JP2016195973A - Belt type concentrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt type concentrator capable of improving a sludge spread performance on an endless belt.SOLUTION: A belt type concentrator 100 comprises: a sludge reception tank 1; and an endless belt 2 having permeability, being bridged between a pair of rollers 3a, 3b, and being disposed on a downstream side of the sludge reception tank 1, in which the sludge from the sludge reception tank 1 is supplied to the belt on one end side and then concentrated sludge is discharged from the other end side. When the belt type concentrator 100 is viewed from an upstream side of a sludge transport direction F, sludge supply positions (for example, opening positions 13a, 13b of branch pipes 13, 14) to the endless belt 2 through the sludge reception tank 1, are both end parts of a width direction of the endless belt 2.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a belt type concentrator that concentrates sludge such as sewage sludge.

  There exists a thing of the following patent document 1 in this kind of machine. The prior art is configured as follows. The belt type concentrator includes an endless belt having a water permeability function that is stretched over a pair of rollers. The sludge mixed with the flocculant is concentrated by removing moisture in the process of being conveyed on the endless belt.

  Here, the present applicant has the technology described in Patent Document 2 below. In the technique described in Patent Document 2, an inorganic flocculant is added to sludge on a traveling endless belt. According to this, since the endless belt is flat, sludge spreads laterally on the endless belt, and the addition of the inorganic flocculant in the endless belt part promotes the hydrophobization and densification of the floc (patent) Reference 2, paragraph 0040).

Japanese Patent No. 4016064 Japanese Patent Application No. 2014-049963

  However, it has been found that when an inorganic flocculant is added to sludge on an endless belt, there are the following problems to be solved. As described above, the sludge spreads laterally on the endless belt, but there are cases where the sludge flow rate decreases at both ends of the belt in the width direction and sludge lumps are formed at both ends, and the sludge does not spread sufficiently. . When the sludge does not spread sufficiently on the endless belt, the inorganic flocculant is added to the place where the sludge on the endless belt is not placed. Then, the added inorganic flocculant is wasted. This means that the actual addition rate of the inorganic flocculant to the sludge becomes lower than the design value, which may lead to a decrease in the concentration performance in the belt type concentrator and the subsequent dewatering performance in the dewatering process. Concerned.

  This invention is made | formed in view of the said situation, The objective is to provide the belt-type concentrator which improved the spreading | diffusion performance of the sludge on an endless belt.

  The present invention is a pair of a sludge receiving tank and a sludge receiving tank disposed downstream of the sludge receiving tank, wherein sludge from the sludge receiving tank is supplied onto a belt on one end side, and sludge after concentration is discharged from the other end side. An endless belt having water permeability that is stretched between the rollers. When the belt type concentrator is viewed from the upstream side in the sludge conveying direction, the sludge supply position to the endless belt through the sludge receiving tank is the both end portions in the width direction in the width direction of the endless belt. It is characterized by.

  According to the present invention, the spreading performance of sludge on an endless belt can be improved.

It is a side view of a belt type concentrator. It is detail drawing of the sludge acceptance tank periphery of the belt type concentrator shown in FIG. It is a perspective view which shows an example of the addition method of an inorganic flocculant.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The sludge to be concentrated in the belt type concentrator of the present invention is various organic sludge generated in the treatment process of sewage, human waste, organic industrial wastewater and the like.

(Configuration of belt type concentrator)
As shown in FIG. 1, a belt type concentrator 100 includes a sludge receiving tank 1, an endless belt 2 that is disposed on the downstream side of the sludge receiving tank 1 and has a water permeability spanned between a pair of rollers 3 a and 3 b. It has.

<Sludge receiving tank>
The sludge receiving tank 1 is a tank for receiving sludge mixed with a flocculant, and is formed by being partitioned by a part of the casing 4 of the belt type concentrator 100 in this embodiment. The flocculant added to the sludge is, for example, a polymer flocculant, and examples of the polymer flocculant include a cationic polymer flocculant and an amphoteric polymer flocculant. The sludge is supplied into the sludge receiving tank 1 by a sludge supply pipe 9 and a sludge distribution pipe 5 connected to the sludge supply pipe 9. The sludge mixed with the flocculant is supplied into the sludge receiving tank 1 through the sludge supply pipe 9 and the sludge distribution pipe 5. In addition, the addition rate of the polymer flocculent with respect to sludge is 0.5-1.8 wt%, for example.

<Sludge distribution pipe>
The sludge supply from the sludge distribution pipe 5 through the sludge receiving tank 1 to the endless belt 2 will be described with reference to FIG. FIG. 2A is an enlarged view around the sludge receiving tank 1 of the belt type concentrator 100 shown in FIG. 2 (b) and 2 (c) are a plan view of FIG. 2 (a) and an AA arrow view of FIG. 2 (a), respectively.

  The sludge distribution pipe 5 includes a header pipe 12 and a pair of branch pipes 13 and 14 extending in the horizontal direction and connected to the header pipe 12. The header pipe 12 passes through the bottom plate 4b (a part of the casing 4) of the sludge receiving tank 1 and rises upward, and from the upper end of the first pipe section 12a to the upstream side in the sludge receiving tank 1. And a second pipe portion 12b connected to the branch pipes 13 and 14 after heading. A part of the second pipe portion 12b is T-shaped.

  Here, FIG.2 (c) is a figure when the belt-type concentrator 100 is seen from the upstream of the sludge conveyance direction F (traveling direction of the endless belt 2). As shown in FIG. 2 (c), the opening positions 13a and 14a at the tips of the branch pipes 13 and 14 are horizontal (when the belt-type concentrator 100 is viewed from the upstream side in the sludge transport direction F). In the width direction, both end portions of the endless belt 2 in the width direction are used. In the vertical direction, the opening positions 13a and 14a are slightly below the endless belt 2 (slightly below the sludge liquid level, and above the sludge receiving tank 1). The opening positions 13 a and 14 a are sludge supply positions to the endless belt 2 through the sludge receiving tank 1. Moreover, the front-end | tip part containing the opening positions 13a and 14a of the branch pipes 13 and 14 is 45 degree diagonally downward so that the discharge direction of sludge faces the side plate 4a (a part of casing 4) of the sludge receiving tank 1. Further, as shown in FIG. 2A, in the side view of the belt type concentrator 100 (sludge receiving tank 1), the opening positions 13a and 14a are located on the upstream side (endless belt) in the sludge receiving tank 1. 2) and the other side. In addition, the discharge direction of the sludge from the branch pipes 13 and 14 is not limited to the above-described 45 degrees obliquely downward, and is any angle of 45 to 90 degrees (angle with respect to the horizontal direction).

<Endless belt>
The endless belt refers to a belt obtained by joining the end portions of the belt (referred to as endless processing). The belt (endless belt) is made of a metal mesh-like filter cloth, a filter cloth made of synthetic resin such as polyester, or the like. As shown in FIG. 1, the sludge transport side belt of the endless belt 2 is slightly inclined with respect to the horizontal plane so that the downstream side is slightly higher than the upstream side. Sludge from the sludge receiving tank 1 is supplied onto the belt on one end side (roller 3a side) of the endless belt 2, and the concentrated sludge is discharged from the other end side (roller 3b side). The casing 4 that accommodates the endless belt is provided with an outlet 10 for concentrated sludge and an outlet 11 for permeated water / washing waste water.

<Inorganic flocculant injection means>
As shown in FIG. 4, in the casing 4 and above the endless belt 2, a trough 8 (overflow weir) having a plurality of V notches 8 a (triangular notches) crosses the endless belt 2. Are arranged as follows.

  Here, the belt type concentrator 100 has an inorganic flocculant injection means 7. The inorganic flocculant injection means 7 is a device for adding the inorganic flocculant to the sludge (flocculated sludge) conveyed on the endless belt 2. For example, a tank for storing the inorganic flocculant, an inorganic flocculant, And a pump for feeding the agent. The inorganic flocculant from the inorganic flocculant injection means 7 falls into the trough 8 through the pipe 6, and then overflows from the V notch 8a portion (see FIG. 3). Thereby, an inorganic flocculant is added to the sludge on the endless belt 2.

  Instead of placing the trough 8 (overflow weir) above the endless belt 2, the pipe 6 is extended so as to cross the endless belt 2, and a plurality of holes are formed in the extended pipe portion. An inorganic flocculant may be added to the sludge on the endless belt 2 through the holes.

  The addition position of the inorganic flocculant is, for example, the downstream end of the endless belt 2 as shown in FIG. In addition, an inorganic flocculant may be added to any position between the center part (center part in the sludge transport direction) of the belt part running on the sludge transport side of the endless belt 2 and the downstream end part. May add an inorganic flocculant at any position between the upstream end and the downstream end.

  Examples of the inorganic flocculant include polyferric sulfate, ferric chloride, aluminum sulfate, and aluminum chloride. The addition rate of the inorganic flocculant with respect to sludge is 10-20 wt%, for example.

(Action / Effect)
As shown in FIGS. 2 (a) and 2 (b), the portion where the sludge overflows from the sludge receiving tank 1 to the endless belt 2 and the sludge flows is a slightly inclined plate 4c portion (one of the casings 4) on the downstream side. Part). Here, in the belt type concentrator 100 of the present embodiment, as shown in FIG. 2C, when the belt type concentrator 100 is viewed from the upstream side in the sludge conveying direction, the sludge supply position to the endless belt 2 is obtained. Opening positions 13 a and 14 a of certain branch pipes 13 and 14 are both ends in the width direction of the endless belt 2.

  According to this configuration, the sludge flow from the sludge receiving tank 1 to the endless belt 2 is stronger than the conventional one at the both ends in the width direction in the sludge receiving tank 1 (in the past, the central one), and the inclined plate 4c. It is possible to prevent sludge from staying at both ends E in the width direction of the part. As a result, when the sludge flows over the endless belt 2 beyond the inclined plate 4c, the sludge easily flows over the endless belt 2 over the entire width direction of the endless belt 2. Thereby, the spreading | diffusion performance of the sludge on the endless belt 2 improves. In addition, since the spreading performance of the sludge on the endless belt 2 is improved, an inorganic flocculant such as polyferric sulfate can be evenly added to the sludge on the endless belt 2.

  Moreover, in this embodiment, the sludge distribution pipe 5 comprised by the header pipe 12 and the two branch pipes 13 and 14 by which the opening position 13a, 14a of the front end was connected to the header pipe 12 which is the said sludge supply position. The sludge spreading performance on the endless belt 2 is improved. According to this structure, the spreading performance of the sludge on the endless belt 2 can be improved by a simple modification of the existing belt type concentrator 100.

  Further, in the present embodiment, the opening positions 13 a and 14 a of the branch pipes 13 and 14 are arranged on the upstream side in the sludge receiving tank 1. According to this configuration, accumulation of sludge on the upstream side can be prevented.

  Further, in the present embodiment, the header pipe 12 of the sludge distribution pipe 5 passes through the bottom plate 4b of the sludge receiving tank 1 and rises upward, and the sludge receiving tank 1 from the upper end of the first pipe section 12a. It is set as the pipe | tube which has the 2nd pipe part 12b connected to the branch pipes 13 and 14 after heading to an upstream inside. According to this configuration, in plan view (see, for example, FIG. 2B), the header pipe 12 is disposed between the two branch pipes 13 and 14 and downstream of the two branch pipes 13 and 14. The part will be located. According to this, since the sludge flow to the central portion in the sludge receiving tank 1 is weakened by a part of the header pipe 12, the sludge flow from the sludge receiving tank 1 to the endless belt 2 is at both ends in the width direction. The strengthened effect is enhanced.

  Furthermore, in this embodiment, the sludge discharge direction from the branch pipes 13 and 14 of the sludge distribution pipe 5 is set to be obliquely downward toward the side plate 4a of the sludge receiving tank 1. According to this structure, the agitation effect of the sludge which prevents that sludge accumulates in the bottom part of the sludge acceptance tank 1 is acquired.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. .

1: Sludge receiving tank 2: Endless belt 3a, 3b: Roller 4: Casing 5: Sludge distribution pipe 12: Header pipe 13, 14: Branch pipe 13a, 13b: Opening position 100: Belt type concentrator F: Sludge conveyance direction

Claims (5)

A sludge receiving tank;
Permeable water placed between a pair of rollers, disposed downstream of the sludge receiving tank, wherein sludge from the sludge receiving tank is supplied onto a belt on one end side and concentrated sludge is discharged from the other end side. An endless belt having
In a belt type concentrator comprising:
When the belt type concentrator is viewed from the upstream side in the sludge conveying direction, the sludge supply position to the endless belt through the sludge receiving tank is the both end portions in the width direction in the width direction of the endless belt. A belt-type concentrator. The belt type concentrator according to claim 1,
A sludge distribution pipe for supplying sludge into the sludge receiving tank;
The sludge distribution pipe is
A header tube,
A belt-type concentrator, comprising: two branch pipes connected to the header pipe, the opening position of the tip of which is the sludge supply position. The belt type concentrator according to claim 2,
The belt type concentrator, wherein the opening position of the branch pipe is an upstream side in the sludge receiving tank. The belt type concentrator according to claim 2 or 3,
The header tube is
A first pipe portion that passes through the bottom plate of the sludge receiving tank and rises upward;
A second pipe connected to the branch pipe after going from the upper end of the first pipe to the upstream side in the sludge receiving tank;
A belt type concentrator, characterized by comprising: In the belt type concentrator according to any one of claims 2 to 4,
A belt type concentrator, wherein a sludge discharge direction from the branch pipe is an obliquely downward direction toward a side plate of the sludge receiving tank.

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