ozone concentration of ozone contact point (g / ㎥)

        Qd: Ozone gas volume (㎥ / min)

        Od: Ozone concentration in exhaust ozone gas (g / ㎥)

        Qa: Ozone gas amount supplied (㎥ / min)

        Oc: Ozone concentration in ozonated gas (g / ㎥)

The automatic control panel 170 receives the measured values transmitted from the respective measuring instruments, calculates the ozone dissolution rate by performing the calculations of Equations 7 and 8, and if the ozone dissolution rate is smaller than the set value, the pressure pump rotates. When the number is increased and higher than the set value, the rotation speed of the pressure pump is decreased to automatically control so that the ozone dissolution rate is always within the set value.

Although the present invention has been described with reference to the drawings, the embodiments of the specific structure have been mainly described, which can be modified and modified innumerable by those skilled in the art, and all such changes and modifications should be construed as being included in the protection scope of the present invention. something to do.

1 is a block diagram of the present invention.

2 is a configuration diagram showing an embodiment of the ozonation gas supply of the present invention,

3 is a block diagram of an ozone dissolution tank of the present invention.

4 is a longitudinal cross-sectional view showing the configuration of the ozone diffusion tube of the present invention.

5 is a cross-sectional view showing the configuration of the vertical vortex rod of the ozone diffusion tube of the present invention.

Figure 6 is a cross-sectional view showing the injection of the exhaust ozone gas in the horizontal vortex rod of the ozone diffusion tube of the present invention.

7 is a conceptual diagram illustrating vortex generation by the vortex rod of the present invention.

8 is a graph showing the change in dissolution concentration with respect to water temperature change of ozone of the present invention.

Claims (7)

An ozone diffusion pipe (80) is installed at the inlet side water supply pipe of the ozone contact tank, and an end of the ozone diffusion pipe is installed to extend the raw water pipe (A) so as to flow into the lower portion of the ozone contact tank (90); A raw water flow meter 10 is installed at the inlet of the raw water pipe (A), branched from the raw water pipe (A) to the branch pipe 20, and connected to the pressure pump 30; A branch flow meter 35 is installed in the pressurized pump discharge pipe, and an injector 40 or a T-shaped pipe is installed in the outlet pipe of the branch flow meter; Ozone gas supplied from an ozone generator (not shown) is supplied to the injector 40 or the T-shaped pipe 46 through a pipe via the ozone gas flow meter 50 and the ozone concentration meter 60; The ozonated gas supplied from the injector or the T-shaped tube is mixed with the raw water conveyed from the pressure pump, and then ozone of the ozonized gas is completely dissolved in the raw water in the ozone dissolving tank 70; The ozone water (water in which ozone gas is dissolved in the raw water) completely dissolved in the raw water is supplied to the ozone diffusion pipe 80 installed in series in the raw water pipe, and the raw water and the ozone water are mixed and diluted to an even concentration. A water temperature meter 95 and a residual ozone concentration meter 110 are transferred to the ozone contacting point 90; The raw water transferred to the ozone contacting point 90 collides with the dispersion plate 90-1 and diffuses around the dispersion plate, so that the ozone water is mixed and diffused again with the raw water, so that the even wall becomes evenly uniform. Passing through the installed ozone contact sheet, reacting with, decomposing and removing tastes, odors and organics; Ozone gas that is not dissolved in part, gas generated in the reaction process, surplus oxygen gas is transferred to the gas-liquid separator 130 through the exhaust ozone pipe installed in the upper portion of the ozone contact point to remove moisture contained in the exhaust ozone gas, Passes through the exhaust ozone gas concentration meter 120 and the exhaust ozone gas flow meter 140, and is transferred to the exhaust ozone remover 160 by the exhaust ozone tank 150, and the exhaust ozone gas is decomposed into oxygen and discharged into the atmosphere; By optimizing the overflow weir length and the height of the upper clearance of the ozone contact point, the ozone contact tank is configured so that the amount of exhaust ozone gas does not increase or leak even when the amount of raw water changes. The measured value signal measured by each measuring instrument is transmitted to the automatic control panel 170 through the communication line 190, and the automatic control panel compares and analyzes the various measured values received, calculates the ozone dissolution rate, and changes the raw water flow rate. In response to the water temperature change and the ozone gas injection amount change, the rotation speed control signal of the pressure pump is transmitted to the inverter 180, and the flow rate is changed through the rotation speed of the pressure pump, whereby the dissolution rate of the ozonation gas is at the highest state. By automatically controlling to maintain the energy consumption, minimizing the power consumption, and setting the optimum change of the overhead head of the weir of the ozone contact point against the change in the amount of raw water, stabilizes the operation of the exhaust ozone remover, Optimization of ozone gas dissolution to prevent ozone gas emissions. The pressure pump (80) according to claim 1, wherein the ozone dissolution rate is calculated by receiving the signals transmitted from the respective measuring instruments in the automatic control panel, and the ozone dissolution rate is calculated by calculating as follows. Ozone gas dissolution optimization method characterized in that the automatic control by increasing or decreasing the number of revolutions.

Where Yo is the ozone dissolution rate, Qo is the amount of ozone supplied (g / min), Qw is the amount of raw water inflow (m 3 / min), Orc is the residual ozone concentration (g / m 3) of the ozone contact point, and Qd is the amount of fold ozone gas (㎥ / Min), Od is the ozone concentration (g / m3) in the exhaust ozone gas, Qa is the amount of ozone gas supplied (m3 / min), Oc is the ozone concentration (g / m3) in the ozonized gas) The method of claim 1, the pressure pump is operated by the following equation for the change in the ozonation gas injection amount, the change in the raw water temperature, supply the required dissolved water, to control the ozone dissolution rate within the set range and to reduce the power consumption Ozone gas dissolution optimization method configured to operate. Qn = Qo × On / Oo × Co / Ct (Where Qn is the amount of dissolved water required at any ozone injection rate, Qo is the amount of dissolved water required at the maximum ozone injection rate, On is any ozone injection rate, and Oo is the maximum ozonation rate). The amount of gas injected, Co is the maximum dissolved concentration of ozone in water at the set water temperature, and Ct is the maximum dissolved concentration of ozone in water at any water temperature.) Including the weir of the length that forms the overflow head within the allowable variation range of the overflow head with respect to the height from the water surface to the slab ceiling obtained using the following equation, and the variation of the inflow raw water, An ozone contact point that improves the ozone reaction efficiency at the ozone contact point, does not leak exhaust ozone into the atmosphere, and changes the amount of exhaust ozone gas less.

(Where H is the height from the surface of the ozone contact surface to the bottom of the upper slab, h is the permissible change height of the overflow head due to the change of raw water inflow, pa is the pressure of ozonation gas in the ozone contact tank in millibars). A raw water flow meter 10 installed in the raw water pipe (A) to measure the amount of raw water flowing in; A branch flow meter 35 connected to the branch pipe 20 branched from the raw water pipe, and measuring a flow rate passing through the branch pipe; A pressurized pump 30 which collects and transfers the amount of raw water required to dissolve ozone in the raw water pipe; An injector 40 or a T-shaped tube 46 and a static mixer 47 which are installed in the discharge-side piping of the pressure pump and suck the ozonized gas and mix them instantaneously; An ozonation gas flow meter 50 and an ozone concentration meter 60 installed at the rear of the ozone generator; Ozone dissolving tank which rapidly mixes and dissolves ozonation gas and raw water inside, is provided with circulating pump 73 and injection pipe 75, and installs back pressure valve 78 to promote solubility to maintain constant pressure. ; An ozone diffusion pipe (80) which mixes ozone water and raw water to have an even ozone concentration, and is installed in series with the raw water pipe (A); At the inlet, a dispersion plate 90-1 for diffusing raw water, a water thermometer 95 for measuring the water temperature, and a residual ozone densitometer 110 for measuring the residual ozone concentration are installed, and the current wall 90-2 and the overflow weir ( An ozone contact sheet 90 provided with 100; A gas-liquid separator 130 for removing moisture from exhaust ozone gas and an exhaust ozone remover 160 for discharging exhaust ozone by pyrolysis or catalyst; A ship ozone gas flow meter 140 for measuring the amount of exhaust ozone gas and a ship ozone gas concentration meter 120 for measuring the ozone concentration in the exhaust ozone gas; And By receiving the measurement signals of the various measuring instruments, the ozone dissolution rate is calculated, and the rotational speed of the pressurized pump is automatically maintained to maintain the ozone dissolution rate within the set range in response to changes in water temperature, ozone gas supply amount, quantity, and water quality. Ozone contact device composed of an automatic control panel 170 to control. The method of claim 5, wherein the ozone diffusion tube 80 is provided with at least one vertical vortex rod having a plurality of ozone water injection holes in the front, and a horizontal vortex rod installed in the horizontal direction at the rear Ozone contactor. The ozone diffusion tube (80) is provided with at least one vertical vortex rod having a plurality of ozone water injection holes in front of the inside thereof, and a horizontal vortex rod having a plurality of exhaust ozone gas injection holes in the horizontal direction at the rear thereof. An ozone contact device comprising a horizontal vortex rod for passing exhaust ozone gas generated in an ozone dissolving tank to dissolve in raw water.

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