JP2586151Y2 - Washing mechanism for solid-capture carrier in solid-liquid separation tank - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-liquid separation device for a wastewater treatment device, and to a washing mechanism for a carrier capturing solid matter.

[0002]

2. Description of the Related Art In a relatively large solid-liquid separation apparatus, a solid substance capturing carrier is washed as follows.

[0003] The water level of the solid-liquid separation tank is lowered by several centimeters, air is blown out from the vicinity of the bottom of the solid-liquid separation tank, the carrier is caused to flow, and the solid matter adhered to the carrier is separated and washed.

[0004] Next, an internal solution containing a large amount of suspended substances separated from the carrier is removed outside the apparatus.

In a relatively small solid-liquid separation device, since the control device and the structure cannot be complicated, the operation of washing the carrier is performed by excluding the internal liquid from the outside of the device. At this time, due to the collision between the carriers and the friction of the drainage liquid, the solid matter adhering to the carrier is not sufficient but is peeled off and removed.

[0006]

The method of cleaning a relatively large solid-liquid separator can be expected to have a sufficient cleaning effect even with a conventional method. However, there is a problem that the operation is complicated and an additional device such as an air pump is required.

A method for cleaning a relatively small solid-liquid separator is as follows.
Operation and mechanism are simple. However, there is a case where a sufficient cleaning effect cannot be expected because there is not much movement between the carriers.

An object of the present invention is to solve the conventional problems and to provide a washing mechanism for a solid trapping carrier in a solid-liquid separation tank, which can obtain a sufficient washing effect by a simple mechanism and operation.

[0009]

According to the present invention, in a carrier washing step, a projection having a structure for inhibiting carrier movement is provided at a position where the carrier moves up and down inside the solid-liquid separation tank.

The shape of the projection is not limited, such as a bar or a plate, but it is desirable that the projection is easy to process and mount.

The arrangement of the projections may be three-dimensionally uniform over the entire vertical position of the carrier, may be constant in the vertical direction, or may be provided only near the wall surface.

Further, regarding the arrangement of the projections, there are cases where the bar-shaped projections are staggered in parallel, when the bar-shaped projections are crossed, and when the plate-shaped projections are provided stepwise on the wall surface. . The protrusions are oriented in a lateral direction or an oblique direction.

[0013] Further, the projection may have a rotatable structure around a certain point as an axis.

[0014] Further, a perforated plate is provided near the bottom of the solid-liquid separator layer so that the carrier does not fall below a certain position.

The carrier preferably has a specific gravity slightly smaller than that of water, a large surface area, and is not easily damaged by friction.

[0016]

In the solid-liquid separation device, the solid substance capturing carrier is washed by removing the liquid inside the solid-liquid separation device outside the tank. The carrier descends with the elimination of the internal liquid (water to be treated). At this time, the lowering of the carrier is hindered by the projection provided inside the solid-liquid separation tank, and the positional relationship between the carriers is changed. This change in the positional relationship between the carriers destroys the accumulation portion of the adhered solid matter inside and outside the carrier, hinders recapture of the solid matter, and provides an efficient cleaning effect.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described.

FIG. 1 shows a state where the solid-liquid separation device is normally operated.

The solid-liquid separation device 1 has an inlet 2, an outlet 3 and a drain 5 for the water to be treated, and has a portion 4 filled with a carrier for capturing solids therein. Since the specific gravity of the carrier 8 is lower than that of water, this portion exists at a constant thickness near the water surface.
Further, a projection 6 protrudes from the inner wall surface at the center of the solid-liquid separation tank 1, and a mesh plate 7 smaller than the size of the carrier 4 is provided at a lower portion.
The outlet 3 is provided with a carrier outflow prevention net.

The carrier 8 may be a carrier usually used for capturing microorganisms and solids. FIG. 16 shows a carrier used in this example. The carrier used was a plastic on a small cylinder having a specific gravity of 1.0 or less and a diameter of 10 to 30 mm. The plastic is preferably made of a material such as polyethylene or polypropylene.

The water to be treated flows into the solid-liquid separation tank 1 via the inlet 2. The inflowing treated water passes through the solid-liquid separation tank 1 in an upward flow, from which solids are removed, and flows out from the outlet 3. At this time, the solid matter is removed best when passing through the filling part 4 of the carrier 8 provided in the solid-liquid separation tank 1. As the processing progresses, the removed solids accumulate inside and outside the carrier 8. In addition, the valve of the drain port 5 is closed.

FIG. 2 shows a step of washing the carrier 8.

The inflow of the water to be treated is stopped, and the internal liquid (water to be treated) is discharged from a drain port 5 provided in the solid-liquid separation tank 1. With the discharge of the internal liquid, the water surface in the tank and the position of the carrier filling section 4 decrease. When the lower end of the carrier filling section 4 reaches the position of the projection 6 provided inside the solid-liquid separation tank 1, the carrier 8 and the projection 6 collide, and the position and orientation of the carriers 8 are changed. Can be changed, and the detachment of trapped solids is promoted. This effect continues until the carrier filling portion 4 is below the lower end of the protrusion 6. Thus, the internal liquid containing a large amount of the solid matter removed from the carrier 8 as a suspended substance is discharged. The interval between the protrusions 6 was set to be twice or more and ten times or less the size of the carrier.

FIG. 3 shows the situation when the washing process of the carrier 8 is nearing the end.

The carrier filling section 4 whose position has been lowered along with the water surface is held above the lowest water surface by a perforated plate 7 provided near the bottom of the solid-liquid separation tank 1. Since the water surface comes to a position lower than the carrier filling part 4, the solid matter adhering to the carrier filling part 4 is removed together with the drainage and hardly remains.

The operation is returned to the normal operation in the reverse process of the above operation.

FIG. 4, FIG. 5, and FIG. 6 show an embodiment in which the projections are mounted on the entire solid-liquid separation layer in the vertical direction.

FIG. 4 shows an embodiment in which the projections 26 are arranged uniformly over the entire vertical position of the carrier filling section 24.

FIG. 5 shows an embodiment in which the projections 26 are arranged at regular intervals over the entire vertical position of the carrier filling section 24.

FIG. 6 shows that the protrusions 2 are formed over the entire vertical position of the carrier filling portion 24 near the wall surface of the solid-liquid separation layer.
This is an example in which No. 6 is arranged.

FIGS. 7, 8, 9 and 10 show embodiments in which the shapes and the arrangement directions of the projections are different.

FIG. 7 shows an embodiment in which the bar-like projections 36 are alternately arranged in parallel. The upper surface of the carrier filling section 34 is indicated by a dotted line.

FIG. 8 shows an embodiment in which rod-like projections 36 are arranged to cross each other.

FIG. 9 shows an embodiment in which short protrusions 36 on a short bar are arranged at different levels on the wall surface.

FIG. 10 shows an embodiment in which the projections 36 on the plate are arranged stepwise on the wall surface.

FIGS. 11 to 14 show an embodiment in which the protrusion has a movable structure.

FIG. 11 shows a state in which the movable filling member 46 is used and the carrier filling portion 44 is raised. The movable projection 46 can rotate about an axis 48. As the carrier rises, the projection 46 receives the pressing force of the carrier and changes its posture so as to minimize the resistance.

FIG. 12 is a plan view corresponding to FIG. 11, showing a state where the carrier filling section 44 is raised when the movable projection 46 is used.

FIG. 13 shows a state in which the carrier filling section 44 is lowered during the cleaning step. The posture of the protrusion 46 is
It changes so that the resistance to the descending carrier increases. This increases the solid portion peeling effect. But,
The posture does not change beyond a certain position by the stopper 47 provided at the set position.

FIG. 14 is a plan view corresponding to FIG. 13, showing a situation where the carrier filling section 44 is lowered during the cleaning step.

FIG. 15 shows an embodiment in which a sludge pump 59 is incorporated in a solid-liquid separation tank. The installation area of the entire apparatus is small, and the equipment is compact.

The features of this embodiment will be described with reference to FIG.

A partition plate 58 is provided inside the solid-liquid separation layer,
One of the partitioned interiors is a path 55 for flowing the water to be treated flowing from the inlet 52 to the solid-liquid separation processing portion, and the other partitioned interior is the same as the solid-liquid separation layer of the above embodiment. Has functions. In other words, the to-be-processed water inlet of the above embodiment is provided below the solid-liquid separation layer, but in the present embodiment, the to-be-processed water inlet is provided above the solid-liquid separation layer.

The feature of this embodiment is that the sludge pump 59 is installed at the lowermost part of the flowing water passage 55 to enable such a configuration.

The solid-liquid separation portion has a carrier filling portion 54 made of the carrier 8, and is provided with a projection 56, a plate 57, and a treated water outlet 53.
All aspects of the solid-liquid separation layer described in the above can be adopted.

In the treatment step of this embodiment, the water to be treated flows in through the inlet 52, rises as an upward flow from the lower part of the solid-liquid separation tank through the inflow path 55, and passes through the carrier filling section 54. The solids of the water to be treated adhere to the carrier 8, and the solids are separated from the water to be treated. The water from which the solids have been separated flows out through the outlet 53.

Next, in the cleaning step, the sludge pump 59 is operated, and the sludge water in the solid-liquid separation tank is drained from the pipe 60 passing through the drain path 55. The function of the solid material peeling off the carrier 8 by the projections 56 is the same as in the above embodiment.

Each embodiment shows a case where an appropriate mechanism is selected according to the amount and quality of the solid matter in the wastewater, the amount of wastewater, the amount and shape of the carrier, and the like.

[0049]

[Effects of the Invention] Since the present invention is configured as described above, the following effects can be obtained.

Since the positional relationship between the carriers changes, the captured solids between the carriers are broken.

Further, since the posture of the carrier itself changes, the captured solids inside the carrier fall off.

Further, since the internal liquid is discharged while changing the posture of the carrier itself, it is difficult for the solids once removed to be recaptured.

As described above, a sufficient washing effect can be obtained with a simple mechanism and operation, so that the solid-liquid separation device can be improved in performance, reduced in size, and reduced in cost.

[Brief description of the drawings]

FIG. 1 is a schematic vertical sectional view of a solid-liquid separation tank according to an embodiment of the present invention during a normal wastewater treatment operation.

FIG. 2 is a schematic vertical sectional view of a solid-liquid separation tank according to an embodiment of the present invention during a carrier washing step.

FIG. 3 is a schematic vertical sectional view of a solid-liquid separation tank according to an embodiment of the present invention immediately before the end of the carrier washing step.

FIG. 4 is a schematic vertical cross-sectional view of a solid-liquid separation tank of an embodiment in which protrusions are evenly arranged over the entire position where the carrier moves up and down.

FIG. 5 is a schematic vertical cross-sectional view of a solid-liquid separation tank of an embodiment in which protrusions are arranged at regular intervals over the entire position where the carrier moves up and down.

FIG. 6 is a view showing a state in which a protrusion is located near a wall surface of a solid-liquid separation device,
It is a longitudinal section schematic diagram of a solid-liquid separation tank of an example arranged in the whole position where a carrier moves up and down.

FIG. 7 is a partially cutaway perspective view of a solid-liquid separation tank of an embodiment in which rod-shaped projections are alternately arranged in parallel.

FIG. 8 is a partially cutaway perspective view of a solid-liquid separation tank of an embodiment in which rod-shaped protrusions are arranged to cross at right angles.

FIG. 9 is a partially cutaway perspective view of a solid-liquid separation tank of an embodiment in which short rod-shaped protrusions are arranged on a wall surface.

FIG. 10 is a partially cutaway perspective view of a solid-liquid separation tank of an embodiment in which protrusions on a plate are arranged stepwise on a wall surface.

FIG. 11 is a schematic vertical sectional view of a solid-liquid separation tank of an embodiment showing a state where a carrier is raised when a movable projection is used.

FIG. 12 is a plan view of the solid-liquid separation tank of FIG.

FIG. 13 is a schematic vertical sectional view of a solid-liquid separation tank of an embodiment showing a state of a carrier descending during a washing step when a movable projection is used.

FIG. 14 is a plan view of the solid-liquid separation tank of FIG.

FIG. 15 is a schematic vertical sectional view of a solid-liquid separation tank of an embodiment in which a sludge pump is incorporated in the solid-liquid separation tank.

FIG. 16 is a perspective view of a carrier used in an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solid-liquid separation tank 2, 52 Inflow port 3, 53 Outflow port 4, 24, 44, 54 Carrier filling part 5 Washing water outlet 6, 26, 36, 46, 56 Projection 7, 57 Plate 8 Carrier 9 Carrier Outflow prevention net 34 Carrier upper limit position 47 Stopper 48 Movable projection rotating shaft 55 Treated water inflow path 58 Partition plate 59 Sludge pump 60 Piping

Continued on the front page (51) Int.Cl. ⁶ Identification code FI B01D 29/38 520A

Claims (1)

(57) [Scope of request for utility model registration] 1. A solid-liquid separation tank in which a carrier having a specific gravity slightly smaller than that of water is packed so as to be capable of changing its positional relationship with each other and performs a solid-liquid separation process in an upward flow. A solid substance capturing carrier washing mechanism for a solid-liquid separation tank, wherein a projection is provided at a position where the solid substance capturing carrier moves up and down during washing.