JPH105505A - Device for separating solid from liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily peel the suspended materials settled on plate surfaces and to effectively utilize the plate surfaces as well by making the inclined plates freely oscillatable and changing the angle of inclination thereof. SOLUTION: A settling basin 1 is provided with an inflow section 2 on its one side and is provided with an outflow section 3 on the other side facing the same. This outflow section is provided with the device 6 for separating solid from liquid having the inclined plates 5 for accelerating the settling of the suspended materials near the outflow section. This device 6 for separating solid from liquid freely oscillatably supports the respective plural inclined plates 5 on the side walls of the settling basin 1 by connecting the lower side of the inclined plates 5 and the side walls of the settling basin 1 by hinges 7. Further, the upper sides of the respective inclined plates 5 are interconnected by connecting members 8. These connecting members 8 are connected to the arm section 9a of a driving device 9. When the suspended materials are settled on the surfaces of the inclined plates 5, the arm section 9a of the driving device 9 is moved in and out to oscillate the inclined plates 5 and to peel the suspended materials. Then, the degradation in the performance for separating solid from liquid of the inclined plates is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-liquid provided in a sedimentation pond, such as a sedimentation pond of a water purification plant or a sewage treatment plant, for separating suspended substances in inflowing treated water by gravity and discharging supernatant water. It relates to a separation device.

[0002]

2. Description of the Related Art For example, in a sewage treatment plant, a first sedimentation basin as a primary treatment facility and a final sedimentation basin for separating activated sludge after secondary treatment are installed. These sedimentation basins are generally rectangular horizontal flow sedimentation basins, in which the water to be treated flows in from one side to settle suspended matter (SS) in the water to be treated by gravity, and the supernatant water flows out from the opposite side. It is made to let. In such a sedimentation tank, the length of the tank in the flow direction must be increased in order to secure a sufficient settling time, or the width of the tank must be increased in order to reduce the flow velocity. It will be big.

However, at present, it is difficult to obtain a large tank surface area. Therefore, when the standard activated sludge method is adopted, the sedimentation basin is initially operated with a treated water amount of about 35 m ³ / m ² / day. SS removal rate is about 40%,
There is a problem that the separation efficiency is not always good.

[0004] In order to solve the problem of separation efficiency, a method of providing a filter material filling section inside a sedimentation basin, or providing a filter material filling device outside the pond, and allowing the water to be treated to pass through the filter medium layer has also been implemented. I have. However, this method not only requires a filter medium, but also has a low porosity between the filter media, so that clogging is likely to occur, and frequent cleaning must be performed to prevent clogging.

[0005] On the other hand, an inclined plate is known as a solid-liquid separator capable of maintaining a high porosity. The inclined plate is configured such that a plurality of thin plates are provided with an inclination in the water to be treated, and the sedimentation of suspended substances is promoted by passing the water to be treated between the inclined plates.

[0006]

However, in the above-mentioned conventional inclined plate, a method for removing suspended substances settled on the surface of the plate is not particularly taken. There is a problem that the separation efficiency tends to be reduced when the contained water to be treated is subjected to solid-liquid separation.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a solid-liquid separation device which can suppress the deposition of suspended substances on the inclined plate surface and can efficiently separate solid-liquid. Things.

[0008]

In order to solve the above-mentioned problems, the solid-liquid separation device according to the first aspect of the present invention is disposed in the water to be treated in a pond at an appropriate angle with respect to the flow direction. A plurality of inclined plates for facilitating sedimentation of suspended matter, supporting means connected to one side of each inclined plate for swingably supporting each inclined plate at a predetermined position in a pond; And a driving means provided to be connected to the other side of the plate to drive the swing of each inclined plate.

According to a second aspect of the present invention, there is provided a solid-liquid separation device as described above, wherein a diffuser is provided below the inclined plate. The solid-liquid separation device according to claim 3 is provided in the vicinity of the supernatant water outflow portion in the sedimentation basin separated into the treated water inflow side and the supernatant water outflow side by a partition wall having an opening at a lower portion. is there.

According to the above-mentioned structure, the other side of each inclined plate is moved by the driving means to change the inclination angle of the inclined plate, so that the suspended particles settled on the surface of each inclined plate. The substance can be peeled off, and both sides of the inclined plate can be used.

According to the second aspect of the present invention, the air is jetted from the air diffuser to wash the plate surface with the rising air bubble flow and the rising water flow generated thereby.
Suspended substances settled on the plate surface can be peeled off.

According to the third aspect of the present invention, the water to be treated flows through the zone on the inflow side of the water to be treated toward the partition wall, and then passes through the lower opening of the partition wall to the zone on the outflow side of the supernatant water. And flows upward in this zone to impinge on the inclined plate. As a result, most of the suspended solids in the water to be treated are gravity-sedimented in the zone on the inflow side of the treated water, and the remaining suspended matter is efficiently gravity-sedimented in the zone on the outflow side of the supernatant water. This promotes the sedimentation of the suspended matter and suppresses its outflow. As a result, the SS removal rate of the supernatant water is improved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a sedimentation basin 1 has an inflow portion 2 formed on one side, an outflow portion 3 formed on the other side opposite thereto, and a partition wall having an opening at a lower portion between the inflow portion 2 and the outflow portion 3. A solid-liquid separation device 6 having an inclined plate 5 for facilitating sedimentation of suspended solids is provided at a position near the outlet 3 in the pond. Thus, a gravity settling portion A is formed on the upstream side of the partition wall 4, and an inclined plate settling portion B is formed on the downstream side.

The solid-liquid separation device 6 includes a plurality of the inclined plates 5 described above, and a hinge 7 for connecting the lower side of each inclined plate 5 and the side wall of the sedimentation basin 1 to provide each inclined plate 5 with the sedimentation basin. The upper side of each inclined plate 5 is connected to each other by a connecting member 8, and the connecting member 8 is connected to the arm 9 a of the driving device 9. In the state shown,
Each inclined plate 5 is inclined at an appropriate angle so that the upper side is located closer to the inflow portion 2. When the arm portion 9 a is moved back and forth, the upper side of each inclined plate 5 moves in the arrow direction, and each inclined plate 5 is moved. 5 swings around the horizontal axis.

A plurality of air diffusers 10 are provided below the inclined plate 5, and each air diffuser 10 is connected to an air supply means such as a blower 11. The operation of the above configuration will be described.

The water to be treated 12 flows into the sedimentation basin 1 from the inflow part 2, flows through the gravity sedimentation part A toward the partition wall 4, and then passes through the lower opening of the partition wall 4 to settle the inclined plate. And flows upward through the inclined plate sedimentation section B, and flows into the inclined plate 5.
And the supernatant water 13 flows out of the outflow portion 3. In the meantime, most of the suspended solids in the water to be treated 12 are gravity-sedimented in the gravity sedimentation part A, and the remaining suspended solids are efficiently gravity-sedimented in the inclined plate sedimentation part B. The sedimentation of the suspended matter is promoted and its outflow is suppressed. As a result, the SS content of the supernatant water 13 is low.

When suspended substances settle on the surface of the inclined plate 5, or at regular intervals, the arm 9a of the driving device 9
By moving the upper side of each inclined plate 5 in the direction of the arrow to swing each inclined plate 5, thereby changing the inclination angle of each inclined plate 5 and peeling off suspended substances settled on the surface thereof. I do. The swing of each inclined plate 5 may be once or plural times.

In the above-described method, when the suspended substance settled on the surface of the inclined plate 5 is difficult to separate, or simultaneously with the above-described method, the air is ejected from the blower 11 through the air diffuser 10 to ascend. The surface of the inclined plate 5 is washed by the bubble flow of air and the rising water flow generated thereby, and the suspended substance settled on the surface of the inclined plate 5 is peeled off.

By removing the suspended substance precipitated on the surface of the inclined plate 5 as described above, it is possible to suppress a decrease in the solid-liquid separation performance of the inclined plate. In addition, the upper side of each inclined plate 5 is the outflow portion 3
Even more inclined angles are sufficient to serve as the inclined plate 5 for promoting the settling of suspended matter. Therefore, by making each inclined plate 5 swingable, both surfaces of the inclined plate 5 can be utilized.

In the above configuration, each inclined plate 5 is supported on the side wall of the sedimentation basin 1 by the hinge 7.
Install a pole in the pond to support
Other structures are also possible in which the rocker can be swingably supported at a predetermined position in the pond. Further, even in a sedimentation tank structure having no partition wall, the same effect can be obtained by the above-described solid-liquid separation device.

[0021]

As described above, according to the present invention, since the inclined plate is configured to be swingable, the suspended substance settled on the plate surface can be easily peeled off by changing the angle of inclination. The plate surface that could not be used with the fixed type inclined plate can also be used effectively. In addition, by providing an air diffuser below the inclined plate, the suspended substance that has settled and adhered to the plate surface can be positively peeled off. As a result, a decrease in the solid-liquid separation performance of the inclined plate can be suppressed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a sedimentation tank provided with a solid-liquid separation device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sedimentation tank 5 Inclined plate 6 Solid-liquid separation device 7 Hinge 9 Drive device 9a Arm part 10 Air diffuser 12 Treated water 13 Clear water

Claims (3)

[Claims] 1. A solid-liquid separation device provided in a sedimentation pond for sedimentation and separation of suspended matter in inflowing treated water by gravity and for discharging supernatant water, wherein the solid matter is separated into the treated water in the pond in the flow direction. A plurality of inclined plates which are arranged at an appropriate angle to promote the sedimentation of suspended solids, and each of the inclined plates is connected to one side of each of the inclined plates so that each of the inclined plates is swingably supported at a predetermined position in the pond. A solid-liquid separation device, comprising: a support means for performing the rotation of each of the inclined plates; and a driving means for driving the swing of each of the inclined plates. 2. The solid-liquid separation device according to claim 1, wherein air diffusion means is provided below the inclined plate. 3. A sedimentation basin separated into an inflow side of treated water and an outflow side of supernatant water by a partition wall having an opening at a lower portion, wherein the sedimentation basin is provided near the supernatant water outflow portion. Item 3. The solid-liquid separation device according to any one of Items 2.