JPS5858487B2 - Sludge treatment method - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sludge treatment method that efficiently and uniformly spreads sludge deposited in rivers, swamps, the seabed, etc. onto a landfill site, and at the same time generates the necessary soil bearing capacity. The purpose is to shorten the period required to complete the process.

Conventionally, when expanding a landfill site by pouring pumped mud into the site, as shown in Figure 1, a barrier 1 is built in advance and the inside is drained to form a landfill site 2. 2
A dredger4 removes sludge deposited in rivers, swamps, the seabed, etc.
The mud is pumped up and thrown in.

However, in this method, the dredged sludge 3 is poured into the landfill site 2 through the 11 sludge drainage pipe 5, so the pumped sludge 6 has no soil bearing capacity at all, and after the sludge is pumped, a wetland bulldozer enters the landfill site. However, it takes about two years after the paper drain machine is installed, and the cost of landfilling is therefore enormous.

The present invention has been made in view of these shortcomings, and proposes a mud lifting treatment method that can effectively perform landfilling and dramatically reduce the number of days required to develop the strength and bearing capacity of the soil compared to conventional methods. .

In carrying out the method of the present invention, a conveyor for lifting and transporting mud is used, which is placed in the landfill site after drainage.

In FIGS. 2 and 3, 7 is a fence, and 8 is a landfill site, and this landfill site 8 has already been drained.

Reference numeral 9 denotes a mixing tank provided on the dam 7, into which pumped mud containing dredged water and a pumped mud hardening agent are poured.

After mixing the two, the discharge conveyor 10 transports the slurry 11 that is in progress of solidification or has completed solidification to a hopper 13 at the starting end of the conveyance path X of the conveyor 12 arranged in the landfill site 8.
Send it through.

□The hardening agent injected into the kissing tank 9 includes cement,
A powder such as Chemicolime or a liquid such as sodium silicate can be used; in either case, the slurry coagulates while containing water.

As time passes and the coagulation progresses, in the former case it becomes solid in a water-containing state, and in the latter case it solidifies while separating water.

It has been found that the neutralization heat of sodium silicate also has a good effect on this solidification.

As described above, the pumped mud 11 which is in progress of solidifying or after solidifying is completed is sent to the conveyor 12.
During transportation, separated water resulting from the condensation is collected and discharged outside the landfill site.

For this purpose, a water receiving chute 14 is provided below the conveyor 12, and the separated water flows down within this chute 14, is sent back to the base of the guard 7, and passes through a water receiving groove 15 formed in the base. The waste is discharged to the outside of the landfill site 8.

Therefore, since separated water does not enter the landfill site 8, it can contribute to the solidification of the landfill site.

Note that when only the pumped mud after solidification is conveyed, no separated water is discharged, so there is no need to discharge the separated water.

The lifted mud conveyed by the conveyor 12 is sequentially introduced into the landfill site 8 from the conveyance route end portion 12D and intermediate portions P9Tl 2A, 12B, and 12C of the conveyor upon or after the completion of the solidification.

Therefore, after being charged, the pumped mud 11 is solidified.

As described above, the solidified lifted mud 11 is introduced and dispersed into the landfill site 8 along the conveyance route
1 evenly spread.

At the same time, another bulldozer 17 pulls the conveyor 12,
The third
Turn to the left or right as shown by arrows Y and Z in the figure.

Next, the solidified mud 11 is introduced and dispersed again by the conveyor 12,
After this is completed, the uniform diffusion is performed to expand the previous diffusion layer.

Such operations are repeated to uniformly spread the solidified mud to the landfill site 8 within the angle at which the conveyor 12 can rotate.

After the uniform diffusion within the turning angle is completed, the conveyor 1
2 to another location and repeat the same operation to expand the diffusion layer one by one.

In the above description, the case where the dispersion and uniform diffusion of the solidified slurry 11 are performed alternately is explained; however, the present invention is not limited to this, and the conveyor 12
The solidified slurry 11 may be dispersed during the rotation, and uniform diffusion may also be followed.

By the way, the conveyor 12 is a plurality of conveyors 20A to 20.
D (four in the example) are connected in series, and the spit water receiving chute 14 is also formed by connecting the chutes 21A to 21D attached to each type of conveyor 20A to 20D with pump-equipped pipes 22A to 22C. It is.

And various conveyors 20A to 20D and various chutes 2
1A to 21D are arranged so as to be inclined so that the terminal end of the conveyance path X is on the upper side.

Furthermore, each type of conveyor 20A to 20D has a chute 21 of each type.
It is supported on the landfill site 8 by a float type spud 23 along with A to 21D, and can be tilted up and down.

This will be explained with reference to FIGS. 4 to 6, taking the tip conveyor 20D as an example.

25 is a conveyor main body, and 26 is a water receptacle chute, which is attached along the longitudinal direction below the conveyor main body 25.

Reference numeral 27 denotes a float type spud in which a plurality of sets (three sets in the embodiment) are arranged at predetermined intervals in the longitudinal direction of the conveyor main body 25, and the spuds are connected to each other by a connecting member 28.

Pantograph mechanisms 29A to 29C are interposed between each set of spuds 27 and the conveyor main body 25, and horizontal links 30A to 30C of the pantograph mechanisms 29A to 29C are provided.
is connected to the conveyor body 25 via the brackets 31A to 31C.
It is pivoted to.

A pair of intersecting intermediate links of the pantograph mechanisms 29A to 29C pivotally connect their intermediate parts to each other, and one end of one intermediate link is pivotally connected to the horizontal links 30A to 30C, and the other end is connected to the connecting member 28. One end of the other intermediate link is pivoted on the connecting member 28, and the other end is movable via the trochanter on the lower surface of the horizontal links 30A to 30C.

When the hydraulic jacks 32A to 32C provided between the connecting member 28 and the intermediate pivot portions of the intermediate links are operated to raise and lower the horizontal links, the horizontal links move in parallel up and down, thereby adjusting the amount of elevation of each pantograph mechanism 29A to 29C mutually. When adjusted, the conveyor main body 25 can be tilted up and down as desired.

Reference numerals 33A and 33B are links for preventing deformation of the conveyor, which are composed of double links, and connect the horizontal links 30A to 30C.

34 is a movable chute attached to the tip of the conveyor body 25, and can be swung up and down by a cylinder device 35.

Furthermore, 36 is a platform having a handrail 37, and a worker can ride on this platform 36 to perform the work of dispersing the coagulated mud.

In Fig. 7, swing links 39A and 39B are used instead of the pantograph mechanism shown in Figs. 4 and 5, and since the operation thereof is obvious without even a casing to be explained, the details are omitted. do.

Furthermore, although not shown, various devices such as a screw jack type, a rack and pinion type, etc. can be employed as a device for imparting elevation and tilting of the conveyor main body.

As mentioned above, in short, the present invention provides for the following:
A conveyor is installed to transport the mud, and 1 area containing dredged water is installed.
A hardening agent is injected into the pumped mud of step 1 to solidify the pumped mud, and while this solidification is progressing, the pumped mud is conveyed by the conveyor, and the separated water is collected and discharged outside the landfill site. Upon completion or after completion, the conveyor is rotated from side to side while sequentially introducing the solidified mud into the landfill site from the end of the conveyance path of the conveyor and from a midway point, thereby uniformly dispersing the solidified mud into the landfill site. It is.

Therefore, most of the mud-containing water lifted during dredging will be discharged outside the landfill site as separated water due to coagulation, and only a small amount of residual water will enter the landfill site, which will result in faster solidification. Therefore, the bearing capacity of the soil can be improved at an early stage.

And this effect is enormous when converted into the cost required for landfilling.

Further, the above effect can be further promoted by uniform diffusion of the solidified slurry after dispersion into the landfill site.

Furthermore, in the present invention, the conveyor for transporting sludge is supported on the landfill ground by a float type spud, and this conveyor can be tilted up and down, so the installation height and angle of inclination of this conveyor can be freely adjusted to the optimum condition. This makes it possible to carry out the lifting work on the conveyor efficiently.

[Brief explanation of drawings]

Fig. 1 is a longitudinal side view showing the conventional processing method, Fig. 2 is a longitudinal side view showing the processing method of the present invention, Fig. 3 is a plan view of the same, and Fig. 4 is a schematic side view showing an enlarged short conveyor. , FIG. 5 is a front view of the same, FIG. 6 is an enlarged plan view of the essential parts, and FIG. 7 is a schematic side view showing a modification of the short conveyor 20D. 8... Landfill site, 9... Mixing tank, 11... Lifting mud, 12... Conveyor,
14...Water receiving chute, 15...Water receiving groove, X...Transport route.

Claims (1)

[Claims] 1. A conveyor for transporting mud is supported on the reclaimed ground by a float spud in the reclaimed land after drainage, and the conveyor is movable up and down, so that the mud of Sprout 1 containing dredged water is transported. A curing agent is injected to solidify the lifted mud, and while this solidification is in progress, the lifted mud is conveyed by the conveyor, separated water is collected and discharged outside the landfill site, and upon or after the completion of the solidification. The pumping method is characterized in that the conveyor is rotated from side to side while the solidified mud is sequentially introduced into the landfill site from the end of the conveyance path of the conveyor and from a midway point, so that the solidified mud is uniformly spread over the landfill site. Mud treatment method.