JPS6190715A - Gravity dehydrator of sludge - Google Patents

Abstract

PURPOSE:To enhance the efficiency of dehydration by mixing the sludge in a filter cloth with an agitator, and carrying out uniformly the gravity dehydration of the sludge. CONSTITUTION:An agitator 15 is arranged, and the leading end of the agitator 15 is inserted into an upper opening part of a filter cloth 1 to mix the sludge in the filter cloth 1. Accordingly, the sludge in the vicinity of the filter cloth 1 is grooved or the sludge at the central part is moved to the vicinity of the filter cloth 1 by the action of the agitator 15, and the sludge is uniformly drained. Besides, the effect of the gravity dehydration device 10 of a blet-press type sludge dehydrator is improved by the compressing action of the agitator 15 exerted on the sludge. Consequently, a high pressure load can be exerted in a squeeze dehydrator 30, the efficiency of dehydration can be enhanced, and the overall efficiency in dehydrating the sludge can be improved.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a gravity dewatering device for a belt press type sludge dewatering machine,
That is, the present invention relates to a gravity dewatering device equipped with a bag-like filter cloth that is opened at the top and inserted into the interior to drain water-containing sludge.

(Prior Art) A belt press type sludge dewatering machine is generally constructed by combining a gravity dewatering device and a pressure dewatering device. A gravity dewatering device is one in which water-containing sludge is put into a bag-like filter cloth with an open top and subjected to gravity dehydration. A pressure dewatering device is a device that dehydrates sludge by sandwiching gravity-dehydrated sludge between two endless filter cloths and pressurizing the sludge. By applying high pressure to the sludge, this pressure dewatering device can further improve the efficiency of dewatering the sludge.

However, it is known that if high pressure is applied to sludge, which has a high water content and is fluid, by sandwiching it between two endless filter cloths, the sludge will come out from the filter cloth. ing. From this, in order to increase the efficiency of sludge dewatering in the clamping pressure dewatering device, it is necessary to remove as much water from the sludge as possible in the gravity dewatering device to lower its water content.

FIG. 1 is a schematic diagram showing a state in which sludge is placed in a bag-like E cloth 1 of a conventional gravity dewatering device. In this bag-shaped filter cloth 1, the sludge a near this part drains well, but the sludge in the central part drains poorly. For this reason, conventional gravity dewatering equipment cannot reduce the water content of sludge very much, and as a result, there is a limit to the sludge dewatering efficiency of the squeeze dewatering equipment.

(Technical Problem of the Invention) The present invention was made to solve this problem, and its purpose is to increase the efficiency of gravity dewatering in a gravity dewatering device, thereby increasing the pressure load in a clamping dewatering device. In addition, the present invention provides a gravity dewatering device that makes it possible to increase dewatering efficiency.

(Summary of the invention) The present invention has been made to achieve this purpose,
A stirrer is placed in which the tip of the stirrer is inserted into the upper opening of the filter cloth to stir up the sludge within the mud surface, and by the action of this stirrer, a groove is cut in the sludge a near the filter cloth as shown in Fig. 1. Alternatively, the sludge in the center is moved to a position close to the filter cloth to make the sludge drain uniformly, and the effect of the gravity dewatering device is improved by the compressive action of the agitator on the sludge.

(Example) The present invention will be described below with reference to illustrative embodiments.

FIG. 2 schematically shows the entire belt press type sludge dewatering machine. This dewatering machine includes a gravity dewatering device 10 that gravity dehydrates sludge, an extrusion molding device 20 that extrudes the gravity dehydrated sludge into minced shapes, and the minced sludge is passed between two endless filter cloths 2 and 3. A clamping pressure dehydration device 30 that performs clamping dehydration by sandwiching between the two is disposed, and this clamping pressure dehydration device Rso is composed of a low-medium pressure dehydration section and a high-pressure dehydration section.

As schematically shown in FIG. 2, the gravity dewatering device has a U-shaped cross section with a chain 13 disposed between a pair of sprockets 1 and a pair of sprockets 12, and an upper part opened between the chains 13. Alternatively, a plurality of V-shaped bag-like filter cloths 1 are arranged in a row. Further, a tray 14 is arranged below the filter cloth 1 in the upper part to collect the water generated by dewatering the sludge. The chain 13 moves in the direction of arrow X.

FIG. 3 shows an enlarged view of the main parts of the gravity dewatering device. In the present invention, a stirrer 15 for stirring the sludge in the bag-like filter cloth 1 is provided. This stirrer 15 has arms 16 along the longitudinal direction of the bag-like filter cloth 1 (direction perpendicular to the direction of movement of the bag-like filter cloth), and a stirring plate 17 attached to the tip of the arm 16. There is. A shaft 18 passes through each stirring plate 17 and is integrally fixed thereto. The arm 16 is rotatable in the directions of arrow X and arrow Y around the base end of the arm, and the arm moves with the movement of the filter cloth without requiring a driving source. The stirring plate 17 inserted into the filter cloth 1 cuts a groove in the sludge in the filter cloth (for example, from P1 to P,
→P, →P4) Move to stir the sludge.

As a result, the sludge in the periphery of the filter cloth is drained, and the sludge in the center of the filter cloth is mixed with the sludge in the periphery, and the sludge drains uniformly, increasing dewatering efficiency. . Furthermore, by inserting the stirring plate 17 into the sludge, the sludge is compressed, which also improves dewatering efficiency.

4 to 7 show other embodiments of the invention. The stirrer shown in Fig. 4 has a plurality of disks 42 disposed on a shaft 41 at regular intervals and obliquely to the direction perpendicular to the shaft 41, so that the shaft 4 can be rotated and moved up and down. It is composed of When the filter cloth 1 is in a predetermined position, this agitator inserts the shaft 4 and the discs 42 into the sludge in the filter cloth 1 and rotates the discs 42 all the way, thereby stirring the sludge.

The agitator shown in FIG. 5 has a plurality of agitation plates 52 arranged around a rotating drum 51, and when the agitation plates 52 are positioned downward, the agitation plates 52 are inserted into the filter cloth. It is arranged so that it is in the state that Then, the rotational speed of the rotary drum 51 is synchronized with the traveling speed of the p cloth 10, and the stirring plate 5
2... stirs the sludge.

The stirrer shown in FIG. 6 has a plurality of stirring plates 61 arranged in a line along the longitudinal direction of the filter cloth 1, and these stirring plates 61...
・It has a structure in which it is moved up and down by a cam or cylinder 62. Then, the vertical movement of the cylinder 62 is synchronized with the traveling speed of the filter cloth, and the sludge is stirred by the stirring plates 61.

The agitator shown in FIG. 7 has a pair of streak rockets 71 and 72 arranged above the filter cloth 1, a chain 73 wrapped around these, and a plurality of stirring plates 74... F
They are arranged in rows in the width direction of the cloth 1. Then, by synchronizing the movement of the chain 73 with the traveling speed of the filter cloth, the stirring plate 74
... stirs the sludge in the door cloth 1.

The agitator of the present invention is not limited to the above-mentioned embodiments, but any type of agitator can be used as long as it can directly or indirectly act (for example, vibrate) on blood and flesh sludge to uniformly drain the sludge. But that's fine.

(Effects of the Invention) According to the present invention, since the sludge in the mud surface is stirred by the agitator, the gravity dewatering of the sludge is uniformly performed, and as a result, the dewatering efficiency is improved. Furthermore, when stirring the sludge, the sludge is compressed, and this action also increases the efficiency of sludge dewatering. As a result, in the clamping pressure dewatering device, it becomes possible to increase the dewatering efficiency by applying a high pressure load, and the overall sludge dewatering efficiency can be significantly improved.

74... Stirring plate.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the dehydration state of sludge in the bag furnace blood of a gravity dehydration device, Fig. 2 is an overall schematic diagram showing an example of the belt press type sludge dehydrator according to the present invention, and Fig. 3a is FIG. 3b is a longitudinal sectional view showing an enlarged main part of the gravity dewatering apparatus according to the present invention, FIG. 4a, 5a, 6a and 7a are cross-sectional views, FIGS. 4b, 5b,
Figures 6b and 7b are MAT plane views.

Claims (1)

[Claims] In a sludge gravity dewatering device that drains water by placing water-containing sludge in a bag-like filter cloth with an opening at the top, an agitator that stirs the sludge inside the filter cloth by inserting the agitator tip into the top opening of the filter cloth is used. A sludge gravity dewatering device characterized by the following: