JP3051500B2 - Sedimentation concentrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for clarifying suspended water such as industrial wastewater, and in particular, has both a function of settling sedimentable particles and concentrating the same and a function of removing floating scum. The present invention relates to a sedimentation and concentration device.

[0002]

2. Description of the Related Art Generally, suspended water having a high ratio of sedimentable particles is treated by a sedimentation / concentration device, and suspended water having a high ratio of floating scum is treated by a pressure flotation device. However, in the case of a suspension containing both sedimentable particles and floating scum, it is expensive and very uneconomical, especially if a relatively small amount of raw water is treated with two units. Therefore, conventionally, a sedimentation / concentration device configured to take out sedimentable particles by sedimentation / concentration and remove the floating scum by floating is proposed.

As shown in FIG. 2, in a conventional sedimentation / concentration apparatus, a supply cylinder 2 is provided above a tank body 1,
A coagulation tank 4 is connected to the supply tube 2 via an introduction pipe 3. In the flocculation tank 4, the raw water and the polymer flocculant are stirred by the stirrer 5 to promote flocculation of the suspension. A sedimentation promoting cylinder 6 having a flared slope is disposed below the supply cylinder 2, where the sedimentation particles P in the suspension water are provided.
Sinks rapidly, and the floating scum S floats on the liquid surface. The sedimentable particles P are concentrated at the bottom of the tank main body 1, are scraped by the rotation of the scraper 8 driven by the motor 7, and are discharged from the slurry discharge pipe 9 to the outside. The clarified water flows into the settling accelerating cylinder 6, from which the riser pipe 10 and the outlet pipe 1
It flows out through 1. Floating scum S floating on the liquid surface
Is regularly sampled by workers.

[0004] Conventionally, there is also known a technique of removing the floating scum S floating on the liquid surface from the periphery of the supply cylinder 2 by overflowing. Further, as a sedimentation-concentration device provided with the sedimentation promoting cylinder 6 and the scraper 8, there is Japanese Patent Publication No. 57-432.
The technology disclosed in Japanese Patent Publication No. 84 and Japanese Patent Publication No. 2-62282 is known.

[0005]

However, according to the conventional sedimentation / concentration apparatus, the floating scum S is floated on the surface of the liquid and removed, so that it takes a lot of labor to pump the scum S or a large amount of suspended scum S together with the floating scum S. There were problems such as turbid water overflowing. Further, there is also a problem that the floating scum S generated from the concentrated layer enters the settling promoting cylinder 6 and flows out together with the clarified water. Therefore, an object of the present invention is to provide a sedimentation / concentration device capable of automatically and efficiently removing a floating scum.

[0006]

In order to solve the above-mentioned problems, a sedimentation-concentration apparatus according to the present invention includes a cover plate provided at an upper end portion of a tank body, and a supply cylinder provided at a substantially central portion of the cover plate. The suspension pipe is connected to the supply pipe at a position above the lid plate, a settling-promoting pipe with a flared slope is provided below the supply pipe, and a slurry discharge pipe is provided at the bottom of the tank body. A scum collection tube with a scum collection tube that has an upwardly expanding inclined surface that collects floating scum in suspended water is housed inside the sedimentation promotion tube, and a clear water passage port is formed at the lower end of the scum collection tube A riser pipe is erected at the upper end of the sedimentation promotion cylinder, an outflow pipe is connected to the riser pipe at a position above the lid plate, and a scum discharge pipe communicating with the upper periphery of the scum collection cylinder is set up on the sedimentation promotion cylinder. The upper end of the scum outlet pipe is opened near the lower surface of the lid plate, and a tank having a height corresponding to the upper end of the scum outlet pipe is provided. Configured scum outlet provided in the body.

[0007]

According to the sedimentation / concentration device of the present invention, the floating scum in the suspension water floats in the process of the suspension water flowing down the settling accelerating cylinder and is collected on the lower surface of the lid plate. The floating scum remaining in the clear water and the floating scum generated from the concentrated layer are collected by the scum collecting cylinder inside the settling accelerating cylinder,
It is collected on the lower surface of the lid plate through the scum outlet pipe. The suspension inlet pipe is located above the lid plate, and the water level of the supply cylinder is higher than the scum collection layer, so the floating scum that has been densely aggregated on the lower surface of the lid plate due to this water level difference goes outside from the scum discharge port. Emitted forcibly. Therefore, the floating scum can be automatically and efficiently removed without using manual means or a discharging means such as a pump.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, in the sedimentation and concentration apparatus of this embodiment, a tank body 1 is formed in a cylindrical shape, and a lid plate 13 is fixed to an upper end thereof. The supply tube 2 is installed at the center of the cover plate 13, the upper end of which is located at the same height as the upper end of the tank body 1, and the lower end thereof is located below the cover plate 13. The supply tube 2 has an inlet tube 3 and a cover plate 1
3 and is connected to a coagulation tank 4 similar to the conventional one. The cover plate 13 is provided with the air vent tube 12 provided upright.

On the lower side of the supply cylinder 2, a sedimentation promoting cylinder 6 having a flared conical inclined surface is disposed, the upper end of which is inserted into the supply cylinder 2, and the lower end of which is supported by a support piece 14. It is supported on the inner wall surface of the tank body 1. A rising pipe 10 is connected to the upper end of the settling promoting cylinder 6, and an outflow pipe 11 is connected to the rising pipe 10 at the same height as the introduction pipe 3. A rod 15 is inserted into the inside of the riser pipe 10 and the settling promoting cylinder 6, and a scraper 8 is fixedly provided at a lower end thereof, and a motor 7 for rotating the scraper 8 is connected to an upper end thereof. A slurry reservoir 16 is formed at the bottom of the tank body 1, and a slurry discharge pipe 9 is connected thereto. The slurry discharge pipe 9 is connected to a sludge tank (both not shown) via an electromagnetic valve.

Inside the sedimentation promoting cylinder 6, a scum collecting cylinder 17 having an upwardly expanding conical inclined surface for collecting the floating scum S in the suspension water is accommodated and fixed, and at the lower end thereof, clear water is provided upward. Is formed. A scum outlet pipe 19 is provided upright on the outer surface of the sedimentation promoting cylinder 6, and the lower end thereof communicates with the upper outer periphery of the scum collecting cylinder 17, and the upper end is opened near the lower surface of the cover plate 13. ing. A scum discharge port 20 is provided in the tank body 1 at a height corresponding to the upper end of the scum outlet pipe 19. The scum discharge port 20 is also connected to the sludge tank via an electromagnetic valve (not shown).

In the settling and concentrating apparatus of this embodiment constructed as described above, the raw water and the polymer flocculant are rapidly stirred in the condensing tank 4 by the stirrer 5 to promote flocculation of the suspension. The suspension water containing the floc product is introduced into the supply tube 2 through the introduction pipe 3. In the supply tube 2, the suspended water is stirred at a slow speed by the swirling water flow, and flocculation is further promoted. In this state, the suspended water is supplied from the lower end opening of the supply tube 2 to the periphery of the settling promoting tube 6. In the sedimentation promoting cylinder 6, the sedimentary particles P in the suspension water are rapidly settled by the action of the inclined surface, and the floating scum S floats and is collected on the lower surface of the cover plate 13. The sedimentable particles P that have settled below the sedimentation promoting cylinder 6 are concentrated at the bottom of the tank body 1 and are scraped by the slurry reservoir 16 as the scraper 8 rotates. When the electromagnetic valve connected to the slurry discharge pipe 9 is opened, for example, several times a day, the concentrated slurry in the slurry reservoir 16 is discharged to the sludge tank through the slurry discharge pipe 9.

The primary clarified water from which the sedimentable particles P have been separated flows upward into the sedimentation promoting cylinder 6 and is decelerated in the course of passing through the passage 18 of the scum collecting cylinder 17. The sedimentation of the remaining fine sedimentable particles P is promoted, and the clarity of the primary clarified water is improved. The secondary clarified water that has passed through the passage port 18 rises in the riser pipe 10, overflows from the outflow pipe 11, and flows out to an external clarified water tank (not shown).

On the other hand, the floating scum S remaining in the primary clarified water and the floating scum S generated from the concentrated layer of the sedimentary particles P are trapped on the outer periphery of the upper part by the action of the inclined surface of the scum collecting cylinder 17. From the scum outlet pipe 19 to the lower surface of the cover plate 13. When the electromagnetic valve connected to the scum outlet 20 is opened, for example, several times a day, scum agglomerated at a high density on the lower surface of the cover plate 13 is discharged to the sludge tank through the scum outlet 20. .
At this time, since the introduction pipe 3 is located above the cover plate 13 and the water level in the supply cylinder 2 is much higher than the scum collection layer,
The floating scum S is forcibly discharged by this water level difference. Therefore, the floating scum S can be automatically and efficiently removed without using manual means or a discharging means such as a pump.

The present invention is not limited to the above embodiment. For example, the sedimentation promoting cylinder 6 and the scum collecting cylinder 17 may be formed in a pyramid shape, and the scum outlet pipe 19 and the scum discharge port 20 may be respectively formed. The shape and configuration of each part may be appropriately changed and embodied without departing from the spirit of the present invention, such as by providing a plurality of pieces or omitting the scraper 8.

[0015]

As described above in detail, according to the present invention, the floating scum is collected by the scum collecting cylinder, collected on the lower surface of the cover plate, and forcibly discharged using the difference in water level. With such a configuration, there is an excellent effect that the floating scum can be automatically and efficiently removed without using any manual or discharge means such as a pump.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sedimentation / concentration apparatus showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional sedimentation / concentration device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tank main body, 2 ... Supply cylinder, 3 ... Introduction pipe, 6 ... Settling promotion cylinder, 9 ... Slurry removal pipe, 10 ... Rise pipe, 11 ... Outflow pipe, 13 ... Cover plate, 17 ... Scum collection cylinder, 18 … Passage,
19: scum discharge pipe, 20: scum discharge port, P: precipitated particles, S: floating scum.

Claims (1)

(57) [Claims] 1. A cover plate (1) is provided on an upper end of a tank body (1).
3) is provided, and a supply tube (2) is installed substantially at the center of the lid plate (13), and a suspension pipe (3) is connected to the supply tube (2) at a position above the lid plate (13). A sedimentation promoting cylinder (6) having a flared slope is disposed below the supply cylinder (2), and a slurry discharge pipe (9) is connected to the bottom of the tank body (1) to promote sedimentation. Inside the tube (6), a scum collecting tube (17) having an upwardly-spreading inclined surface for collecting floating scum in the suspension water is accommodated, and clear water is provided at the lower end of the scum collecting tube (17). A passage (18) is formed, and a riser (10) is erected at the upper end of the settling promoting cylinder (6), and an outflow pipe (11) is placed on the riser (10) at a position above the lid plate (13). The scum discharge pipe (1) is connected to the scum discharge pipe (1), and a scum discharge pipe (19) communicating with the upper periphery of the scum collection pipe (17) is erected on the settling promotion pipe (6).
The upper end of 9) is opened near the lower surface of the lid plate (13), and the scum discharge port (20) is provided in the tank body (1) having a height corresponding to the upper end of the scum outlet pipe (19). Characterized sedimentation and concentration equipment.