JPH1085719A - Liquid treatment method or sensing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display the flow velocity and the status of flow velocity vector of the whole of a water tank in an easily recognizable manner. SOLUTION: The flow velocity value of liquid flowing on gates 5A of an inlet and an outlet of a water tank 1 is found by a velocity sensor 12, and the flow velocity vector is found by the status of whether the height of water levels of both gates is same or the outlet gate side is lower, and the measured flow velocity vector is displayed in bar lines color classified in compliance with the flow velocity values. Therefore, the water flow distribution, the flow velocity distribution and the gas-liquid mixed distribution status in the water tank of a closed water treatment device can be visualized in the real time, and the process maintenance control can be carried out by an operator feeling at rest.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water tank of a water treatment apparatus in a water treatment and sewage treatment plant, and in particular, removes harmful substances by performing an oxidation reaction by diffusing gas bubbles such as ozone and oxygen into treated water. In the water tank, the flow rate value of the treated water and the overall distribution of the flow velocity vector or the mixing with the gas bubbles, that is, the so-called gas-liquid mixing state, can be displayed, so that the operator can not see in the water tank in the past. The present invention relates to a liquid processing method that makes the situation visible.

[0002]

2. Description of the Related Art In a living environment, the use of water is indispensable. Therefore, in a sewage treatment plant, oxygen gas or air is blown to remove harmful substances before being discharged into rivers, and chemical reaction is performed to reduce low organic substances. In addition, since water treatment is a drinking water distribution business at water treatment plants, water treatment equipment is built and operated, such as by injecting ozonized gas to produce safe water that meets water quality standards through a powerful oxidation reaction. ing.

In the ozone treatment apparatus disclosed in JP-A-7-265884, the inside of the ozone reaction tank, that is, the water tank of the water treatment apparatus cannot be seen. , And directly observe the ozone diffused state in the water tank, which was displayed as a black box on the image processing apparatus, and controlled the optimization of the ozonation reaction to achieve economic operation.

[0004]

In a conventional water tank, a transparent window is provided to view the inside of the water tank, an illuminating light is provided inside, and bubbles are observed from outside by a camera. We had to worry about water leaks over time, and we needed to maintain lighting and cameras. In addition, there is a drawback that the entire inside of the aquarium cannot be seen from the viewing angle of the camera. In addition, since the measured flow velocity value, flow velocity vector, bubbles, and the like are displayed by numbers, there is a disadvantage that it takes time to know the overall situation.

An object of the present invention is to provide a water treatment method for displaying the flow velocity and the flow velocity vector of the entire water tank on a display device in an easily viewable manner.

[0006]

A liquid processing method according to the present invention is a water tank having an inlet gate and an outlet gate, wherein a velocity detector detects a flow velocity value of a liquid flowing on the inlet gate, and detects a height of the inlet gate. Is selected as a reference value, a flow velocity vector is determined depending on whether the exit gate is the same as or below the reference value, the water tank is divided into a plurality of meshes in the X direction and the Y direction, and the mesh is determined for each mesh. The flow velocity vector is displayed as a bar line, and the flow velocity value obtained for each mesh is selected as to which color classification in the classification table that is classified by class, and the flow velocity value is classified by color for each mesh. Is to display.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A water treatment apparatus according to the present invention will be described with reference to FIGS.

FIG. 4 is an explanatory diagram of the overall control system of the present invention. The measurement data unit 11 receives the water flow meter 2 at the entrance of the water tank 1 and the numerical data of the speed detector 12 above the entrance gate 5A of the water tank 1. In addition, a water level gauge 13, a water temperature gauge 14, a water quality meter 15, a gas flow meter 9, a pressure gauge 17, and a thermometer 1 of an ozone generator 16 are used to calculate optimum operating conditions.
8. Numerical data of the ozone concentration meter 19 and the exhaust ozone concentration meter 21 of the exhaust ozone device 20 correspond to the measurement data unit 11.
Has been taken into. These numerical data are fetched from the measurement data unit 11 into the arithmetic and control unit 22, and are subjected to calculation processing described later, and are displayed on the display unit 23.
An instruction signal is also issued to the control valves 3a and 3b to adjust the degree of throttle of the control valves 3a and 3b, and the treated water W flows into the water tank.

The data file 24 is a file for storing point items of calculation results and is used for estimating a change, and is used for estimating output result history and prediction trend.

The details of the water tank 1 will be described with reference to FIG. FIG.
FIG. 1 is a cross-sectional explanatory view of a water tank 1 of a water treatment apparatus in a water treatment plant for diffusing ozonized gas.

The water tank 1 has an entrance gate 5A, an intermediate gate 5
B, a water tank 1 having an outlet gate 5C and a connection port 6, wherein an ozone reaction tank 7 and a retention tank 8 are separated by intermediate and outlet gates 5B and 5C. In FIG. 1, the exit gate 5C
Is designed to lower the height of the entrance gate 5A.
The treated water W enters the inflow culvert 4 from the lower left part of the water tank 1 through the water flow meter 2 via the control valve 3B. The treated water W overflowing from the inflow culvert 4 flows over the inlet gate 5A, enters the ozone reactor 7 and collides with the intermediate gate 5B,
The water flows downward, flows upward again through the connection port 6, flows over the exit gate 5C, flows into the retaining tank 8, and is discharged to the right from the lower right side of the water tank 1.

When the height of the entrance gate 5A is higher than the height of the exit gate 5C, the flow velocity vector measures the height of the exit gate 5C with the water level gauge 13, and the measurement data unit 11 to which this measurement value has been input is used to calculate the operation control unit. Enter 22. In the arithmetic control unit 22, the water level measurement value is stored in the storage unit of the arithmetic control unit 22 in advance. The flow velocity vector is determined based on whether the measured water level is an upper side or a lower side based on the reference water level of the arithmetic control unit 22.

On the other hand, when the height of the entrance gate 5A is equal to the height of the exit gate 5C, the flow velocity vector is always θ = 0.
Since this is a degree (horizontal), there is no need to previously store the reference water level and the like in the arithmetic control unit 22 as compared with the case where the heights of both gates are different, and there is an advantage that the arithmetic control unit 22 can reduce the storage capacity.

[0014] Figure 2, control valve 3 only when data (for upsilon ₁ and upsilon ₂ Figure 2) is not equal to the upsilon ₁ and upsilon ₂ of the speed detector 12 of FIG. 3
The opening degree between a and 3b is adjusted, and control is performed such that υ ₁ = υ ₂ depending on the degree of restriction of the amount of treated water.

FIGS. 2 and 3 are a plan view and a sectional view of the water tank 1 devised so that the initial conditions for the calculation can be correctly measured.

In FIG. 2, when the treated water in a plurality of, for example, two water tanks 1 flows into the inflow culvert 4 via the two control valves 3b, the flow velocity distribution is fast at the center and slow at both ends. Since the average flow velocity of the overflow on the entrance gate 5A is between the center and the side of the water tank 1, the measurement point of the velocity detector 12 is ×
If the position is defined as part ₁ or ₂ , the average flow velocity value can be measured.

In FIG. 3, in the sectional view of the water tank 1, when the treated water W is sprinkled from the lower side into the inflow culvert 4, the flow velocity distribution is early in the central part, slow in the end face side, and overflows to the ozone reaction tank 7. Since the water flows, if the measurement point of the speed detector 12 is set between the water surface on the entrance gate 5A and the end of the entrance gate 5A, the flow velocity can be measured accurately.

On the other hand, the ozonized gas passes through a gas flow meter 9 and is diffused into water as fine bubbles from a ceramic (pore diameter: 50 to 60 μm) diffusion tube 10 installed below the ozonation reaction tank 7. You. Since the ozonized gas has a pressure greater than the pressure of the diffuser pipe 10 and the depth of the diffuser water, the ozonized gas is diffused into the water. The ozone bubbles diffused in the water are dissolved in the water and oxidize with organic substances in the water. Unreacted ozonized gas not dissolved in water is
It is rendered harmless by the exhaust ozone device 20 and released into the atmosphere. Here, the oxidation reaction time of the ozonized gas and the treated water in the ozone reaction tank 7 is required to be about 5 minutes, and a residence tank 8 is provided for taking the reaction time of the dissolved ozone for about 5 minutes.

Although the flow of the treated water W in FIG. 1 is macroscopically described by an arrow, when θ = 0, it flows strongly to the right in the horizontal direction and collides with the intermediate gate 5B and becomes downward. The (fast flow) region is large, and the central portion is swirled to become a stagnant flow (slow flow) region. When θ increases downward, the short-circuit flow region moves diagonally rightward. In the ozone reaction tank 7, the ozonized gas diffuses from the air diffuser 10 from below and generates an oxidation reaction with the treated water while floating upward, so that the flow velocity distribution reduces short-circuit flow and stagnant flow, and the ozone reaction The ideal condition is to be uniform in the tank 7.

Next, the case where the flow velocity value, the flow velocity vector, and the number of bubbles in the water tank are obtained will be described.

A speed detector 12 and a water level gauge 13, for example, an ultrasonic measuring instrument are mounted on the water tank ceiling surface 1A of the entrance gate 5A and the exit gate 5C. The measurement values from these detectors and the water level gauge are input to the measurement data unit 11, and are input from the measurement data unit 11 to the arithmetic control unit 22.
The above-described flow velocity value, flow velocity vector, and number of bubbles are obtained by the arithmetic control unit 22 as follows.

That is, the speed detector 12 is installed in the water above the entrance gate to detect a flow velocity value, and a detection signal is input to the arithmetic and control unit 22 through the above-described route. The water level gauge 13 detects whether the water level at the inlet gate 5A is equal to the water level at the outlet gate 5C, or whether the water level at the outlet gate 5C is lower than that at the inlet gate 5A. If they are equal, the flow rate vector is large and the flow velocity vector is parallel. If the flow rate is low, the flow rate vector is low and the flow velocity vector is inclined downward. When the height of the entrance gate is different from the height of the exit gate, the flow velocity vector is
The height of the water level at the exit gate is measured by 2 and the measured value is input to the measurement data unit 11 and is input to the arithmetic and control unit 22 input from the measurement data unit 11.

In the arithmetic and control unit 22, the measured water level is stored in advance in the arithmetic and control unit. The flow velocity vector is determined depending on whether it is above or below the reference water level. And the entrance gate 5
In the configuration in which the height of the exit gate 5C is the same as that of A, since the flow velocity vector is always θ = 0 degrees (horizontal), the reference value and the like are stored in advance in the arithmetic control unit as compared with the case where the heights of both gates are different. There is an advantage that there is no need to place them, and calculations can be performed by the calculation control unit.

Next, the inside of the water tank is divided into a plurality of meshes in the X direction and the Y direction as shown in FIGS.
After inputting the water level value and the amount of ozonized gas to the arithmetic and control unit 22, the following calculation processing is performed.

The equation of motion is ∂ / ∂t (ρa.υb) + ∇. (ρa.υb.υb) = − {pa− {a + Fsa−}. (Pa.υb.υb) + Rsυa (1) where, ρ = density, P = pressure, υ = flow velocity, Fs = transfer momentum per unit volume / time t, Rs = fluid density change rate, a mark is Time average, b is mass-weighted average,
c indicates the amount of change from the weighted average value.

The equation for calculating the law of conservation of mass is as follows: ∂P / ∂t + ∇ (ρa.υb) = Rsa (2) The following equation of motion is established for the bubble of ozonized air. Here, the liquid density is ρf, the particle density is ρp (gas density ρg + fluid added molecular density), the particle diameter is Dp, the drag coefficient is Cd, the particle velocity is Up, the fluid velocity is Uf, the fluctuation velocity is U′f, and the gravitational acceleration is if the the ^{g, πDp 3/6 · (} ρp · ∂Up) / ∂t = πDp 2/4 · [Cd · ρf | Uf-Up | (Uf + U'f-Up)] / 2+ (πDp 3 · ρ · tg) / 6 ... (3 ) (3) expression in the ^{πDp 2/4 · [Cd ·} ρf | Uf-Up |
(Uf + U'f-Up)] / 2 represents the drag component, and (πDp ³ ·
ρ · fg) / 6 represents a buoyancy component.

The equation of motion of the bubble is calculated from the rising speed (buoyancy) of the bubble and the drag. The rising speed of the initial bubbles from the air diffuser 10 is determined experimentally and given. In other words, the measured value of the buoyancy component is the buoyancy rise value of bubbles per second from the air diffuser 10 is indicated by 20 ± 5 cm / sec, and the amount of air diffusion is variable by the control valve 3A. And give it.

These (1) to (3) based on the law of nature
The simultaneous equations of the equations were numerically obtained for each mesh by a digital computer, and the flow velocity vector, flow velocity value, and number of bubbles for each mesh within a certain time were calculated by the arithmetic control unit 22 in FIG.

FIG. 5 is an explanatory diagram of a processing flow showing a basic procedure in the arithmetic control unit 22.

[0030] From the structural drawing of the water tank 1, the shape input (the boundary conditions of uniform scale and water level value) and a plurality of meshes are divided in the XY direction with respect to the cross section, and the shape of the water tank 1 is determined. Establish calculation conditions for mesh input processing.

[0031] The flow rate values υ ₁ and υ _{2 of the} inlet gate 5A are calculated based on the treated water amount (Q) and the ozone gas amount (G) as measured data.
And the water level gauge 13 (△ L), and the flow rate and velocity calculations are performed by the equation of motion (1) by discretizing the equation by a difference method and forming a linear algebraic equation to obtain an iterative solution.

[0032] After calculating the pressure by the difference method of the law of conservation of mass in (2) and obtaining the pressure, the flow velocity vector and the flow velocity value for each mesh are displayed by the display software processing according to the classification table according to the class in FIG. Create data. Here, when the actual measurement data input changes, the change is automatically detected and recalculated.

[0033] Calculate the buoyancy and drag of bubbles, calculate the number of bubbles (bubble concentration) for each mesh from the equation of motion,
The display data is created according to the classification table for each class in FIG.

Next, the result calculated by the arithmetic and control unit 22 is displayed on the display unit 23 in the characteristic diagrams of FIGS.
Pattern recognition made easy.

That is, in the present invention, the flow velocity value and the number of bubbles calculated by the above-described equations (1) to (3) are classified into the vertical axis Y, the horizontal axis X1, and the horizontal axis X2 in FIGS. The relationship with the display is shown, and these characteristic diagrams will be described.

(A). As shown in FIG. 6, the flow velocity value is Y,
Assuming that the classification by color is X1, the following equation holds, and A is X1
And Y are proportional constants.

X1 = AY (4) In this equation, the flow velocity value obtained by calculating the measured value by the speed detector 12 in FIG. 1 by the above-described equation, for example, Y = 0.7 m / s is substituted into the equation (4). , The color indicated by the color on the horizontal axis X1, for example, orange can be obtained. The flow velocity value Y thus obtained
Correspondence with the color-specific classification display X1 is as follows.

(1). Flow velocity (m / s) ⇒ 1.0 m / s to 0.1
0.8 m / s in red based on the flow velocity value range of 8 m / s.
The flow velocity range from 0.6 m / s to 0.6 m / s is 0.6 m / s in orange.
The flow velocity value range of 0.4 m / s is 0.4 m / s to 0.2 in yellow.
The flow velocity range of m / s is from 0.2 m / s to 0.1 m / s in green.
The flow velocity value range of blue is less than 0.1 m / s, and the flow velocity value range of less than 0.1 m / s is purple.

The flow velocity vector measured by the water level gauge 13 can be indicated by a bar Z1 shown in FIG. By following the bar Z1, the flow velocity vector in the water tank can be known, and if the flow velocity values are displayed in different colors, anyone can immediately determine the relationship between the flow velocity values and the flow velocity vectors.

(B). Next, the number of bubbles will be described.

As shown in FIG. 7A, if the numerical value of the number of bubbles is Y and the classification by color is X2 as shown in FIG.
A is a proportional constant between X2 and Y.

X2 = AY (5) By using the numerical value of the number of bubbles as output data and substituting it into the equation (5),
Immediately classified by color. For example, if the number of bubbles Z2 shown in FIG. 9 is Y = 800, the classification by color is X2 = yellow according to the equation (5) as shown in FIG. The correspondence between the other bubble number values and the classification by color is as follows.

(2). Bubble distribution (number of bubbles) ⇒ 2500 pieces ~
Red based on the number of 1500 bubbles, from 1500 to
1000 bubbles in orange 1000 to 500 bubbles in yellow 500 to 300 bubbles in green 300 to 100 bubbles in blue and less than 100 bubbles in purple The display was converted to color according to the classification table according to class.

(3). In order to superimpose and display any one of the above (a) and (b), the display by color of the flow velocity value and the display by color of the number of bubbles are converted to the simultaneous display so that they do not overlap.

The color display of the flow velocity, the rod direction of the flow velocity vector, and the color display of the bubble distribution (the number of bubbles) are described in the display section 23.
Will be displayed. Since the details of the display unit 23 are displayed by FIGS. 8 and 9, anyone can immediately determine the relationship between the flow velocity value, the flow velocity vector, and the number of bubbles as compared with the related art.
Based on this determination result, the arithmetic control unit 22 controls the regulating valves 3A and 3B in accordance with the load at that time, that is, the amount of water consumption, and controls the flow velocity and the number of generated bubbles, thereby performing economical water treatment. It became so.

Next, a similar effect can be obtained by a display method according to the following application as a modification of the present invention.

(1) FIG. 8 shows a method of dividing the water tank 1 into meshes.
With such a structure, mesh division in the three-dimensional direction (XYZ axes) may be performed, and the above-described display may be displayed in three dimensions.
(The situation in the water tank can be understood more precisely.) (2) In the arithmetic control unit 22 in FIG. 2, the conditions of the calculation data unit 11 are manually input as a stand-alone type, and the arithmetic calculation in FIG. 7 is performed. The display of another classification may be output. (It becomes a simple and inexpensive device.) (3) The control valves 3a, 3b in FIG. flow rate value may be set to be υ ₁ = υ _2. (The control is simplified.) (4) FIG. 1 shows an embodiment of a water supply system, but the same method is used for diffusing and diffusing air or oxygen or ozonized gas into the aeration tank of a sewage treatment plant. May be displayed.

(The same display effect is obtained because of the gas-liquid mixed display.) (5) In the above-described color-based classification display, the ozonation reaction between the treated water W and the ozonized gas is substantially proportional to the gas-liquid mixing conditions. The ozonation reaction (absorption rate,
The degree of reduction in organic matter) may be displayed in different colors. (The ozonation reaction can be understood at a glance, and it becomes easier for the operator to grasp the treatment effect.)

[0049]

According to the present invention, although the situation in the water tank of the water treatment apparatus could not be seen in the conventional black box, the amount of treated water, the velocity value and velocity vector of the treated water on the entrance gate, and the ozonation Calculate and process the measured data with the gas diffusion amount as the initial condition, digitize each mesh division, display the flow velocity vector with a bar, and the flow velocity value and the number of bubbles according to the classification table according to class and color. , By displaying by color,
The gas-liquid mixing state in the water tank can be visually determined at a glance.

Further, the flow velocity value of the liquid flowing through the inlet and outlet gates of the water tank is obtained by a speed detector, and the flow velocity vector can be easily detected based on whether the water level of both gates is the same or the outlet gate is low. Can be.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a water tank of a water treatment apparatus shown as an embodiment of the present invention.

FIG. 2 is a plan view when the water tank of FIG. 1 is viewed from above.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory diagram of an overall control system of the water treatment apparatus of FIG.

FIG. 5 is an explanatory diagram of a calculation processing flow in an arithmetic control unit in FIG. 2;

FIG. 6 is an explanatory diagram illustrating a relationship between a flow velocity value and a class-based color classification.

FIG. 7 is an explanatory diagram showing the relationship between the flow velocity value and the classification of the number of bubbles by class and color.

FIG. 8 is an explanatory sectional view showing a flow velocity value in the water tank of FIG. 1 and classification by color according to class;

FIG. 9 is an explanatory sectional view showing the number of bubbles in the water tank of FIG.

[Description of Signs] 1 ... Water tank, 2 ... Water flow meter, 3 ... Control valve, 4 ... Inflow culvert, 5
A: Inlet gate, 5B: Intermediate gate, 5C: Exit gate, 6: Connection port, 7: Ozone reaction tank, 8: Retention tank, 9 ...
Gas flow meter, 10: diffuser tube, 11: measurement data unit, 12: speed detector, 13: water level meter, 14: water temperature meter,
15 water quality meter, 16 ozone generator, 17 pressure gauge, 1
8 thermometer 19 ozone concentration meter 20 exhaust ozone device 21 exhaust ozone concentration meter 22 arithmetic control unit 23
Display unit, 24: Data file, 25: Display unit for each color.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Yamashita 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Kokubu Plant, Hitachi, Ltd. (72) Inventor Shigeo Shiono 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 Inside Kokubu Plant, Hitachi, Ltd.

Claims (5)

[Claims] 1. A water tank having an entrance gate and an exit gate, wherein a velocity detector detects a flow velocity value of a liquid flowing over the entrance gate, selects a height of the entrance gate as a reference value, and sets the exit gate to a reference value. The flow velocity vector is determined depending on whether the flow rate is the same as or below, the water tank is divided into a plurality of meshes in the X direction and the Y direction, and the flow velocity vectors determined for each mesh are displayed by bar lines, and Select which color classification of the classification table that made the flow velocity value obtained in
A liquid processing method, wherein a flow velocity value is displayed by classifying each mesh by color. 2. A water tank having an entrance gate and an exit gate, wherein a velocity detector detects a flow velocity value of a liquid flowing over the entrance gate, selects a height of the entrance gate as a reference value, and sets the exit gate to a reference value. The flow velocity vector is determined depending on whether it is the same as or below, and the water tank is divided into a plurality of meshes in the X direction and the Y direction, and the flow velocity vector determined for each mesh is displayed as a bar line, The difference between the rising speed when the gas bubbles of the injected gas rises and the flow velocity vector in the water tank for each mesh is determined, the number of bubbles in each mesh within a certain time is obtained, and the number of bubbles is classified by class and color. A liquid processing method characterized by selecting which color-specific section belongs to a tabulated section table, and displaying bubbles by classifying by color for each mesh. 3. A measurement value from a flow velocity detector provided in a water tank, a water level meter for detecting a flow velocity vector, and a gas flow meter for detecting air bubbles is inputted to an arithmetic control unit, and the measured value is converted into a numerical value of flow velocity by the arithmetic control unit. , Calculates the flow velocity vector into the deformed bar and bubble numerical values, creates a color classification table corresponding to each of the flow velocity numerical value and the bubble numerical value, and displays the flow velocity numerical value, the bubble numerical value and the rod according to the color classification table on the display unit. 3. The liquid processing method according to claim 1, wherein the line and the line are graphically displayed. 4. The height of the inlet gate in the water tank is made higher than the height of the outlet gate, a velocity detector detects a flow velocity value of the liquid flowing on the inlet gate, and selects the height of the inlet gate as a reference value. A liquid processing detection method, wherein a flow velocity vector is determined based on whether an exit gate is equal to or lower than a reference value, and the flow velocity value and the flow velocity vector are detected. 5. The method according to claim 1, wherein a control valve provided at each inlet of the plurality of water tanks is controlled to make the flow velocity value and the flow velocity vector to each water tank uniform. Liquid treatment method or detection method.