JPS5854207B2 - Sludge treatment method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sludge treatment method.

Conventionally, sludge, such as sludge with a high water content, has been treated using methods such as mechanical dewatering and cement solidification, but these methods take a long time to process and prevent secondary pollution when reused in landfills. It was not satisfactory in these respects.

Therefore, recently, after adding a coagulant to the sludge, the sludge is put into a concentration tank and concentrated, and the concentrated sludge is taken out and a coagulant (for example, a silicate coagulant such as a water glass coagulant) is added and mixed. A method has been considered in which a hardening agent (for example, a silicate hardening agent such as an acid or an oxidizing substance) is added to this concentrated sludge and then mixed, and the sludge with the hardening agent added is then disposed of in a landfill or the like.

In such a method, it is very important for sludge treatment to immediately dehydrate and dry the sludge mixed with a solidifying agent after dumping it to improve the ground.

However, during the winter and rainy seasons when there is a lot of rainfall, it is difficult for the dumping to dry out due to the sun, and rapid ground improvement cannot be expected.

In order to solve this problem, it is conceivable to increase the amount of solidifying agent added to the sludge, but using a large amount of expensive solidifying agent is economically disadvantageous.

Therefore, the present invention provides a sludge treatment method capable of solving the above-mentioned problems, and one embodiment thereof will be described below with reference to FIGS. 1 to 6.

As shown in FIG. 1, a dumping site 1 is divided by a dam 2.

Sludge to which a permanent solidifying agent has been added is dumped onto this dumping site 1, thereby forming a sludge layer 3 of a predetermined thickness.

Next, as shown in FIG. 2, a sludge solidified layer 4 containing a large amount of solidifying agent is laminated on top of this sludge layer 3.

This sludge solidified layer 4 has a funnel-like shape and is laminated to a predetermined thickness.

Then, as shown in FIGS. 3 and 4, a particle layer 5 is laminated on the sludge solidified layer 4.

This particle layer 5 is formed by arranging a large number of water drainage materials 8, which are formed by putting particles 7 into a water-permeable bag 6, on the sludge solidified layer 5, as shown in FIG.

The water permeable bag 6 is made of vinyl or other cloth,
It is particularly effective to use a filter cloth or the like.

Further, as the particles 7, sand or aggregate is used.

By stacking the particle layers 5 as shown in FIGS. 3 and 4, the weight of the particles T presses the sludge layer 3 through the sludge solidified layer 4, and as a result, the moisture in the snake layer 3 is released. It oozes upward through the solidified layer 4, passes through the water-permeable bag 6, enters the particles 7, and is guided outside through the particles 7.

By performing dehydration in this way, the volume of the sludge layer 3 is reduced, and as shown in FIG.
By mounding with soil, a high-quality and strong foundation can be obtained.

As shown in FIG. 7, the sludge layer 3 is further laminated on top of the strong ground, and the same method as described above is carried out to perform an additional layering process.

In this case, the dam 2 is formed high in advance or is raised one after another, and the drain pipe 11 from the drain pump 10 installed on the dam 2 is connected to the dam 2.
You can also actively dehydrate the water by inserting it into the water.

In addition, when carrying out additional piling, the middle quality soil 9 may be unnecessary depending on the case.

The drainage material 8 may have a round cross section as shown in FIG. 4, or may have a rectangular shape as shown in FIG. As shown in FIG. 9, particles 7 may be directly supplied onto the sludge solidified layer 4 to form a particle layer 5.

In each example, not all of the water enters the particles γ due to the weight on the particle layer 5 side, but a portion of the water flows into the dam 2 and the like.

Furthermore, although we have mentioned sludge, it can also be applied to the treatment of sludge and sludge.

According to the present invention described in the above embodiments, a sludge solidified layer to which a large amount of a solidifying agent has been added is laminated on a sludge layer in which a solidifying agent is permanently added and discarded, and a particle layer is further laminated on top of the sludge solidified layer. Since the weight of this particle layer removes the moisture in the sludge, the sludge layer that has been dumped can be quickly dehydrated and dried to improve the ground into a strong foundation, regardless of whether it is winter or the rainy season. This makes it cheaper and more economically advantageous than adding a large amount of solidifying agent to all of the sludge, and the sludge solidified layer prevents the particle layer from moving toward the sludge layer. Dehydration by pressing,
This can be done almost uniformly and reliably over the entire surface.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention, FIG. 1 is a front view showing a sludge layer formation state, FIG. 2 is a front view showing a sludge solidified layer stacked state, and FIG. 3 is a particle Figure 4 is a front view showing the layered state, Figure 4 is a side view of the main parts, Figure 5 is a partially cutaway front view of the drainage material, Figure 6 is a front view showing the soil mound state, Figures 7 to 9. 7 and 9 are front views, and FIG. 8 is a side view of the main parts. 1...Dumping site, 2...Weir, 3...
... Sludge layer, 4... Sludge solidified layer, 5...
...Particle layer, 6...Water permeable bag, 7...
... Particles, 8 ... Drainage material, 9 ... Good quality soil, 10 ... Drainage pump, 11 ...
water drain pipe.

Claims (1)

[Claims] 1. A sludge solidified layer with a large amount of solidifying agent added is layered on top of the sludge layer that has been dumped with a solidifying agent permanently added thereto, and a particle layer is further layered on top of that, and the weight of this particle layer absorbs the moisture in the sludge. A sludge treatment method characterized by removing.