JPH06296806A - Precipitation apparatus employing transverse flow tilting plates - Google Patents

Abstract

PURPOSE:To remarkably improve precipitation separation efficiency, inhibit the precipitated substances from becoming suspension again, and prevent the formation of density flow even if the suspension is dense by installing a proper number of tilting plates horizontally and in parallel at distances in each space between neighboring and reversely tilting plates which tilt in the opposite direction to the formers. CONSTITUTION:In each space between neighboring and tilting plates K, reversely tilting plates K' which tilt in the opposite direction to the plates K are installed horizontally and in parallel while keeping gap F between each two plates. Consequently, the supernatant liquid C produced in the back sides of the reversely tilting plates K' moves upward and joins with the supernatant liquid C in the back sides of the tilting plates K and the resulting supernatant liquid moves upward while passing the gap F. On the other hand, the suspension particles S which precipitate on the surface side of the reversely tilting plates K' slip down on the reversely tilting plates K' and join with the suspension particles S which precipitate on the surface of the tilting plates K and slip down on the tilting plates K and the resulting particles fall downward through the gap F. As a result, the ascending course of the supernatant liquid and the slipping down route of the suspension particles do not cross and the supernatant liquid and the suspension particles are led to the water surface part and bottom part, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lateral flow inclined plate settling apparatus which is installed in a settling tank or settling tank to separate a suspension into supernatant water (clarified liquid) and suspended particles (sediment). Regarding improvement.

[0002]

2. Description of the Related Art Conventionally, a slant plate settling device or a slant pipe settling device is installed in a settling tank or settling tank for settling separation during water purification process of waterworks and sewers, industrial wastewater treatment, and manufacturing process of chemical industry. It is a well-known fact that the settling tank and the settling tank are downsized by increasing the settling separation capacity.

The inclined plate settling device has a lateral flow system and an upward flow system, and the inclined tube settling device has an upward flow system. The size of the settling tank or settling tank is determined by the amount of suspension to be treated and the settling area obtained from the average settling speed of suspended particles.
The settling area is the water surface area of the settling tank or settling tank, and in any settling device, the settling area required for settling of suspended particles is three-dimensionally incorporated into the settling tank or settling tank by the projected area of the inclined plate or inclined pipe. As a result, the water surface area can be reduced, and the sedimentation tank and sedimentation tank can be downsized.

The conventional lateral flow inclined plate settling device is also called a horizontal flow inclined plate settling device, and as shown in FIG. 6, inclined plates K tilted in one direction in a settling tank or settling tank W are arranged at regular intervals. Existing in the horizontal direction. 7 and 8
As shown in, when the vertical and horizontal lengths of one inclined plate K are A and B, and the inclination angle of the inclined plate K is α, the projected sedimentation area is A × B · cos α. If n sheets are installed in the horizontal direction, n
× A × B · cos α. The inclination angle is generally about 60 degrees as an angle at which suspended particles slide off. In FIG. 9, suspended particles S of the suspension flowing between the inclined plates K ₁ and K ₂ settle from the back side of the inclined plate K ₂ ,
It settles on the surface of the inclined plate K ₁ and slides down as indicated by the solid arrow. The supernatant C generated on the back side of the inclined plate K ₂ moves upward as indicated by the dotted arrow. The ascending path of the supernatant C and the sliding path of the suspended particles S do not intersect, and the supernatant S is guided to the water surface portion and the suspended particles to the bottom portion.

[0005]

By the way, the distance between the inclined plates K in the above-mentioned conventional lateral flow inclined plate settling apparatus is appropriate in view of the concentration of the suspension, the size of the suspended particles, and problems in installation work. Necessary intervals. Therefore, there is a limit to the projected settling area of the inclined plate K installed in a settling tank or settling tank having a certain width. Further, since the water is communicated from the water surface to the bottom of the settling tank or settling tank, resuspension cannot be suppressed, and when the suspension is thick, a density flow occurs.

In view of the above, the present invention has the same installation condition as that of a conventional lateral flow inclined plate settling device, and the inclined plate can be extremely increased so that the settling area can be extremely increased without disturbing the ascending path of supernatant water and the sliding path of suspended particles. The present invention intends to provide a lateral flow inclined plate sedimentation device capable of remarkably improving the sedimentation and separation ability by suppressing the resuspension and preventing the density flow even when the suspension is thick. .

[0007]

A lateral flow inclined plate settling apparatus according to the present invention for solving the above-mentioned problems has a set of inclined plates tilted in one direction in a settling tank or settling tank at regular intervals. In a lateral flow inclined plate settling device arranged in parallel in the lateral direction, in the up-down direction between adjacent inclined plates, a counter-direction inclined plate that is inclined in the other direction facing the inclined plate, and its upper and lower ends and the above-mentioned It is characterized in that a proper number of them are arranged horizontally and in parallel with each other with a gap provided between them and the inclined plate.

[0008]

According to the lateral flow inclined plate settling apparatus of the present invention constructed as described above, the supernatant water generated on the back side of the counter-direction inclined plate between the adjacent inclined plates moves upward and one of the inclined plates is inclined. It merges with the clear water on the back side of the plate and moves upward through a gap provided between the upper end of the counter-direction tilt plate and one tilt plate. Suspended particles settling on the surface of the counter-direction inclined plate slide down on the counter-direction inclined plate, settled on the surface of the other inclined plate and merged with the suspended particles sliding down on the inclined plate, and the counter-direction inclined plate It slides downward through a gap provided between the lower end of the plate and the other inclined plate. Therefore, the ascending path of the supernatant water and the sliding path of the suspended particles do not intersect, the supernatant water is guided to the water surface part, the suspended particles are guided to the bottom part, and the sedimentation area of the suspended particles is the same under the water surface. Compared with the lateral flow inclined plate sedimentation device, it is almost doubled and the sedimentation separation capacity is remarkably improved. Moreover, since the flow path of the suspension liquid between the adjacent inclined plates is divided into several stages in the vertical direction by the anti-directional inclined plate, resuspension is suppressed. Further, even if the suspension is thick, it is divided into several stages by the counter-direction inclined plate and flows in and is rectified, so that the generation of density flow is prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A lateral flow inclined plate settling apparatus of the present invention will be described with reference to the drawing. As shown in FIG. 1, inclined plates K inclined in one direction (leftward) in a settling tank or settling tank W are arranged at regular intervals. Existing in parallel with each other in the horizontal direction, and in the up-down direction between the adjacent inclined plates K, a counter-direction inclined plate K ′ that is inclined in the other direction (to the right) facing the inclined plate K is formed in the vertical direction. A gap F is provided between the end and the inclined plate K, and an appropriate number, five in the illustrated example, are arranged horizontally and in parallel.

In the lateral flow inclined plate settling apparatus thus constructed, the suspension flows horizontally between the inclined plates K as shown by an arrow Q in FIG. If the suspension flowing horizontally between the inclined plates K is the conventional lateral flow inclined plate sedimentation device shown in FIG. 6, the maximum height of the horizontal interval P between the inclined plates K ₁ and K ₂ is as shown in FIG. If the height is h, the settling height of suspended particles in the suspension between the inclined plates K ₁ and K ₂ is h, but in the lateral flow inclined plate settling apparatus of the present invention, between the inclined plates K. Since the counter-direction tilt plate K'is provided so as to face the tilt plate K, the horizontal distance between the counter-direction tilt plates K'is set as shown in FIG.
_If the horizontal spacing P of ₁ and K ₂ is the same, the settling height of suspended particles is 0 to h, and the average settling height is 1/2 h,
The settling distance is significantly shortened. Therefore, if the horizontal interval P of the counter-direction inclined plate K'is made smaller, the sinking distance becomes proportionally smaller.

However, suspended particles in the suspension flowing horizontally between the inclined plates K settle from the back side of each inclined plate K and each opposite direction inclined plate K ', and the supernatant liquid rises. As shown in FIG. 4, the supernatant water C'generated on the back side of the counter-direction inclined plate K'between the adjacent inclined plates K ₁ and K ₂ moves upward as indicated by the dotted arrow, and one (left) inclination The supernatant water C generated on the back side of the plate K ₂ also moves upward as indicated by the dotted arrow and merges near the upper end of the counter-directional tilt plate K ′, and one side (left side) with the upper end of the counter-direction tilt plate K ′. And moves upward through a gap F provided between the inclined plate K ₂ and the inclined plate K ₂ . Suspended particles S ′ that have settled on the surface of the counter sloping plate K ′ slide down on the counter sloping plate K ′ as indicated by the solid line arrow, and settle on the surface of the other (right) sloping plate K ₁ . Suspended particles S sliding down on the inclined plate K ₁ merge with each other near the lower end of the counter-directional inclined plate K ′, and the lower end of the counter-directional inclined plate K ′ and the other (right) inclined plate. through the gap F which is provided between the K ₁ slides down downward. Therefore, the clear water C,
The rising path of C ′ and the sliding path of the suspended particles S, S ′ do not intersect, the supernatant water is guided to the water surface part, the suspended particles are guided to the bottom part, and the settling area of the suspended particles is below the same water surface. , Conventional figure 6
As compared with the lateral flow inclined plate settling device shown in FIG.
Taking into account the gap F at the upper and lower ends, the gap F is increased almost twice, and the sedimentation separation capability is significantly improved. That is, when the counter-direction plate inclined plates K ′ having vertical and horizontal lengths A ′ and B shown in FIG. 2 are arranged in n rows between the inclined plates K inclined in one direction as shown in FIG. , Increase of projected sedimentation area is n × m × A ′ ×
B cos α. Therefore, as a whole, n × A × Bco
It becomes sα + n × m × A ′ × Bcosα. Moreover, since the flow path of the suspension liquid between the adjacent inclined plates K is divided into several stages in the vertical direction by the counter-direction inclined plate K ′, resuspension is suppressed. Further, even if the suspension is thick, it is divided into several stages by the counter-direction inclined plate K ', flows in, and is rectified, so that generation of a density flow is prevented.

FIG. 5 shows a specific structural example of the lateral countercurrent inclined plate settling apparatus of the present invention. W is a settling tank, and a large number of inclined plates K tilted in one direction (leftward) at an appropriate angle in the settling tank W are arranged in parallel in the lateral direction at regular intervals and supported by a cubic frame T. ing. In the up-down direction between the adjacent inclined plates K, the counter-direction inclined plates K'opposed to the inclined plates K and inclined in the other direction (rightward) at the same angle are horizontally and parallel at the same intervals as the three inclined plates K. Further, a cubic frame T is supported via a support rope R, and a gap F is provided between the upper and lower ends of the counter-direction inclined plate K ′ and the inclined plate K. An overflow wall O of supernatant water is provided downstream of the lateral flow inclined plate settling device configured as described above.

[0013]

As described above in detail, the lateral flow inclined plate settling apparatus of the present invention is provided with a vertical direction between inclined plates which are inclined in one direction and arranged in parallel in a plurality of lateral directions, and an opposite direction which is inclined in the other direction. Since the inclined plates are horizontally and parallelly arranged with a gap between the upper and lower ends, the rising path of the supernatant water and the sliding path of the suspended particles do not change, and the supernatant water flows to the water surface and the suspended particles. Is led to the bottom, and the settling area of suspended particles is almost doubled under the same water surface as compared with the conventional lateral flow inclined plate settling device, and the settling separation ability is remarkably improved. Moreover, since the flow path of the suspension liquid between the adjacent inclined plates is divided into several stages in the vertical direction by the anti-directional inclined plate, resuspension is suppressed. Further, even if the suspension is thick, it is divided into several stages by the counter-direction inclined plate and flows in and is rectified, so that the generation of density flow is prevented.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a lateral flow inclined plate sedimentation device of the present invention.

FIG. 2 is a schematic perspective view showing a part of a lateral flow inclined plate sedimentation device of the present invention.

FIG. 3 is a diagram showing sedimentation heights of suspended particles between inclined plates and between counter-inclined plates in the lateral flow inclined plate sedimentation device of the present invention.

FIG. 4 is a diagram showing an ascending path of supernatant water and a sliding path of suspended particles in the lateral flow inclined plate sedimentation device of the present invention.

FIG. 5 is a perspective view showing a specific structural example of the lateral counterflow inclined plate sedimentation device of the present invention.

FIG. 6 is a conceptual diagram of a conventional lateral flow inclined plate sedimentation device.

FIG. 7 is a front view of an inclined plate in a conventional lateral flow inclined plate sedimentation device.

FIG. 8 is a side view of the inclined plate of FIG.

FIG. 9 is a diagram showing a rising path of supernatant water and a sliding path of suspended particles in a conventional lateral counterflow inclined plate sedimentation apparatus.

FIG. 10 is a diagram showing the settling height of suspended particles between inclined plates in a conventional lateral flow inclined plate settling device.

[Explanation of symbols]

 W Settling tank or settling tank K Inclination plate tilted in one direction K'Inverse direction inclination plate F Gap

Claims (1)

[Claims] 1. A lateral flow inclined plate settling apparatus in which inclined plates inclined in one direction are arranged in parallel in the lateral direction at regular intervals in a settling tank or settling tank, and adjacent adjoining inclined plates. In the vertical direction between them, an opposite direction inclined plate facing the inclined plate and inclined in the other direction is arranged horizontally and in parallel with an appropriate number with a gap between the upper and lower ends and the inclined plate. And a transverse flow inclined plate sedimentation device.