JPH0919609A - Dehydration type cake thickness-adjusting roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dehydration type cake thickness-adjusting roll having a function of adjusting sludge thickness and a dehydrating function. SOLUTION: A partition wall 13 is installed at a suitable distance from an end side wall 12. Taking the partition wall 13 as a boundary, the outside is made an eliminated liquid scoop-up part 14 and also the inside is made a eliminated liquid collecting part 15. On the peripheral wall of the eliminated liquid collecting part 15, plural intakes 16 are formed. Inside the eliminated liquid collecting part 15, a pipe into which water is taken of suitable height planted on each intake 16 is arranged. Each intake 16 is provided with a filter medium. Plural partition plates 19 are installed in the eliminated liquid scooping out part 14. The partition wall 13 is provided with eliminated liquid inflow ports 20 each corresponding to branch chambers 18 and positioned in the partition wall peripheral edge part. Further, the end side wall 12 is provided with eliminated liquid discharge ports 21 each corresponding to the branch chambers 18 and positioned around a roll rotating shaft 22.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a dewatering type cake thickness adjustment for a belt press type dewatering machine for dewatering sludge in a water treatment facility such as tap water, sewage, and various industrial wastewater and dewatering slurry as a factory product. Regarding rolls.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional belt press type dewatering machine 1 has a plurality of rolls 2 and is stretched between the rolls 2 to form a pair of upper and lower belt-shaped filter cloth belts 3. Are provided endlessly. A rotary mixer 6 is provided above the belt press type dehydrator 1 to mix and feed the sludge 4 with the coagulant 5. The belt press type dewatering machine 1 is formed with a compression dewatering zone and a shear dewatering zone. The compression dewatering zone applies roll pressure with the roll 2, and the shear dewatering zone applies surface pressure and shear force with the roll 2. Is. A cake thickness adjusting roll 7 is provided in front of the compression dehydration zone, and the cake thickness adjusting roll 7 is separated from the filter belt 3 by a predetermined gap. The cake thickness adjusting roll 7 is forcibly driven, its peripheral speed is equal to or higher than the speed of the filter belt 3, and the gap to the filter belt 3 can be adjusted.

The sludge 8 mixed with the coagulant 5 in the rotary kneading machine 6 is supplied between the filter cloth belts 3, and while the filter cloth belts 3 move between the plurality of rolls 2, the rolling pressure by the rolls 2 is increased. It is dehydrated under the surface pressure. The desorbed liquid 9 separated from the sludge 8 between the filter cloths 3 under the pressure and surface pressure of the rolls 2 falls from the filter cloth 3 by its own weight in the initial stage of the dehydration process, and passes through the plurality of rolls 2. It gradually decreases as dehydration progresses.

[0004]

In the conventional structure described above, the cake thickness adjusting roll 7 adjusts the gap with respect to the filter cloth belt 3 to adjust the sludge 8 introduced into the compression dehydration zone to a constant thickness. , Sludge 8
On the other hand, it exerts a function to assist gravity dehydration by applying a certain pressure in the vertical direction. Also, the cake thickness adjusting roll 7
Acts as a resistance against the progress of the sludge 8 and exerts a pressure on the sludge 8 in the front-back direction along the traveling direction, so that the separated water collects on the surface of the sludge 8 near the cake thickness adjusting roll 7. However, the cake thickness adjusting roll 7 does not have the function of removing the separated water from the surface of the sludge 8, and the filter cloth belt 3 is dehydrated on one side. Therefore, the separated water that has already floated on the surface of the sludge 8 is brought to the compression dehydration zone.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a dewatering type cake thickness adjusting roll having a dewatering function as well as a sludge thickness adjusting function.

[0006]

In order to solve the above-mentioned problems, a cake thickness adjusting roll of the present invention is provided above a filter cloth belt on which sludge is placed, in front of a dehydrating section in a belt press type dehydrator. Is a hollow roll that is placed with an appropriate gap, and a partition that partitions the internal space in a direction that crosses the roll axis at a position that is separated from the end sidewall by an appropriate distance is provided. In addition to forming a pumping section, the inside of the desorption solution collection section has multiple intakes, and multiple intakes are formed on the peripheral wall of the desorption solution collection section, and each intake is planted inside the desorption solution collection section. Then, an intake pipe of an appropriate height is arranged, a filter medium is provided at each intake port, and a plurality of partition plates that partition the internal space into a plurality of compartments around the roll axis are provided in the desorption liquid pumping section.
The partition wall is provided with a desorption solution inlet for communicating the desorption solution pumping section and the desorption solution collection section, corresponding to each compartment and located at the partition wall peripheral section, and a desorption solution pumping section on the end side wall. A desorbed liquid discharge port communicating with the outside of the roll is provided corresponding to each of the compartments and located near the rotation axis of the roll.

In the above structure, the cake thickness adjusting roll evens the sludge thrown on the filter belt to a set thickness and supplies the sludge having a uniform thickness in the running direction and the width direction of the filter belt. At this time, the cake thickness adjusting roll applies a certain pressure in the vertical direction to the sludge to assist gravity dewatering, and also acts as a resistance to the progress of the sludge, and the pressure in the front-back direction along the traveling direction is applied to the sludge. Therefore, in the vicinity of the cake thickness adjusting roll, separated water will be accumulated on the surface of the sludge.

When the cake thickness adjusting roll is brought into pressure contact with the separated water, the separated water flows into the intake pipe through the filter material of the intake port, flows into the cake thickness adjusting roll through the intake pipe, and stays in the desorption liquid collecting section. To do. At this time, since the intake pipe has an appropriate height, the separated water is prevented from flowing back to the outside through the intake pipe.

The separated water that has flowed into the desorbed liquid collecting section flows into the compartment of the filtrate pumping section through the desorbed liquid inlet at the peripheral edge of the partition wall. At this time, the compartment into which the separated water has flowed is rotated around the axis of the roll with the rotation of the cake thickness adjusting roll to pump the separated water, while the desorbed liquid inlet located in the lower part of the compartment is By moving upward and the desorbed liquid discharge port located in the upper part of the compartment moves downward, the separated water pumped into the compartment of the filtrate pumping part is discharged from the desorbed liquid discharge port to the outside of the roll.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The basic configuration of the belt press type dewatering machine in this embodiment is the same as that described above, and therefore the description thereof is omitted, and only the cake thickness adjusting roll will be described.

1 to 4, a cake thickness adjusting roll 11 is a hollow roll formed of a cylindrical body 11a, and has an inner space having a roll axis center at a position separated from both end side walls 12 by an appropriate distance. A pair of partition walls 13 which are partitioned in the transverse direction
Is provided, and the partition 13 is used as a boundary to form the desorbed liquid pumping section 14 on the outer side and the desorbed liquid collecting section 15 on the inner side. A plurality of water intake ports 16 are formed on the peripheral wall of the desorbed liquid collecting section 15, and each water intake port 1 is provided inside the desorbed liquid collecting section 15.
A water intake pipe 17 having an appropriate height is arranged in the plant 6. Each water intake 16 is provided with a filter material 17a such as a stainless wire mesh.

The desorbed liquid pumping section 14 is provided with a plurality of partition plates 19 which divide the internal space into a plurality of compartments 18 around the roll axis. The partition wall 13 is provided with a desorbed liquid inlet port 20 communicating with the desorbed liquid pumping section 14 and the desorbed liquid collecting section 15 at each partition chamber 18 at the partition wall peripheral portion. A desorbed liquid discharge port 21 that communicates the desorbed liquid pumping unit 14 with the outside of the roll is provided for each compartment 18 in the vicinity of the roll rotation shaft 22.

The operation of the above configuration will be described below. The cake-thickness adjusting roll 11 is rotated around the axis of the roll rotating shaft 22, and the sludge 8 put on the filter belt 3 is leveled to a set thickness so as to be uniform in the running direction and the width direction of the filter belt 3. Supply sludge 8 of various thickness. At this time, the cake thickness adjusting roll 11 applies a constant pressure in the vertical direction to the sludge 8 to assist gravity dehydration, and also acts as a resistance against the progress of the sludge 8 along the traveling direction. Since pressure is applied in the front-back direction, near the cake thickness adjusting roll 11,
The separated water is accumulated on the surface of the sludge 8.

When the cake thickness adjusting roll 11 is brought into pressure contact with this separated water, the separated water flows into the inside of the intake pipe 17 through the filter material 17a of the intake port 16 and into the inside of the cake thickness adjusting roll 11 through the intake pipe 17. , Stay in the desorption liquid collecting section 15. At this time, since the intake pipe 17 has an appropriate height, the separated water is prevented from flowing back to the outside through the intake pipe 17.

The separated water that has flowed into the desorbed liquid collecting portion 15 flows into the compartment 18 of the filtrate pumping portion 14 through the desorbed liquid inlet 20 at the peripheral edge of the partition wall. At this time, the compartment 18 into which the separated water has flowed is rotated around the axis of the roll rotation shaft 22 in accordance with the rotation of the cake thickness adjusting roll 11 to pump up the separated water, while being located below the compartment 18. The desorbed liquid inlet 20 moves relatively upward,
By moving the desorbed liquid discharge port 21 located above in the relative downward, the separated water pumped into the compartment 18 of the filtrate pumping section 14 is discharged from the desorbed liquid discharge port 21 to the outside of the roll.

[0016]

As described above, according to the present invention, the separated water can be separated from the sludge in the cake thickness adjusting roll, so that the load brought to the dewatering section can be reduced and the cake water content can be reduced. be able to.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a cake thickness adjusting roll according to an embodiment of the present invention.

FIG. 2 is a sectional view of a cake thickness adjusting roll in the same embodiment.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2;

FIG. 4 is a view taken along the line BB of FIG.

FIG. 5 is an overall configuration diagram of a conventional belt press type dehydrator.

[Explanation of symbols]

 11 cake thickness adjusting roll 12 end side wall 13 partition wall 14 desorbed liquid pumping part 15 desorbed liquid collecting part 16 intake port 17 intake pipe 17a filter material 19 partition plate 20 desorbed liquid inlet port 21 desorbed liquid discharge port 22 roll rotation axis

Claims (1)

[Claims] 1. A hollow roll disposed at a position in front of a dewatering section of a belt press type dewatering machine, above a filter cloth belt on which sludge is placed, with an appropriate gap, and at an appropriate distance from an end side wall. A partition that partitions the internal space in a direction that intersects the roll axis is provided at a separated position, and the outside serves as a desorption liquid pumping section and the inside serves as a desorption liquid collection part, and the desorption liquid collection In addition to forming multiple intakes on the peripheral wall of the section, install water intake pipes at appropriate heights inside the desorption liquid collection unit, and install filtration media at each intake to remove water. The separating liquid pumping section is provided with a plurality of partition plates that divide the internal space into a plurality of compartments around the roll axis, and the partition has a desorbing liquid inlet port that connects the desorbed liquid pumping unit and the desorbed liquid collecting unit. Corresponding to each branch,
Further, a desorbed liquid discharge port, which is provided at the peripheral edge of the partition wall and which connects the desorbed liquid pumping unit and the outside of the roll to the end side wall, is provided corresponding to each compartment and in the vicinity of the rotation axis of the roll. A dehydration type cake thickness adjusting roll characterized in that