JP2000292061A - Gravitational dewatering equipment for sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gravitational dewatering equipment for sludge excellent in dewatering performance which can be installed in a small occupation area without requiring a significant labor. SOLUTION: Water containing sludge 50 is supplied to the upper part of a long porous tubular body 10 installed vertically and dewatered sludge is discharged from a lower discharging part of the body. A filtering pipe 24 passing water of sludge is secured vertically in the body and means 22 for pressing sludge against the filtering pipe though rolling or rotation is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gravity type sludge escaping device, and more particularly, to a sludge dewatering device for squeezing the water content of hydrated sludge using gravity.

[0002]

2. Description of the Related Art Generally, hydrated sludge generated from sewage, factory drainage, or civil engineering work sites is subjected to dehydration treatment after settling with a flocculant. Conventional dehydration treatment mainly involves mechanical dehydration using a centrifuge, a belt press, a screw press, or a filter press. In addition, a dewatering device is used in which a material, such as a mesh sheet or a filter cloth, which allows only the water content of sludge to pass around the processing vessel, and a metal perforated plate is stacked as a reinforcing agent. I have.

[0003]

However, all of the above-mentioned conventional mechanical dehydrators require a large installation area. In the case of a device using a filter cloth,
There is an inconvenient problem that requires replacement of the filter cloth due to clogging of the filter cloth and requires time and effort.

[0004] Therefore, an object of the present invention is to solve the inconveniences of the above-mentioned conventional dewatering apparatus for hydrated sludge, which has a good dewatering property and a small installation area. It is an object of the present invention to provide a gravity-type sludge dewatering device which is completed and does not require any trouble.

[0005]

Means for Solving the Problems In order to solve the above problems, the first invention has the gist of the structure described in claim 1.

For this reason, in the first invention, the water content of the hydrated sludge supplied into the main body is discharged by the gravity of the sludge itself through the porous portion of the main body and the vertical filter tube provided in the main body. . Since the sludge is pressed against the filter tube by the pressing means, the water content of the sludge in the main body can be introduced into the filter tube. Further, when the pressing means is rotated or rotated in the sludge, the sludge inside falls down, and is sequentially dehydrated into a dewatered sludge without a bridging phenomenon. This dehydrator has the advantage that the installation area is small because the main body is provided vertically.

[0007] The second invention has a gist of the structure described in claim 2.

In the second aspect of the present invention, the hydrous sludge in the main body is urged downward by the rotating body, so that the dewatering property of the hydrous sludge is further improved. Since the rotating body urges the sludge downward, the sludge in the main body does not cause a bridging phenomenon.

[0009] The third invention has a gist of the structure described in claim 3.

In the third aspect, the dewatered sludge discharged from the discharge portion is received by the receiving portion of the sludge receiving means and is conveyed to a predetermined portion. Since the dehydrated sludge is transported outside the main body, it is possible to supply hydrous sludge to the upper part of the main body.

[0011] The fourth invention has a gist of the structure described in claim 4.

In the fourth aspect of the invention, the water dewatered from the hydrous sludge in the main body is received by the water receiving means at the lower portion of the main body and discharged to a predetermined portion.

[0013]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 shows a state in which a hydrated sludge (organic or inorganic, or a mixture of both of them) 50 supplied to the upper part of the apparatus from a supply pipe 45 provided above the erected apparatus is dehydrated in the apparatus, and a discharge port 31 (the main body) is provided at the lower end of the apparatus. 1 shows the entire dewatering apparatus 1 having a vertical structure for discharging as dewatered sludge 52.

That is, as shown in FIG. 2, the main body 10 of the dehydrating apparatus 1 is provided with a plurality of short cylinders 5 to 5 each comprising a perforated plate 4 having a large number of holes 3 and arranged vertically. 6-6, each of which is formed of a long cylindrical shape having a fixed inner diameter joined with a packing (not shown) interposed therebetween. The main body 10 of this embodiment is made of a punching metal having a punch hole having a diameter of 1 mm and has a height of 560 mm and a diameter of 520 mm.
10 short cylinders 5 to 5 are connected in series and the height is 5600
mm.

As shown in FIGS. 1 and 2, the main body 10 to which the short cylinders 5 to 5 are joined has reinforcing wires 7 to 7 inserted into appropriate positions of the joining flanges 6 to 6 so that the main body 10 is reinforced. ing. As shown in FIG. 1, the main body 10 is erected vertically with its lower end firmly fixed on a support member 8.

A rotary shaft 11 made of a long tubular body is protruded to a lower portion of the main body 10 at an axial position in the longitudinal direction in the main body 10 erected, and is formed by a lower thrust bearing 12 and a bearing 13 at the upper end of the main body 10. It is rotatably supported.

As shown in the lower part of FIG. 1, a coupling 14 and a chain wheel 15 are attached to the lower end of the rotating shaft 11, and a motor M with a speed reducer is fixed near the lower end of the rotating shaft 11. It is attached to member G. A chain wheel 16 is attached to a drive shaft of the motor M. The chain 17 is connected between the chain wheel 15 and the chain wheel 16 by a chain 17. The rotation of the motor M is transmitted to the rotation shaft 11, and the rotation shaft 11 rotates at low speed (for example, 1 to 2 rpm).
m).

As shown in FIGS. 1 and 3, a spiral urging blade 20 for urging the hydrous sludge 50 downward is attached to the upper part of the rotating shaft 11 in the main body 10.

As shown in FIGS. 1, 4 and 6,
In a portion of the rotating shaft 11 below the urging blade 20, a wet sludge or a partially dewatered sludge 50 is filtered by a filtration tube 24 described later.
The blade pieces 22 to 22 are pressed in a vertical direction and are attached at a predetermined angle in the vertical direction for pressing against the side surfaces of the blades 24 to 24 to dehydrate and eliminate the bridging phenomenon.

On the other hand, as shown in FIGS.
Filter tubes 24 to 24 along the longitudinal direction of the main body 10 are attached at positions below the urging blades 20 and at positions not interfering with the respective blade pieces 22 to 22.

Each of the filtration tubes 24 to 24 is a perforated tube having an upper end closed and having a large number of holes 25 to 25 on the side surface through which water passes, and a lower portion is provided in the tube as shown in FIGS. It is configured to discharge water (also referred to as water) W therein. As shown in FIG. 6, each of the filtration tubes 24 to 24 is symmetrically arranged around the rotation shaft 11, is held by a support member (not shown) so as not to hinder the passage of the sludge 50, and has the main body 10. Supported within. The water W of the hydrous sludge or the sludge 50 on the rotating shaft 10 side is removed by the respective filtration tubes 24 to 24.

As shown in FIGS. 1 and 9, a cylinder 27 having the same diameter as the main body 10 and having a non-peripheral surface is provided directly below the lower end of the main body 10.
Are attached around the rotating shaft 11 and the main body 1
The lower end of the rotary shaft 11 is sharpened upward, and the lower end has a conical bottom surface 30 whose outer periphery is larger than the cylinder 27.
1 and is fixed to the support member 8 via a support member (not shown).

As shown in FIG. 9, an annular gap is formed between the lower end of the cylinder 27 and the outer periphery of the lower part of the conical bottom surface 30 as the discharge port 31 of the dewatered sludge 52. An annular lid 28 for opening and closing the discharge port 31 is provided below the cylinder 27.
Is mounted so as to be slidable up and down.

When the annular gap is closed by the annular lid 28, the dewatered sludge 52 collects above the conical bottom surface 30, and the annular lid 28 is closed.
When the annular gap is opened, the dewatered sludge 52 on the conical bottom surface 30 is discharged.

As shown in FIG. 1 and FIG.
The dewatered sludge 52 discharged from the discharge port 31
A receiving tank 35 and a sludge receiving means 36 for sending the dewatered sludge 52 in the receiving tank 35 to a storage tank or the like are provided.

The receiving tank 35 is formed around the rotary shaft 11 as a tank structure having a sufficiently open upper part and a narrow lower part so as to reliably receive the dewatered sludge 52 discharged from the discharge port 31. . At the bottom of the receiving tank 35, a transfer device 36 for sending the dehydrated sludge 52 in the tank to a predetermined storage tank is formed. The transfer device 36 in FIGS. 1 and 9 is a screw conveyor.

As shown in FIGS. 1 and 9, on the outer periphery of the cylinder 27, water W which is squeezed by the hydrated sludge 50 and falls on the outer surface of the main body 10, and water discharged from the filtration pipe 24 A water receiver 40 for receiving W is assembled. Water catch 4
Numeral 0 is formed in a gutter shape extending outward from the outer diameter of the lower end of the main body 10, and a conduit 41 for sending water W in the water receiver 40 to a predetermined portion such as a water storage tank is attached to a part of the bottom surface of the water receiver 40. Have been. (The water receiver 40 and the conduit 41 correspond to the water receiver of the present invention.)

A supply pipe 45 for the hydrated sludge 50 is arranged at the upper part of the main body 10 so that the hydrated sludge 50 can be supplied to the main body 10. A level detector 47 for detecting the level of the hydrated sludge 50 in the main body 10 is provided at the upper end of the main body 10.
Is installed. When the level detector 47 detects the low level L, an electric instruction is issued, the wet sludge 50 is supplied from the supply pipe 45, and the level detector 47 is set to the high level H.
Is detected, the supply of the hydrated sludge 50 in the supply pipe 45 is stopped by an electric instruction.

Now, the annular lid 28 of the cylinder 27 is slid downward, the discharge port 31 is closed, the hydrous sludge 50 is supplied into the main body 10 to the high level position of the level detector 47, and the motor M is driven. In this state, the rotating shaft 11 is rotated at a low speed via the chain wheel 16, the chain 17, and the chain wheel 15. In this state, the water-containing sludge 50 is not supplied from the supply pipe 45.

However, since the water-containing sludge 50 is filled up to the high level H in the main body 10, the sludge 50
Part of the water W is naturally dehydrated by its own gravity, and the body 1
0 It is discharged from the holes 3 to 3 on the outer periphery and falls along the outer peripheral surface of the main body 10.

When the urging blade 20 of the rotating shaft 11 urges the hydrous sludge 50 downward in the main body 10, the hydrous sludge 50 below the urging blade 20 is compressed, dehydrated, and dehydrated.
Is discharged from the holes 3 to 3 on the outer periphery. Furthermore, the rotating shaft 1
The first blade pieces 22 to 22 press the sludge 50 against the respective filtration tubes 24 to 24 by the rotation of the rotating shaft 11 so that the filtration tubes 24 to
Sludge 5 around the rotation axis 11 in the main body 10 in which
0 water W enters the filtration tubes 24 to 24, falls, and
0 It is discharged outward at the lower end.

Although the sludge 50 is in a state of being filled up to the high level H position of the main body 10, since the blade pieces 22 to 22 rotate and the urging blade 20 urges downward, the sludge 5
The sludge 50 on the upper part can be sequentially dropped downward and dewatered without causing the zero bridge phenomenon.

The water W falling on the outer peripheral surface of the main body 10 and the water W of the filtration tube 24 discharged from the lower end of the main body 10 are introduced into a receiving tank 35 and sent to a storage tank or the like. On the other hand, the annular lid 28 is opened, and the hydrated sludge 50 in the main body 10 is discharged from the outlet 31.
And is stored in the receiving tank 35. The wet sludge 50 in the receiving tank 35 is sent into a predetermined storage tank by a screw conveyor.

When the dewatered sludge 52 is discharged from the outlet 31, the wet sludge 50 on the upper surface of the main body 10 is at the low level L position, and the new wet sludge 50 is supplied from the supply pipe 45 to the high level H position. You. Thereafter, the same operation as described above is performed, and the dewatering treatment of the hydrated sludge 50 is continuously performed.

In the above embodiment, the blade pieces 22 to
22 is a structure that rotates together with the rotating shaft 11, but the blade pieces 22 to 22 attached to the rotating shaft 11 press the sludge 50 against the filtration tubes 24 to 24, and remove the water W from the filtration tubes 24 to 24.
A structure that reciprocates so as to be able to flow into the inside 24 may be used. (Not shown).

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a dehydrating apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of a short cylinder forming a main body.

FIG. 3 is an enlarged view showing a sludge biasing blade of a rotating shaft.

FIG. 4 is an enlarged view of a main part showing a blade piece of a rotating shaft.

FIG. 5 is an enlarged view as viewed from an arrow A in FIG. 1;

FIG. 6 is an enlarged sectional view taken along line VI-VI of FIG. 1;

FIG. 7 is an enlarged sectional view taken along line VII-VII in FIG. 1;

FIG. 8 is an enlarged sectional view showing a lower structure of a dehydrating device filter tube.

FIG. 9 is an operation explanatory view showing a means for transporting dewatered sludge in a lower part of the dewatering device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dehydration apparatus 4 Perforated plate 10 Main body 11 Rotating shaft 12 Thrust bearing 13 Bearing 15,16 Chain wheel 17 Chain 20 Energizing blade 22 Blade piece 24 Filtration tube 25 Hole 27 Cylindrical 28 Ring lid 30 Conical bottom 31 Discharge port 35 Receiving tank 36 Conveying means 40 Water receiver 41 Conduit 45 Supply pipe 50 Wet sludge 52 Dewatered sludge M Motor W Water (moisture)

Claims (4)

[Claims] 1. An apparatus for supplying hydrated sludge to an upper part of a long, porous, tubular main body which is erected in a vertical direction, and discharging dehydrated sludge from a discharge part at a lower part of the main body. In the main body, a vertical filter tube capable of flowing in sludge water is fixed in a vertical direction, and a pressing means for rotating or rotating the vertical filter tube to press the sludge against the vertical filter tube is provided. A gravity type sludge dewatering device characterized by the following. 2. The gravity type sludge dewatering apparatus according to claim 1, further comprising a rotating body for urging the water-containing sludge in the main body downward. 3. The gravity type sludge according to claim 1, further comprising sludge receiving means for receiving the dewatered sludge discharged from the discharge portion at a receiving portion and sending the sludge to a predetermined portion. Dehydration equipment. 4. The gravity type sludge dewatering apparatus according to claim 1, wherein a water receiving means for receiving dehydrated water and discharging the water to a predetermined portion is provided on an outer periphery of a lower part of the main body.