JPS5854206B2 - 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 flocculant to the sludge, the sludge is put into a concentration tank to be concentrated, and the concentrated sludge is taken out and a coagulant (for example, a sulfate-based coagulant such as a water glass-based coagulant) is added and then mixed. A method has been considered in which a hardening agent (for example, a sulfate 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 ground improvement by sludge treatment to quickly dehydrate the sludge mixed with a solidifying agent and then make the ground strong.

Therefore, the present invention provides a method for treating sludge that can quickly dehydrate dumped sludge, and one embodiment thereof will be described below with reference to FIGS. 1 to 5.

First, as shown in FIG. 1, a large number of drainage materials 3 formed by placing particles 2 in a water-permeable bag 1 are prepared.

The water-permeable bag 1 is made of vinyl or other cloth, and it is particularly effective to use filter cloth.

Further, as the particles 2, sand or aggregate is used.

Note that 4 indicates a water drain port.

As shown in FIG. 2, the dumping ground 5 is formed by a dam 6.

The sludge to which a solidifying agent has been added is dumped onto this dumping site 5, thereby forming a sludge layer 7 of a predetermined thickness.

Next, as shown in FIGS. 3 and 4, the water drainage material 3 is arranged on the sludge layer 7.

Then, the weight of the particles 2 presses the sludge layer T, and the water that oozes upward passes through the water-permeable bag 1 and enters the particles 2, and then is guided outside through the particles 2.

After dehydration is performed in this way (at this time, the volume of the sludge layer becomes lower).

), as shown in FIG. 5, by mounding high-quality soil 8 on top of the three layers of drainage material, a high-quality and strong foundation can be obtained.

As shown in FIG. 6, additional accumulation can be carried out by forming a strong foundation, dumping sludge, and performing the same method as described above.

In this case, the dam 6 is formed high in advance or is raised one after another, and the drain pipe 10 from the drain pump 9 installed on the dam 6 is inserted into the dam 6. Dehydration may be actively carried out.

If the dumping site 5 is long, a plurality of drainage materials 3 may be connected in a straight line as shown in FIG.

Further, the drainage material 3 may have a round cross section as shown in FIG. 4, or may have a rectangular cross section as shown in FIG.

In each embodiment, not all of the moisture enters the particles 2 due to the weight of the drainage material 3, but a portion of the moisture flows into the dam 6 and the like.

Although I mentioned this in detail about Heto River, it can also be applied to the treatment of sludge and sludge.

According to the present invention described in the above embodiments, a drainage material formed by putting particles in a water-permeable bag is arranged on the sludge layer which has been added with a solidifying agent and discarded, and the water in the sludge is removed by the weight of the drainage material. Therefore, the dumped sludge can be quickly dehydrated to create a strong foundation, and since the drainage material is easy to handle, the sludge can be quickly prepared for dehydration after being dumped.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention. Figure 1 is a partially cutaway front view of the drainage material, Figure 2 is a front view showing the sludge dumping state, and Figure 3 is the arrangement of the drainage materials. 4 is a side view of the same essential parts, FIG. 5 is a front view showing the soil mound state, FIGS. 6 and 7 are front views showing different embodiments, and FIG. 8 FIG. 7 is a side view of main parts showing another embodiment. 1... Water permeable bag, 2... Particles, 3...
...Drainage material, 4...Drainage port, 5...
... Dumping site, 6... Dam, 7... Sludge layer, 8... Good quality soil, 9... Drainage pump, 10...・Drainage pipe.

Claims (1)

[Claims] 1. A sludge treatment method characterized by arranging a drainage material formed by placing particles in a water-permeable bag on a layer of sludge that has been dumped with a solidifying agent added thereto, and removing water from the sludge with the weight of the drainage material.