JPS5876107A - Apparatus for precipitation treatment of soft sludge - Google Patents

Abstract

PURPOSE:To enhance the treating capacity of soft sludge, by providing a water permeable line body which is moved in a soft sludge storage tank and taken up to the outside and a means for removing soft sludge adhered to said line body out of said tank as the movement thereof to accelerate the precipitation speed of said soft sludge. CONSTITUTION:A main apparatus as the precipitation treatment part of a soft sludge treating vessel is constituted from a soft sludge storage tank 30, winders 15, 15', washing machines 16, 16' as soft sludge removing means and rope like or narrow strip like water permeable line bodies 17, 17'. In this apparatus, the line bodies 17, 17' provided under tension in the storage tank 30, into which sludge 4 is introduced, are moved by the winders 15, 15' and drive pulleys and sludge adhered to the line bodies 17, 17' is removed by the adhered sludge removing means such as the washing machines 16, 16' provided to the outside of the storage tank 30. As the resut, the clogging of the line bodies 17, 17' are prevented as well as consolidation promoting effect of the sludge 14 is held and the precipitation speed of consolidated sludge can be accelerated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soft mud sedimentation treatment device suitable for treating dredged soft mud by settling it in a ship. Another option is to mix a hardening agent such as Portland cement with the sludge to prevent the harmful substances in the sludge from escaping, and then dump the sludge in a landfill. In this method, the dredged sludge is poured into a vast mud storage pond built on land, where the settled soil is sucked up and sent to a solidification treatment plant, where a hardening agent is mixed and then dumped into a landfill. There is.

However, such conventional methods require a site for installing a mud storage pond, solidification plant, etc. in close proximity to the construction area, and dredged sludge is transported over a long distance from the dredged area to the solidification treatment area, and from there to the landfill site. The sludge must be transported over several routes, and processing the sludge as super soft sludge requires a great deal of cost. This disadvantage becomes more pronounced as the dredged area gets farther from land.

In order to deal with such problems, the present inventors have previously developed a soft mud processing vessel. As shown in FIG. 1, this soft mud treatment vessel 5 includes a sedimentation treatment section 19, a forced thickening device 2. Solidification processing section 3. Equipped with a water treatment plant 4, etc., and capable of carrying out all processes of soft mud treatment on board, the present invention attempts to provide a soft mud sedimentation treatment device suitable for use in the sedimentation treatment section 1 of the soft mud treatment ship 5. 0 Since the dredged sediment sedimentation processing section 1 has a huge amount of processing capacity,
As shown in Fig. 2, in many cases the supernatant water 13 and the sludge 14 are simply separated by gravity settling (natural sedimentation) in the soft mud storage tank 30. In the case of soil made of such fine particles, it takes a long time for it to settle, and it takes even longer if it tries to become compacted due to its own weight.

Therefore, an object of the present invention is to provide a device that increases the settling speed and improves the performance of soft mud treatment during sedimentation treatment of soft mud. The system is equipped with a soft mud storage tank for processing the soft mud, a permeable strip that moves inside the soft mud storage tank and is rolled up to the outside, and a winder or drive pulley for the strip. In order to remove the soft mud that adhered to the above-mentioned strips as they moved,
The present invention is characterized in that a soft mud removing means is provided on the path of the strip outside the soft mud storage tank.

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
3.4 shows a soft mud sedimentation treatment apparatus as a first embodiment of the present invention, FIG. 3 is a sectional view thereof, and FIG. 4 is a plan view thereof.

As shown in Fig. 3.4, this device is used as a sedimentation treatment section l in a soft mud treatment ship, and is installed in a soft mud storage tank 30° winding machine 15.
．． 15', washing machine 16.16' as a means for removing soft mud;
Rope-shaped or narrow band-shaped water-permeable strip] 7, 17'
It consists of...

Figure 3 shows a rope-like or narrow band-like water permeable strip 1.
7.17', . . . (hereinafter represented by reference numeral 17) are arranged in three stages, but the number of stages may be further increased or conversely, the number of stages may be decreased.

As shown in FIG. 4, the number of planar arrangements of water permeable strips 17 (
The number of rows) can also be increased or decreased as appropriate depending on the dimensions of the soft mud storage tank 30, etc.

Note that a porous or fibrous porous material is used as the material for the water permeable strips 17, and if the water permeability of this material is high, water can drain through the water strips 17 in the sludge (soft mud). be done.

The winder 15.15' moves the permeable strip 17 into the soft mud storage tank 3.
However, when the winder 15 has completely wound up the strip 17, the winder 15' unwinds the strip 17; When winding up the strip 17, the winder 15 unwinds the strip 17.

When the winding machine 15 is winding up, the cleaning machine 16, 16' serving as a means for removing attached sludge is activated. 5 is a sectional view showing a soft mud sedimentation treatment apparatus as a second embodiment of the present invention, in which a cleaning machine 16' adjacent to the machine is operated. In the case of this second embodiment, the number of depthwise arrangement (stages) of the water permeable strips 17 and the planar arrangement are also important. The number (number of rows) is determined as appropriate in consideration of the dimensions of the soft mud storage tank 30, etc.

Next, the operation and effects of the device of the present invention will be explained.

First, to explain the case of only simple sedimentation due to its own weight, assuming that the sludge element 19 exists in the sedimentation sludge 14 as shown in FIG. As shown in Figure 7, it consists of sludge particles 20 and gaps 21, and most of the gaps 2 are filled with water.Now, if we try to further consolidate the element 19, , that is, if we try to increase the density and concentrate,
In order to reduce the gap 21 in the element 19, the water in the gap 21 must be drained, but the drained water eventually reaches the supernatant water 13. However, since the water permeability of sludge is extremely poor, it takes a long time to move the distance 2 between the element 19 and the supernatant water 13.

However, as shown in Figure 6, there is a water-permeable strip 1 in the sludge tank.
7 is stretched, the water in the sludge is transmitted through this strip 17 and drained to the outside, so the drainage distance is shortened from 2 to 2', increasing the consolidation speed. be able to.

According to the one-dimensional consolidation theory (Terzaghi's theory), the consolidation rate is proportional to the square of the layer thickness.
When fc is used to reduce the drainage distance to 1/3, consolidation proceeds at about 10 times the speed.

In the case of this example, self-weight consolidation is used, so the effect is slightly different from the effect estimated from the above theory, but it is still possible to greatly improve the consolidation speed by shortening the drainage distance. Therefore, the water permeability As the number of stages and rows of the strips 17 increases, the effect will also increase.

The reason for using the rope-like or narrow band-like strip 17 as a water-permeable material is as follows. As consolidation progresses, the sludge naturally moves downward. As shown in Figure 8 (al, (bl), rope-like or narrow strip strips 1 of water-permeable material.
7, the sludge particles in the sludge 14 have the code 2
As shown in Figure 2, the sedimentation continues, and the sedimentation action is not significantly inhibited, but as shown in Figure 9, there is a wide permeable sea) 17
If a is used, the sedimentation action of the sludge particles is inhibited.0 As can be seen from the above, when the rope-like or narrow band-like strip 17 is used as the water-permeable material, the movement of the sludge within the sedimentation treatment section l is inhibited. No obstruction 0 Further, the reason why the water permeable strip 17 is moved and the cleaning machine for removing attached sludge is used is as follows.

As already mentioned, the use of the water-permeable strips 17 promotes consolidation, but there is a possibility that sludge may adhere to the periphery of the water-permeable strips 17. The sludge that has adhered to the sludge has become compacted, so the pores have become smaller, and its water permeability is lower than that of the original sludge, causing a so-called clogging phenomenon. When such a clogging phenomenon occurs, the effect of promoting consolidation of the water permeable strips 17 is ultimately reduced.

On the other hand, as in the apparatus of the present invention, when the water permeable strip 17 is moved by the winding machine 15, 15' or the drive pulley 18, and the attached sludge is removed by an attached sludge removal means such as a washer 16, 16', the attached sludge is removed. , clogging of the water-permeable strips 17 can be prevented, and the compaction promoting effect can be maintained.

As detailed above, according to the apparatus of the present invention, the following effects can be obtained.

(1) By shortening the drainage distance of water in sludge, the consolidation sedimentation rate can be increased.

(2) Rope-shaped or narrow band-shaped water permeable strip 1
7 is used, the movement of sludge within the sedimentation treatment section l is not inhibited.

(3) Since the water-permeable strips 17 are moved while removing the sludge attached to them, performance deterioration due to clogging can be prevented.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an outline of a soft mud processing vessel, FIG. 2 is a sectional view showing a conventional device as a soft mud sedimentation processing section in the soft mud processing vessel, and FIGS. 3 is a sectional view thereof, FIG. 4 is a plan view thereof, and FIG. 5 is a soft mud sedimentation treatment apparatus as a second embodiment of the present invention. 6 is an explanatory diagram showing the action of the device of the present invention, FIG. 7 is a schematic diagram of sludge (soft mud), and FIG. Fig. 9 is an explanatory diagram showing the settling state of sludge particles around the permeable sheet. 1. Soft mud settling section, 2. Forced thickening device, 3.・
Solidification processing department, 4Φ/water treatment plant. 5. Soft mud treatment ship, 6. Dredged soft mud, 13. Super clear water,
14. Sludge, 15. 15' Fist winder, 16.
16'...Washing machine as a means of removing soft mud, 17.17'
...Water-permeable strip, 18.. Drive boolean 19.. Element of sludge, 20. Sludge particles, 21.. Gap filled with water, 22.. Direction of sedimentation of sludge particles, 30.
・Soft mud storage tank. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 1 Map 2 Figure 3 Figure 3 Figure 41 Figure 5 Figure 5 Figure 6 Figure 3 Figure 7 Figure 8 Figure 9 Figure =32=

Claims (1)

[Claims] It is equipped with a soft mud storage tank for settling and processing soft mud, a permeable strip that moves inside the soft mud storage tank and is rolled up to the outside, and a winding machine or drive pulley for the strip, and the above-mentioned Soft mud, characterized in that a soft mud removing means is provided outside the soft mud storage tank in the path of the strips in order to remove the soft mud that adheres to the strips as the strips move in the soft mud storage tank. Sedimentation treatment equipment.