JPS59115710A - Solid-liquid separating device - Google Patents

Abstract

PURPOSE:To send a concentrated solid matter independent of the quantity of water, to a sewage treatment plant by providing a tailrace of treated water to a shell part, a discharging part of suspended matter to an upper part, a discharging part of sediment to the bottom center, and an upright cylindrical body to the center, in a solid-liquid separation where a centrifugal force of sewage, etc. is utilized. CONSTITUTION:A sewage, flowed tangentially into a separation tank 2 from an inflow pipe 24, whirls 40 in the inside. At that time, the sewage flows downward along the side wall 22, flows upward at the central part, flows radially toward the outer circumference at the water surface, and flows toward the center at the bottom. The water after passing a screen 9 flows over an overflow weir 31 and is discharged from a pipe 22. The suspended matter at the upper part flows over an upper edge of an overflow trough 49 and is sent to a sewage treating plant. The sediment collected at the bottom is also sent to the sewage treating plant through a pipe 26. Further, a vertical convection current is made smooth by providing an upright cylindrical body 50 and stabilizer plates 38, 39 to the center. The solid-liquid separating capacity of a water to be treated is improved by using this device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid-liquid separator that performs solid-liquid separation of water to be treated, such as sewage and other types of wastewater containing solids.

Overflow water discharged untreated from combined sewer systems during rainy days poses an important problem as a source of water pollution in public waters.

In order to improve overflow water quality, a combined F water overflow adjustment device requires a sewerage system that strengthens two functions. These two roles are to condense solids in sewage and send it to the sewage treatment plant, and to divert excess sewage during rainy days to the effluent, thereby treating the flow rate sent to the sewage treatment plant. Water quality is controlled to keep water within capacity and to improve the quality of water discharged into rivers.

A so-called swirl water diversion tank has been conventionally used as a solid-liquid separation device for use in this overflow regulating device.

An example of a swirl water tank is shown in Figures 1 and 2.
2 is the outer shell of the cylindrical swirl water diversion tank, 2 is the inlet that is located at the F section of the water diversion tank and introduces inflow sewage or wastewater containing pollutants into the tank in a tangential direction, and 3 is the inflow sewage tank. A flow direction control plate for rotating a long distance around the periphery of the tank, 4 a pipe (down shaft) installed in the vertical IU at the bottom of the tank to drain treated water, and 5 a down shaft.
A water collection basin is installed at the top of 1, 6 is an overflow weir installed at the periphery of the water collection basin 5, and 7 is an overflow weir installed around the outer periphery of the overflow weir 6. This is a scum ring placed at a distance to block scum floating on the water surface.

8 is a spoiler, which connects the scum ring 7 to the water collection basin 5 to reduce the rotational energy of the water in the water collection basin 2, scum ring, and overflow dam, increasing the capacity of the down shaft, and increasing the solid-liquid separation efficiency. It enhances the 9 is a scum trap that collects solid substances floating on the water surface and guides them to the bottom of the water collection 5; 1 () is a sewage drain pipe;] 1 is to prevent solids from accumulating on sunny days. Inflow prefecture 2 and sewage 11:zkIi
! 12 is a treated water discharge pipe.

Treatment of inflowing sewage (or wastewater) by the swirl water diversion tank having the above structure is carried out as follows.

Inflow sewage is fed to Inflow Prefecture 2 installed at the bottom of the Swirl water tank.
The sewage is introduced into the tank in a tangential direction, and is raised through the tank while being rotated around the shaft 4 by the flow direction control plate 3. During this time, the sedimented sediment or suspended solids in the sewage are absorbed by gravity and inertia. It settles and collects in the center of the tank,
Sewage 4I [is discharged through small pipe 1 (). The sewage from which sedimentary suspended matter has been removed is filtered by the scum ring 7 to remove the floating substances, and the clear water is removed by the scum ring 7.
The water passes through the lower edge, crosses the upper edge of the overflow weir 6, and collects in the collection basin 5, whose rotational energy is reduced by the spoiler 8, and is discharged as treated water from the treated water discharge pipe 12 through the gun shaft 4 in the morning. Served.

The water surface blocked by the scum ring 7, the bisexual substance floats around the scum ring and becomes a scum trap! ], the water is drawn into the water collection basin 5 by the water flow, and is stored inside the portion of the water collection basin where the overflow weir 6 extends downward. When the water level in the tank decreases, these substances that float on the water surface gather in the center of the tank and are discharged through the wastewater discharge pipe 10.

In sewage treatment using such a swirl diversion tank, when the amount of water is low on sunny days, all the inflow water is guided directly to the sewage pipe along the guide groove and transported to the sewage treatment plant.When it rains, the amount of inflow water is When the water level in the aquarium increases due to the increase in o
Separate the solids as described if. The amount of highly concentrated sewage containing a large amount of solid matter becomes less concentrated as a result of concentration, and is sent from the Orys to the wastewater pipe. On the other hand, the remaining clear sewage water is large in volume and flows over the overflow stream. This overflow water can be further treated or discharged according to the water quality standards of the discharge light.
Two and one.

5: However, this swirl water tank has the following drawbacks.

(1) Separation rate of floating objects with specific gravity less than 1 is poor. Although it has a separation function for floating solids (commonly known as S and S) with a specific gravity of less than 1, there is a limit to the storage capacity because if the water level in the tank does not decrease, the discharge will fail.

Therefore, if this value is exceeded, suspended matter is mixed with the discharged (overflow) water and flows out, resulting in a decrease in separation performance.

When the water level in the water tank is rising and overflowing, the velocity of the flow flowing from the lower end of the scum ring 7 into the overflow weir 6 becomes faster, and this fast flow carries the dimorphic solids that float in the treated water. Since it flows out into the discharge pipe 12, the separation efficiency is low. The reason why the flow rate becomes faster is that when the inflow volume increases to 11 times larger than the amount of sewage flowing out from the sewage JI + outflow pipe, the water level rises and the amount of water overflows, so the amount of water becomes fiery. It's for a reason.

(2) It is inevitable that floating objects must be separated and discharged constantly.

For example, it is natural that it occurs constantly during rainy weather.

Swirl type water tank simply stores the separated floating solids in the lower part of the water collection basin, and does not have the function of discharging them to the outside of the water tank until the water level drops.1. If anything,
This is because the solids float in the water and are blocked by a layer of water between the sewage discharge pipe provided at the bottom of the tank and the lower layer of the accumulated solids. Therefore, the floating solids contained in the inflowing sewage after the water level rises by -L are collected by the flow that flows from the lower end of the scum ring over the overflow weir (with a high flow rate) rather than being collected by the scum trap 9. Therefore, the amount of energy that is accompanied by ) increases.

(3) It is difficult to discharge the precipitate.

A scum ring, trap, and scum ring are installed to collect floating solids, which reduces the development of secondary flow within the tank.
Write one book. Therefore, solids with a large specific gravity settle at the bottom and rarely move to the open part of the sewage discharge pipe. Therefore, when the weather is clear, the crucibles are manually removed.
Maintenance such as cleaning is required (4) Solids can easily clog.

Since the swirl type is equipped with scum rings, scum traps, etc., there is a possibility that large solids may become entangled with these and become clogged.

The present invention eliminates the drawbacks of the conventional ones, by collecting floating solids on the surface of the water and collecting settling solids in the center of the bottom surface for effective discharge. The object of the present invention is to provide a solid-liquid separator that can be operated continuously even in rainy weather.

The present invention provides an inflow system in which water to be treated flows into a tank having approximately circular side walls and a bottom surface in a tangential direction to the side walls.
”, and at least one of the side wall and the bottom surface is connected to a discharge area for guiding the treated water after separation treatment to the outside of the tank.
and a precipitable solids discharge part that guides the concentrated liquid containing a large amount of separated precipitable solids to the outside of the tank, approximately in the center of the bottom surface, and a -1 part of the side wall that overflows to collect a large amount of suspended solids. This solid-liquid separator is characterized by comprising a floating solids discharge section that guides the concentrated liquid contained therein to the outside of the tank.

Embodiments of the present invention will be described using the drawings.

ff In Figures 13 to 5, minute^1 [tank 21 is
It has a side wall 22 and a bottom surface 2 of a substantially circular shape (a similar circular shape such as a circle, an ellipse, an ellipse, or a spiral shape). The inflow 112!'i of the inflow pipe 24 is provided on the side wall 22 so that the liquid in the separation tank 21 can be introduced in a tangential direction and given a swirling motion to the liquid in the separation tank 21.
The bottom surface 23 may be sloped from the outer periphery toward the center. A slope is more effective for accumulating at the center of the bottom.

A bottom discharge pipe 26 is provided at the center of the bottom surface 23 of the II tank 21, and the precipitable solids contained in the liquid to be treated are collected and separated at the bottom by swirling flow and secondary flow, as described later. The tank is then discharged to the outside of the tank together with the concentrated liquid to be treated.

Furthermore, when the amount of liquid flowing into the separation tank 21 decreases, the solid liquid stored in the tank is discharged to the outside of the tank.

An overflow gutter 45) is provided by cutting out a part of the side wall 22 of the separation tank 21 to form a floating solids discharge section. The over 70 gutter 49 may be provided around the entire circumference of the -L portion of the side wall 22 so that it extends over the entire periphery. In addition, the floating solids and scum accumulated in the vicinity of the free surface 28 formed at the - side of the separation tank 21 are removed from the free surface 28h/r] over 70-gutter 4.
It is discharged to the outside of the tank as a concentrated liquid together with the liquid to be treated that flows in in May.

Since a fixed amount of settled and floating solids are continuously removed from the bottom drain pipe 26 and overflow gutter 49 to the outside of the tank, the solids concentration in the separation tank 21 cannot exceed two limits. do not have. Therefore, the solid matter removal rate of the separation tank 21 does not decrease, nor does the processing capacity decrease. Bottom discharge pipe 2
6 and the overflow gutter 49 form a concentrated liquid discharge section that guides the concentrated liquid containing a large amount of solids to the outside of the tank. As long as the precipitates or suspended matter are removed in advance, only one of them may be used.

The side wall 22 of the separation tank 21 is provided with a discharge port having a screen 2 ( ).
This is to allow only liquid to pass through. This discharge [-J has an appropriate length both in the circumferential direction of the tank side wall and in the force direction F. To deal with a fire rat, use the fire heat (J° method) in two directions.

1 position in the outlet with screen 29 inlet 1-12
5 along the inner periphery of the side wall 22 as far as possible.

Use the structure described in the book.

An overflow weir 31 is provided downstream of the screen 29. The setting is such that when the amount of liquid flowing into the separation tank 21 exceeds a certain value and the water surface of the separation tank 21 reaches the upper edge of the overflow of the overflow gutter 49, the liquid flows out over the overflow weir 31. It is preferable to do so.

An overflow pipe 32 is provided on the F flow side of the overflow weir 31 and connected to a river or the like. This can be achieved by removing pollutants from water that exceeds the amount that can be treated at water treatment plants due to increased rainfall and releasing it into rivers, etc.

Reference numeral 50 denotes a vortex prevention part shrine formed by an upright columnar body, and has the function of preventing a vortex from being generated at the center of the free surface 28 due to swirling flow. In addition, the secondary flow, Kamiheki-ryu, is stably formed.

38 and 3 are stabilizers.

The operation of the second embodiment will now be explained.

The sewage that has flowed into the separation tank 21 through the inflow pipe 2.1 (25) circulates in the tank as a swirling flow in the direction of the arrow /1.1.1, and floats in the opening. The solids rise above the water surface 7, and the precipitable solids settle on the bottom 23.

On the other hand, due to the swirling flow inside the tank, the side wall 2 as shown by the arrow 41
2, toward the center along the bottom surface 23, -1-■ along the outside of the vortex prevention member 50, and the free surface 28
This creates a secondary flow that circulates along the periphery. The solid matter that has settled on the bottom surface 23 gradually gathers due to gravity due to the slope of the bottom surface 2. extracted more effectively.

In addition, relatively light floating solids float to the top of the overflow gutter and overflow from the edge of the four overflow channels, but solids with a specific gravity close to 1 are swept up into the swirling flow and are easily separated by flotation. Not done. In this embodiment, a secondary flow occurs as shown in -, so the floating solids are guided to the free surface 22, and the overflow gutter ↓! The overflow of J can easily reach H, and removal by over 70- is easily performed. side wall 2
If overflow is performed around the entire circumference of 2, the centrifugal force of the swirling flow will cause the flow to flow easily and reliably.

In this embodiment, only the vortex prevention member (() is provided in the tank 21, and there is nothing to disturb the smooth movement of the vortex prevention member 4'4'30). However, the bottom 22
It prevents the secondary flows that gather toward the center along the It is reliably formed.

The treated water from which solids have been separated by discharging the concentrated liquid containing a large amount of solids from the bottom conduit 26 and the four overspouts 70 is discharged to the screen 2 of [1].
It passes through slit 9 and flows out of the tank, and is discharged into the river.

In this case, even if the amount of liquid flowing into the separation tank 21 is higher than the design value, or if a large amount of solid matter is mixed in,
The flow of solids is prevented by a screen 2': 3 provided at the outlet, and the solids are stored in the separated GTC tank 21 and are collected together with the liquid from the bottom of the separation tank 21 or the two parts. It is discharged into a tank.

Therefore, since the solids are not completely separated from the liquid as in the conventional rotary type or scraping type automatic descaling method, it is possible to transport the driftwood using a pump or head, and the solids removed as in the conventional methods are not completely separated from the liquid. There is no need to put things in containers and transport them by car, etc., and operating costs can be reduced.

Depending on the installation position of the separation tank 21, the liquid flowing out from the discharge 1-1, the bottom discharge pipe 26, and the over 70-gutter 49 may be pushed out by a pump if it cannot be discharged naturally.

In that case, it is preferable to provide a suitable reservoir for regulation between each outlet of the tank and the pump.

FIG. 6 shows the inlet n of another embodiment, and the inlet 25 is formed at the lower side or the bottom 23 and is inclined in the direction of the internal force. The solids tend to collect in the center of the tank while leaving the inflow 1': I25, #l=easy to exit.

FIG. '7 shows an inlet 25 of another embodiment, in which the ceiling plate 51 on the -1- side is inclined upward toward the center. Floating solids tend to collect in the section 13 along the slope, and after leaving the inlet 25, they are easily separated. The bottom edge may be horizontal and only the top edge may be tilted. vertical wall 52
The ceiling plate 51 may extend further into the tank than the wall 22.

Since this embodiment is constructed and operates as described above, it has the following effects.

(1) Float with a small specific gravity, fraction of dimorphic solids It! Good Ill rate.

(2) Floatable solids with low specific gravity can be constantly extracted outside the tank during rain and sent to the treatment plant (3) Sediments with high specific gravity can be constantly extracted from the bottom of the tank without being deposited on the bottom of the tank. It can be discharged outside.

In this example, a secondary flow is developed. Therefore, the solids that have settled on a constant surface flow toward the center of the tank by the secondary flow, are accumulated, are concentrated, and are discharged out of the tank from the top outlet pipe at the bottom. If the bottom of the tank is sloped so that it is lower than the center or the outer periphery as shown in Figure 4, the secondary flow will become stronger, improving the separation effect and increasing the degree to which sediment accumulates in the center. It is concentrated and discharged through the bottom discharge pipe.

(4) Because the mechanism is simple, it is difficult for solid objects to get stuck.

Since the structure of this embodiment is extremely simple, there is no fear of solid matter clogging, and therefore maintenance can be simplified.

According to the present invention, it is possible to provide a solid-liquid separator that can effectively and reliably separate and remove not only precipitable solids but also floating solids, and can perform removal work at all times even in the rain. Above all, it is possible to achieve a very large effect.

[Brief explanation of the drawing]

Figure 1 is a plan view of an example of a conventional swirl water tank;
3 is a plan view of an embodiment of the present invention, FIG. 4 is a sectional view taken along lines E-E and F-F, and FIG. 3 (cross-sectional view taken along the line i-G, FIG. 6, and FIG.
It is a corresponding view of the H-line cross section. 1. Outer shell, 2. Inflow prefecture, 3. Flow direction control plate, 4.
Dam shaft, 5... Water collection basin, 6... Overflow weir, 7
・・Scum ring, 8・・Spoiler-153・・Scum trap, 10・・Sewage discharge pipe, 11・・Guiding groove, 12・・
- Treated water drain pipe, 21... Separation tank, 22... Side wall, 23
・・Bottom surface, 24・・Inflow pipe line, 25・・Inflow port, 26・
・Bottom discharge pipe, 28.・Free surface, 29.・Screen, 30.・Removal (multiple structures, 31J・Overflow girder, 32.・Overflow pipe, 34.・Slit, 38. 3・・Stabilizing plate) , 40
141...arrow 1 thing 1. =I ri...over 70-4;
Dedication 50... Uzuban 11" part shrine, 51... Ceiling board, 52...
・Vertical wall. Special ii'1111' + I-Kinjin Co., Ltd. (1 Ebara 1' with 3111 people's dialect + II + 1, T-Ill)
Minoru Figure 3 Figure 4-'' □ One piece of material 22 38. 25 2. 38 51 5

Claims (1)

[Claims] 1. An inlet 1 for causing water to be treated to flow into a tank having a substantially circular side wall and a bottom surface in a tangential direction with respect to the side wall.
-1, a discharge port for guiding the treated water after the separation treatment to the outside of the tank at least in one of a part of the side wall or the bottom part in 111j, and a separation in the central part of the front bottom face in iYj. The precipitable solids discharge part and the part of the side wall described in 1iij are drawn over 70° to direct the concentrated liquid containing a large amount of suspended solids to the outside of the tank. A solid-liquid separator comprising: a floating solids discharge section for guiding the solid matter; 2. Inflow of water to be treated into a tank having approximately circular side walls and a bottom surface in a tangential direction to the side walls 1-1
and an outlet for guiding the treated water after the separation treatment to the outside of the tank, at least on one of the part of the side wall or the part of the bottom surface,
Precipitate separated approximately in the center of the bottom +! 1: A precipitable solids discharge part that leads a concentrated liquid containing a large amount of solids to the outside of the tank, and a floating solids discharge part that causes a two part of the side wall to overflow and leads a concentrated liquid that contains a large amount of floating solids to the outside of the tank. What is claimed is: 1. A solid-liquid separator comprising: a discharge section; and a columnar body standing upright in the center of the tank.