JPH0576855A - Method and device for injecting chemical solution in water treatment apparatus - Google Patents

Abstract

PURPOSE:To obtain a means capable of stably dripping and injecting a chemical solution by forming a chemical solution tank as a hermetically closed container and adjusting the passing amount of the air sucked in the chemical solution tank through the air pipe communicating with the outside of the upper part of the tank. CONSTITUTION:A chemical solution is sent into a chemical solution tank 1 and a chemical solution charging port 10 is closed by an opening and closing lid 11 and the opening and closing valves 20,30 of an injection pipe 2 and an air pipe 3 are opened. When air bubbles are not collected in a bubble collector 4, the route reaching the bubble collector 4 from the chemical solution tank 1 through the air pipe 3 becomes a hermetically closed state and the outflow of the chemical solution from the injection pipe 2 is stopped. The air bubbles 52 blown into a liquid (e) to be treated in a treatment tank (c) from an air diffusion pipe 51 by a blower 5 through an air pipe 50 enter the bubble collector 4 from the open port 40 thereof and air flows in the chemical solution tank 1 corresponding to the amount of air bubbles and the chemical solution is dripped from the injection pipe 2 in the amount corresponding to that of air bubbles. Therefore, by adjusting the collection amount of air bubbles 52 by altering the shape, size and arranging position of the bubble collector 4, the chemical solution can be stably dripped and injected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a chlorine treatment agent, a defoaming agent, a pH control agent, and a microorganism in a treatment tank such as a wastewater tank, a pH adjusting tank, and an aeration tank of a water treatment device for purifying wastewater. The present invention relates to an improvement of an injection method and an injection device for injecting a liquid medicine such as a nutrient solution by dropping.

[0002]

2. Description of the Related Art Means for dropping and injecting a chemical solution into wastewater in a treatment tank of a water treatment apparatus has been conventionally known.
As shown in FIG. 1, the chemical solution tank 1 is supported by an appropriate supporting member above the treatment tank b in which the liquid a to be treated such as sewage is filled, and the chemical solution is allowed to flow out to the bottom thereof. The injection pipe 2 for injecting into the liquid a to be treated in the treatment tank b is connected to the injection pipe 2, and a valve V for adjusting the opening is attached to the injection pipe 2 to control the opening of the valve V. , Injection tube 2
The chemical solution is discharged from the tank by adjusting it so that a very small amount of it is dripped in drops, or, as shown in FIG. 2, above the processing tank b in which the liquid to be processed a is filled. A metering pump P for pumping out the medicinal solution is attached to the suspended medicinal solution tank 1, and the medicinal solution is treated at a discharge port of the metering pump P.
The injection pipe 2 for flowing out to the liquid to be treated a therein is connected, and by controlling the operation of the metering pump P, the outflow of the chemical liquid from the injection pipe 2 is adjusted so as to be drip-shaped. It is done by that.

[0003]

According to the conventional means, in the means shown in FIG. 1, the injection of the chemical liquid from the injection pipe 2 is performed in a drip manner. Since the adjustment is performed by adjusting the opening degree of the valve V provided in the pipe 2, the adjusted opening of the valve V forms an extremely narrow gap, so that fine dust mixed in the chemical solution or precipitated from the chemical solution. Since the crystals of the chemical liquid component present are caught on the opening of the valve V to cause clogging, there is a problem that the stable injection of the chemical liquid cannot be performed.

Further, in the means shown in FIG. 2, since the metering pump P is used, the cost is increased and the power source is required to drive the metering pump P, and maintenance is required. There is a problem that becomes extremely troublesome.

The present invention has been made in order to solve these problems that have occurred in the conventional means, and has a simple structure in which electricity is not used, but fine dust and precipitates are present in the chemical solution. Even so, a new means is provided for adjusting means for adjusting the drop of the chemical solution so as to be performed in a drip form in a very small amount, so that the chemical solution can be stably dropped and injected without causing clogging. The purpose is to

[0006]

SUMMARY OF THE INVENTION The present invention, however, has been completed for the above-mentioned purpose based on the findings obtained through various studies and experiments.

That is, since the conventional means is designed to directly control the outflow amount of the drug solution in order to adjust the drop amount of the drug solution dropped from the injection pipe 2, various problems occur. Yes, the chemical solution tank is formed in a closed container, and the outflow of the chemical solution from the injection pipe communicating with the bottom of the chemical solution tank is controlled by the pressure of the air in the chemical solution tank.
By connecting a ventilation pipe that communicates with the outside to the upper part of this chemical liquid tank and adjusting the amount of gas that is sucked into the chemical liquid tank and flows in through this ventilation pipe, the amount of chemical liquid that flows out indirectly. It was conceived that the chemical solution could be dripped stably even if there were fine dust or precipitates in the chemical solution by controlling the above. is there.

From this fact, in the present invention,
As a means for achieving the above-mentioned object, a chemical solution such as a chlorine agent, an antifoaming agent, a pH adjusting agent, and a nutrient for microorganisms is added to a treatment tank such as a wastewater tank, a pH adjusting tank, and an aeration tank of a water treatment device. In the method of injecting a liquid medicine by dropping it from an injection pipe leading to a liquid medicine tank, a liquid medicine tank is formed in a closed container, and an injection pipe for dropping the liquid medicine is connected to the lower end side of the liquid medicine tank, and the upper end portion is connected. A thin ventilation pipe through which gas passes is connected to the outside so that the amount of chemical liquid dropped from the injection pipe of the chemical liquid tank is adjusted by adjusting the amount of ventilation that passes through the ventilation pipe and flows into the chemical liquid tank. We propose a method for injecting chemicals in a water treatment device, which is characterized by controlling the water content, and also to add chlorine agent and deodorant to the upper opening of the water treatment device such as sewage tank, pH adjusting tank, and aeration tank. Chemical liquids such as foaming agents, pH adjusting agents, microorganisms, nutrients, etc. An injection pipe for dripping is provided, and the base end side of the injection pipe is connected and communicated with the bottom of a chemical liquid tank composed of a closed container whose chemical liquid inlet is sealed by an opening / closing lid. It is supported so as to be positioned higher than the tip opening of the injection pipe, and on the upper end side of the chemical solution tank,
The present invention provides a chemical liquid injector in a water treatment device, which is connected to a ventilation pipe for allowing gas to flow from the outside into the chemical liquid tank, and which is provided with adjusting means for adjusting the ventilation amount.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a chemical injection device for a water treatment device according to the present invention will be described in detail below with reference to the drawings. In addition, the drawing symbols are
The same reference numerals are used for components having the same effect as those of the conventional means.

FIG. 3 is a partially cutaway front view of a chemical injection device of a water treatment apparatus according to the present invention. In the drawing, 1 is a chemical liquid tank, 2 is an injection pipe, and b is a liquid to be treated a. Water treatment equipment treatment tank, c is another treatment tank, 3 is a ventilation pipe, d
Indicates adjusting means.

The chemical liquid tank 1 is formed as a closed container, and a chemical liquid inlet 10 for pouring the chemical liquid is provided on the upper surface side, but it is sealed by a detachable opening / closing lid 11. There is. Further, the chemical liquid tank 1 is arranged above the processing tank b which requires the dropping and injection of the chemical liquid into the object to be processed, and is supported by an appropriate supporting member.

The injection pipe 2 has a base end side connected and communicated with the lower end side of the chemical liquid tank 1, and a front end side of the injection pipe 2 faces above an opening on the upper surface side of the processing tank b. An on-off valve 20 that is manually opened and closed is connected to the middle of the injection pipe 2. The on-off valve 20 prevents the chemical solution existing in the chemical solution tank 1 from flowing out at a time when the opening / closing lid 11 is opened to load the chemical solution into the chemical solution tank 1. It is an on-off valve.

The vent pipe 3 is connected to the upper end side of the chemical liquid tank 1 so that the base end side thereof communicates with the air layer above the liquid level L of the chemical liquid loaded in the chemical liquid tank 1. Reference numeral 30 denotes an on-off valve which is provided at a portion of the ventilation pipe 3 protruding from the chemical liquid tank 1 and which is manually opened and closed.
The opening / closing valve 30 is also for closing the vent pipe 3 when the chemical liquid is loaded into the chemical liquid tank 1.

The ventilation amount adjusting means d provided in the ventilation pipe 3 is
An inverted funnel-shaped foam collector 4 is connected to the outer end side of the aeration pipe 3, and the aeration air, such as a contact aeration tank provided adjacent to the treatment tank b, is connected to the foam collector 4. It is guided to another processing tank c blown into the object to be processed, and the liquid to be processed e in the processing tank c.
The open port 40 at the lower end is immersed in the inside of the liquid to be treated e in the treatment tank c through the air diffuser pipe 51 connected to the tip of the blower device 50, which is pressure-fed by the air feed pipe 50 communicating with the blower device 5. Bubbles generated by the bubble collector 4 are collected by sending a part of the aeration air bubbles 52 ... 5
The ventilation amount of the ventilation pipe 3 is adjusted by the collection amount of 2 ...

In the apparatus of this embodiment, the chemical liquid is loaded into the chemical liquid tank 1, the chemical liquid inlet 10 is sealed with an opening / closing lid 11, and the open / close valve 20 provided in the injection pipe 2 and the open / close valve provided in the ventilation pipe 3 are closed. Thirty
If and are opened, if there is no collection of air bubbles in the foam collector 4, the inside of the liquid medicine tank 1 via the ventilation pipe 3 to the foam collector 4 will be in a sealed state, The outflow of the drug solution from the opening of the injection tube 2 is held in a stopped state.

Then, air bubbles 52 for aeration which are pressure-fed by an air supply pipe 50 connected to the blower device 5 and are blown out from the air diffuser 51 into the liquid e to be treated in the treatment tank c are formed. When entering the inside from the opening 40 at the lower end of the foam collector 4, the gas flows into the liquid medicine tank 1 from the ventilation pipe 3 by the amount of the bubbles, and the liquid medicine drips from the injection pipe 2 by that much. Become.

Therefore, by changing the shape, size, and position of the bubble collector 4 to adjust the amount of trapped air bubbles 52 of the aeration air, the amount of the chemical liquid dropped from the injection pipe 2 can be adjusted. Will be adjusted.

Next, FIG. 4 shows another embodiment. In this embodiment, the adjusting means d provided in the ventilation pipe 3 is
Is provided with an orifice 6 whose inner diameter is extremely narrowed, the outer end side of which is opened to the atmosphere, and the chemical solution tank 1 is passed through the vent pipe 3.
This is an example in which the amount of ventilation flowing into the inside is adjusted by the orifice 6, and since the configurations of the chemical liquid tank 1, the injection pipe 2 and the like are the same as those of the above-mentioned embodiment, the same effect can be obtained. The same reference numerals are given to the constituent members, and detailed description will be omitted.

In this embodiment, the chemical solution corresponding to the volume of the outside air flowing through the vent tube 3 through the orifice 6 and flowing into the chemical solution tank 1 is dropped from the injection tube 2. Become. Then, the dropping amount can be controlled as desired by adjusting the diameter of the orifice 6 and adjusting the ventilation amount flowing through the ventilation pipe 3.

Next, FIG. 5 shows a further different embodiment. In this embodiment, in the embodiment shown in FIG. 4, the air flow into the chemical liquid tank 1 through the orifice 6 provided in the ventilation pipe 3 is carried out, while the chemical liquid tank is discharged from the injection pipe 2. This is an example in which the suction operation is performed by the negative pressure generated in No. 1, whereas the air is forcedly sent through the orifice 6 using the pressurized air.

That is, although the orifice 6 is provided in the ventilation pipe 2 connected to and communicated with the upper end side of the chemical liquid tank 1, the outer end side of the orifice 6 is supplied with aeration air to the liquid e to be treated in the aeration tank c. By connecting and communicating in a side branch shape in the middle of the air supply pipe 50 connected to the blower device 5, a part of the pressurized air for aeration is adjusted in ventilation amount by the orifice 6, The chemical liquid tank 1 is forced to flow through the ventilation pipe 3.

In this embodiment as well, the remaining structure is the same as that of the above-mentioned embodiment, and therefore, constituent members having the same effect are designated by the same reference numerals and detailed description thereof will be omitted.

In this embodiment, the air whose amount of ventilation is adjusted by the orifice 6 has a constant pressure, so that the amount of ventilation by the orifice 6 is finely adjusted.

[0024]

As described above, according to the means of the present invention, in order to control the dropping amount of the drug solution dropped from the injection pipe 2 connected to the drug solution tank 1, the drug solution tank 1 is formed in a closed container, Make sure that siphoning is done,
The amount of air dripping from the injection pipe 2 is adjusted by adjusting the ventilation amount of the air flowing into the chemical liquid tank 1 by the ventilation amount adjusting means provided in the ventilation pipe 3 connected to the upper end side of the chemical liquid tank 1. Since it controls the temperature, it is a simple structure that does not use electricity, and adjusts so that even if minute dust or precipitates are present in the chemical solution, the chemical solution can be dripped into very small amounts in the form of a drip. Therefore, the chemical solution can be stably drip-injected into the means without causing clogging.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of conventional means.

FIG. 2 is a partially cutaway front view of another conventional means.

FIG. 3 is a partially cutaway front view of the chemical liquid injector of the water treatment device according to the present invention.

FIG. 4 is a partially cutaway front view of another embodiment.

FIG. 5 is a partially cutaway front view of yet another embodiment.

[Explanation of symbols]

a ... Liquid to be treated, b ... Treatment tank, c ... Treatment tank (aeration tank), d
... adjusting means, e ... liquid to be treated, V ... valve, P ... pump,
L ... Liquid level, 1 ... Chemical liquid tank, 10 ... Chemical liquid inlet, 11 ...
Open / close lid, 2 ... injection pipe, 20 ... open / close valve, 3 ... vent pipe, 30
... open / close valve, 4 ... foam collector, 40 ... open port, 5 ... blower device, 50 ... air supply pipe, 51 ... air diffuser, 52 ... air bubbles, 6
... orifice.

Claims (5)

[Claims] 1. A method of injecting a chemical solution such as a chlorine agent, an antifoaming agent, a PH adjuster, a microbial nutrient, etc. into a treatment tank such as a sewage tank, a pH adjusting tank, and an aeration tank of a water treatment apparatus, which is passed through a chemical tank. In the method of injecting a drug solution by dropping from a pipe, a drug solution tank is formed in a closed container, an injection pipe for dropping the drug solution is connected to the lower end side of the drug solution tank, and a gas passes through the upper end side. Connect the thin ventilation pipe to communicate with the outside,
A method for injecting a chemical liquid in a water treatment device, characterized in that the amount of the chemical liquid dropped from the injection pipe of the chemical liquid tank is controlled by adjusting the amount of ventilation that passes through the ventilation pipe and flows into the chemical liquid tank. 2. A chlorine agent, a defoaming agent, and a PH agent are provided at the upper opening of a treatment tank such as a wastewater tank, a pH adjusting tank, and an aeration tank of a water treatment device.
An injection pipe for dropping chemicals such as regulators, microorganisms and nutrients is provided, and the proximal end of the injection pipe is connected to the bottom of the chemical tank, which is a closed container with the chemical inlet sealed by an opening / closing lid. Then, the chemical solution tank is supported so that its bottom portion is positioned higher than the tip opening of the injection pipe, and the upper end portion side of the chemical liquid tank is connected with a ventilation pipe for allowing gas to flow into the chemical liquid tank from the outside. An injecting device for a chemical solution in a water treatment device, wherein the ventilation pipe is provided with an adjusting means for adjusting the amount of ventilation. 3. A reverse funnel-shaped foam collector for collecting a part of aeration air bubbles blown into the dirty water in the aeration tank and swirling and flowing is connected to the outer end side of the ventilation pipe, The chemical liquid injection device in a water treatment device according to claim 2, which is an adjusting means for adjusting the ventilation amount of the ventilation pipe according to the amount of bubbles collected by the foam collector. 4. The chemical liquid injection device in a water treatment device according to claim 2, wherein the ventilation pipe is provided with an orifice for adjusting a gas passage amount to serve as a ventilation amount adjusting means. 5. The vent pipe is provided with an orifice for adjusting the amount of gas passing therethrough, and the outer end side of the vent pipe is connected in the middle of a pipe for feeding air for aeration into the aeration tank. The liquid chemical injection device in the water treatment device according to claim 2, which is used as an adjusting means.