JPS6210681B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water clarification device, the object of which is to provide a water clarification device that is equipped with an upward flow type flow separation tank for suspended water and a sedimentation concentration tank provided isolated from this. An object of the present invention is to provide a water clarification device that can prevent sludge from remaining accumulated in an upflow type flow separation tank for a long period of time.

The conventional water clarifier is as shown in Japanese Patent Publication No. 42-25986, namely, an upward flow type flow separation tank for suspended water, which has an inlet for treated water at the bottom and an outlet for clear water at the top. A sedimentation concentration tank provided separately from this, and a substantially liquid crystal structure having an upper end opened at an intermediate portion between the treated water inlet and the clear water outlet in the fluidic separation tank, and a lower end thereof communicating with the sedimentation concentration tank. A flocculation tube perpendicular to the sedimentation tube is provided, and a clarified water riser tube, which is separate from the sedimentation tube and whose lower end communicates with the sedimentation concentration tank, is provided, and the tube communicates with the fluid separation tank at a higher place than the upper end of the sedimentation tube. It was a water clarification device with a similar structure.

In the above-mentioned water clarifier, most of the flocs grown in the fluidized separation tank are stored as a sludge pool in the sedimentation thickening tank via the floc settling pipe, and then the sludge pool is extracted outside the thickening tank. It is something. However, some of the flocs may grow to a large size that cannot be floated to the surface by the upward flow in the fluidized separation tank, and as a result, the flocs are separated from the fluidized separation tank and sedimentation concentration. Sludge accumulates on the top of the partition plate that separates the tank from the sludge pool. A part of the accumulated sludge pool may be fragmented by the flow in the flow separation tank and introduced into the floc settling pipe, but a certain amount of sludge pool will remain in the same position for a long period of time. .

By the way, regardless of whether this sludge pool is made of inorganic substances or organic substances that are difficult to ferment, if the sludge basin is made of fermentable organic substances, the sludge tank ferments during long-term accumulation and produces carbon dioxide gas, methane gas, and sulfide. Hydrogen gas etc. are generated, and these gases become bubbles and adhere to the flocs in the fluidized separation tank, which reduces the specific gravity of the flocs and rises in the fluidic separation tank, clearing the flocs that should originally be separated. It may flow out from the clear water outlet along with the water.
There was an inconvenience that complete turbidity removal was not carried out.

In order to solve the above-mentioned problems, the present invention positions the inlet of the water to be treated of the inlet pipe vertically arranged in the fluid separation tank below the upper end of the floc settling pipe, and forms the partition plate in the shape of a funnel. To provide a water turbidity device in which a sludge storage section is combined with the partition plate, and the sludge collected in the sludge storage section is concentrated and then extracted from the system at any time before fermentation, thereby ensuring complete turbidity removal. It is something to do.

Next, to explain the drawings, FIG. 1 is a central vertical cross-sectional view of a conventional device, in which reference numeral 1 is a fluidic separation tank, and the water to be treated is introduced so that the inlet 3 of the water to be treated is located near the bottom of the fluidic separation tank 1. A pipe 2 is disposed in the fluid separation tank 1, and numeral 4 represents a flock formed in the fluid separation tank by the upward flow of the water to be treated flowing in from the inlet 3 of the water to be treated.

Further, reference numeral 7 is a sedimentation concentration tank separated by a partition plate 8 at the lower part of the fluid separation tank 1.
A discharge port 15b is provided at the bottom.

A flocculation tube 5 consisting of a substantially vertical pipe or tube is disposed between the fluidization separation tank 1 and the sedimentation concentration tank 7, and the upper end of the flocculation tube 5 is inserted into the fluidization separation tank 1 and opened. The lower end is the sedimentation concentration tank 7.
There is an opening for insertion inside.

Reference numeral 6 denotes a clear water section located at the upper part of the fluidic separation tank 1. The top of the sedimentation concentration tank 7 and the clear water section 6 are communicated by a clear water riser pipe 9, and the upper end of the clear water riser pipe 9 is It is constructed so that it always opens higher than the upper end of the floc sedimentation tube 5. Note that the upper end of the flocculation tube 5 is connected to the fluid separation tank 1.
It opens at a higher position than the water inlet 3 to be treated.

2 to 6 show an embodiment of the device of the present invention, and in FIG. 2, the partition plate 8 is formed into a funnel shape, and the sludge storage section 11 is formed by recessing the central part of the partition plate 8 into a concave shape. The introduction pipe 2 is arranged vertically from near the center of the fluid separation tank 1, the water inlet 3 of the introduction pipe 2 is directed toward the sludge storage part 11, and a baffle plate 12 is installed above the sludge storage part 11. The baffle plate 12 is configured to be movable up and down, so that the distance between the baffle plate 12 and the sludge storage section 11 can be adjusted. Further, the water inlet 3 of the introduction pipe 2 extends downward from the upper end of the floc settling pipe 5.

FIG. 3 shows scraping blades 13a and 13b in the embodiment shown in the previous figure.
The scraping blade 13a is arranged at a position to scrape flocs near the partition plate 8 adjacent to the sludge storage section 11, and the scraping blade 13b scrapes the sludge pool near the bottom of the sedimentation thickening tank 7. It is located at the scraping position.

In FIG. 4, a sludge outflow nozzle 14 is provided at the lowest central end of a funnel-shaped partition plate 8, and a bucket-shaped sludge storage section 11 is provided below the nozzle.

In FIG. 5, the sedimentation thickening tank 7 is formed into a funnel shape, and a concave sludge storage part 11 is provided at the bottom end of the tank, and the bottom end of the sludge outflow nozzle 14 provided at the bottom end of the partition plate 8 is It extends to the lower part of the sludge storage section 11. In FIGS. 2 to 5, the sludge pool accumulated in the sludge storage section 11 is extracted to the outside of the system via the discharge port 15a.

In FIG. 6, a sludge outflow nozzle 14 is provided at the lowermost end of the center of the funnel-shaped partition plate 8, and a bucket-shaped sludge storage section 11 is provided below the nozzle, while a sludge reservoir near the bottom of the sedimentation thickening tank 7 is provided. Scraping blade 13 at the scraping position
b.

The present invention has the above structure, and the water to be treated that flows into the fluid separation tank 1 from the water inlet 3 generates an upward flow and forms a flock 4 that flows into the tank.

Further, the clear water that has passed through the flock group 4 and has been clarified rises as indicated by the arrow in the figure, passes through the clear water section 6, and is discharged from the clear water outlet 10 to the outside of the system.

On the other hand, the flocs separated from the water to be treated reduce the porosity of the floc mass 4 and cause the floc mass to rise, causing the excess flocs to fall from the upper edge of the floc settling tube 5 into the tube. Therefore, the floc mass 4 can be held at a position that coincides with the upper end of the floc sedimentation tube 5. The flocs fall through the sedimentation tube 5 and are deposited in the sedimentation and concentration tank 7 at the bottom, where they are dehydrated and concentrated. On the other hand, the clean water separated in the sedimentation concentration tank 7 rises in the clear water rising pipe 9, and is discharged into the clear water part 6 in the fluidization separation tank 1, where the dehydrated and concentrated sludge pool is discharged from the system through the discharge port 15b. It is discharged. The lower end of the floc sedimentation tube 5 is extra protruded into the sedimentation concentration tank 7 to prevent part of the flocs from entering the clear water riser tube 9.

Further, the water to be treated in the tank rises through the gap formed by the tank wall and the floc sedimentation tube 5, and reaches a clear water section 6 whose cross-sectional area rapidly increases from the upper end of the floc sedimentation tube 5 as a boundary. On the other hand, as the operation continues, the porosity of the floc mass 4 decreases, and the portion of the floc mass 4 that is pushed up further above the upper edge of the floc sedimentation tube 5 due to the lifting force of the upward flow overflows the upper edge. It flows and falls into the pipe.

Above the floc sedimentation tube 5, there is an upward flow rising around it, while the upper part of the floc sedimentation tube 5 and the sedimentation thickening tank 7 connected thereto is filled with still clear water. It is not affected by countercurrent. Therefore, the flocs falling in the floc settling tube are not affected by the upward flow and can quickly settle. Therefore, if the floc sedimentation tube is filled with flocs, a strong continuous downward flow is generated in the floc sedimentation tube based on the density difference between the clear water and the floc population, and as a result, the floc sedimentation tube is A strong suction force is generated around the edge, and excess floc can be effectively sucked into the floc sedimentation tube. Furthermore, since the directional flow coincides with the direction of gravity of the flocs, the flocs flow down the floc sedimentation tube at a high velocity, and a clear water riser tube 9 is disposed at the top of the sedimentation concentration tank 7. The clear water accompanied by the flocs settling in the sedimentation concentration tank and the clear water rejected when the flocs settle and accumulate can be discharged into the clear water section 6 of the flow separation tank 1 through the riser pipe 9. . Therefore, inside the device, the flocculation tube 5 is directed downward, and the clear water riser tube 9 passes through the sedimentation concentration tank 7.
There is a substantial upward flow of water.

By the way, when flocs accumulate as a sludge pool on the upper surface of the partition plate 8, the sludge pool is collected in the sludge storage section 11, so that the sludge pool can be extracted out of the system via the discharge port 15a. is possible.

Furthermore, since the baffle plate 12 is provided above the sludge storage section 11, the sludge pool stored in the sludge storage section 11 is prevented from being rolled up into the fluidization separation tank again due to the upward flow within the fluidization separation tank 1. It is possible,
In addition, if the baffle plate 12 is made vertically movable, the distance between the baffle plate 12 and the sludge storage section 11 can be adjusted according to the amount of accumulation in the sludge pool, and the concentration of the sludge pool can be made more efficient. It can be done.

In addition, since the partition plate 8 is formed into a funnel shape,
The mud collection efficiency of the floc is improved, and the scraping blade 13
By using a and 13b, it is possible to further improve the mud collection efficiency.

Next, in the example shown in FIG. 4, a sludge outflow nozzle 14 is provided at the lowest end of the partition plate, and a bucket-shaped sludge storage section 11 is provided below the nozzle 14.
Since the lower end is located at the lower center of the sludge storage section 11, the fluid separation tank 1 is sealed by the sludge accumulated in the sludge storage section 11 and is isolated from the sedimentation thickening tank 7. This has the effect of preventing the sludge pool from being rolled up by the upward flow of water. Also,
In the example shown in FIG. 5, sludge is discharged only from the sludge storage section 11, so the overall structure is simple, operation is easy, and equipment costs are reduced. Therefore, according to the present invention, the sludge pool is not allowed to accumulate in the same position for a long period of time, so even when treating water containing fermentable organic matter, there is no possibility that the sludge will flow out together with clear water. It has the excellent effect of achieving complete turbidity removal.

[Brief explanation of the drawing]

FIG. 1 is a central vertical cross-sectional view of a conventional device, and FIGS. 2 to 6 are central vertical cross-sectional views showing embodiments of the present invention. DESCRIPTION OF SYMBOLS 1... Fluid separation tank, 2... Inlet pipe, 3... Water to be treated inlet, 4... Floe mass, 5... Floe settling tube, 6... Clear water section, 7... Sedimentation concentration tank,
8... Partition plate, 9... Clear water riser pipe, 10... Clear water outlet, 11... Sludge storage section, 12... Baffle plate, 13a, 13b... Scraping blade, 14... Nozzle, 15a, 15b...Exhaust port.

Claims (1)

[Scope of Claims] 1. An upward flow type flow separation tank for suspended water having a treated water inlet at the bottom and a clear water outlet at the top, and a sedimentation concentration tank provided isolated from this,
A substantially vertical block sedimentation tube whose upper end is opened at an intermediate portion between the treated water inlet and the clear water outlet in the fluid separation tank and whose lower end is communicated with the sedimentation concentration tank; In a water clarification device, a clear water riser pipe is separately provided, the lower end of which communicates with the sedimentation concentration tank, and the pipe is configured to communicate with the flow separation tank at a higher place than the upper end of the sedimentation pipe. The inlet of the water to be treated of the inlet pipe vertically arranged in the tank is located below the upper end of the floc sedimentation tube, and a partition plate is formed in the shape of a funnel to isolate the fluid separation tank and the sedimentation concentration tank. A water clarification device, characterized in that a sludge storage section is combined with the partition plate, a discharge port is provided in the sludge storage section, and a baffle plate is further installed above the sludge storage section. 2. The water clarifier according to claim 1, wherein the partition plate is recessed near the center to form a sludge reservoir. 3 Install a sludge outflow nozzle at the bottom end of the partition plate,
2. The water clarifier according to claim 1, wherein a bucket-shaped sludge reservoir is disposed below the nozzle, and the lower end of the nozzle is positioned below the reservoir. 4 The sedimentation thickening tank is formed into a funnel shape, and a concave sludge storage section is provided at the bottom end of the tank, and the lower end of the sludge outflow nozzle provided at the bottom end of the partition plate is a part of the sludge storage section. A water clarification device according to claim 1, which extends to.