JPH05301096A - Method for controlling intermittent air lift device and system therefor - Google Patents

Abstract

PURPOSE:To automatically keep water quantity in the vicinity of set value by comparing the measured water quality value with the preset water quality value and controlling charge of a water-quality improver by difference thereof. CONSTITUTION:When pH of a lake is 4.5, high-concentration line water (pH 9) is continuously injected into the respective pumping devices 2a, 2b, 2c and pH is regulated to 6. In the case of regulating the set value of pH to 6, when the value of a pH sensor reaches 6, output of comparison value 5 is inputted to a controller 9. When a pump 8 of chemicals is stopped, a pumping device 2 performs only circulation of water and pH regulation is stopped. Thereby supply of chemicals to the pumping device 2 unnecessary for pH regulation is automatically stopped. Further, when pH value is lowered, supply of chemicals is restarted. Accordingly, water quality is automatically controlled by comparing the measured value based on the various sensors with the preset value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a management method and a management system for an intermittent air pumping apparatus for detecting the improved state of water quality and managing the operation or stoppage of the intermittent air pumping apparatus.

[0002]

2. Description of the Related Art Conventionally, the amount of dissolved oxygen is improved by an intermittent air pumping device (Japanese Patent Publication No. 3-7440) and the BOD value, COD value, or PH value is improved by using an intermittent air pumping device (JP-A-62-62). No. 6010) was known.

[0003]

The above-mentioned conventional devices have been installed in dams, lakes, swamps, etc. at various places and have achieved great results. However, although the capacity of one of the above-mentioned devices reaches 10,000 to several million tons, it is necessary to temporarily require several to several dozen to improve the water quality of dams, lakes, swamps, etc. with a large amount of water. Is clear. By the way, there are many dams and the like that are actually installed at more than one site. However, depending on the shape of dams, lakes, swamps, etc., the depth of water, etc., it may not be necessary to operate multiple units at all times, or the output may be reduced depending on the season. However, there is a problem in that labor is increased due to an increase in the number of installed bases and control accuracy is improved.

In many areas such as dams, lakes, and swamps, there are no inhabited houses for inconvenient transportation, and it may be difficult to manage the station, and remote management is often desired.

[0005]

SUMMARY OF THE INVENTION However, according to the present invention, various sensors arranged at appropriate positions and predetermined set values are provided.
This enabled automatic control and solved the above-mentioned conventional problems.

That is, the management method of the present invention compares the measured water quality value with a preset water quality value and controls the feeding of pressurized air and / or the feeding of the water quality improving agent based on the difference. This is a characteristic management method for the intermittent air pumping system. The water quality values are the dissolved oxygen content, BOD value, CO
It is a part or all of the D value, PH value, conductivity, chlorophyll a value, turbidity, total phosphorus value, and total nitrogen value. Next, the water quality improving agent is a coagulant, an algicidal agent, a pH adjusting agent, or a part or all of high-concentration oxygen water. Further, the pH adjusting agent is a highly concentrated alkaline water or lime powder.

The management system of the present invention is characterized in that a water quality sensor arranged at an appropriate position is connected to a comparator, and an output of the comparator is connected to a control system of the intermittent air pumping apparatus. Another invention is that the intermittent air pumping is characterized in that the water quality sensor and the pumping in-cylinder flow velocity sensor, which are arranged in appropriate places, are connected to a comparator, and the output of the comparator is connected to the control system of the intermittent air pumping device. It is a device management system. Further, the control system includes a supply amount control means and a pressure control means for the pressurized air and a part or all of the water quality improving agent administration control means.

In each of the above inventions, a water temperature sensor and / or
Alternatively, a surveillance camera can be used.

The high-concentration oxygen water mentioned above is, for example, water in which oxygen is dissolved to near saturation, and the alkaline water is water in which lime is dissolved to near saturation. In addition, examples of flocculants include vanadium sulfate and polymer flocculants, and examples of algaecides include copper sulfate. In any case, it is needless to say that it is used at a concentration that does not adversely affect other than the intended product.

The above-mentioned system can be installed, for example, in a dam, lake / marsh management building, and can be sent by wire or wireless to the permanent residence of the manager (city / town / village manager) if necessary. ..

[0011]

[Embodiment 1] In FIG. 1, a water pumping device 2 (2a,
2b, 2c) are installed appropriately and each pumping device 2a, 2b, 2
The flow velocity sensor 3 (3a, 3b, 3c) is installed in c,
Dissolved oxygen sensor 4 (4a, 4b, 4c,
4d) and a part or all of PH sensor, BOD sensor, COD sensor, algae sensor, etc. are installed. The output of each of the sensors 3 and 4 is connected to the input of the comparator 5. On the other hand, the comparator 5 stores values such as the flow velocity, the amount of dissolved oxygen, and the pH set in advance by the setter 6. Therefore, the set value is compared with the stored value, and the difference is a constant value. When it exceeds the limit, the controller 9 is input, and the output of the controller 9 is input to the compressor 7, the drug pump 8 or the recording / oscillator 10, and the compressor 7 is stopped or the air pressure is controlled, and the drug pump 8 is stopped or supplied. While limiting the amount of delivery,
The state of the automatic device is recorded and reported to the management headquarters 11. The control device 12 includes the comparator 5, the controller 9, the compressor 7, the drug pump 8, and the recording / oscillator 10.
To form.

In the above, each pumping device 2a, 2b, 2
When the pressurized air is fed to the air chamber of c, the pressurized air once stays in the air chamber and is then released as bubbles into the pumping cylinder (for example, released at intervals of about 20 seconds). .. If this discharge time is short, the bubbles discharged from the upper end of the pump will be continuous or nearly continuous (for example, the interval is preferably 5 seconds or more). It rises continuously and mixes with water near the water surface, but the temperature of this mixed water becomes close to the temperature of the bottom water. For example, water surface temperature 2
If the bottom water temperature is 10 ℃ at 0 ℃, the water temperature of the mixed water is 1 ℃.
It will be around 5 ° C. Therefore, the mixed water immediately descends due to the difference in specific gravity, making it difficult to diffuse over a wide range. Therefore, the influence of circulation is 5
It stops in the range of m to 20m. In such a case, the improvement of the dissolved oxygen amount is limited to a small range, and the intended purpose cannot be achieved. Contrary to the above, if the discharge interval is more than 1 minute, the amount of pumped water in the pumping cylinder will be drastically reduced due to the rise of bubbles, and the amount of diffused water will also be small, which also cannot achieve the intended purpose. .. According to the results of the experiment,
The flow velocity in the pump is 0 to 2.0 m / sec. Therefore, if the flow velocity is set to 0.5 m / sec to 2.0 m / sec, the pumping efficiency by the pump will be kept high and the pumping volume will be intermittent. Become
The mixing state with water on the surface of the water becomes good. Therefore, the temperature difference between the water temperature on the water surface and the water temperature of the mixed water is 0.5 ° C. to 1.0 ° C., and the mixed water diffuses along the water depth corresponding to the temperature. Such diffusion is often hundreds to 2000 meters
It has been confirmed to extend to

Intermittent air pumping apparatus 2 used in the above embodiment
Are installed in Lake 1, as shown in FIG. That is, the air chamber 14 is fitted in the lower portion of the lower pumping cylinder 13, and the rope 15
The weight 16 is connected to the bottom 16 by fixing the weight 16 to the water bottom 17. An upper pumping cylinder 18 is provided above the lower pumping cylinder 13.
The lower part (composed of four pieces) is connected, and the float 19 is attached to the upper outside of the upper pumping cylinder 18, and the weight 16 and the float 19 hold the pumping device vertically. When the pressurized air is fed to the air chamber 14 through the hose 20 as shown by the arrow 21, the pressurized air accumulates in the air chamber and is discharged into the lower pumping cylinder 13 every time a predetermined amount is accumulated. Therefore, the discharged air is
The air bubbles 23 become large bubbles 23 and rise in the lower pumping cylinder 13 as shown by the arrow 22, and as the large bubbles 23 rise, water is absorbed from the lower end of the lower pumping cylinder 13 as shown by the arrow 24. The large bubble 23
Is divided and rises as bubbles 25 in each upper pumping cylinder 18 and is discharged from the upper end thereof. Therefore, the lower pumping cylinder 13
The water rising in the inside (maximum flow velocity 1.2 m / sec) is also divided into each upper pumping cylinder 18 and discharged from the upper end thereof. The released water (for example, water temperature 10 ° C) is the water on the surface (for example, water temperature 2
0 ° C) and mixed water (for example, water temperature 19.5 ° C)
Shown along the depth of water that corresponds to the water temperature (for example, 1 m below the water surface) 2
It spreads like 6. The diffused water collides with adjacent diffused water, or collides with the shore, and descends as shown by an arrow 27,
It flows toward the lower part of the pumping device 2 and is sucked up from the lower end of the lower pumping cylinder 13 as shown by an arrow 24.

As described above, since a large amount of water in the lake 1 causes up-and-down convection slowly, it takes a long time (for example, 120 hours to 240 hours).
During the time), all water is mixed and the dissolved oxygen amount and PH
Not to mention the water temperature is almost constant.

As described above, by sufficiently diffusing, the amount of dissolved oxygen is improved, the pH is adjusted, the BOD value and the COD value are improved, and the powerful pumping circulation has a quick effect. For example, there is a report that the amount of dissolved oxygen is improved in one week by a pumping device equipped with one pumping cylinder having a diameter of 50 cm and a length of 10 m for a water amount of 1 million tons. It is also reported that with the same device, the water temperature of the lake at a water temperature of 20 ° C and the water temperature of the water bottom of 10 ° C was changed to 20 ° C at the water surface and 18 ° C at the water bottom in one week.

As described above, when the intended purpose is achieved by operating for a certain period of time, the operation of the pumping device is stopped based on the measured values of the oxygen sensor, the temperature sensor, and the like (for example, it is stopped in winter). However, by taking measures such as increasing or decreasing the number of operating vehicles (for example, water level fluctuation, water storage fluctuation, and other excessive capacity), the maximum effect can be achieved with the minimum operating cost. However, since the water quality of dams, lakes, swamps, etc. is constantly deteriorating due to inflow water, the number of pumping units operating is increased or decreased in response to the rate of deterioration,
It is also necessary to take measures such as increasing or decreasing the number of operating units depending on the external conditions (for example, the presence or absence of rainfall).

[0017]

[Example 2] PH of Lake 1 (water volume of 1 million m ³ ) was 4.5.
In this case, 100cc of high-concentration lime water (PH9) is injected into each pumping device 2a, 2b, 2c every second, and the amount of pumped water per second is 1.0
m ³ (50 cm diameter, 10 m long pumping cylinder)
It can reach PH6 in 40 hours. Therefore, if the set value of PH is set to 6, when the value of the PH sensor becomes 6, the output of the comparator 5 is input to the controller 9 and the medicine pump 8 is stopped. After that, only the circulation of water is performed, and the PH adjustment is stopped. Thus, the delivery of the medicine to the water pumping device 2 which does not require PH adjustment is automatically stopped. Further, if the PH value decreases, drug delivery will be started again.

[0018]

According to the present invention, since the automatic control is performed by comparing the measured value by various sensors with the preset value, the water quality is always kept near the preset value, and the intended purpose is automatically determined. There is an effect that can be achieved.

However, since all the operations are automated, there is an effect that a small number of managers can easily and surely manage the water quality of large-capacity dams, lakes, swamps, and the like.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of the present invention.

FIG. 2 is a block diagram of the management system.

[Fig. 3] Similarly, a usage state diagram of the water pumping device

[Explanation of symbols]

 1 Lake 2a, 2b, 2c Pumping device 3a, 3b, 3c Flow velocity sensor 4a, 4b, 4c, 4d Dissolved oxygen sensor 5 Comparator 6 Setting device 7 Compressor 8 Drug pump 9 Controller 10 Oscillator 11 Management headquarters 12 Controller 13 Lower part Pumping cylinder 14 Air chamber 16 Weight 18 Upper pumping cylinder 19 Float 23 Large air bubble 25 Air bubble

Claims (7)

[Claims] 1. Intermittent air pumping characterized by comparing the measured water quality value with a preset water quality value and controlling the feeding of pressurized air and / or the feeding of a water quality improving agent based on the difference. Device management method 2. Water quality values include dissolved oxygen content, BOD value, CO
The management method for an intermittent air pumping device according to claim 1, wherein a part or all of D value, PH value, conductivity, chlorophyll a value, turbidity, total phosphorus value, and total nitrogen value are used. 3. The management method in an intermittent air pumping apparatus according to claim 1, wherein the water quality improving agent is a coagulant, an algicidal agent, a pH adjusting agent, or a part or all of high-concentration oxygen water. 4. The management method in an intermittent pumping apparatus according to claim 3, wherein the pH adjusting agent is highly concentrated alkaline water or lime powder. 5. A management system for an intermittent air pumping device, characterized in that a water quality sensor arranged in a proper position is connected to a comparator, and an output of the comparator is connected to a control system of the intermittent air pumping device. 6. A control of an intermittent air pumping device, characterized in that a water quality sensor and a pumping cylinder flow velocity sensor, which are arranged at appropriate positions, are connected to a comparator, and the output of the comparator is connected to a control system of the intermittent air pumping device. system 7. The intermittent air pumping apparatus according to claim 5, wherein the control system comprises a feed amount control means and a pressure control means for the pressurized air, and a part or all of the administration control means for the water quality improving agent. Management system