JPH07328319A - Dilution-injection system for emulsion type polymer coagulant - Google Patents

Abstract

PURPOSE:To provide a compact automatic supply system for diluting and injecting an emulsion type polymer coagulant. CONSTITUTION:In a system for diluting and injecting a coagulant, a dilution water supply apparatus 1 and an emulsion type high molecular coagulant supply apparatus 4 are connected electrically through a ratio setting device 3, the two supply apparatus are connected to a T-shaped conduit tube 6, a valve is attached at a position which makes the volume of the conduit tube 6 from an opening of the tube 6 to the position 500ml or less, and a conduit tube is connected between the other opening of the conduit tube 6 and a line mixer 10. The system is more compact than a conventional apparatus for diluting an emulsion type high molecular coagulant and easy of handling since the system can easily be operated automatically.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a self-diluting injection system for polymeric flocculants, particularly emulsion polymeric flocculants.

[0002]

2. Description of the Related Art Demand for water treatment coagulants, particularly powdery polymer water treatment coagulants, has been increasing year by year in response to stricter wastewater regulations. This powdery polymer flocculant is used by adding the powdery polymer flocculant to a dissolution tank containing water to a set concentration and stirring and dissolving it, but it takes a long time to dissolve the powder with stirring. Not only that, but since this powder is extremely fine powder, there is a problem that when it is charged into the melting tank, it will stand up and pollute the environment.

Therefore, emulsion polymer flocculants have recently been noticed and used in place of such powder polymer flocculants. The emulsion polymer flocculants currently on the market have a resin content of approximately 20 to 40%, and are diluted before use. With the advent of the emulsion polymer flocculant, the powdering problem was solved and the dissolution time was also improved, but in any case, a diluting tank equipped with a stirrer is required as with the powder polymer flocculant. However, the installation of such a diluting tank still increases the facility scale and installation area, and destroys the convenience of the emulsion polymer coagulant. Therefore, a method has been proposed in which dilution water and emulsion polymer flocculant are sucked into the same pump to reduce the equipment scale and installation area, and mixed in the pump, but the dilution ratio fluctuates during operation and stable operation is possible. Have difficulty.

[0004]

Therefore, as a result of repeated studies on the dilution injection system of the emulsion polymer coagulant, the present inventors did not need a dilution dissolution tank, and therefore the equipment scale and the installation area were small. We have completed a dilution injection system with excellent dilution and miscibility that allows the dilution ratio to be set freely.

[0005]

That is, according to the present invention, a dilution water flow meter connected to a dilution water supply device and an emulsion polymer flocculant supply device are electrically connected via a ratio setting device. A valve is mounted on the vertical conduit of the T-shaped conduit, and the valve mounting position is such that the conduit capacity from the T-shaped conduit opening to the valve mounting part is 500 ml or less, and one of the T-shaped conduits The horizontal conduit is connected to the dilution water supply conduit, the vertical conduit is connected to the emulsion polymer flocculant supply conduit, and the other horizontal conduit is connected to the line mixer. Molecular coagulant dilution injection system.

Japanese Patent Laid-Open No. 5-169067 discloses a method of diluting a coagulant, in which a diluted inorganic coagulant and water to be treated are mixed by a line mixer. Is basically different in concept.

[0007]

The present invention will be described in more detail below with reference to the flow sheet of FIG. 1 in the flow sheet of FIG.
Is a dilution water supply device, and 2 is a flow meter. Flow meter 2
It is electrically connected to the emulsion polymer flocculant supply device 4 via the ratio setting device 3. Therefore, when changing the dilution ratio, if the ratio setter 3 is set to a desired ratio, for example, the inverter 12 incorporated in the same circuit will be used.
Is activated, the rotation number of the emulsion polymer coagulant supply device 4, for example, the metering pump is changed, and the emulsion polymer coagulant supply amount is changed to a set amount.

Reference numeral 5 denotes a dilution water conduit, which is connected to one horizontal conduit 6a of the T-shaped conduit 6. An emulsion polymer flocculant conduit 7 is connected to the vertical conduit 6b of the T-shaped conduit 6,
The other horizontal conduit 6c of the line mixer conduit 8
Are linked to. Vertical conduit 6b of T-shaped conduit 6
A valve 9 is attached to the. The mounting position of the valve 9 is T shown in FIG. 2, which is a partially enlarged view of the T-shaped conduit 6.
The conduit volume from the A-shaped conduit opening A to the valve mounting part B is
The position is 500 ml or less.

The inventors have encountered a very difficult problem in the process of investigating an emulsion polymer flocculant dilution injection system. When the operation of diluting and injecting the emulsion polymer coagulant is stopped, that is, when the operations of the emulsion polymer coagulant supply device 4 and the dilution water supply device 1 are stopped, the emulsion high-pressure agent remaining in the emulsion polymer coagulant conduit 7 is increased. The molecular flocculant gradually overflows into the horizontal conduit 6c of the T-shaped conduit, which gradually swells due to the dilution water remaining in the T-shaped conduit, and blocks the horizontal conduit 6c or the line mixer 10. Was there. Therefore, when restarting the operation, it was necessary to decompose the portion of the T-shaped conduit 6 and remove the polymer coagulant swelling material. Therefore, after changing the shape of the opening A of the vertical conduit 6b of the T-shaped conduit 6 or stopping the emulsion polymer coagulant supply device 4, only the dilution water supply device 1 is operated and the residual emulsion height is increased. Attempts were made to pump up and accompany the molecular flocculant, but none succeeded.

Therefore, as a result of further studies on various operating conditions, types of emulsion polymer coagulants, for example, dispersion polymer coagulants, which are a type of emulsion, as a result, from the T-shaped conduit opening A to the valve mounting portion. If the valve 9 is installed at a position where the conduit volume up to B is 500 ml or less,
Although some emulsion polymer flocculant swelling was generated, it was confirmed that the operation could be restarted without any trouble.

In a particularly preferred embodiment of the present invention, the vertical inner diameter of the T-shaped conduit 6 is 6 to 10 mmφ. If it is smaller than this pipe diameter, the pressure loss is likely to increase and the conduit is apt to be blocked. If it is larger than this pipe diameter, the contact area between the diluting water and the polymeric flocculant becomes large, and the swelling phenomenon of the flocculant occurs. As a result, not only the pressure loss increases, but also defective dissolution easily occurs. Further, the pipe diameter of the T-shaped conduit 6 in the horizontal direction, that is, in the direction from 6a to 6c is the same as the above 6b or about 4 times as large as 6b. Further, the flow velocity of the dilution water in the T-shaped conduit in the horizontal direction needs to be 0.2 m / s or more. Below this flow rate, the swelling material of the coagulant is likely to stay in the T-shaped conduit, clogging the conduit and increasing the pressure loss,
Alternatively, it is not preferable because the dissolution in the line mixer 10 is insufficient.

The line mixer conduit 8 is connected to the line mixer 10, and the emulsion polymer flocculant is dissolved and diluted while passing through the line mixer 10. The emulsion polymer coagulant dissolved and diluted by the line mixer 10 is introduced into a coagulation sedimentation tank or the like via an injection conduit 11.
In addition, by providing a dilution water flow rate control valve 13 between the flow meter 2 and the T-shaped conduit 6, the type of water to be treated,
The addition amount of the coagulant can be freely adjusted according to the treatment amount.

The operation method of the emulsion polymer coagulant dilution injection system of the present invention is as follows. First, the operation is started by starting the dilution water supply device 1 and then adjusting the optimum flow rate by the dilution water flow rate adjusting valve 13. Next, after opening the valve 9, the emulsion polymer flocculant supply device 4 is started. Further, the stop of the operation may be performed by reversing this series of operations, and such an operation may be automated through a generally used sequential control program or the like. The optimum flow rate by the dilution water flow rate control valve 13 is adjusted according to the type and flow rate of the water to be treated introduced into the coagulation sedimentation tank, and the ratio setting device 3 sets the dilution ratio. In addition, the flow rate adjustment by the dilution water flow rate control valve 13 is
It can also be automated so as to be linked to the flow rate of the water to be treated.

[0014]

EXAMPLES The present invention will be further described below with reference to examples. The system experimental apparatus of the present invention was assembled as shown in the flow sheet of FIG. Dilution water supply pump 1 (Capacity:
(Height: 30 m, Discharge rate: 50 L / min), and the dilution water flow rate control valve 13 is opened so that the speed is 10 L / min.
The dilution water is continuously supplied to the T-shaped conduit 6 through the valve, the valve 9 is opened, and the emulsion polymer flocculant supply pump 4 (capacity: head 50 m, discharge rate 250 ml / min) is operated continuously. An emulsion polymer flocculant (manufactured by Hymo Co., Ltd., trade name Hymolok E-395, resin content concentration 20%, viscosity 150 cps) was supplied to the T-shaped conduit 6. Ratio setter 3 in this case (Watanabe Electric Industry
The setting value of (manufactured by Co., Ltd.), that is, the dilution ratio was 100 times, and an inverter (manufactured by Yasukawa Electric Co., Ltd.) was used for this electric circuit. In addition, the adhesion position of the valve 9 is set to 450 ml, the diameter of 6b of the T-shaped conduit 6 is 4 mmφ, and the diameter of the tube from 6a to 6c is 16 mmφ. : Static mixer) was connected in series and used.

Continuous operation was carried out for 3 hours, and the concentration of the injected water was measured every 1 hour.
The emulsion polymer flocculant was completely dissolved. Further, after continuous operation for 3 hours, the operation was restarted after stopping for 2 hours, but the operation could be restarted without any trouble. For comparison, the bonding position of the valve 9 was changed to a position where the conduit volume from the T-shaped conduit opening to the valve mounting part was 600 ml, and the same operation as above was performed, but there was no problem during operation. Did not happen. However, when the operation was restarted after stopping for 2 hours, the operation was stopped because the amount of injected water was poor. At this time,
When the T-shaped conduit 6 was removed, the swollen material of the emulsion polymer coagulant was found to be clogged in the conduit.

[0016]

As described in detail above, the system of the present invention is an extremely compact emulsion polymer flocculant diluting injection system, so that it does not require a large installation area as in the conventional system, and the emulsion polymer flocculant Since troubles due to swelling are also avoided, the operation can be started and stopped very easily, and the flow meter 2 and the emulsion polymer coagulant supply device 4 are electrically connected via the ratio setting device 3. Therefore, the injection amount and concentration of the emulsion polymer flocculant can be freely changed and set according to the type and concentration of suspended solids in the treated water such as industrial wastewater, human waste and sewage. It is extremely simple and convenient, and the area that contributes to the development of industry is enormous.

[Brief description of drawings]

FIG. 1 is a flow sheet diagram of the emulsion polymer flocculant dilution injection system of the present invention.

FIG. 2 is a partial enlarged view of the T-shaped conduit of the emulsion polymer flocculant dilution injection system of the present invention.

[Explanation of symbols]

 1 Diluting Water Supply Device 2 Flow Meter 3 Ratio Setting Device 4 Emulsion Polymer Flocculant Supply Device 5 Dilution Water Conduit 6 T-shaped Conduit 7 Emulsion Polymer Flocculant Conduit 8 Line Mixer Conduit 9 Valve 10 Line Mixer 11 Injection Conduit 12 Inverter 13 Dilution water flow control valve

Claims (1)

[Claims] 1. A dilution water flow meter connected to a dilution water supply device and an emulsion polymer flocculant supply device are electrically connected via a ratio setting device, and are connected to a vertical conduit of a T-shaped conduit. The valve is installed and the valve installation position is such that the conduit volume from the T-shaped conduit opening to the valve installation part is
At a position of 500 ml or less, a dilution water supply conduit is connected to one horizontal conduit of the T-shaped conduit, an emulsion polymer flocculant supply conduit is connected to the vertical conduit, and the other is connected to the vertical conduit. Emulsion polymer flocculant dilution injection system with line mixer connected to horizontal conduit.