JPH03207406A - Solid-liquid separator - Google Patents

Abstract

PURPOSE:To control the development of malodor from removed solid by immersing the entire solid-liq. separator in liq. current of a sewage and adjoining a solid removing passage to the separator. CONSTITUTION:A bar screen 4 is horizontally immersed in a passage 3 through which a sewage 2 flows. The sewage is passed through the screen 4, hence solid 1 is separated, and the liq. current 5 poor in solid and rich in water flows to the succeeding stage through a passage 6. Meanwhile, the liq. current 7 which has not been passed through the screen 4, contains the solid 1 and rich in solid and poor in water is introduced into the removing passage 12 having its opening 9 at the end 8 of the screen 4 and isolated from the liq. current 5. A movable weir 13 capable of freely adjusting the water level is furnished in the passage 6 for the liq. current 5. Consequently, the time and effort required for cleaning and removal are reduced.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is a solid-liquid product for treating liquids such as sewage, industrial wastewater, and gray water resulting from human life and production activities to obtain a predetermined water quality. This relates to a separation device.

Conventional technology> The sewage drainage liquid, which contains solid particles such as suspended solids and fecal matter, which can be a hindrance to treatment and disposal, is separated into solids using a screen, which is a solid-liquid separator installed in the flow path. Conventionally, in a solid-liquid separator that separates solid-liquid from liquid, only a portion of the screen is located in the liquid, and most of the screen is placed above the liquid. This is for transferring the solids separated and removed from the sewage liquid by a screen, for example, to a separately provided conveyance means or storage means by some kind of scraping means or scraping means. Further, most of the various claws used in this scraping means or scraping means do not contact the screen and have a certain amount of clearance.

<Problem to be solved by the invention> However, in such conventional solid-liquid separators using screens, solids left behind by non-contact nails remain attached to the screen exposed above the liquid. Solids are exposed to the air, and solids, especially those contained in domestic wastewater, are the cause of odors. In addition, solids exposed to the air eventually dry and stick to the screen, requiring considerable time and effort to clean and remove them.

The present invention has been made by focusing on such conventional technology, and it suppresses the generation of odor from solids separated and removed from sewage drainage liquid, and also prevents the solids from sticking to the screen by drying etc. The present invention aims to provide a liquid separation device.

Means for Solving the Problems In the solid-liquid separator according to the present invention, in order to solve the above problems, substantially the entire solid-liquid separator is normally submerged in the flow of sewage drainage liquid. The solid-liquid separator is adjacent to a passage for removing solids separated from the sewage wastewater, which is separated from the passage for liquid flowing through the solid-liquid separator. In addition to a scraper for removing separated solids, a scraper, which is a plate-shaped blade or brush for removing deposits that can freely come into contact with the surface of the solid-liquid separator, is combined to remove the separated solids from the bottom drainage liquid. The flow path for removing separated solids is also used as a dust reservoir, and the flow path for liquid flow passing through the solid-liquid separator is
A movable weir will be installed to adjust the water level.

Function> In the solid-liquid separator of the present invention configured as described above,
Most of the sewage wastewater that contains solids to be treated passes through a solid-liquid separator such as a bar screen, perforated plate, or filter that is submerged in the liquid flow, and the solids are separated and removed. It becomes a solid/watery liquid stream and flows to the next process. In addition, other sewage drainage liquid flows without passing through the solid-liquid separator, resulting in a liquid flow containing many solids and a small amount of water, and is separated from the flow path of the liquid that flows through the solid-liquid separator. The solids removed from the wastewater flow into a removal channel which also serves as a garbage collection, where they are then subjected to predetermined treatment and disposal.

The scraper, which is a plate-shaped blade or brush for removing deposits that can freely come into contact with the surface of the solid-liquid separator and the scraper combined with the solid-liquid separator, removes the solids separated by the solid-liquid separator. .

A movable weir provided in the flow path of the liquid flow passing through the solid-liquid separator allows the water level to be adjusted freely.

By adjusting the water level of the liquid flow that passes through the solid-liquid separator with this movable weir, it is possible to adjust the water level of the liquid flow that is balanced with the water level and is removed without passing through the solid-liquid separator and flows into the channel. shall be. Then, depending on the amount of solids such as dust, the water level of the liquid stream that does not pass through the solid-liquid separator but is removed and flows into the channel is adjusted as appropriate.

Examples> Examples of the solid-liquid separator according to the present invention will be described below based on the drawings.

In the embodiment shown in FIG. 1 and FIG. 2, a bar screen 4 is provided horizontally in a channel 3 through which a sewage drainage liquid 2 containing solids 1 to be treated flows, and is submerged in the liquid flow. It is something. A liquid stream 5 with a small amount of solids and a large amount of water from which solids 1 have been separated after passing through the bar screen 4 flows through a flow path 6 to the next step. On the other hand, the liquid stream 7 containing a large amount of solids and a small amount of water that does not pass through the bar screen 4 and still contains solids 1 is transferred to the bar screen 4.
It has an opening 9 at its end 8 and is led to a removal channel 12 which is isolated from the liquid flow 5 and is equipped with a gate 11 at an outlet 10 and also serves as a dust reservoir, and is then subjected to a treatment (not shown). The device performs the prescribed processing and disposal.

A movable weir 13 is provided in the flow path 6 of the liquid flow 5 so that the water level thereof can be adjusted freely. By adjusting the water level of the liquid stream 5 with this movable weir 13, it becomes possible to adjust the water level of the liquid stream 7 that is in balance with that water level.

Then, the water level of the liquid stream 7 led to the removal channel 12 which also serves as a dust reservoir is adjusted according to the amount of the solid 1. Furthermore, when the gate 11 of the removal channel 12, which is also used as a dust reservoir, is opened to transfer the solid 1 to the next processing step, it is also possible to raise the water level and wash away the solid 1. This is advantageous for transporting a large amount of solids using a small amount of water when the solids are to be crushed using a crusher or the like in the next processing step. Furthermore, the efficiency of the crushing process is improved because the solids 1 such as garbage can be continuously poured into the crusher simply by raising the water level of the liquid stream 7.

Further, in the case where a device for further separating, removing, shredding, or crushing solids such as garbage is also provided as the next processing step, the processing efficiency can be similarly improved.

The bar screen 4 is equipped with a scraping body 14 that scrapes the solids 1 separated and removed from the lower drainage liquid 2 in the direction of the removal flow path 12, which also serves as a dust collection.The scraping body 14 has a surface of the bar screen 4. A scraper 15 made of a soft material that comes into close contact with the holder is integrally provided.

As the scraper 14 moves, this scraper 15 removes the solids 1 attached to the surface of the bar screen 4 and scrapes them in the direction of the removal channel 12, which also serves as a dust reservoir (see Fig. 7). .

Further, a brush may be used instead of the scraper 15.

The scraping body 14 and the scraper 15 are pushed in the flow direction by the liquid flow of the lower drainage liquid 2 during operation on the bar screen 4.
The power to move 5 is reduced. In addition, the water level on the upstream side of the drainage liquid flow is higher than on the downstream side, bordering on the scraping body l4 and the scraper 15, and due to the water level difference, a lifting force is generated from the back side of the bar screen 4 to the front side on the downstream side. do.

Naturally, a buoyant force acts on the solid l submerged in the water, and due to this lifting force, the solid l deposited or attached to the surface of the screen 4 and its gaps can be easily removed and scraped in the direction of the flow path l2. It will be sent to you.

Each of the embodiments shown in FIGS. 3 to 6 shows other embodiments, and FIG. 3 shows a screen in which the bar screen 4 is prepared for a downward slope in the direction of flow of the lower drainage liquid 2, and the garbage is removed. The bottom 16 of the removal channel 12, which also serves as a reservoir, is on the same level as the end 8 of the bar screen 4.

The embodiment shown in FIG. 4 uses a single curved bar screen 17, but for example, a plurality of curved bar screens 17 may be used in series or in parallel. Further, in the embodiment shown in FIG. 5, the bar screen 4 is connected to the lower drainage liquid 2.
This is to prepare for an upward slope in the direction of flow.

In the embodiment shown in FIG. 6, an arcuate bar screen 18 is vertically submerged in the liquid flow.

The scraping body l4 and the scraper l5 made of soft material provided integrally with the scraping body 14 rotate about the center of the arc-shaped bar screen l8 as an axis l9, and the solid l separated and removed from the lower drainage liquid 2 is scraped onto the bar screen. A multi-solid, small amount of liquid flow that does not pass through 18 and still contains solid 1 is raked in the direction of 20. In addition, solid 1 is separated by passing through bar screen 18.
A scraping rod 24 for scraping off solids 1 adhering to the scraper 15 is fixed to the wall 23 of the removal channel 22 which also serves as a dust reservoir and is isolated from the liquid stream 21 containing a small amount of solids and a large amount of water that has been removed. There is. In the case of this embodiment, the movable weir 14 is not provided in the flow path 25 of the liquid flow 2l having a small amount of solids and a large amount of water, which has passed through the bar screen l8 to separate and remove the solid l.

<Effects of the Invention> The solid-liquid separator according to the present invention has the content as described above, and by keeping almost the entire solid-liquid separator submerged in the liquid at all times, it can be separated from the sewage drainage liquid. The removed solids can also be kept submerged in the liquid at all times. As a result, the solids separated and removed from the sewage wastewater are not exposed to the air and do not cause odor. Furthermore, the solid-liquid separator itself is not exposed to the air, and solids do not dry and stick to the solid-liquid separator, reducing the time and effort required for cleaning and removal. On the other hand, solids in the removal channel, which is also used as a dust collection, can be submerged by adjusting the water level, and the possibility of causing odor is also reduced. In addition, when transferring solids to the next processing step, such as a crusher, it is possible to raise the water level and transfer a large amount of solids with a small amount of water, and it is also possible to transfer them continuously. This also improves the efficiency of subsequent processing.

In addition, by using a scraper that can come into contact with the surface of the solid-liquid separator in addition to the scraper, it is possible to solidify not only the solids separated and removed from the sewage drainage, but also the solids attached to the surface of the solid-liquid separator. It is efficiently removed and scraped up by a scraper that comes into contact with the liquid separator.

In addition, buoyancy acts on solids submerged in water, which also has the effect of reducing the resistance when raking solids together.

Furthermore, when the solid-liquid separator is installed horizontally, a pressing force in the flow direction due to the flow of the sewage liquid acts on the scraping body and the scraper, and the power for their operation can be reduced.

At the same time, due to the lifting force from the back of the screen on the downstream side to the front, which is generated due to the water level difference between the upstream and downstream sides of the sewage drainage liquid between the raking body and the scraper, it accumulates or adheres to the screen surface and gaps. solids can be separated and removed more easily and efficiently.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the solid-liquid separator according to the present invention, excluding the scraping body and scraper, and FIG.
A schematic cross-sectional view of the embodiment shown in the figure combined with a scraping body and a scraper, and FIG. 4 is a schematic sectional view corresponding to FIG. 2 showing still another embodiment of the present invention using a single curved bar screen; FIG. 5 is a schematic sectional view corresponding to FIG. A schematic cross-sectional view corresponding to FIG. 2 showing still another embodiment of the present invention prepared for an upward slope in the flow direction, and FIG. 6 is a schematic cross-sectional view corresponding to FIG. FIG. 7 is a plan view showing another embodiment of the invention, and FIG. 7 is a perspective view of essential parts showing a scraping body and a scraper. 1 ----1 Solid 2 -... Lower drainage liquid 1 3 Movable weir 1 4 Scraping body 5 Scraper

Claims (4)

[Claims] (1) Separate sewage drainage liquid containing solid floating matter and dust such as feces into solid and liquid using a solid-liquid separator such as a bar screen, perforated plate, or filter installed in the flow path. In the solid-liquid separator, the solid-liquid separator is substantially entirely disposed submerged in the liquid flow of the sewage drainage liquid, and the solid-liquid separator is provided with a liquid that flows through the solid-liquid separator. A solid-liquid separation device characterized by having an adjacent flow path for removing solids separated from lower drainage liquid, which is isolated from a liquid flow path. (2) In addition to a scraper for removing separated solids, the solid-liquid separator is equipped with a scraper, which is a plate-shaped blade or brush that can come into contact with the surface of the solid-liquid separator to remove deposits. The solid-liquid separation device according to claim (1), which is combined. (3) Claim (1) or (2) wherein the flow path for removing solids separated from the sewage drainage liquid is also used as a garbage collection.
) The solid-liquid separation device according to any one of (4) The solid-liquid separator according to any one of claims (1) to (3), wherein the flow path of the liquid flow passing through the solid-liquid separator is provided with a movable weir that can freely adjust the water level. Liquid separation device.