JP2000117014A - Solid-liquid separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid-liquid separator capable of separating a fine granular solid component and a liquid with small required driving power and not generating vibration and noises without making the whole device large. SOLUTION: This solid-liquid separator is provided with a belt transportation device 1 having a water-permeable endless transportation belt 4, a feeder 2 for discharging a solid-liquid mixture on the transportation belt 4 and a water absorbing device 3 containing at least one pair of water absorbing rollers 10, 11 consisting of upper and lower rollers arranged in the further front of the movement direction of the transportation belt 4 than the feeder 2 and formed so as to sandwich the transportation belt 4 vertically.

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, and more particularly, to a device for separating waste water generated at a civil engineering work site into a solid content and a liquid content.

[0002]

2. Description of the Related Art Wastewater generated at a civil engineering work site or the like contains solids having various particle diameters such as sand and gravel. There is a problem in terms of cost.

Conventionally, as a device for solid-liquid separation of this kind of wastewater, a vibrating sieve and a pressure filtration device are known. As shown in FIG. 4, the motorized vibrating sieve is provided with a steel net 102 at a lower portion of an airframe 101, and the steel net 102 is attached to the motor 1
Vibration is caused by the action of the eccentric weight 104 which rotates by 03. The member denoted by reference numeral 105 is a vibration isolator.

[0004] The wastewater containing solids discharged from the supply port 106 onto the steel mesh 102 is treated as a first stage by the steel mesh 1
02 and a solid content having a particle size passing through the mesh and a mixture of the solid content and the liquid not passing through the mesh. Next, as a second step, by vibrating the steel net 102 and decomposing the solid aggregate remaining on the mesh into individual particles, the liquid intervening in the gaps of the solid aggregate is released and separated, At the same time, the liquid component adhering to the surface of the solid content particles is sieved off.

However, in such a device,
If the mesh of the steel net 102 is made fine in order to reduce the particle size of the solids that can be separated, the separation performance in the first stage will deteriorate. In addition, the mesh is likely to be clogged with particles, and if clogging occurs, the separation performance is significantly deteriorated, and the drainage discharged from the supply port 106 may flow down from the apparatus in an unseparated state.

For this reason, it is difficult to make the mesh of the steel mesh 102 unnecessarily fine, so that the particle size of the solids that can be separated cannot be reduced. It is often used in combination with a solid-liquid separation device of the system. In order to avoid clogging of the mesh by particles, a mesh having a special cross-sectional shape may be used, but the manufacturing cost is increased. In addition, since such a device generates vibration and noise in principle, a vibration absorbing device for preventing the vibration and noise is separately required.

As shown in FIG. 5, the pressure filtration device includes endless conveyor belts 107 and 108 each comprising a pair of water-permeable filters disposed vertically adjacent to each other.
07 and 108 are driven by the prime mover 109 and circulate in the direction of the arrow. The lower belt portion of the conveyor belt 107 and the upper belt portion of the conveyor belt 108 are
10 press against each other.

The wastewater discharged from the supply port 106 is
As a step, the liquid component and the solid component that pass through the filter mesh of the conveyor belt 108 and the mixture of the solid component and the liquid that do not pass through the filter mesh are separated. Next, as a second step, the solid mass remaining on the conveyor belt 108 is decomposed into individual particles by being pressed by the pressure roller 110 between the conveyor belts 107 and 108, and is interposed in the gap between the solid masses. The liquid component is released and separated, and the liquid component attached to the particles is squeezed out.

In such an apparatus, even if a filter having a finer mesh than a vibrating sieve using a power is used, the liquid component is leached out of the filter by the pressing force of the pressure roller 110.
Solid-liquid separation performance is good. However, in general, the required power is large, and the entire apparatus becomes large. And
If the power is reduced, the processing capacity per unit time decreases.

Other known solid-liquid separation devices include a vacuum filtration device, a centrifugal filtration device, and a solid content aggregating device using a chemical treatment. These devices generally use a suspension containing a particle size smaller than silt. It is applied to solid-liquid separation and is mainly used as a secondary treatment after removing solids having a particle size larger than sand.

[0011]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above technical background, and has the following objects. SUMMARY OF THE INVENTION An object of the present invention is to provide a solid-liquid separation apparatus which can separate fine solids and liquid with a small required power, and which does not become large in size and does not generate vibration or noise. is there.

[0012]

The present invention employs the following means to achieve the above object. That is, the present invention is a belt transport device having a water-permeable endless transport belt, a supply device that discharges the solid-liquid mixture on the transport belt, and is disposed forward of the transport belt in the moving direction of the transport belt than the supply device, A solid-liquid separation device comprising: a water absorbing device including at least one pair of water absorbing rollers including upper and lower rollers provided so as to vertically sandwich the transport belt.

[0013] In such a solid-liquid separation device, it is preferable that the moving speed of the transport belt and the peripheral speed of the upper and lower water absorbing rollers substantially coincide with each other. More specifically, a pressure device is provided for pressing the upper water absorbing roller toward the lower water absorbing roller. A dewatering device including a pressure roller for pressing the lower water absorbing roller is provided adjacent to the lower water absorbing roller. A solid content recovery device is provided ahead of the water absorbing device in the moving direction of the transport belt.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention. The solid-liquid separation device includes a belt transport device 1 installed inside a body (not shown), a supply device 2 for drainage as a solid-liquid mixture, and a water absorption device 3.

The belt conveying device 1 has an endless conveying belt 4 disposed substantially horizontally. The conveying belt 4 is urged by a pressing machine such as a driving roller 5 and a hydraulic cylinder 14 to pull the conveying belt 4. Around the tension roller 6 and the direction changing roller 7. The drive roller 5 is drivingly connected to the prime mover 8 via a transmission device 12, whereby the transport belt 4 circulates in the direction of the arrow in FIG. The transport belt 4 is made of, for example, a water-permeable material such as a polyester mesh belt or a wire mesh, and the size of the transmission hole is appropriately selected from a range of about 0.1 mm to 1 mm.

The supply device 2 has a discharge port 9 for drainage. The discharge port 9 opens above the upper belt portion of the conveyor belt 4 and is connected to a pressure feeding device such as a pump (not shown).
The water absorbing device 3 is disposed ahead of the supply device 2 in the moving direction of the transport belt 4 and has a pair of upper and lower water absorbing rollers 10 and 11 sandwiching the transport belt 4 up and down. Upper water absorption roller 1
Each of the zero water absorption roller 11 and the lower water absorption roller 11 may be configured by mounting a water absorbing material made of a porous material such as a sponge around the roller body at an appropriate thickness, or may be formed of the water absorbing material itself. You may.

A hydraulic cylinder 13 as a pressurizing device is connected to the shaft of the upper water absorbing roller 10.
3, the upper water absorbing roller 10 is pressed toward the lower water absorbing roller 11. As a result, the upper water-absorbing roller 10 and the lower water-absorbing roller 11 rotate by the frictional force with the conveyor belt 4, but a drive member for rotating these rollers 10, 11 may be provided independently. Also in this case, similarly to the case of the friction force, the moving speed of the transport belt 4 and the roller 1
The peripheral velocities of 0 and 11 are matched. This allows
Wear of the upper and lower water absorbing rollers 10 and 11 can be prevented.

The dewatering device 1 is located adjacent to the lower water absorbing roller 11.
5 are provided. The dewatering device 15 has a pressure roller 16, which can be displaced toward the lower water absorption roller 11 by the action of the hydraulic cylinder 17 and compress the lower water absorption roller 11. Further, a scraper 20 as a solid content recovery device is provided ahead of the water absorbing device 3 in the moving direction of the transport belt 4. More specifically, the scraper 20 is provided such that the tip thereof abuts on the transport belt 4 that is in circumferential contact with the drive roller 5.

Next, the operation of the solid-liquid separation device configured as described above will be described. Drainage such as muddy water containing solids generated at a construction site or the like is pumped by a pump or the like, and is discharged from the discharge port 9 of the supply device 2 onto the conveyor belt 4. As a result, as shown in an enlarged scale in FIG. 2, as a first step, most of the liquid component 20 is discharged by the transfer belt 4 by gravity and kinetic energy imparted by the pumping device at the time of discharge.
Through the eyes and discharged below the device. Note that solid particles finer than the eyes of the conveyor belt 4 also pass through the eyes of the conveyor belt 4 and are discharged at this stage.

Due to the discharge of the waste water, on the conveyor belt 4,
A solid content (a single large particle 21 and its agglomerate 22) of a size that cannot pass through the eyes remains. This solid content 2
1 and 22, the liquid component is adsorbed on the surface, and the particle aggregate 22
The liquid component 23 enters the gap, and is still in a solid-liquid mixture state containing a considerable amount of liquid component.

The solid-liquid mixture that has not been subjected to the solid-liquid separation in the first stage is carried to the water absorbing device 3 with the movement of the conveyor belt 4. When passing between the upper and lower water-absorbing rollers 10 and 11 constituting the water supply device 3, as a second stage, the solid-liquid mixture is subjected to pressure acting in the vertical direction and the water-absorbing rollers 10 and 11.
The liquid adsorbed on the surface and inside of the solid components 21 and 22 and the gaps between the particle aggregates 22 is absorbed and separated by the water absorbing force mainly caused by the capillary phenomenon by the material described above. In the second stage, a part of the liquid may drop downward without being absorbed by the water absorbing rollers 10 and 11.

Then, the solid particles 21 and the particle aggregate 22 from which the liquid has been separated through the water absorbing device 3 are scraped off the surface of the conveyor belt 4 by the scraper 20 shown in FIG. Is done.

On the other hand, the liquid absorbed by the upper water-absorbing roller 10 becomes saturated as the water-retaining power of the absorbing material becomes saturated.
It leaches and drops downward due to gravity and is discharged to the lower part of the apparatus through the eyes of the conveyor belt 4 or the lower water absorbing roller 11
The secondary water is absorbed. Due to this secondary water absorbing action, the upper water absorbing roller 10 always maintains the water absorbing power.

As described above, the lower water absorbing roller 11 is
The liquid generated during the solid-liquid separation action at the stage and the liquid leached and dropped from the upper water absorbing roller 10 are absorbed. As shown in FIG. 3, a part of the liquid absorbed by the lower water absorbing roller 11 is naturally leached and dropped by gravity or centrifugal force generated by the rotation of the roller 11, and is discharged downward from the apparatus. The lower water-absorbing roller 11 is compressed by the pressure roller 16 of the dewatering device 15 to within the elastic limit, and forcibly squeezes out the liquid component, thereby recovering and maintaining the water-absorbing property.

The above embodiment is merely an example, and the present invention can be variously modified without departing from the essence thereof. For example, in the above embodiment, a pair of upper and lower water absorbing rollers is disposed as a water absorbing device, but two or more pairs of such upper and lower water absorbing rollers may be disposed. Further, the upper and lower water absorbing rollers may be changed in their material and performance. Further, the material of each water absorbing roller may be uniform, or the material may be changed between the surface and the inside. Further, it is also possible to select the particle diameter of the solid component to be separated by changing the size of the mesh of the conveyor belt.

It is also possible to improve the performance by combining two or more of the present devices. In this case, the size of the eyes of the transport belt of each device may be the same or may be changed. Further, it is also possible to use the present apparatus in combination with another type of solid-liquid separation apparatus.

[0027]

As described above, according to the present invention, the solid-liquid separation device is constituted by the water-permeable conveyance belt and the water absorption device including at least one pair of water absorption rollers. It can be separated into fine solids and liquid, and the whole apparatus does not become large and does not generate vibration or noise.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a solid-liquid separation action.

FIG. 3 is an explanatory diagram of a discharging operation of a liquid absorbed by upper and lower absorbing rollers.

FIG. 4 is a view showing a conventional powered vibrating sieve.

FIG. 5 is a diagram showing a conventional pressure-type filtration device.

[Explanation of symbols]

 1: Belt conveying device 2: Supply device 3: Water absorbing device 4: Conveying belt 5: Driving roller 8: Motor 9: Discharge port 10: Upper water absorbing roller 11: Lower water absorbing roller 12: Transmission device 13: Hydraulic cylinder 14: Liquid Pressure cylinder 15: Dehydrator 16: Pressure roller 16: Dehydrator 17: Hydraulic cylinder 20: Scraper 20: Liquid 21: Solid particles 22: Agglomeration of particles

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihisa Tsuchiya 1-29-15, Chuo, Nakano-ku, Tokyo Minato Kogyo Co., Ltd. F-term (reference) 4D026 BA03 BB05 BC12 BD02 BD07 BE06 BF11 BF19 BF20 BF21

Claims (6)

[Claims] A belt conveying device having a water-permeable endless conveying belt; a supply device for discharging a solid-liquid mixture onto the conveyance belt; and a supply device disposed before the supply device in a movement direction of the conveyance belt. A solid-liquid separation device comprising: a water absorbing device including at least one pair of water absorbing rollers including upper and lower rollers provided so as to sandwich the transport belt up and down. 2. The solid-liquid separation device according to claim 1, wherein the moving speed of the transport belt and the peripheral speed of the upper and lower water absorbing rollers substantially match. 3. The solid-liquid separation device according to claim 1, further comprising a pressurizing device that presses the upper water-absorbing roller toward the lower water-absorbing roller. 4. The solid-liquid separation device according to claim 1, wherein a dewatering device is provided adjacent to the lower water absorbing roller. 5. The solid-liquid separation device according to claim 4, wherein the dewatering device includes a pressure roller for pressing the lower water absorption roller. 6. The solid-liquid separation device according to claim 1, wherein a solid content recovery device is provided forward of the water absorption device in the moving direction of the conveyor belt.