JPH0336570B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a mixing device, and particularly to a device having a small-sized reaction maturation tank in which the reaction time can be freely set to suit various reaction actions.

[Prior art] In the treatment of various industrial wastewater and other types of wastewater, treatment equipment that mixes a specified reaction fluid with the wastewater stock solution, performs chemical treatment on it, and then releases it is well known, and is widely used in the treatment of wastewater or generated wastewater in chemical processing plants. It is used.

Particularly in recent years, concrete wastewater from construction sites, etc., has become a major problem as this type of wastewater concentrate, and there is a demand for calcium-based wastewater with a high pH level to be properly treated and discharged. In other words, in the past, concrete wastewater, etc., was generally discharged into the sewer as is, but in such primitive discharge treatment, the PH level in the sewer increases significantly,
Because it is extremely difficult to process with purification equipment,
Each construction site must be treated individually, which requires small processing equipment.

Normally, in order to neutralize the stock solution through the chemical reaction described above, a predetermined reaction fluid (neutralizing solution) is added to the stock solution.
A predetermined neutralization effect is performed by supplying and adding reaction fluid, but the amount of reaction fluid to be supplied at this time must be controlled while monitoring the reaction results. There was a problem in that it caused a significant change in the pH level of the effluent, making purification more difficult. Therefore, even in conventional devices, such a reaction neutralization device has a method of fully maturing the reaction after mixing the stock solution and the reaction fluid, and detecting the PH degree and other factors after this maturation and supplying the reaction fluid. A controlled amount is used and such devices are known as reaction maturation devices.

However, in the conventional reaction maturation apparatus, a large maturation tank is required in order to perform a sufficient maturation effect, and the size of the apparatus cannot be avoided. In particular, the reaction maturation time differs greatly depending on the type of stock solution or reaction fluid, and a device that is compatible with these various processing operations requires a large-capacity maturation tank that is compatible with processing liquids that require a long reaction maturation time. The drawback is that it is not possible to obtain a small and simple device for use at construction sites, etc., as described above.

[Object of the Invention] The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to make it possible to sufficiently accurately control the supply amount of reaction fluid even with a small maturation tank, and to adjust the supply amount to various processing liquids. An object of the present invention is to provide an improved mixing device in which the maturation time can be arbitrarily adjusted.

[Structure of the Invention] In order to achieve the above object, the present invention provides a bypass line in a conventional maturation tank, and discharges a part of the mixed liquid without passing through the maturation tank, thereby:
In the maturation tank, only a part of the mixed liquid is sampled and matured.This allows the reaction maturation device to perform a sufficient maturation effect and control the supply amount of reaction fluid with high precision even though it is a small maturation tank. In addition, by arbitrarily changing the amount of bypass in the bypass line, the amount of sampling in the maturation tank can be changed according to the characteristics of the processing solution, and the amount of sampling in the maturation tank can be changed to a processing solution with a slow reaction time. In contrast, the bypass amount is increased to lengthen the reaction time in the maturation tank, thereby making it possible to prevent reaction results from being monitored in an immature state.

[Embodiments] Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a schematic configuration of the reaction maturation apparatus according to the present invention, in which a stock solution 100 is stored in a pre-tank 10 and then pumped up and supplied from a pump pipe 14 to a line mixer 16 by a pump 12. Ru.

Of course, in the present invention, the stock solution 100 may be directly supplied to the line mixer 16 without passing through the pre-tank.

The line mixer 16 consists of a static mixing device in which a plurality of mixing elements are arranged in a pipe at different phases, and a desired mixing effect is performed when the feed liquid passes through each of the mixing elements.

Upstream of the line mixer 16, a reaction fluid 200 is supplied to a part of the pumping pipe 14,
As a result, the stock solution 100 and the reaction fluid 200 are simultaneously supplied inside the line mixer 16, and the stirring and mixing action is performed as efficiently as the static mixing element described above, and the exit side thereof is extremely uniform. The processing liquid 300 mixed with the above is discharged.

In this embodiment, the stock solution 100 is made of, for example, concrete wastewater at a construction site, and various acids such as dilute sulfuric acid and dilute hydrochloric acid are suitable as the reaction fluid 200, but in this embodiment, carbon dioxide gas is used as the reaction fluid. is used, and carbon dioxide gas is supplied into the pumping pipe 14 from a carbon dioxide gas source 18 via a valve 21. Therefore, in the line mixer 16, carbon dioxide gas is mixed into the concrete waste liquid and is efficiently dissolved until it is sufficiently saturated.

The treatment liquid 300 is supplied to a maturation tank 20 provided downstream of the line mixer 16, a predetermined reaction maturation action is performed in the maturation tank 20, and then the treatment liquid 300 is supplied to a maturation tank 20 provided downstream of the line mixer 16.
It is discharged to 2.

The reaction result of the fully matured treatment liquid at the outlet side of the maturation tank 20 is taken out from the sampling valve 24 to the sensor 26, and the reaction result is measured and monitored.
After the detection of the reaction result by the sensor 26 and the measurement of the PH degree in the embodiment are completed, the sampled processing liquid is discharged into the discharge tank 22.

Then, the detection result of the sensor 26 is determined by the valve 2.
1, and the opening degree of the valve 21, that is, the amount of carbon dioxide gas supplied from the carbon dioxide source 18 to the pumping pipe 14 is adjusted.

Therefore, it is understood that the amount of reaction fluid 200 supplied to the stock solution 100 is accurately controlled based on the maturation result in the maturation tank 20.

The present invention is further characterized in that a bypass line 28 is provided in parallel to the maturation tank 20, and the treatment liquid 300 is supplied to the maturation tank 20 and the bypass line 28 in a branched manner.

Therefore, according to the present invention, the maturation tank 20 only needs to mature a part of the processing liquid 300;
Since 0 is uniformly stirred and mixed, by maturing only a part of it in the maturation tank 20, sufficient maturation time can be taken even if the maturation tank 20 is made small. Monitoring can be performed with extremely high precision, and as a result, the reaction fluid 20
It has the advantage that the supply amount of zero can also be accurately controlled.

In the present invention, a control valve 30 is provided in the bypass line 28, thereby
The amount of bypass can be adjusted arbitrarily, for example, for a processing liquid that requires a long maturation time, the opening degree of the valve 30 is increased to increase the amount of bypass, thereby,
It becomes possible to obtain sufficient maturation time even in the small-sized maturation tank 20.

Therefore, in the present invention, there is no need to provide a large maturation tank with sufficient safety for each stock solution as in the past, and even a small maturation tank can be matured extremely efficiently by installing the bypass line 28. This method has the advantage that the results can be monitored and the supply amount of the reaction fluid can be controlled accordingly.

In the illustrated embodiment, a control input can be supplied from a control end 32 to the valve 21 that controls the supply amount of carbon dioxide gas, separately from the monitoring result of the sensor 26, thereby allowing various types of Ancillary effects can be achieved.

That is, in the illustrated concrete wastewater treatment, etc., the raw solution 100 is pumped up by the line mixer 16 by the pump 12, but when the treatment action is completed, the drive of the pump 12 is stopped and the treatment work is completed. achieved.

However, in the conventional apparatus, there are cases in which the treatment is not completed simply by stopping the pump 12. In other words, as mentioned above, in the pumping treatment method shown in the figure, once the treatment is started, the process is not completed due to the siphon phenomenon. Even after the pump 12 has stopped, the stock solution 100 is automatically pumped up to the discharge side, which has the disadvantage of causing unexpected accidents, and there has been a strong demand for countermeasures against this problem.

This embodiment makes it possible to deal with such a situation extremely easily. That is, by supplying a signal to the control end 32, the opening degree of the valve 21 is increased at the end of the work, and the pumping pipe is closed. 14 can be supplied with an excess of carbon dioxide gas. That is, the excessive supply of carbon dioxide creates a large gas tank in the pumping pipe 14, which separates the raw solution side and the discharge side by the gas tank, causing the aforementioned siphon phenomenon. If this is reliably prevented and the excessive supply of carbon dioxide is performed in synchronization with the stoppage of the pump 12, it becomes possible to reliably complete the work, which greatly contributes to automatic operation and the like. Of course, in order to form the gas tank for finishing the work described above, it is possible to simply supply an excess of air in addition to the carbon dioxide gas in the embodiment.

FIG. 2 shows an integrated embodiment of the reaction maturation device according to the present invention, which is made smaller and more compact. The same members shown in FIG. Omitted.

The characteristic feature of this example is that the maturation tank 2
The line mixer 16 is inserted into the tank 0, and the entire device is extremely small and compact.The maturation tank 20 has a vertically long cylindrical shape, and a drain valve 42 is provided in the lower lid 40 of the maturation tank 20. Maturation tank 20
Fixed to the main body and confidential. In addition, maturation tank 20
A line mixer 16 is suspended and fixed to the upper lid 44 via a cap 46.
The lower end thereof opens into the maturation tank 20. A pumping pipe 14 is connected to the upper end of the line mixer 16, and a stock solution 100 is supplied from the lower side of the pumping pipe 14, and a reaction fluid such as carbon dioxide gas 200, for example, is supplied from the upper side of the pumping pipe 14.

A discharge pipe 48 is further connected to the upper lid 44, and the matured processing liquid is discharged to the outside through the discharge pipe 48. A sensor 26 is incorporated in the middle of the discharge pipe 48, and the mature processing liquid is discharged to the outside through the discharge pipe 48. Maturity results within 20 days are monitored.

Furthermore, in this embodiment, a bypass line 28 is connected to the side surface of the lower lid 40 of the maturation tank 20, so that a part of the uniform mixed treatment liquid discharged from the line mixer 16 passes through the maturation tank 20. It will be understood that the water is discharged directly to the outside from the bypass line 28 without being discharged. A control valve 30 is provided in a part of the bypass line 28, and the amount of bypass is adjusted.

As described above, according to the embodiment shown in FIG. 2, by incorporating a line mixer inside the maturation tank 20 and connecting each piping to the maturation tank 20 in an efficient arrangement, a small and compact reaction maturation can be achieved. Such a small device can be easily moved to each construction site, and in some cases can be used as a vehicle-mounted device such as a truck.

In addition, in the embodiment, when supplying carbon dioxide gas from the carbon dioxide gas source 18 to the pumping pipe 14, the pump 12
and valve 21 are operated at the same time, but in such a simultaneous start operation, the carbon dioxide gas may lag behind the stock solution by several minutes, which may cause the initial reaction to be irregular. In order to eliminate such a situation, in the present invention, it is preferable to operate the carbon dioxide valve 21 1 to 2 minutes faster than the pump 12 so that the carbon dioxide gas reacts with the stock solution without delay.

[Effects of the Invention] As explained above, according to the present invention, it is possible to obtain an improved mixing device that can reduce the size of the maturation tank and control the amount of reaction fluid supplied with high precision, and also By arbitrarily adjusting the amount, it becomes possible to provide good compatibility with various stock solutions.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a first preferred embodiment of a mixing device according to the present invention, and FIG. 2 is a perspective view showing a preferred embodiment of a mixing device suitable for the present invention. 14...Sumpling pipe, 16...Line mixer, 18
... Carbon dioxide gas source, 20 ... Maturation tank, 21 ... Valve, 26 ... Sensor, 28 ... Bypass line,
30...control valve, 100...undiluted solution, 200...
... Reaction fluid, 300 ... Processing liquid.

Claims (1)

[Scope of Claims] 1. A line mixer through which a stock solution and a reaction fluid are passed and which stir and mix these fluids; and a line mixer which is connected to the downstream side of this line mixer and which holds the fluid after stirring and mixing to carry out the reaction. A maturation tank for maturing, a measuring device for measuring the properties of the fluid matured in the maturation tank, a control means for controlling the mixing ratio of the stock solution and the reaction fluid based on the measurement results of the measuring device, and a fluid that passes through the maturation tank. A mixing device comprising: a bypass line that discharges water without water; and an adjustment means that adjusts the amount of bypass in the bypass line. 2. The mixing device according to claim 1, wherein the line mixer is provided in a maturation tank.