JP2738647B2 - Solid-liquid separation device with scum storage chamber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed sedimentation basin suitable for initial sedimentation treatment in which sludge in inflow raw water is sedimented by gravity in a sewage treatment system or for final settlement treatment in which solid-liquid separation is performed after aerobic treatment. It relates to a solid-liquid separation device which is applicable to, in particular ska
The present invention relates to a solid-liquid separation device having a storage chamber .

[0002]

2. Description of the Related Art A conventional standard activated sludge treatment system employs a first sedimentation basin (first sedimentation basin) for receiving inflow raw water and sedimenting the sludge by gravity, and a supernatant in the first sedimentation basin. An aeration tank for aerobic treatment by injecting the liquid, a final sedimentation basin for receiving the treated water and performing a final sedimentation treatment of solids (a sedimentation basin for final sedimentation), and disinfecting and discharging the separated liquid The process has a disinfection tank. Here, each of the sedimentation basins for the initial settling and the final settling is composed of a solid-liquid separator having an open top surface.

[0003]

The solid-liquid separation apparatus applied as a sedimentation basin for initial settling and final settling in a conventional sewage treatment system has the entire upper surface open and the entire sewage exposed to the outside. Due to the tank structure, there is a problem that the odor is radiated to the outside and the surrounding environment is harmed, and the efficiency of collecting the floating scum is low. In addition, since the above-mentioned open-type solid-liquid separation tank contains foreign substances such as leaves and algae, it is necessary to perform cleaning to remove them, so that the processing environment becomes extremely poor. There was a problem.

Therefore, it is conceivable to cover the entire upper surface of the solid-liquid separation tank with a cover. In this case, however, an air layer is left above the liquid surface in the solid-liquid separation tank.
The vast surface of the sewage in the solid-liquid separation tank is still in contact with the atmosphere, and thus there is a problem that it cannot be solved fundamentally. For this reason, there has been a problem that not only exhaustion and deodorization are required, but also work and liquid level monitoring in the upper space in the solid-liquid separation tank become extremely difficult. Furthermore, while the metals attached to the upper space are corroded, especially when the solid-liquid separation tank is first used as a sedimentation tank, the environment of the upper space becomes very poor due to methane gas generation and the like. Therefore, there is a problem that the work in the upper space portion involves danger.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the surrounding environment is not contaminated by odors. In addition, the floating scum can be collected efficiently and the liquid level can be monitored. Scum storage that can be performed safely and easily and greatly improves the efficiency of settling sludge treatment
It is an object to provide a solid-liquid separation device provided with a chamber .

[0006]

According to a first aspect of the present invention, there is provided a solid-liquid separation apparatus for performing a solid-liquid separation by introducing water to be treated, and the solid-liquid separation tank being sealed. keep
And the top of the solid-liquid separation tank
The solid-liquid separation tank
To separate the sludge settled at the bottom of the tank.
-Liquid separation consisting of a sludge scraper installed inside
In the apparatus, a part of the top plate of the solid-liquid separation tank includes:
A scum storage chamber is formed above the top plate,
The scum storage chamber has a scum agitator for agitating the floating scum.
Means and a scum discharging means for discharging the scum that stays.
Have

[0007] Solid-liquid separation device according to the invention of claim 2 wherein, said scum stirring means, a spray having a defoaming function
It consists of a device or a mechanical stirrer .

[0008]

According to the first aspect of the present invention, there is provided a solid-liquid separation device.
Liquid level of the solid-liquid separation tank sealed structure is set to the high scum storage chamber than the top plate portion of the solid-liquid separation tank
Thus , the solid-liquid separation tank becomes a closed tank filled with water. Therefore, floating scum solid-liquid separation tank is Ru are collected emerged penetrate the scum storage chamber. And scum storage
In the room, the floating scum is stirred by the scum stirring means.
This causes the sludge held by the scum to settle and
Only scum from which mud has separated and settled out of the system by scum discharging means
By discharging and collecting, the floating surface in the solid-liquid separation tank
The cam can be continuously inserted into the scum storage chamber
You. For this reason, the recovery efficiency of the floating scum is improved, and the solid-liquid
Separation is effectively performed. In addition, the sludge scrap in the solid-liquid separation tank
The floating scum in the solid-liquid separation tank is
Forcibly scrape to the scum storage chamber side, and
Sludge settled at the bottom of the tank is forcibly scraped to the collection side.
Floating scum in the scum storage room
Floating collection is promoted.
Collect and recover the settling sludge that causes the phenomenon without delay,
The rate is further improved.

[0009] Solid-liquid in the invention of claim 2, wherein the separation device
Then, spray device or mechanical type as scum stirring means
Uses a stirring device, and in the case of a spray device, claims
In addition to the same effects as the invention of 1 Symbol placement is obtained, ska
As the foam generated in the storage room can be defoamed and deodorized,
The effect of being able to easily perform visual inspection and inspection work
can get. In the case of a mechanical stirrer, claim 1
The same effect as the above invention can be obtained.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Embodiment 1 FIG. FIG. 1 shows a scum storage for sludge treatment according to Embodiment 1 of the present invention.
It is a schematic sectional drawing which shows the solid-liquid separation apparatus provided with the reservoir . In the figure, 1 is a solid-liquid separation tank applicable as a closed sedimentation basin for initial and final settling of a sewage treatment system, and 1a is provided to keep the solid-liquid separation tank 1 in a closed state.
Vignetting the top plate, 2 solid-liquid separation tank water inlet chamber, which is a partition formed on one side of the 1, 3 is a precipitated sludge collection chamber formed in the bottom side of the raw water entering 2, the sedimentation A sludge pipe 4 is connected to the bottom side of the sludge collection chamber 3.

A scum storage chamber 5 is provided above a part of the top plate 1a of the solid- liquid separation tank 1 above the top plate 1a.
The scum storage chamber 5 is formed in the solid-liquid separation tank 1.
The floating scum is set on the top plate 1a on the opposite side of the settling sludge collection chamber 3.
It is designed to be introduced and retained above. Therefore , in the scum storage chamber 5, the liquid level WL of the solid- liquid separation tank 1 in the fully-filled closed state is set to a position higher than the top plate portion 1a.

The scum storage room 5 also serves as an inspection room , and the scum storage room 5 stays inside the scum storage room 5.
Scum discharge pipe (scum discharge
Stage) 6 and a stirrer for stirring the floating scum in the scum storage chamber 5.
And a spray device 7 as a cam stirring means.
This spray device 7 is used for the liquid level in the scum storage chamber 5.
The scum storage chamber 7 is disposed in the space above the level WL.
Is generated on the liquid surface by spraying water on the liquid surface inside
It has a defoaming function to erase bubbles.

Further, a treated water discharge pipe 8 is connected to the solid-liquid separation tank 1. In addition, the bottom wall 1b of the solid-liquid separation tank 1 is formed as an inclined bottom wall in which the settling sludge collection chamber 3 side is gradually and gradually lowered.

Numeral 9 is housed and arranged in the solid- liquid separation tank 1.
This is a sludge scraping device , and this sludge scraping device 9
Mode and have a blade 9a in series raked is moved along the solid-liquid separation tank 1 top plate portion 1a and the inclined bottom wall 1b
Endless belt that is driven to rotate by the
The scum floating on the upper part of the ink tank 1 is transferred to the scum storage chamber 5 side.
While being settled at the bottom of the solid-liquid separation tank 1
Sludge that has been scraped to the settling sludge collection chamber 3
I have.

Next, the operation will be described. The solid-liquid separation tank 1 having the above-described closed structure becomes full when raw water (suspension) flows in through the raw water inflow chamber 2.
The liquid level WL is set at a position higher than the top plate 1 a in the scum storage chamber 5. For this reason, the scum having a low specific gravity contained in the raw water is levitated and collected toward the scum storage chamber 5 and then discharged and collected from the scum storage chamber 5 through the scum discharge pipe 6 to the outside of the system.

The take-in which case, when operating the sludge raking device 9, moving along the top plate portion 1a of the solid-liquid separation tank 1
The can shifting blades 9a, by being raked in floating scum gas cam storing chamber 5 side of the solid-liquid separation tank 1,
The efficiency of collecting floating scum in the scum storage chamber 5 is improved. Further, the settling sludge on the bottom wall 1b is swept toward the settling sludge collection chamber 3 by the scraping blades 9a moving along the bottom wall 1b of the solid-liquid separation tank 1, thereby collecting the settling sludge. Efficiency is also improved.

Furthermore, air containing odor and microorganisms that occur in solid-liquid separation tank 1, collects in nature and scan cam reserving chamber 5. Here, when water is sprayed from the spray device 7 as scum stirring means toward the liquid surface in the scum storage chamber 5, bubbles collected on the liquid surface are eliminated and deodorized. Since the deodorized air is released into the atmosphere, environmental pollution can be prevented beforehand, and liquid level monitoring and inspection can be performed safely and easily.

Embodiment 2 FIG. FIG. 2 is a schematic sectional view showing a main part of a solid-liquid separation device having a scum storage chamber according to Embodiment 2 of the present invention. In the second embodiment, a mechanical stirrer 11 is disposed as scum stirring means in the scum storage chamber 5 in the first embodiment.
It is. The scum storage chamber is provided by the mechanical stirrer 11.
By stirring the floating scum in 5, the floating scum
Can be separated and settled. Obedience
Therefore, solid-liquid separation can be performed effectively, and sludge
Only the scum after separation can be collected.

FIG. 3 is a flow sheet of wastewater treatment process, in the figure, A is the first precipitation step for pretreatment of the primary sedimentation treatment and biological treatment of the sludge contained in the inflow raw water,
B is an aeration step in which the supernatant from the initial precipitation step A is introduced to perform aeration treatment (biological treatment), and C is a final sedimentation for separating sludge generated by the biological treatment in the aeration step B from treated water. The first and second settling steps A and / or the last settling step C are the solid-liquid separation tank 1
Is applied.

In the solid-liquid separation tank 1 described in the first embodiment, a sludge scraping device 9 is provided inside the
It may have a multi-stage configuration arranged in stages.

[0021]

As described above , according to the first aspect of the present invention, the liquid level of the solid-liquid separation tank having a closed structure is increased.
Installed in a scum storage room higher than the top of the solid-liquid separation tank
The solid-liquid separation tank is full
In the state, the floating scum in the solid-liquid separation tank is
The scum storage room can be floated and collected in the storage room.
Inside, the floating scum is stirred by the scum stirring means.
Then, the sludge held by the scum is settled and separated, and the sludge is
Only the settled scum is discharged out of the system by the scum discharge means.
Therefore, the floating scum in the solid-liquid separation tank is
Can be continuously invaded. As a result,
When the recovery efficiency of the cam is improved and solid-liquid separation is performed effectively
This has the effect. Also, the sludge scraping in the solid-liquid separation tank
Scum in the solid-liquid separation tank
Tank forcibly to the storage chamber side and a solid-liquid separation tank
The sludge settled on the inner bottom of the tank to the collecting side
Of the floating scum in the scum storage chamber
The above-mentioned collection is promoted, and when it stays for a long time, it rots.
Sedimentation that occurs can be collected and recovered without delay, improving treatment efficiency.
There is an effect of further improving .

[0022] In the second aspect of the present invention, scum stirring means
Use a spray device or a mechanical stirrer as
In the case of a spray device, the same as the invention of claim 1 is used.
In addition to the effect, foam generated in the scum storage room
Can be defoamed and deodorized, facilitating liquid level monitoring and inspection work.
Can be obtained. Also machinery
In the case of a stirring device of the type, the same effect as the invention of claim 1 is obtained.
Is obtained.

[Brief description of the drawings]

FIG. 1 includes a scum storage chamber according to a first embodiment of the present invention.
It is a schematic sectional drawing which shows the solid-liquid separation apparatus.

FIG. 2 includes a scum storage chamber according to a second embodiment of the present invention.
It is a schematic sectional drawing which shows the solid-liquid separation apparatus.

FIG. 3 is a wastewater treatment to which the solid-liquid separation device of the present invention can be applied.
It is a flow sheet figure which shows a process.

[Description of Signs] 1 Solid-liquid separation tank 1a Top plate section 5 Scum storage chamber 6 Scum discharge pipe (scum discharge means) 7 Spray device (scum stirring means) 9 Sludge scraping device 11 Mechanical stirrer (scum stirring means)

Claims (2)

(57) [Claims] 1. A solid-liquid separation tank for performing solid-liquid separation by introducing water to be treated and a solid-liquid separation tank for keeping the solid-liquid separation tank sealed.
And a floating plate above the solid-liquid separation tank.
The scum raised is scraped and the bottom of the solid-liquid separation tank is
Inside the solid-liquid separation tank to scrape the sludge that has settled
-Liquid separation device consisting of a sludge scraping device provided in the country
In the solid-liquid separation tank, a part of the top plate
A scum storage chamber is formed above, and the scum storage chamber further includes a scum for stirring the floating scum.
Agitating means and a scum discharging means for discharging the remaining scum
And a solid-liquid separation device provided with a scum storage chamber . 2. The scum stirring means has a defoaming function.
The solid-liquid separation device provided with a scum storage chamber according to claim 1, which is a spray device or a mechanical stirrer .