JPH078939A - Mechanism for confirming addition amount of chemical liquid in waste water treatment apparatus - Google Patents

Abstract

PURPOSE:To confirm that a chemical liquid is fed to each treatment tank and to grasp its amount. CONSTITUTION:A dropping nozzle 71 is connected to the intermediate part between liquid feed tubes 61, 62 connecting a chemical liquid tank with a treatment tank. The chemical liquid fed through the tubes 61, 62 is formed into a droplet 8 to be dropped from the end opening of a dropping nozzle 71, and the falling of the droplet is detected optically to display it by flashing a display lamp, or to count the number of the droplets 8 to display the addition amount of the chemical liquid by converting the number into the amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention confirms the addition state and the amount of a treatment chemical aqueous solution in a sewage treatment apparatus by a biological treatment method or a coagulation sedimentation method, which has a treatment capacity of about 2 to 50 m ³ per hour. , About the control mechanism.

[0002]

2. Description of the Related Art In sewage treatment by a biological treatment method or a coagulation-sedimentation method, an aerobic microorganism is grown in the water to be treated so that the sewage component in the liquid is taken up by the microorganism, and then it is coagulated and precipitated. In order to improve the treatment efficiency, it is necessary to add an appropriate amount of treatment chemicals in accordance with the quality of the water to be treated, the degree of growth of flocs, etc. in each treatment step. Here, the outline of the sewage treatment apparatus by the biological treatment method will be described. This sewage treatment apparatus is almost the same as the ordinary one of this kind, and it is a raw water preparation tank 1, a pH adjustment tank 12, an aeration tank 13, a reaction tank 2, a flocculation tank 3, a precipitation tank 4, and a disinfection tank 5. , Sand filter tank 91, treated water tank 92, and the like, and while subjecting the treated water (sewage) to the raw water preparation tank 1 in order, a predetermined purification treatment is added, and the purified water is once treated water tank 92.
It is designed to be stored in and released into the sea. The raw water preparation tank 1 is provided with a sand settling tank 15 and a screen tank 16. The water to be treated introduced into this apparatus is first introduced into the sand settling tank 15 to remove sedimentable solid matter, and then this It is transferred to the screen tank 16 to remove floating solids and stored in the raw water preparation tank 1. Then, this water to be treated was pumped up by the water supply pump 14 and quantitatively fed to the pH adjusting tank 12, and an alkaline aqueous solution or an acidic aqueous solution was added thereto as necessary to adjust the water to be treated to a predetermined pH. After that, contact aeration type aeration tank
It is made to flow into 13, and bubble air is sent into it to dissolve oxygen in the liquid, thereby activating the microorganisms and activating the growth, and promoting the decomposition of the wastewater components. The water to be treated in which the microorganisms have sufficiently grown is transferred to the reaction tank 2 and the aqueous solution of the inorganic coagulant is added to this to generate fine flocs in the liquid, which is further transferred to the coagulation tank 3 for polymer aggregation. The floc is grown large by adding a chemical solution. Subsequently, the water to be treated is caused to flow into the settling tank 4, and while it is calmed, flocs are settled and removed. Then, the almost purified water to be treated is transferred to the disinfection tank 5, and the disinfectant aqueous solution is added to the water to disinfect it, and then the water is sent to the sand filtration tank 91 and the fine floating solid matter remaining in the solution. The water is filtered to complete the purification treatment, and the purified water is once stored in the treated water tank 92 and discharged to the outside of the system.

[0003]

In the sewage treatment apparatus described above, it is essential to add a certain amount of the treatment agent such as the inorganic coagulant, the polymer coagulant, and the disinfectant,
The effect is diminished if the amount is too large or too small. Therefore, these treatment chemicals are respectively prepared into aqueous solutions having a predetermined concentration and placed in the inorganic coagulant tank 21, the polymer coagulant tank 31, and the disinfectant tank 51, and the liquid transfer pump.
22, 32, and 52 quantitatively feed the reaction tank 2, the coagulation tank 3, and the disinfecting tank 5 and add them to the water to be treated in the respective treatment tanks. However, each chemical solution tank (2
Liquid delivery pipe 6 that connects 1, 31, 51) and the treatment tank (2, 3, 5)
Uses a pipe made of hard vinyl chloride resin of about 1/2 inch, and the tip of the pipe is inserted into the processing tank, so it is troublesome to check whether the chemical solution has been sent to the processing tank. However, there was a problem that the person in charge had to remove the lid of the processing tank and visually confirm that it was poured from the tip of the liquid feed pipe. Particularly, in a small-medium-scale sewage treatment apparatus having a treatment capacity of about 2 to 50 m ³ per hour, the amount of the chemical liquid added is extremely small, and the amount is about 5 to 40 ml per minute. It is difficult to control the amount of liquid, gas enters the liquid feed pump, scale adheres,
Even if the pump is operating due to foreign matter clogging, the prescribed amount of chemical liquid is not often delivered. Moreover, there is also a problem that it is impossible to judge whether or not a proper amount of the chemical liquid is added only by observing the state of dropping from the tip of the liquid supply pipe. INDUSTRIAL APPLICABILITY The present invention is capable of confirming that the chemical liquid is being sent to each of the processing tanks not only in the place where the chemical liquid is being sent, but also in other places, for example, in the operation monitoring room and the like. It is an object of the present invention to provide a chemical liquid addition amount confirmation mechanism capable of grasping the amount and also controlling the amount.

[0004]

According to the present invention, an intermediate portion of a liquid supply pipe 6 connecting a chemical liquid tank and a processing tank is divided and formed,
A drip nozzle 71 is connected to the divided end of the liquid feed pipe 61 on the side of the chemical liquid tank, and the chemical liquid fed through the pipe 61 is made into droplets 8 and the opening of the liquid feed pipe 62 on the side of the processing tank from the drip nozzle 71. Drop towards the edge. Then, a mechanism for detecting a droplet is attached thereto, the droplet 8 falling from the dropping nozzle 71 is detected, and the detected output is converted into a detection output and sent to the controller 74. On the other hand, the controller 74 is provided with an indicator light, a display panel for the amount of chemical liquid added, and the like.
By blinking the indicator lamp in response to the detection output sent from the droplet detection mechanism, the droplet 8 is dropped.
Display the state of falling from 71, count the number of droplets falling from the dropping nozzle 71 by this detection output,
The above-mentioned object is achieved by means of converting the addition amount of the chemical liquid per unit time or the addition amount of the chemical liquid and displaying it on the display panel. The indicator light and the display panel of the added amount of the chemical liquid are provided at the place where the liquid feed amount control valve of the chemical liquid is attached, the operation monitoring room, etc., so that it is easy to confirm the dropping state and the added amount of the chemical liquid, It is possible to always send an appropriate amount of chemical liquid to the processing tank. When the controller 74 is connected to the liquid supply amount adjusting valve of the liquid supply pipe 61 and an appropriate amount of the chemical liquid is input to the controller 74, the liquid droplets 8 falling from the dripping nozzle 71 are dropped.
It is also possible to adopt an embodiment in which the degree of opening and closing of the liquid feed rate adjusting valve is automatically controlled so that the amount of the same becomes the same as the added amount.

[0005]

In the present invention, the dropping nozzle 71 is provided in the middle portion of the liquid delivery pipe 6.
Since the chemical liquid sent by this pipe is once passed through the dropping nozzle 71, the chemical liquid drops as a droplet at the opening end of the dropping nozzle 71 due to the surface tension. Since the volume of this droplet is almost constant, the amount of the chemical solution sent to the processing tank is accurately grasped and visually confirmed by irradiating the droplet with light and counting.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mechanism for confirming the addition amount of a chemical liquid in a sewage treatment apparatus according to the present invention will be specifically described below based on the illustrated embodiments. This embodiment shows an example of detecting the liquid droplets dropped from the dropping nozzle by light, and the mechanism for confirming the addition amount of the chemical liquid is composed of a dropping nozzle 71, a light emitter 72, a light receiver 73, and a controller 74. On the other hand, mineral flocculant tank
21 An intermediate portion of the liquid supply pipe 6 that connects the other chemical liquid tank and the reaction tank 2 and other processing tanks is divided, and a chemical liquid addition amount confirmation mechanism is attached to that portion. Dripping nozzle
71 is connected to the cut end of the liquid feed pipe 61 on the chemical liquid tank side, and its open end is located directly above the cut end of the liquid feed pipe 62 on the processing tank side. , 31, 5
The chemical solution delivered from 1) enters the dripping nozzle 71 through the liquid delivery pipe 61, and drops into droplets 8 at the opening end of the nozzle due to the surface tension of the chemical solution. Then, the droplet 8 enters the lower liquid supply pipe 62 and is sent to the respective processing tanks (2, 3, 5). The light-emitting body 72 and the light-receiving body 73 form a pair, and both face each other on both sides of the trajectory of the droplet 8 that drops from the opening end of the dropping nozzle 71. And the luminous body
From 72, a linear light that reaches the photodetector 73 by intersecting with the drop trajectory of the droplet 8 is emitted. On the other hand, a controller 74 is connected to the photodetector 73, The emitted light is detected and the detection output is sent to the controller 74. Therefore, the liquid droplet 8 is discharged from the opening end of the dropping nozzle 71.
When is dropped, the droplet 8 intersects with this light on the way of the drop,
The light hits the droplet 8. Then, since the light is refracted by the droplet 8, it does not reach the light receiving body 73 and is blocked by the droplet 8. Therefore, the light with which the light receiving body 73 is irradiated is interrupted each time the droplet 8 falls, and apparently becomes blinking light. Then, this blinking light is detected by the light receiver 73,
It is converted into a detection output and sent to the controller 74. Although not shown in the figure, the controller 74 is provided with an indicator light, a display panel for the addition amount of the chemical solution, etc., and the indicator lamp blinks in response to the above-mentioned detection output sent from the photoreceptor 73. Drop 8
Displays the state of dropping from the dropping nozzle 71, or counts the number of droplets dropping from the dropping nozzle 71 by this detection output, and converts it to the addition amount of chemical liquid per unit time or the addition amount of integration. It is designed to be displayed on the display panel. If the droplet 8 is made to intersect with the light while falling from the opening end of the dropping nozzle 71 toward the liquid delivery pipe 62, the time during which the light is blocked by the droplet 8 is extremely short, and it is almost impossible. However, since it is instantaneous, the blinking cannot be visually confirmed by blinking it with the indicator lamp.In particular, in this embodiment, the light emitted from the light emitting body 72 is not emitted. The light emitting body 72 and the light receiving body 73 are set so as to pass a position about 3 to 5 mm away from the opening end of the dropping nozzle 71. Therefore, the light emitted from the light emitting body 72 continues to hit the droplet 8 while the droplet 8 generated at the opening end of the dropping nozzle 71 grows to a certain size or more and then falls. Since the light does not reach the middle light receiving body 73, the time during which light does not reach the light receiving body 73 becomes long, and the blinking of the indicator lamp can be visually confirmed. Although not shown, the controller 74 is also connected to the liquid feed amount adjusting valve of the liquid feed pipe 61, and when the proper addition amount of the chemical liquid is input, the amount of the droplet 8 that drops from the dropping nozzle 71. Is automatically controlled so that the liquid supply amount control valve is opened and closed so as to be the same as the added amount.

[0007]

As described above in detail, according to the present invention, the amount of the chemical liquid sent from the chemical liquid tank to the processing tank is extremely small,
Since it is about 5 to 40 ml per minute, the middle part of the liquid feeding pipe 6 that connects the liquid feeding amount and the processing tank is vertically divided, and the dropping nozzle 71 is connected to the cut end of the upper liquid feeding pipe 61. , This tube
By passing the chemical solution sent through 61 through the dropping nozzle 71, the chemical solution drops into droplets 8 at the opening end due to the surface tension, which makes it extremely easy to count. Moreover, since the volume of the droplet 8 is almost constant, it is possible to accurately grasp the amount of the chemical solution sent to the processing tank by counting the volume, and to determine the amount. It became easier to control. In addition, it is possible to visually detect the chemical liquid by making it into liquid droplets, and an indicator light attached to the controller 74, a display panel for the added amount of the chemical liquid, and the like are provided with a chemical liquid feed amount control valve. By providing it in a place where it is installed, an operation monitoring room, or the like, the addition state of the chemical liquid can be surely and easily confirmed, and an appropriate amount of the chemical liquid can always be sent to the processing tank.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of a mechanism for adding a chemical liquid.

FIG. 2 is a system diagram showing an example of wastewater treatment by a biological treatment method.

[Explanation of symbols]

 1 Raw water preparation tank 2 Reaction tank 3 Coagulation tank 4 Precipitation tank 5 Disinfection tank 6 Discharge pipe 8 Droplet 12 pH adjusting tank 13 Aeration tank 14 Water pump 15 Sand setter 16 Screen tank 21 Inorganic coagulant tank 22 Liquid transfer pump 31 High Molecular flocculant tank 32 Liquid feed pump 51 Disinfectant tank 52 Liquid feed pump 61 Liquid feed pipe 62 Liquid feed pipe 71 Drop nozzle 72 Light emitter 73 Light receiver 74 Controller 91 Sand filter tank 92 Treated water tank

Claims (2)

[Claims] 1. A pipe for connecting a chemical liquid tank and a treatment tank of a sewage treatment apparatus is formed by dividing an intermediate portion of the liquid pipe, and a dropping nozzle is connected to a cut end of the liquid pipe on the chemical liquid tank side to form this pipe. The chemical liquid sent through the liquid drops from the opening end of the dropping nozzle to form droplets, and a mechanism for detecting the droplets is attached and a controller is connected to the liquid so that the liquid drops from the opening end of the dropping nozzle. When a drop falls, it is detected and the indicator light blinks according to the detection output to display it.
A mechanism for confirming the addition amount of a chemical liquid in a sewage treatment apparatus, characterized in that the number of drops of droplets per unit time is converted into an addition amount and displayed. 2. A light-emitting body and a light-receiving body for detecting light emitted from the light-emitting body are mounted face to face on both sides of a drop trajectory of a liquid drop falling from the opening end of the dispensing nozzle.
2. The chemical liquid in the wastewater treatment apparatus according to claim 1, wherein the light emitter emits linear light that intersects with the drop trajectory of the droplet toward the light receiver, and a controller is connected to the light receiver. Addition amount confirmation mechanism.