JP2024036662A - Solid-liquid separation equipment - Google Patents

Abstract

[Problem] To provide a solid-liquid separation facility that provides a new effect never before seen [Solution] This solid-liquid separation facility allows solids contained in received liquid to settle to the bottom, and includes a trough 4 provided at the bottom, a pond bottom surface 3 provided on both sides of the trough 4 in the width direction, inclined downward as it approaches the trough 4 and connected to the groove forming member at the bottom, a hollow space forming member 71 that extends along the length of the trough 4 and has an opening 71a at the bottom, a support member 72 that supports the space forming member 71 from above so that the vertical position and the widthwise position of the space forming member 71 can be freely adjusted, and a discharge port 73a that discharges fluid into an internal space IS defined by the inner peripheral surface of the space forming member 71. [Selected Figure] Figure 6

Description

The present invention relates to solid-liquid separation equipment in which solids contained in received liquid settle to the bottom.

For example, a sewage treatment plant receives wastewater such as sewage and rainwater, and after settling the sand contained in the wastewater into a groove formed by a groove forming member placed at the bottom of the pond, In some cases, solid-liquid separation equipment such as a settling basin is installed to collect sand deposited in a sand collection pit and remove it from the wastewater. This settling basin is equipped with a screw conveyor placed in the groove as a transfer mechanism for transferring the sand accumulated in the groove to the sand collection pit, and a drive device to drive the screw conveyor. exist. As a sand settling basin equipped with this screw conveyor and a drive device, for example, the one described in Patent Document 1 is known. Hereinafter, the transfer mechanism described in Patent Document 1 will be referred to as a screw conveyor type transfer mechanism. In addition, in recent years, sand settling ponds have been developed that are equipped with a transfer mechanism that includes a transfer space forming member with an opening at the lower end and a discharge port that discharges fluid into the transfer space formed by the transfer space forming member. , has been developed as described in Patent Document 2. Hereinafter, the transfer mechanism of the type described in Patent Document 2 will be referred to as an ejector type transfer mechanism. The opening of the transfer space forming member in this ejector-type transfer mechanism is provided in the groove in which the sand settles, and the sand accumulated in the groove is sucked into the transfer space by the flow of fluid discharged from the discharge port. Functions as a mouth. The sand sucked into the transfer space is moved toward the sand collection pit located downstream in the transfer direction by the flow of the fluid.

Sand settling basins equipped with a screw conveyor-type transfer mechanism drive the screw conveyor to collect sand in the sand collection pit, so the screw conveyor drive device may wear out and need to be replaced. Further, there is a possibility that dirt or the like gets caught in the drive force transmission device which is disposed between the drive device and the screw conveyor and transmits the drive force to the screw conveyor, causing trouble. Furthermore, since the driving force transmission device is placed in dirty water, there is a possibility that it will be damaged due to corrosion. As a result, the screw conveyor type transfer mechanism has a problem of high maintenance and management costs. On the other hand, in a sand settling basin equipped with an ejector-type transfer mechanism, there are fewer troubles and maintenance costs are lower because there is no driving device or driving force transmission device.

In addition to settling basins, solid-liquid separation equipment, which separates liquid and solid by settling solids (such as metal powder) contained in the received liquid to the bottom, is also used in sewage treatment plants. ing.

Japanese Patent Application Publication No. 2002-282607 JP 2015-361 Publication

In recent years, there has been a demand for solid-liquid separation equipment that provides unprecedented new effects.

In view of the above circumstances, it is an object of the present invention to provide a solid-liquid separation facility that exhibits new and unprecedented effects.

The solid-liquid separation equipment of the present invention that solves the above objects is as follows:
A solid-liquid separation facility in which solids contained in the received liquid settle to the bottom,
a groove forming member provided on the bottom;
a pond bottom surface provided on both sides in the width direction of the groove forming member, sloping downward as it approaches the groove forming member and connected to the groove forming member at the lowest part;
a hollow space forming member extending along the longitudinal direction of the groove forming member and having an opening at the bottom;
a support member that supports the space-forming member from above so as to adjust the vertical position and the width-direction position of the space-forming member;
A discharge port for discharging fluid into the internal space defined by the inner circumferential surface of the space forming member is characterized.

In this solid-liquid separation equipment,
The space forming member is disposed in the groove formed by the groove forming member, and has an arc-shaped cross section, and the center of a circle including the arc as part of the circumference is located within the groove. The groove-forming member may be located below the boundary between the upper portion of the groove-forming member and the lower portion of the groove-forming member.

According to the present invention, it is possible to provide a solid-liquid separation facility that exhibits new effects never seen before.

FIG. 2 is a plan view of a sand settling basin equipped with a screw conveyor type transfer mechanism. FIG. 2 is a sectional view taken along line AA of the sand settling basin shown in FIG. 1. FIG. (a) is a BB sectional view of the sand settling basin shown in FIG. 2. Moreover, (b) is a CC sectional view of the sand settling basin shown in FIG. FIG. 2 is a plan view of a settling basin equipped with an ejector-type transfer mechanism. FIG. 5 is a sectional view taken along line EE of the sand settling basin shown in FIG. 4. (a) is a DD cross-sectional view of the sand settling basin shown in FIG. 5. Further, (b) is a sectional view taken along line EE of the sand settling basin shown in FIG. FIG. 6 is a cross-sectional view taken along line FF of the sand settling basin shown in FIG. 5. It is a figure which shows some examples which covered at least one part of the inner peripheral surface 4a of the trough 4 with a protective material. It is a flowchart showing the flow of renovation.

Embodiments of the present invention will be described below with reference to the drawings. A settling basin, which is an embodiment of the present invention, is a solid-liquid separation equipment installed in a sewage treatment plant, and after settling sand contained in wastewater such as sewage and rainwater, the settled sand is collected. It is removed from the wastewater by moving it to a pit.

First, the sand settling basin equipped with a screw conveyor type transfer mechanism before renovation will be explained. FIG. 1 is a plan view of a sand settling basin equipped with a screw conveyor type transfer mechanism.

A settling basin 1 shown in FIG. 1 and equipped with a screw conveyor type transfer mechanism receives wastewater such as sewage and rainwater from the right side in FIG. The received sewage flows slowly toward the left side of the diagram in the settling basin 1, settling the sand contained in the sewage (see the straight arrow shown in FIG. 1). Hereinafter, the upstream side of the flow of received wastewater will be simply referred to as the upstream side, and the downstream side of the flow of the received wastewater will be simply referred to as the downstream side. Note that a dust remover (not shown) is installed at the upstream end of the settling basin 1 to remove contaminants (scum) larger than a predetermined size that are mixed in the wastewater that has flowed into the settling basin. There is. Furthermore, a gate (not shown) is also provided at the upstream end of the settling basin 1 for selecting whether to accept or block wastewater into the settling basin 1. On the downstream side of the sand settling tank 1, a pump well (not shown) is arranged to store wastewater from which sand has been removed by the sand settling tank 1. A lift pump is installed inside the pump well, and the sewage sucked by the pump is sent to a settling tank where the next stage of sewage treatment is performed.

As shown in FIG. 1, the sand settling basin 1 is a substantially rectangular pond in plan view, including a sand collection pit 2, a basin bottom surface 3, a trough 4, and a screw conveyor type transfer mechanism 5. Two beams 9 are provided at the upper part of the settling basin 1, extending across the width direction of the settling basin so as to partially block the settling basin 1. The sand collection pit 2 is provided at the downstream portion of the bottom of the sand settling basin 1. The sand collection pit 2 is provided with a sand pump (not shown) that carries out the sand in the sand collection pit 2 to the outside of the pond. The pond bottom surface 3 is a surface formed on the left and right sides in the pond width direction on the upstream side of the sand collection pit 2, and is composed of a concrete surface cast at the bottom of the sand settling basin 1. The trough 4 is provided on the upstream side of the sand collection pit 2 and at the center in the width direction of the sand settling basin 1 at the bottom of the basin. The trough 4 of this embodiment corresponds to an example of a groove forming member. The pond bottom surface 3 slopes downward as it approaches the trough 4 from both sides in the pond width direction, and is connected to the trough 4 at the lowest point. The trough 4 forms a groove 41 that is open upward. The longitudinal direction of this trough 4, that is, the longitudinal direction of the groove 41, coincides with the longitudinal direction of the sand settling basin 1. The length of the trough 4 in the longitudinal direction in this embodiment is 5 m. The downstream end of the trough 4 is connected to the sand collection pit 2. Most of the sand in the wastewater that has flowed into the sand settling basin 1 settles toward the sand collecting pit 2, the basin bottom 3, or the trough 4. The sand that has settled toward the pond bottom surface 3 slides down the sloped pond bottom surface 3 and is deposited in the groove 41.

A liner 42 is installed in the longitudinally central portion of the groove 41 and on the inner circumferential surface 4a of the trough 4. The liner 42 includes a liner base 421 and a liner trough 422. The liner base 421 is made of a high tensile strength steel plate with a thickness of 6 mm. Further, the liner trough 422 is formed of a high tensile strength steel plate with a plate thickness of 12 mm. Note that each or one of the liner base 421 and the liner trough 422 may be formed of other materials such as resin with high wear resistance. Liner trough 422 is fixed to liner base 421. The liner base 421 is provided with eight elongated holes 421a that are elongated in the vertical direction. The liner 42 is detachably attached to the pond bottom surface 3 by passing through the elongated hole 421a and screwing a bolt (not shown) into the pond bottom surface 3. Note that by providing the elongated hole 421a that is elongated in the vertical direction, the mounting position of the liner 42 in the vertical direction can be freely adjusted. The liner trough 422 is worn out when the screw conveyor 51, which will be described in detail later, is bent and comes into contact with the liner trough 422. When the amount of wear on the liner trough 422 exceeds a certain amount, the liner 42 can be replaced with a new one by removing the bolts mentioned above.

FIG. 2 is a sectional view taken along line AA of the sand settling basin shown in FIG. Note that, in FIG. 2, hatching showing the cross section of the trough is omitted. Further, in FIG. 2, the flow direction of wastewater is shown by a straight arrow.

As shown in FIG. 2, the screw conveyor type transfer mechanism 5 includes a screw conveyor 51, a drive device 52, a driving force transmission device 53, a first coupling 54, and a second coupling 55. The drive device 52 includes a motor 521 and a reducer 522 arranged on the upstream beam 9, and a drive shaft 523 extending from the reducer 522 toward the pond bottom. By driving the motor 521, the drive shaft 523 rotates via the reduction gear 522. The drive shaft 523 is connected to the drive force transmission device 53 by a first coupling 54 .

The driving force transmission device 53 is disposed at the bottom of the pond in a transmission device installation space V1 connected to one end of the groove 41 in the longitudinal direction. The transmission device installation space V1 is a rectangular parallelepiped space provided upstream of the pond bottom surface 3 and the trough 4. The driving force transmission device 53 is a device that has a function of converting the driving direction and a deceleration function. The driving force transmission device 53 converts a rotational movement centered on a shaft extending in the vertical direction into a rotational movement centered around an axis extending in the longitudinal direction of the groove 41, while reducing the rotational speed. A part of the sand contained in the waste water settles in the transmission device installation space V1. Since the driving force transmitting device 53 may be buried by this settled sand, the driving force transmitting device 53 is provided with a sand prevention function.

The driving force transmission device 53 is connected to one end of the screw conveyor 51 by a second coupling 55. Therefore, when the motor 521 is driven, the screw conveyor 51 rotates via the driving force transmission device 53 and the like. The screw conveyor 51 is a hollow shaft arranged in the groove 41 and having helical blades around its periphery. Note that the screw conveyor 51 may be configured with a solid shaft having spiral blades around the periphery. The axial direction of the screw conveyor 51 coincides with the longitudinal direction of the groove 41. The other end of the screw conveyor 51 protrudes slightly into the sand collection pit 2. The other end is supported by a bearing 511 placed at a predetermined position. The bearing 511 is spanned between the left and right side walls of the sand settling basin 1 and supported by a support shaft 512 fixed to the side walls with bolts (not shown). As the screw conveyor 51 rotates, the blades around the screw conveyor 51 push the sand accumulated in the grooves 41 toward the sand collection pit 2. Thereby, the sand accumulated in the groove 41 is transferred to the sand collection pit 2. That is, the direction from the right side to the left side in FIG. 2 is the sand transport direction.

FIG. 3(a) is a BB cross-sectional view of the sand settling basin shown in FIG. Moreover, FIG. 3(b) is a CC sectional view of the sand settling basin shown in FIG. In these figures, the direction from the back of the figure to the front is the sand transport direction. Note that hatching showing the cross section of the trough is omitted in FIGS. 3(a) and 3(b).

As shown in FIG. 3(a), the trough 4 is composed of a concrete flume with a U-shaped cross section. The trough 4 has a lower part formed in a 1/2 arc with an inner diameter of 338 mm, and an upper part formed in a straight line extending 2 degrees outward in the groove width direction. Further, the trough 4 is fixed to concrete cast at the bottom of the pond by three anchor bolts 411. The screw conveyor 51 has only a portion of its blades protruding above the groove 41, but the rest of the blades are arranged within the groove 41. The outer diameter of the blades of the screw conveyor 51 is 320 mm. That is, the outer diameter of the screw conveyor 51 is slightly smaller than the inner diameter of the arc of the lower portion of the trough 4. Therefore, a gap is formed between the blades of the screw conveyor 51 and the trough 4. Further, the axial center of the screw conveyor 51 is located 13 mm above the center of a circle that includes the arc of the lower portion of the trough 4 as part of its circumference.

As described above, the liner 42 is installed in the longitudinally central portion of the groove 41 and on the inner circumferential surface 4a of the trough 4. As shown in FIG. 3(b), the liner base 421 that constitutes the liner 42 covers the inner peripheral surface 4a of the trough 4, extends above the trough 4, and also covers the lower end portion of the pond bottom surface 3. . The longitudinal center portion of the groove 41 in which the liner 42 is disposed, from the upper end of the trough 4 to the vicinity of the upper end of the liner base 421, is compared with the portion other than the longitudinal center portion of the groove 41 shown in FIG. 3(a). The pond bottom surface 3 protrudes a little in the center. At this protruding portion, the liner base 421 is detachably fixed to the pond bottom surface 3 by bolts (not shown). The liner trough 422 is attached to the inner peripheral surface of the lower end of the liner base 421. The screw conveyor 51 may bend downward due to its own weight or reaction force when transferring sand. When the deflection increases, the blades in the axially central portion of the screw conveyor 51 come into contact with the liner trough 422, and further deflection is suppressed. When the screw conveyor 51 rotates in this contact state, the liner trough 422 will wear out. When the liner trough 422 wears out a predetermined amount, maintenance can be easily performed by removing the bolts mentioned above and replacing the liner 42.

Next, the sand settling basin equipped with an ejector-type transfer mechanism after renovation will be explained. The sand collection pit 2, basin bottom 3, trough 4, and beam 9 are those of the sand settling basin 1 equipped with the screw conveyor type transfer mechanism 5 before the above-mentioned renovation, and will be used as they are after the renovation. The reference numerals used will be used and the explanation will be omitted.

FIG. 4 is a plan view of a sand settling basin equipped with an ejector-type transfer mechanism. In FIG. 4, the beams at the top of the settling basin are omitted to show the structure of the bottom of the settling basin. Further, FIG. 5 is a sectional view taken along line EE of the sand settling basin shown in FIG. In FIG. 5, hatching showing the cross section of the trough is omitted. In FIGS. 4 and 5, the direction from the right side to the left side of the figure is the sand transport direction. Further, in FIGS. 4 and 5, the flow direction of wastewater is shown by a straight arrow.

As shown in FIG. 4, the renovated sand settling basin 10 includes an ejector type transfer mechanism 7 in place of the screw conveyor type transfer mechanism 5 of the sand settling basin 1 shown in FIGS. 1 to 3. The ejector type transfer mechanism 7 includes a space forming member 71, a support member 72, a nozzle 73, and a nozzle pipe 74. The space forming member 71 is a hollow elongated member with an opening provided at its lower part, and extends along the longitudinal direction of the groove 41 . The length of the space forming member 71 in the extending direction is 5.05 m, and one end on the upstream side coincides with one end of the trough 4. Therefore, the other end of the space forming member 71 is formed 0.05 m longer on the downstream side than the other end of the trough 4, and the space forming member 71 protrudes into the sand collection pit 2 by that length. The space forming member 71 has a sub space forming part 712 and a main space forming part 711 provided at one end thereof. The cross-sectional shape of the sub-space forming part 712 is the same as that of the main space-forming part 711. The sub-space forming part 712 has a significantly shorter length in the extending direction than the main space-forming part 711. The sub-space forming part 712 and the main space-forming part 711 are removably fastened together by a fastening member 713 consisting of a bolt and a nut. Four supporting members 72 are provided at equal intervals in the extending direction of the space forming member 71. The main space forming portion 711 is supported by the support member 72 so as to be placed at a predetermined position within the groove 41 . The support member 72 is not provided in the sub-space forming part 712, and is supported by the main space forming part 711 at a position continuous to the main space forming part 711. The inner circumferential surface 711a (see FIG. 6A) of the main space forming part 711 and the inner circumferential surface 712a (see FIG. 7) of the sub-space forming part 712 are continuous in the extending direction of the space forming member 71. The tip portion of the nozzle 73 is disposed within the internal space IS defined by the sub-space forming portion 712 (see FIG. 7). Since the sub-space forming part 712 is detachably fastened to the main space-forming part 711, for example, when the nozzle 73 becomes clogged, the sub-space forming part 712 can be removed from the main space forming part 711 and the nozzle can be removed. By exposing 73, maintenance can be easily performed. The space forming member 71 and the support member 72 will be explained in more detail later.

The nozzle 73 is formed by crushing a round pipe into a flat shape from the top and bottom, and has a discharge port 73a formed at its tip that is long in the pond width direction and short in the top and bottom directions. Both ends of the space forming member 71 in the extending direction are open. The tip portion of the nozzle 73 is inserted into the internal space IS (see FIG. 7) from one open end thereof. The discharge port 73a is arranged in the internal space IS, and discharges fluid toward the extending direction of the space forming member 71 when transferring sand. The fluid discharged from the discharge port 73a is sewage stored in the sand settling basin 10, which is pumped up by a pump (not shown). However, water from other ponds, taps, etc. may be used as the fluid to be discharged from the discharge port 73a. Also, this fluid may be a mixture of liquid and gas, but if the proportion of gas is too high, the flow of the discharged liquid tends to weaken, so even if a mixture is used, the proportion of gas is Less is better. In this embodiment, the discharge pressure of the waste water discharged from the discharge port 73a is 0.09 MPa, and the amount of water injected is 1500 liters per minute. However, the discharge pressure may be 0.05 MPa or more and 0.3 MPa or less, and the amount of water jetted may be adjusted as appropriate depending on the length of the space forming member 71. Moreover, the discharge flow rate of water is preferably 8 m/sec or more.

The nozzle pipe 74 is connected to the nozzle 73. This nozzle piping 74 is for supplying the above-mentioned fluid to the nozzle 73. As shown in FIG. 5, a flow rate adjustment valve 741 and an electric valve 742 are installed at the upstream portion of the nozzle piping 74 in the supply direction. In addition, in FIG. 5, the nozzle piping 74 located upstream of the flow rate adjustment valve 741 in the supply direction is not shown. A portion of the nozzle 73 and the downstream end portion of the nozzle piping 74 in the supply direction are arranged in the transmission device installation space V1 (see FIG. 2) where the driving force transmission device 53 was installed before the modification. Hereinafter, in the transmission device installation space V1, a space in which a part of the nozzle 73 and the downstream end portion of the nozzle piping 74 in the supply direction are arranged will be referred to as a piping installation space V3. The piping installation space V3 has a rectangular parallelepiped shape smaller than the transmission device installation space V1. Further, the pipe installation space V3 is connected to one end of the groove 41 in the longitudinal direction. As shown in FIG. 4, in a portion of the space that was the transmission device installation space V1 except for the piping installation space V3, an inclined surface 8 that extends downward as it approaches the piping installation space V3 is formed. It can be said that the inclined surface 8 is inclined downward as it approaches the groove 41. This inclined surface 8 is composed of an upstream inclined surface 81 and left and right inclined surfaces 82. The upstream inclined surface 81 is formed on the opposite side of the groove 41 with respect to the piping installation space V3, and continues to the upstream side of the piping installation space V3. The left and right inclined surfaces 82 are continuous with both ends of the pipe installation space V3 in the pond width direction. However, the left and right inclined surfaces 82 may not be formed, and only the upstream inclined surface 81 may be formed as the inclined surface 8. When only the upstream slope 81 is formed, it is desirable that a portion of the upstream slope 81 outside the pipe installation space V3 in the pond width direction extends to the pond bottom surface 3. The inclined surface 8 is composed of a surface of poured concrete. In FIG. 5, the cross-section of the poured concrete is shown by cross hatching. By forming the slope 8, sand that has settled on the slope 8 can be slid down toward the pipe installation space V3. The angle of inclination of the upstream inclined surface 81 and the angle of inclination of the left and right inclined surfaces 82 are the same. Further, although the slope angle of the slope surface 8 in this embodiment is gentler than the slope angle of the pond bottom surface 3 (see FIG. 7), these slope angles may all be made to match. The sand that slid down the slope 8 and accumulated below the piping installation space V3 was sucked into the internal space IS (see FIG. 7) when the fluid was discharged from the discharge port 73a, and was discharged into the internal space IS. The wastewater is transported toward the sand collection pit 2 by the flow of wastewater. If the driving force transmission device 53 is removed and the transmission device installation space V1 is left as is, the sand accumulated at both ends in the pond width direction of the transmission device installation space V1 and the upstream end of the transmission device installation space V1 will be discharged. Since it is located far from the outlet 73a, even if fluid is discharged from the outlet 73a, it is not sucked into the internal space IS and remains. By forming the inclined surfaces 8, it is possible to prevent sand from remaining at the ends thereof.

FIG. 6(a) is a cross-sectional view taken along line DD of the sand settling basin shown in FIG. Further, FIG. 6(b) is a sectional view taken along line EE of the sand settling basin shown in FIG. Further, FIG. 7 is a cross-sectional view taken along line FF of the sand settling basin shown in FIG. In these figures, the direction from the back of the figure to the front is the sand transport direction. In FIG. 7, the slope is shown by a two-dot chain line, and the hatching showing the cross section of the concrete etc. forming the settling basin is omitted. Note that hatching showing the cross section of the trough is omitted in FIGS. 6(a), 6(b), and 7.

As shown in FIG. 6(a), the space forming member 71 has a 5/6 circular cross-sectional shape with an opening 71a at the lower end. That is, the cross-sectional shape of the space forming member 71 is in the shape of an arc that is a part of a circle with the center 71c as the center point. This space forming member 71 is formed from a stainless steel plate with a thickness of 3 mm into an arc shape with an inner diameter of 150 mm. The width of the opening 71a is 80 mm. This opening 71a is provided over the entire length of the space forming member 71. Further, the opening 71a is arranged to face the lower end portion of the inner circumferential surface 4a of the trough 4, and functions as a suction port for sucking in sand accumulated in the groove 41. The space forming member 71 partitions the inside of the groove 41. The internal space IS formed by the space forming member 71 becomes a transfer space for transferring sand. Since the space forming member 71 has an arcuate cross section with a closed upper portion, the sand that has settled in the settling basin 10 toward the upper portion of the space forming member 71 is absorbed into the upper portion of the space forming member 71. easy to slide over the outer surface of the The sand that has slipped is deposited below the groove 41. Further, the internal space IS below the center 71c of the space forming member 71 becomes narrower in the pond width direction toward the lower opening 71a. This makes it difficult for the sand sucked into the internal space IS to leak out from the internal space IS. As described above, the inner diameter of the arc of the lower part of the trough 4 is 338 mm, so the inner diameter of the lower part of the trough 4 is more than twice the inner diameter of the space forming member 71.

Supported parts 715 are fixed to the space forming member 71 at four locations at equal intervals in the extending direction of the space forming member 71. The supported portion 715 is welded to the outer peripheral surface 71b of the space forming member 71. The supported portion 715 is used in combination with a support member 72, which will be described later. FIG. 6A shows one of the sets of the supported portion 715 and the support member 72. Since the other three supported parts 715 and the supporting members 72 have the same configuration, the explanation of the other three supporting members 72 will be omitted. The supported portion 715 is supported by the support member 72. The support member 72 has a support plate 721 and two support screw shafts 722. The support plate 721 is made of a stainless steel plate with an L-shaped cross section. The center part 721a in the groove width direction in the lower part of the support plate 721 has a horizontal plate surface, and the plate surface in both end parts 721b in the groove width direction in the lower part of the support plate 721 has the same inclination angle as the pond bottom surface 3. It is sloping. The support member 72 is fixed to the pond bottom surface 3 by bolts (not shown) passing through holes (not shown) provided in both end portions 721b in the groove width direction. Two long holes (not shown) that are long in the groove width direction are formed in the groove width direction central portion 721a, and the support screw shaft 722 passes through the long holes. The support screw shaft 722 is a shaft having a thread formed on the outer circumferential portion of the shaft. Two nuts 723 screwed to this support screw shaft 722 sandwich the groove width direction central portion 721a from above and below. Thereby, the support screw shaft 722 is fixed to the support plate 721 such that the vertical position and the groove width direction position can be freely adjusted. Further, the support screw shaft 722 also passes through a hole (not shown) formed in the upper end portion of the supported portion 715 . Two nuts 724 other than the nut 723 are screwed to the support screw shaft 722, and these nuts 724 sandwich the upper end portion of the supported portion 715 from above and below. As a result, the supported portion 715 is held by the support screw shaft 722 so that its position in the vertical direction can be freely adjusted. The space forming member 71 is fixed to the sand settling basin 1 by the supported portion 715 and the supporting member 72 so that the position in the vertical direction and the groove width direction can be freely adjusted. Note that the support screw shaft 722 may be fixed to one of the supported portion 715 and the support member 72 by welding or the like. Moreover, when it is not necessary to adjust the position of the space forming member 71 in the vertical direction and the groove width direction, the supported portion 715 and the supporting member 72 may be formed integrally. However, by making the position where the space forming member 71 is freely adjustable in the vertical direction and the groove width direction, the position of the space forming member 71 in the height direction and the groove width direction when installing the space forming member 71. This is preferable because it can be set arbitrarily at the construction site. Note that only one of the vertical position and the groove width direction position of the space forming member 71 may be made adjustable. Conversely, it may be configured to be adjustable not only in the vertical position and the groove width direction but also in the extending direction of the space forming member 71.

As described above, the cross-sectional shape of the trough 4 is such that the upper part is formed in a straight line and the lower part is formed in an arc shape. Further, as described above, the cross-sectional shape of the space forming member 71 is an arc shape having the opening 71a at the lower end portion. In the present embodiment, the center 71c of a circle that includes the arc as part of the circumference is located below the boundary line 41b between the linear portion of the trough 4 and the arc-shaped portion of the trough 4. There is. With this arrangement, the shortest distance between the outer circumferential surface 71b of the space forming member 71 and the inner circumferential surface 4a of the trough 4 is the opening along the outer circumferential surface 71b of the space forming member 71 from the upper end of the space forming member 71. It becomes shorter as it approaches 71a. When sewage is discharged from the discharge port 73a (see FIG. 5) into the internal space IS formed by the space forming member 71, a flow of sewage is generated within the internal space IS. A pressure difference is generated between the internal space IS and the outside of the space forming member 71 due to the fluid flow. That is, negative pressure is generated in the internal space IS where fluid flow is occurring. The sand accumulated in the groove 41 is sucked into the internal space IS through the opening 71a by the negative pressure. At this time, the shortest distance between the outer circumferential surface 71b of the space forming member 71 and the inner circumferential surface 4a of the trough 4 becomes shorter as it approaches the opening 71a. The flow becomes faster. Thereby, sand can be easily sucked in through the opening 71a, and sand can be prevented from remaining in the groove 41. Further, when the trough 4 has a U-shaped cross section, a large amount of sand can be deposited in the groove 41 compared to the case where the trough 4 has a circular arc cross section. The sand sucked into the internal space IS is transported towards the sand collection pit 2 by the flow of waste water occurring within the internal space IS.

As shown in FIG. 7, the center of the discharge port 73a and the center 71c of the space forming member 71 are aligned. Furthermore, the direction in which the waste water is discharged from the center of the discharge port 73a and the direction in which the space forming member 71 extends coincide with each other. Due to these, the wastewater discharged from the discharge port 73a is difficult to diffuse in the radial direction perpendicular to the discharge direction. Further, the space forming member 71 prevents the wastewater discharged from the discharge port 73a from spreading in directions other than the lower opening 71a, so that the flow of the wastewater is maintained within the internal space IS over a long distance.

As shown in FIG. 6(b), in the sand settling basin 10 after the renovation, the liner 42 that was there before the renovation has been removed, so the inner peripheral surface 4a of the trough 4 is exposed in the longitudinal center portion of the groove 41. ing. In addition, in the part where the liner 42 was attached before the repair, a protruding part 3a that protrudes toward the center in the pond width direction is formed at the lower end part of the pond bottom surface 3. In this embodiment, this protruding portion 3a is left as is, but it may be removed by cutting it off when removing the liner 42.

Further, at least a portion of the inner circumferential surface 4a of the trough 4 may be covered with a protective material.

FIG. 8 is a diagram showing some examples in which at least a portion of the inner circumferential surface 4a of the trough 4 is covered with a protective material.

FIG. 8(a-1) is a cross-sectional view of the trough bottom taken along the longitudinal direction of the trough 4, and FIG. 8(a-2) is a sectional view of the trough whose bottom is shown in FIG. 8(a-1). 4 is a cross-sectional view taken in a direction intersecting the longitudinal direction.

In this example, the liner 42 has been removed and no new arc-shaped groove forming member or concrete has been placed, but a protective material 61 is provided on the inner peripheral surface 4a of the trough 4. There is. This protective material 61 is a protective layer made of resin that is applied to cover the entire inner circumferential surface 4a of the trough 4. Therefore, the protective material 61 is provided above the upper end of the space forming member 71. Note that the protective material 61 may be provided higher than the trough 4. Moreover, the protective material 61 is provided along the inner circumferential surface 4a of the trough 4, and has the same shape as the inner circumferential surface 4a. It is conceivable that the inner circumferential surface 4a of the trough 4 will be worn out by the sand transferred by the ejector-type transfer mechanism 7, but by providing this protective material 61, the inner circumferential surface 4a of the trough 4 itself will not be worn out. You can prevent this from happening. When the protective material 61, which is a protective layer made of resin, is worn out, the protective layer can be applied again. Repainting the protective layer is cheaper than replacing the trough 4, and providing the protective material 61 reduces maintenance costs.

FIG. 8(b-1) is also a cross-sectional view of the trough bottom taken along the longitudinal direction of the trough 4, and FIG. 8(b-2) is a sectional view of the trough whose bottom is shown in FIG. 8(b-1). 4 is a cross-sectional view taken in a direction intersecting the longitudinal direction.

In the examples shown in FIGS. 8(b-1) and 8(b-2), the liner 42 has not been removed, nor has the arc-shaped groove forming member been newly installed or concrete placed. The protective member 62 in this example is a high-tensile steel plate made of the same material as the liner trough 422, and is installed so as to be replaceable, for example, by bolting or the like.

As shown in FIG. 8(b-2), in the portion where the liner 42 remains, a protective material 62 is provided so as to surround the liner trough 422, and the protective material 62 covers a part of the liner base 421. The thickness of the protective material 62 shown in FIG. 8(b-2) is the same as the thickness of the liner trough 422. Therefore, there is no difference in level from the liner trough 422, and sand can be prevented from remaining.

On the other hand, in the portion where the liner 42 is not provided, the protective material 62 is provided on the inner circumferential surface 4a of the trough 4, as shown in FIG. 8(b-1), and The thickness of the protective material 62 is the sum of the thickness of the liner base 421 and the thickness of the liner trough 422. Therefore, there is no difference in level from the liner 42.

Although the protective material 62 in this example is provided only to a point lower than the upper end of the space forming member 71, it is still possible to prevent the inner circumferential surface 4a of the trough 4 from being worn out due to the transfer of sand. . When the protective material 62 made of steel plate is worn out, it is sufficient to replace the protective material 62, and the cost of replacing the protective material 62 is cheaper than replacing the trough 4. Maintenance costs are kept low even if

Note that the protective material 62 may be a stainless steel plate or the like instead of the high-tensile steel plate. Further, the protective material 62 may be provided only in a portion below the space forming member 71, or may be provided only in a portion of the space forming member 71 facing the opening 71a.

FIG. 8(c-1) is also a cross-sectional view of the trough bottom taken along the longitudinal direction of the trough 4, and FIG. 8(c-2) is a sectional view of the trough whose bottom is shown in FIG. 8(c-1). 4 is a cross-sectional view taken in a direction intersecting the longitudinal direction.

In the examples shown in FIGS. 8(c-1) and 8(c-2), the liner 42 has not been removed, nor has a new arc-shaped groove forming member been installed or concrete placed. The protective material 63 in this example is a woven or nonwoven fabric impregnated with a curable resin, or a lining material to which a resin plate is bonded.

As shown in FIG. 8(c-2), in the portion where the liner 42 remains, a protective material 63 is provided from above the liner trough 422, and the liner trough 422 is covered with the protective material 63. The portion of the protective material 63 that covers the edge of the liner trough 422 is gently sloped and does not have a sharp difference in level, which can prevent sand from remaining.

On the other hand, in the portion where the liner 42 is not provided, the protective material 62 is provided on the inner circumferential surface 4a of the trough 4, as shown in FIG. 8(c-1). Furthermore, as shown in FIG. 8(c-1), the portion of the protective material 63 that covers the area around the edge of the liner 42 is also gently sloped and does not have any sharp steps, which prevents sand from remaining. I can do it.

Although the protective material 63 in this example is provided only up to the same height as the upper end of the space forming member 71, it can prevent the inner peripheral surface 4a of the trough 4 from being worn out due to sand transfer. When the protective material 63 that is the lining material wears out, it is only necessary to reline the protective material 63, and the cost of lining the protective material 63 is cheaper than replacing the trough 4. Even if 62 is installed, the maintenance and management costs are kept low.

FIG. 9 is a flowchart showing the flow of modification.

FIG. 2 shows an example of the flow of upgrading the sand settling basin 1 equipped with the screw conveyor type transfer mechanism 5 shown in FIGS. 1 to 3 to the sand settling basin 10 equipped with the ejector type transfer mechanism 7 shown in FIGS. 4 to 7. , will be explained with reference to FIGS. 5, 9, etc. During the renovation, the screw conveyor type transfer mechanism 5 shown in FIG. The sand basin 1 is emptied by sucking up the water with a pump (not shown) (pre-renovation work). Then, the second coupling 55 is loosened, the bearing 511 and the support shaft 512 are removed, and the screw conveyor 51 disposed in the groove 41 is pulled out and removed from the second coupling 55 (step S1). Next, the first coupling 54 is loosened, the motor 521 and reducer 522 placed on the upstream beam 9 are removed, and the drive shaft 523 is pulled out from the first coupling 54 (step S2). Then, the driving force transmission device 53 is lifted to the ground together with the first coupling 54 and the second coupling 55 and removed (step S3). Thereafter, the liner trough 422 installed in the longitudinal center portion of the groove 41 is removed together with the liner base 421 (step S4). With the above steps, the removal work of the screw conveyor type transfer mechanism 5 is completed. After the removal work, in the portion where the liner trough 422 and liner base 421 were installed, the cross-sectional area of the groove 41 is expanded by the thickness of the liner trough 422 and liner base 421. The cross-sectional area of the groove 41 at the upstream end and the downstream end, other than where the liner trough 422 and the liner base 421 were installed, is the same as before the modification. That is, the cross-sectional area of the groove 41 after the screw conveyor 51 is removed is kept larger than the cross-sectional area before the screw conveyor 51 is removed. The space forming member 71, nozzle 73, etc. are installed while maintaining these cross-sectional areas.

Next, the ejector type transfer mechanism 7 shown in FIG. 5 is installed. In this installation work, first, concrete is poured in a portion of the transmission device installation space V1 (see FIG. 2) other than the piping installation space V3 to form an upstream slope 81 and left and right slopes 82 (step S5). Thereafter, a nozzle piping 74 is installed from the ground to the piping installation space V3 along the side wall of the settling basin 10 and one of the left and right inclined surfaces 82, and a nozzle 73 having a discharge port 73a is installed at the end of the piping on the piping installation space V3 side. (Step S6). Finally, the space forming member 71 is placed in the groove 41 from which the screw conveyor 51 has been removed, and the supporting member 72 is fixed to the pond bottom surface 3. Then, the space forming member 71 is fixed to the supporting member 72 while adjusting the height position of the space forming member 71 using the supporting screw shaft 722 as necessary (step S7). These steps S6 and S7 correspond to an example of a transfer mechanism installation process. Through steps S6 and S7, the discharge port 73a is arranged within the internal space IS.

In this renovation, not only the pond bottom surface 3 is used as is, but also an ejector type The sand settling basin 10 has been modified to include a transfer mechanism 7. That is, except for removing the liner 42 shown in FIG. 2 from the groove 41, the trough 4 is used as it is in the ejector type transfer mechanism 7. Therefore, the sand settling basin 10 equipped with the ejector-type transfer mechanism 7 can be retrofitted at low cost. Note that the liner 42 may be left without being removed. However, if the liner 42 remains, a step will be formed in the middle of the longitudinal direction of the groove 41, so the sand will be dammed up by the step and cannot be sucked into the internal space IS, and the sand will remain at the step. There is a risk of it getting lost. For this reason, it is desirable to remove the liner 42.

Further, the driving force transmission device 53 may be left in the transmission device installation space V1 without being removed. However, especially sand that has accumulated on the upstream side of the driving force transmitting device 53 is blocked by the driving force transmitting device 53 and difficult to be transferred, and may stay there for a long time, so the driving force transmitting device 53 is removed. It is preferable. Further, the drive device 52 may also be left in place without being removed. In addition, when leaving it, it is necessary to change the shape of the part of the nozzle piping 74 on the ground from that shown in FIG. 5 etc. so as to avoid the drive device 52. In addition, the bearing 511 and the support shaft 512 may also be left without being removed, but the bearing 511 in particular is located at a position that blocks a part of the downstream end of the space forming member 71 in the transfer direction, and is not removed inside the internal space IS. It is desirable to remove the wastewater as it may obstruct the flow of wastewater.

Further, although the flowchart showing the flow of the repair shown in FIG. 9 does not include the step of protecting the inner circumferential surface of the groove, before fixing the space forming member 71 (step S7), the protection described using FIG. A step of providing materials 61 to 63 may also be performed. That is, a groove inner circumferential surface protection step may be performed in which at least a portion of the inner circumferential surface 4a of the trough 4 from which the screw conveyor 51 has been removed is covered with protective materials 61 to 63. This groove inner circumferential surface protection step may be performed after step S2 and before step S7, and the timing of implementation is not limited. For example, it may be performed before step S6 is performed. Further, the groove inner circumferential surface protection step may be carried out without carrying out step S4 of removing the liner 42. Even if the groove inner peripheral surface protection process is carried out, there is no need to install new arc-shaped groove forming members or pour concrete, so ejector type transfer from solid-liquid separation equipment equipped with a screw conveyor type transfer mechanism is possible. Modification to solid-liquid separation equipment equipped with a mechanism can be carried out at low cost. Furthermore, the inner circumferential surface 4a of the trough 4 covered with the protective materials 61 to 63 shown in FIG. 8 is protected from wear due to movement of sand.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. For example, although the trough 4 is made of a concrete flume, it may be formed by pouring concrete without using a concrete flume. In this case, the surface portion of the concrete corresponds to the groove forming member. Moreover, the driving force transmission device 53 may have only the function of converting the driving direction. Further, although an example has been shown in which the discharge port 73a is disposed within the internal space IS, the discharge port 73a may be located outside the internal space IS as long as it is at a position where sewage is discharged into the internal space IS. Alternatively, the discharge port 73a may be arranged at a position that coincides with a surface formed by one end of the space forming member 71 in the extending direction, that is, on a boundary surface of the end of the internal space IS in the extending direction. In this embodiment, the screw conveyor 51 is removed, the driving force transmission device 53 is removed, the drive device 52 is removed, and the liner 42 is removed after that, but the order of removal may be different. Some or all of the screw conveyor 51, drive force transmission device 53, drive device 52, and liner 42 may be removed at the same time. Further, the driving force transmission device 53, the driving device 52, and the liner 42 may be removed after the space forming member 71 is installed. In addition, the drive device 52 and the liner 42 may be removed after the nozzle piping 74 and the nozzle 73 are installed or the inclined surface 8 is formed. Further, in this embodiment, the nozzle pipe 74 and the nozzle 73 are installed after the inclined surface 8 is created, and then the space forming member 71 is placed, but the order of these may be different. However, if the nozzle piping 74 and the nozzle 73 are installed first when forming the slope 8, they may get in the way when forming the slope 8. It is desirable to install nozzle piping 74 and nozzle 73. Moreover, the space forming member 71, the nozzle piping 74, and the nozzle 73 may be combined and integrated before installation, and then installed. In addition, although the space forming member 71 of this embodiment has an arcuate cross section, it may have a U-shaped cross section with an open bottom, for example. Although the trough 4 of this embodiment has a U-shaped cross section, it may also have a V-shaped cross-sectional shape, a U-shaped cross-sectional shape with an open upper part, or a cross-sectional shape consisting only of circular arcs (for example, /2 arc shape, less than 1/2 arc shape, or more than 1/2 arc shape).

Although the explanation has been given above using a settling tank installed in a sewage treatment plant as an example, the present invention can also be applied to a settling tank installed in a sewage treatment plant. Furthermore, solid-liquid separation equipment that separates liquid and solid by settling solids (for example, metal powder, etc.) contained in received liquid at the bottom is used in places other than sewage treatment plants, and the present invention It can also be widely applied to general solid-liquid separation equipment.

The solid-liquid separation equipment explained so far is
A solid-liquid separation facility in which solids contained in the received liquid settle to the bottom,
a groove forming member provided on the bottom and having an arcuate inner peripheral surface;
a hollow space forming member extending along the longitudinal direction of the groove forming member and having an opening at the bottom;
a discharge port for discharging fluid into an internal space defined by an inner circumferential surface of the space forming member;
The opening is arranged opposite to the arcuate inner circumferential surface of the groove forming member,
The space forming member is configured such that the shortest distance between the outer circumferential surface of the space forming member and the inner circumferential surface of the groove forming member becomes shorter as the distance from the upper end of the space forming member approaches the opening along the outer circumferential surface. Furthermore, the groove forming member may be arranged in a groove formed by the groove forming member.

This solid-liquid separation equipment includes at least a solid-liquid separation equipment repaired by the first or second solid-liquid separation equipment repair method of the present invention.

According to this solid-liquid separation equipment, since the flow of solids toward the opening side becomes faster at the lower end portion of the groove, it becomes easier to suck the solids through the opening, and it is possible to suppress solids from remaining in the groove. . Therefore, the solid-liquid separation equipment of the present invention is a solid-liquid separation equipment that provides unprecedented new effects.

Note that the groove forming member may have an arc-shaped cross-section or a substantially U-shaped cross-section. However, when the groove forming member has a substantially U-shaped cross section, a larger amount of solid can be deposited in the groove than when the groove forming member has an arcuate cross section.

Further, in this solid-liquid separation equipment, the groove forming member has an upper portion of the inner circumferential surface formed in a straight line shape and a lower portion of the inner circumferential surface formed in an arc shape,
The space forming member has a cross-sectional shape of an arc,
A center of a circle including the arc as part of its circumference may be located below a boundary between the upper portion and the lower portion of the groove forming member.

By doing so, the shortest distance between the space forming member and the groove forming member can be made shorter as the distance from the upper end of the space forming member approaches the opening along the outer peripheral surface of the space forming member.

By the way, in recent years, it has become desirable to upgrade solid-liquid separation equipment equipped with a screw conveyor-type transfer mechanism to solid-liquid separation equipment equipped with an ejector-type transfer mechanism at a cost as low as possible.

The first method of repairing the solid-liquid separation equipment explained so far is as follows:
A method for repairing solid-liquid separation equipment having a groove forming member at the bottom that forms a groove open upward, the method comprising:
a screw conveyor removal step of removing the screw conveyor placed in the groove;
In the groove from which the screw conveyor has been removed, a hollow elongated space-forming member having an opening at the bottom and a discharge port for discharging fluid into the internal space defined by the inner circumferential surface of the space-forming member. and a transfer mechanism installation step for installing the
In the transfer mechanism installation step, the space forming member and the discharge port are installed while maintaining the cross-sectional area of the groove from which the screw conveyor was removed to be greater than or equal to the cross-sectional area of the groove before the screw conveyor was removed. It is characterized in that it is a process of installing.

According to this first method for repairing solid-liquid separation equipment, the solids accumulated in the groove can be removed from the space without adding an arc-shaped groove forming member, concrete, etc. to the groove where the screw conveyor was placed. Since the solid-liquid separation equipment is renovated to one that transfers using a transfer mechanism that includes a forming member and the discharge port, the solid-liquid separation equipment that is equipped with a screw conveyor-type transfer mechanism is changed to a solid-liquid separation equipment that is equipped with an ejector-type transfer mechanism. can be renovated at low cost.

The second solid-liquid separation equipment repair method explained so far is as follows:
A method for repairing solid-liquid separation equipment having a groove forming member at the bottom that forms a groove open upward, the method comprising:
a screw conveyor removal step of removing the screw conveyor placed in the groove;
a groove inner circumferential surface protection step of covering at least a portion of the inner circumferential surface of the groove from which the screw conveyor has been removed with a protective material;
In the groove from which the screw conveyor has been removed, a hollow elongated space-forming member having an opening at the bottom and a discharge port for discharging fluid into the internal space defined by the inner circumferential surface of the space-forming member. and a step of installing a transfer mechanism.

The protective material may be made of a material different from that of the groove forming member. Moreover, it is preferable that the protective material is replaceable or reapplyable. Alternatively, the protective material may have a shape that follows the inner peripheral surface of the groove. Furthermore, the protective material may have the same thickness as the liner described below.

According to this second method for repairing solid-liquid separation equipment, it is sufficient to cover at least a part of the inner circumferential surface of the groove in which the screw conveyor was disposed with the protective material, and the groove has an arcuate groove. No additional forming members, concrete, etc. are required. Therefore, also by this second solid-liquid separation equipment modification method, it is possible to inexpensively modify a solid-liquid separation equipment equipped with a screw conveyor-type transfer mechanism to a solid-liquid separation equipment equipped with an ejector-type transfer mechanism. Furthermore, the inner circumferential surface of the groove covered with the protective material is protected from wear due to movement of solids.

In addition, in the first and second solid-liquid separation equipment repair methods, "placed in the groove" and "installed in the groove..." refer to the parts that were placed or the parts that were installed. This concept includes the case where a part of the member protrudes outside the groove.

Further, in the first and second solid-liquid separation equipment repair methods, a driving force transmission device for transmitting driving force to the screw conveyor, which is disposed in a transmission device installation space connected to one longitudinal end of the groove. It may also include a transmission device removal step of removing the transmission device.

If the driving force transmitting device is left in place, the driving force transmitting device acts as a barrier to the movement of solids, and the solids accumulated around the driving force transmitting device cannot move to the groove and remain in the same position for a long period of time. There is a risk that it will remain in the By including the step of removing the driving force transmission device, it is possible to prevent solids accumulated around the position where the driving force transmission device was placed from staying at the same position for a long period of time.

Furthermore, the first and second methods for repairing solid-liquid separation equipment may include a step of forming an inclined surface in the transmission device installation space, which slopes downward toward the groove.

The inclined surface allows solids that have settled in the transmission device installation space to slide down toward the groove, so that the slid solids can be transferred by the ejector-type transfer mechanism. Note that even if solids deposited near the discharge port are deposited upstream of the discharge port in the transport direction, they are drawn into the internal space by discharging fluid from the discharge port, so the ejector It can be transported by a type transport mechanism.

In the first and second solid-liquid separation equipment repair methods, the transfer mechanism installation step may be performed such that the shortest distance between the outer circumferential surface of the space-forming member and the inner circumferential surface of the groove-forming member is the space-forming member. The space forming member may be installed at a position that becomes shorter as it approaches the opening along the outer peripheral surface from the upper end of the member.

The groove may be formed to have a wide groove width in order to match the size of the screw conveyor. By installing the space forming member at a position where the shortest distance becomes shorter as it approaches the opening, the flow of solids toward the opening side at the lower end of the groove becomes faster than near the upper end of the space forming member. Even if the groove width is wide, solids can be easily sucked through the opening. This can prevent solids from remaining in the grooves without being sucked in through the openings.

Further, in the first and second methods for repairing solid-liquid separation equipment, the screw conveyor, which is disposed in the longitudinal center portion of the groove and on the inner circumferential surface of the groove forming member, contacts and wears out. It may include a liner removal step of removing the removable liner.

If the liner remains, the liner will create a step in the middle of the groove in the longitudinal direction, and there is a risk that solids will be dammed up by the step and remain in the step portion. By removing the liner, it is possible to prevent solids from remaining in the stepped portion.

In addition, in the second method for repairing solid-liquid separation equipment, without providing the liner removal step and leaving the liner in place, a region of the inner circumferential surface of the groove where the liner does not exist is replaced with the liner. It may be covered with the protective material having the same thickness as the pressure. By doing so, no step is caused by the liner, and solids can be prevented from remaining.

The solid-liquid separation equipment explained so far is
A solid-liquid separation facility in which solids contained in the received liquid settle to the bottom,
a groove forming member provided on the bottom and having an arcuate inner peripheral surface;
a hollow space forming member extending along the longitudinal direction of the groove forming member and having an opening at the bottom;
a discharge port for discharging fluid into an internal space defined by an inner circumferential surface of the space forming member;
The opening is arranged opposite to the arcuate inner circumferential surface of the groove forming member,
The space forming member is configured such that the shortest distance between the outer circumferential surface of the space forming member and the inner circumferential surface of the groove forming member becomes shorter as the distance from the upper end of the space forming member approaches the opening along the outer circumferential surface. , disposed within the groove formed by the groove forming member,
having a piping installation space connected to one longitudinal end of the groove formed by the groove forming member and in which a piping for supplying fluid to the discharge port is disposed;
It is characterized in that it includes an inclined surface facing downward as it approaches the piping installation space on the opposite side of the groove with respect to the piping installation space.

Since the solids that have settled on the slope can be slid down toward the piping installation space, by discharging the fluid from the discharge port, the solids that have accumulated in the piping installation space are sucked into the internal space and transferred. be able to.

According to these, there is provided a method for repairing solid-liquid separation equipment that requires low repair costs, and a solid-liquid separation equipment that includes at least solid-liquid separation equipment repaired using the repair method and that produces new effects never seen before. can do.

In addition, the solid-liquid separation equipment explained so far is
A solid-liquid separation facility in which solids contained in the received liquid settle to the bottom,
a groove forming member provided on the bottom;
a hollow space forming member extending along the longitudinal direction of the groove forming member and having an opening at the bottom;
a discharge port for discharging fluid into an internal space defined by an inner circumferential surface of the space forming member;
The groove forming member has an upper portion of the inner circumferential surface of the groove forming member formed in a linear shape, and a lower portion of the inner circumferential surface of the groove forming member having a circular arc shape of 1/2 arc. can be,
The opening is arranged opposite to the arcuate inner circumferential surface of the groove forming member,
The space forming member is such that the shortest distance between the outer circumferential surface of the space forming member and the inner circumferential surface of the groove forming member approaches the opening from the upper end of the space forming member along the outer circumferential surface of the space forming member. The groove-forming member is arranged in the groove formed by the groove-forming member and has an arc-shaped cross section, and the center of a circle including the arc as part of the circumference is located within the groove formed by the groove-forming member. It is characterized in that it is located below a boundary between the upper part and the lower part of the forming member.

In this solid-liquid separation equipment,
The groove forming member may be formed in a straight line with the upper portion expanding outward in the groove width direction.

The solid-liquid separation equipment explained so far is
A solid-liquid separation facility in which solids contained in the received liquid settle to the bottom,
a groove forming member provided on the bottom;
a pond bottom surface provided on both sides in the width direction of the groove forming member, sloping downward as it approaches the groove forming member and connected to the groove forming member at the lowest part;
a hollow space forming member extending along the longitudinal direction of the groove forming member and having an opening at the bottom;
a support member that spans the pond bottom surface, has both end portions fixed to the pond bottom surface, and supports the space forming member from above;
and a discharge port for discharging fluid into the internal space defined by the inner circumferential surface of the space forming member,
The groove forming member has an upper portion of the inner circumferential surface of the groove forming member formed in a linear shape, and a lower portion of the inner circumferential surface of the groove forming member having a circular arc shape of 1/2 arc. can be,
The opening is arranged to face an arcuate inner circumferential surface of the groove forming member,
The space forming member is such that the shortest distance between the outer circumferential surface of the space forming member and the inner circumferential surface of the groove forming member approaches the opening from the upper end of the space forming member along the outer circumferential surface of the space forming member. The groove-forming member is arranged in the groove formed by the groove-forming member so that the cross-sectional shape is an arc, and the center of a circle including the arc as part of the circumference is the groove. It is characterized in that it is located below a boundary between the upper part and the lower part of the forming member.

In this solid-liquid separation equipment,
The space forming member may be supported by the support member so that its vertical position can be adjusted.

1, 10 Sediment basin 4 Trough 61, 62, 63 Protective material 8 Inclined surface 41 Groove 42 Liner 51 Screw conveyor 53 Drive force transmission device 71 Space forming member 71a Opening 73a Discharge port IS Internal space

Claims (2)

A solid-liquid separation facility in which solids contained in the received liquid settle to the bottom,
a groove forming member provided on the bottom;
a pond bottom surface provided on both sides in the width direction of the groove forming member, sloping downward as it approaches the groove forming member and connected to the groove forming member at the lowest part;
a hollow space forming member extending along the longitudinal direction of the groove forming member and having an opening at the bottom;
a support member that supports the space-forming member from above so as to adjust the vertical position and the width-direction position of the space-forming member;
A solid-liquid separation facility comprising: a discharge port that discharges a fluid into an internal space defined by an inner circumferential surface of the space forming member. The space forming member is disposed in the groove formed by the groove forming member, and has an arc-shaped cross section, and the center of a circle including the arc as part of the circumference is located within the groove. The solid-liquid separation equipment according to claim 1, wherein the solid-liquid separation equipment is located below a boundary between an upper portion of the groove forming member and a lower portion of the groove forming member.

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