JPS62289292A - Mixing and screening tank for neutralization treatment device - Google Patents

Abstract

PURPOSE:To make best use of the advantages possessed by an electrolytic proportional control system neutralization device by thoroughly mixing raw water to be treated and neutralizing liquid chemical without using power stirring means and surely returning the treated water beyond the limits of the permissible range to a raw water storage tank without releasing the same. CONSTITUTION:A mixing tank 2 for mixing the raw water 11 to be treated and the neutralizing liquid chemical 12 is segmented to a primary side mixing tank 5 and a secondary side mixing tank 6. These tanks 5, 6 are communicated with each other in the part and flow path forming plates 8 are horizontally installed therein apart at prescribed spacings from each other from above to below. The plates are horizontally installed in such a manner that the upper flow path forming plate is horizontally installed to one flow path forming plate to constitute a flow passage 13 above said plate. A screening tank 3 is provided in the position where the tank accepts the treated water overflowing from the tank 6. A screening valve 21 which can return the treated water to the raw water storage tank when the concn. of the hydrogen ions detected by a paper sensor 16 disposed in the tank 6 is inadequate and which can release the treated water when the concn. of the hydrogen ions is adequate is disposed to the lower part of said screening tank 6.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a mixing and sorting tank in a neutralization treatment device, and more specifically, a method for mixing raw water to be treated and a neutralizing chemical solution, Mixing and sorting in neutralization treatment equipment that allows for sufficient mixing without using a power-driven stirring means and that can reliably prevent the discharge of treated water with an incompatible hydrogen ion concentration (PH value). Regarding tanks.

[Prior Art] As is well known, there are various ways to treat wastewater, one of which is neutralization treatment. This neutralization treatment is a process that suppresses alkaline sewage discharged by cleaning companies and resistant sewage discharged by metal surface processing businesses to within the pH range of 5.8 to 8.8, which is within the allowable range of water pollution laws. . Neutralization devices have conventionally been used to perform such processing.

Conventionally used neutralization equipment has multiple stages of neutralization tanks for storing raw water to be treated and neutralizing chemicals, and the treated water that has been neutralized in the neutralization tank on the -L flow side is transferred to the next stage. It is transferred to a neutralization tank, where it is further neutralized by adding a neutralizing chemical solution, and then transferred to the next stage neutralization tank and the same process is repeated until the above tolerance range is reached in the final stage neutralization tank. Hydrogen ions in the tank +1: Neutralized and discharged.

In order to carry out the neutralization process in multiple stages as in 1U, a large space for installation is required. In addition, the entire device is large-scale and the manufacturing cost is high. Furthermore, since the neutralizing chemical solution described in I-I must be diluted to, for example, 5%, the neutralizing chemical solution must be diluted to, for example, 2% as a pre-process of mixing the neutralizing chemical solution and wastewater.
It takes nearly 0 minutes to dilute, so a dilution tank and accompanying Ifl! Management is necessary.

Conventional neutralization processing equipment has the above problems, so
As an alternative treatment device, the raw water to be treated and the neutralizing chemical solution are mixed in a mixing tank, the mixed treated water is all determined with a PH meter, and a current corresponding to this pH value is used to generate the An electrolytic proportional control neutralization device has been proposed, which uses electrolysis and uses the generated gas pressure to push out a neutralizing chemical solution into the mixing tank.

[Problems to be Solved by the Invention] According to the electrolytic proportional control type neutralizing device described in L, the problems listed in items 1 to 2 above can be solved, but this electrolytic proportional controlling type neutralizing device In order to obtain the best quality, there is a need to thoroughly mix the raw wood to be treated with the neutralizing chemical solution. Furthermore, when the treated water has a specified hydrogen ion concentration, a sorting tank is required to ensure that the treated water is returned to the raw water storage tank without being discharged.

The present invention has been made in view of the above-mentioned points, and its purpose is to mix the raw water to be treated and the neutralizing chemical solution within 1 minute without using any power stirring means. In addition, it is possible to reliably return treated water to the raw water storage tank without discharging treated water that is outside the allowable range.
The advantages of the electrolytic proportional control type neutralization device can be fully brought out.

The present invention provides a mixing and sorting tank in a neutralization processing device.

[Means for solving the problem] The invention has the following technical means to achieve the above object. That is, to explain using the reference numerals used in the attached drawings corresponding to the embodiments, the raw water 11 to be treated and the neutralizing chemical solution 12
Among the treated water 15 mixed in the mixing tank 2, the treated water that meets the predetermined hydrogen ion concentration! It consists of a sorting tank 3 that can discharge 5b and return non-conforming treated water +5a to the raw water storage tank 19. It is divided into
These mixing tanks 5 and 6 are communicated through an opening 7 formed at the lower part of the partition plate 4, and
Inside the mixing tank 2, flow path forming plates 8-m- are installed horizontally at predetermined intervals from top to bottom. - A flow path forming plate on the L side is arranged so that a flow path 13 is formed at When the hydrogen ion concentration of the treated water 15 detected by the pH sensor disposed in the secondary mixing tank at the bottom is not suitable, the treated water 15a can be returned to the raw water storage tank 19, water,
When the ion concentration matches the ion concentration, this matched treated water 1
This is a mixing and sorting tank in a neutralization processing device that is equipped with a sorting valve that can discharge 5b.

[Function] Since the present invention consists of the above-mentioned technical means, the raw water 11 to be treated and the neutralizing chemical solution 1, which are introduced from the second part of the primary mixing tank 5,
2 flows from the upper part of the primary mixing tank 5 to the lower part, and after flowing into the lower part of the secondary mixing tank 6 through the opening 7 formed at the lower part, the water flows into the upper part of the secondary mixing tank 6. is overflowed from. This overflowed treated water 15 is received in the sorting tank 3. A selection valve 21 disposed in a corner of the selection tank 3 operates to return the non-conforming treated water 15a to the raw water storage tank 19 when the hydrogen ion concentration of the treated water 15 is incompatible. Then, when the hydrogen ion concentration of the overflowing treated water 15 is suitable, the selection valve 21 is switched to discharge the suitable treated water 15b to the outside. The hydrogen ion concentration of the treated water flowing into the sorting tank is detected by a pH sensor installed in the secondary mixing tank.

[Example] Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the figure, 1 indicates a mixing and sorting tank, which is composed of a mixing tank 2 and a sorting tank. The mixing tank 2 is vertically long, and the inside is divided into a primary mixing tank 5 and a secondary mixing tank 6 by a partition plate 4 disposed in the center. The next mixing tank 6 is communicated with the opening 7 formed in the lower part of the partition plate 4.

A flow path forming plate 8 is disposed inside each of the primary mixing tank and the secondary mixing tank.

These flow path forming plates 8 are used to transport the raw wood 11 to be treated, which is introduced into the upper part of the primary mixing tank 5"15 from the raw water supply pipe 9 and the neutralizing chemical solution supply pipe 10, which are piped to the upper part of the primary mixing tank 5. and the neutralizing chemical solution 12 are installed horizontally so that they can be sufficiently mixed while passing through the insides of these primary and secondary mixing tanks 5 and 6. The configuration is as follows: That is, one flow path forming plate 8 is provided with another flow path forming plate 8 so that a flow path 13 is formed above it. To explain this specifically, as shown in FIG. Channel forming plates 8.8 are installed horizontally on both sides in order to form wave channels 13 in the upper part of the channel 13. Channel forming plates 8.8 are installed horizontally on both sides of the channel 13.
In order to form a wave path forming plate 8, a wave path forming plate 8 is installed horizontally in the center on the upper side thereof. By reversing such horizontal arrangement, a flow path 13-1 is formed above each of the flow path forming plates 8--.

Next, 14 is an overflow opening formed in the upper part of the secondary side mixing tank 6, and # is used to cause the treated water 15 that has been placed in the mixing tank 2 and has been neutralized to overflow to the outside of the mixing tank 2. It is formed in 16 is a pH sensor disposed at the upper part of the secondary side mixing tank 6, and is disposed to measure the hydrogen ion concentration (PH value) of the treated water 15 overflowing from the overflow opening 14. It is something that exists.

The sorting tank 3 is the treated water 1 that overflowed from the mixing tank 2.
5, and a return port 17 and an outlet port 18 are formed inside.

The return port 17 is formed to return the treated water 15 received therein to the raw water storage tank 19 for storing the raw water 11 to be treated when the hydrogen ion concentration is inappropriate. Return port 17 and raw water storage 4P! +9 is connected via a return pipe 20. Reference numeral 21 denotes a selection valve attached to the return port 17, which can open and close the return port 17 by opening and closing operations of the actuator 22. That is, the selection valve 21 is connected to the selection tank 3.
If the treated water 15 received in the tank is non-conforming, it opens and returns the treated water 15a to the raw water storage tank 19,
When the treated water 15 is suitable, it is closed and stored in the sorting tank 3.

The overflow opening 14 is provided with suitable treated water 15a.
In this embodiment, the suitable treated water 15a can be discharged to the outside of the sorting tank 3 when the liquid level rises due to accumulation of water inside the tank. A discharge pipe 23 is passed inside from the bottom surface 3a of the sorting tank 3, and its end is positioned on one side of the discharge pipe 23.An example is shown in which the opening surface of the end of the discharge pipe 23 is set as the outlet 18. It shows.

The mixing and sorting tank 1 formed in this way is used by being installed in a neutralization processing device, and FIGS. 2 and 3 show an example in which it is installed in an electrolytic proportional control type neutralization device 24. ing.

This neutralization bag 2124 serves as a pump 25 for feeding the raw water 11 to be treated in the raw water storage tank 19 into the primary mixing tank 5, and a pump 25 for feeding the neutralizing chemical solution X2 into the primary mixing tank 5 as well. an electrolyte tank 28 for electrolyzing the electrolytic solution 27 with a current corresponding to the pH value of the pH sensor 16 and feeding the generated gas to the chemical injector 2B. It is composed of a chemical liquid tank 29 for storing a neutralizing chemical liquid, a control section 30 for controlling the entire apparatus, and the like.

The neutralizing chemical solution 12 is acidic when the raw water 11 to be treated is alkaline, and is alkaline when the raw water 11 to be treated is acidic.

Since the mixing and sorting tank 1 of this embodiment is configured as described above, the neutralization device 24 is driven to control the raw water 11 to be treated.
When water is sent to the second part of the primary mixing tank 5 by the pump 25, the raw water 11 to be treated passes through the flow path 13 formed inside and enters the secondary mixing tank 6. , and overflows to the outside from the overflow opening 14 formed at the upper part of the secondary side mixing tank 6. This overflowed treated water 15 then flows into the sorting tank 3. The hydrogen ion concentration of the treated water 15 that has flowed into the sorting tank 3 is measured by a pH sensor 18 installed at the top of the secondary mixing tank 6, and in the case of non-conformity, the control unit 30 sends a message. The actuator 22 operated by the operation signal causes the sorting jj 21 disposed in the return port 17 formed at the bottom of the sorting tank 3 to open. In this case, since the neutralizing chemical solution 12 has not yet been supplied, the hydrogen ion concentration of the raw water 11 to be treated is inappropriate. Therefore, the selection valve 1-1 is opened. Therefore, non-conforming treated water 15 that has flowed into the sorting tank 3
a is raw water amount + P! Since the water is returned to 19, it is not discharged to the outside.

While the treated water 15 that has flowed into the sorting tank 3 is returned to the raw water storage tank 19, the electrolytic solution 27 in the electrolytic tank 28 is electrolyzed by the current based on the measured value of the pH sensor 16. . Gas (hydrogen gas and oxygen gas) generated by this electrolysis is sent to the chemical injector 2B. Since the chemical liquid injector 26 has a sealed structure, when the gas is supplied, the internal pressure increases. Due to this increase in internal pressure, the neutralizing chemical liquid 12 is pushed out and supplied to the upper part of the primary side mixing tank 5 via the neutralizing chemical liquid supply pipe IO. That is, the raw water 11 to be treated and the neutralizing chemical solution 12 flow into the upper part of the -0III mixing tank 5.

These raw water 11 and neutralizing chemical liquid 12 to be treated flow to the lower part through a flow path 13 formed in the primary mixing tank 5, and pass through an opening 7 formed in the lower part of the partition plate 4. It flows into the lower part of the secondary side mixing tank 6 through the flow. Then, it passes through a flow path 13-m- formed in the secondary side mixing tank 6 to reach the upper part, and an overflow opening 14 formed in the upper part.
Flow from to/to the outside. Said flow path 13-m-
is formed by arranging a plurality of flow path forming plates 8-m- as described above, and after passing through one flow path 13, the %ffff forming plates 8! Since the raw water 11 and the neutralizing chemical solution 12 to be treated do not flow uniformly in the primary mixing tank 5 and the secondary mixing tank 6, the flow path forming plate It flows turbulently while colliding with 8-m-. Therefore, the raw water 11 to be treated and the neutralizing chemical solution 12 are sufficiently mixed while flowing in the mixing tank 2.

Therefore, when reaching the upper part of the secondary side mixing tank 6, the raw water 11 to be treated has been neutralized by the neutralizing chemical solution 12 to an appropriate hydrogen ion concentration.

Whether or not the treated water 15 that has reached the upper part of the secondary mixing tank 6 conforms to a predetermined hydrogen ion concentration is determined by a pH sensor installed at the upper part of the secondary mixing tank 6.
6, and if the selection valve 21 is satisfied, the selection valve 21 is closed. By closing the sorting valve 21, the treated water 15 that has flowed into the sorting tank 3 is no longer returned to the raw water storage tank 19 and is stored in the sorting tank 3. As the liquid accumulates, the liquid level in the sorting tank 3 gradually increases. Then, when the liquid level rises to the 2-way position where the outlet 13 is formed, the suitable treated water 15 is discharged to the outside from the outlet 18 by overflow.

As described above, the treated water 15 is discharged to the outside by overflowing after the received treated water is stored inside and the liquid level reaches a predetermined level. Therefore, a certain amount of suitable treated water 15 is always stored in the sorting tank 3.

In this way, the treated water 1 that has been neutralized in the mixing tank 2
5 is discharged from an outlet 18 formed above the sorting tank 3, and during discharge, the hydrogen ion concentration is constantly monitored by a pH sensor 16 disposed at the upper part of the secondary mixing tank 6. is being measured. If the hydrogen ion concentration is unsuitable, the screening valve 21 opens and the treated water 15 flowing into the screening tank 3 is transferred to the raw water front 461.
9.

When the pH sensor 18 measures and the selection valve 21
Even if there is some time lag between the opening operation, in this case, compatible treated water 15 is always stored in the sorter 463, and the treated water flowing in from above is once stored. It sinks into the water, mixes with them, then rises and is discharged from the outlet 18.

Therefore, it takes a certain amount of time for the non-conforming treated water 15a to rise to the outflow port 18, so during this time the sorting valve 21 opens and the treated water stored in the sorting tank 3 is returned to the raw water storage tank and the liquid is Reduce surface level.

Therefore, there is no problem that unsuitable treated water that has flowed into the sorting tank 3 is discharged to the outside from the outlet 18.

The treated water 15 that overflowed from the mixing tank 2 in this way
sinks into the sorting tank 3 and then rises -L upwards, so even if non-conforming treated water 15 flows into the sorting tank 3 from the mixing tank 2, it will not be discharged from the outlet 1B. However, as shown in FIG. 4, the inside of the sorting tank 3 is divided into a primary side 33 and a secondary side 34 by a partition plate 32 with a separator 31 formed at the bottom, and the treated water overflowing from the mixing tank 2 is divided into a primary side 33 and a secondary side 34. 15 is allowed to flow into the primary side 33 and discharged from the upper neck of the secondary side 34, discharge of non-conforming treated water can be more reliably prevented.

In this embodiment, an example is shown in which the flow path forming plates 8---- are provided in both the primary mixing tank 5 and the secondary mixing tank 6, but the flow path forming plates 8-m - may be provided only in one of the mixing tanks.

Furthermore, Fig. 5 shows another example of the sorting valve in the sorting tank. The inside of the sorting tank 3 is divided by a partition plate 35 provided at the vertical center position and a top plate 36 installed horizontally above the partition plate 35. , a treated water outlet 37 is formed in the center of the top plate 38, and the return pipe 20 is connected to the bottom of one non-conforming treated water pool 38 divided by the partition plate 35, and the other compatible treated water pool 39
A discharge pipe 23 is connected to the bottom of the pipe. And partition plate 3
A butterfly type selection valve 41 is rotatably disposed at the upper end of the valve 5 by a valve shaft 40. In this case, the upper end 42 of the selection valve 41 corresponds to the flow [137], and when the hydrogen ion concentration of the treated water 15 does not conform to the predetermined value determined by the pH sensor 16, the selection valve 41 is operated as shown in FIG. The non-conforming treated water 15a is introduced into the non-conforming treated water reservoir 38 along one wall surface 43 of the sorting valve 41, and then returned to the raw water storage tank 19 via the return pipe 20. On the other hand, when the hydrogen ion concentration is suitable, the first selection valve 41 is switched to the opposite side to that shown in FIG.
4 into the compatible treated water reservoir 39, and then discharged through the discharge piping 23.

In this example as well, treated water can be better sorted into compatible and non-compatible water.

[Effects of 1951] - As described in detail, the present invention has the following advantages:
The primary mixing tank 5 and the secondary mixing tank 6 are divided into a primary mixing tank 5 and a secondary mixing tank 6, and the primary mixing tank 5 and the secondary mixing tank are communicated with each other at one end. In addition to forming a long passage for the raw water 11 to be treated and the neutralizing chemical solution 12, a plurality of flow path forming plates 8 are disposed in the passage to prevent the raw water 11 to be treated and the neutralizing chemical solution 12 from turbulent flow. Since the raw water 11 to be treated and the neutralizing chemical solution 12 can be sufficiently mixed without using any power stirring means, This is because when the inflowing treated water 15 is non-conforming, it can be returned to the raw water storage tank 19, and when the inflowing treated water is compliant, the treated water 15 is discharged.

Treated water that is outside the allowable range can be reliably returned to the raw water storage tank without being discharged to the outside, and as a result, the benefits of the electrolytic proportional control type neutralization device can be fully brought out.
It has various advantages such as providing a mixing and sorting tank in a neutralization processing device.

[Brief explanation of drawings]

The accompanying drawings show embodiments of the present invention, and FIG. 1 is a longitudinal sectional view;
Fig. 2 is a front view showing an example of installation in the neutralization device, Fig. 3 is a flowchart for explaining the operation, Figs.
Each figure is a sectional view showing a modified example. In addition, in the figure 1... Mixing and sorting tank, 2... Mixing tank, 3
...Sorting tank, 4...Dividing board, 5...
Primary side mixing tank, 6...Secondary side mixing tank, 7...Opening, 8...Flow path forming plate, 11...Raw water to be treated, 12...Medium Japanese drug solution, 13...channel, 14...overflow opening, 15...
- Treated water, 18...outlet. 19: Raw water storage tank, 21.41: Selection valve. Meku 23 High School 1 Figure Competition 2 Figure A 4th F! Figure 3

Claims (1)

[Claims] A mixing tank for mixing raw water to be treated and a neutralizing chemical solution, and a process for discharging treated water that has been neutralized in the mixing tank and that has a predetermined hydrogen ion concentration. The mixing tank is divided into a primary mixing tank and a secondary mixing tank, and these primary and secondary mixing tanks are In addition to communicating at the bottom, flow path forming plates are horizontally installed inside at predetermined intervals from top to bottom, and the horizontal installation mode is such that one flow path forming plate is connected to the upper side of the flow path forming plate. The upper flow path forming plate is installed horizontally so that a flow path is formed in the upper side, and the above-mentioned sorting tank is located in a position to receive the treated water that overflows from the above-mentioned secondary side mixing tank, and the lower part is a secondary side mixing tank. A selection valve that allows treated water to be returned to the log storage tank when the hydrogen ion concentration detected by the pH sensor located inside is inappropriate, and allows the compatible treated water to be discharged when the hydrogen ion concentration is suitable. A mixing and sorting tank in a neutralization processing device, characterized in that the mixing and sorting tank is provided with.