JPS5823158B2 - Manufacturing method for backfilling material using cake produced at water treatment plants - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing backfilling material that utilizes cake generated in large quantities at water purification plants. The aim is to provide a method for effectively utilizing the

Conventionally, the cake generated at water treatment plants has been disposed of in a designated area in a landfill, but as the urban population increases, the amount of cake generated increases and disposal sites become increasingly scarce, making its disposal an important issue.

The present invention was completed as a result of intensive research in view of the current situation, and it is designed to make it possible to effectively utilize cake as a backfilling material.

According to the present invention, the cake generated at the water treatment plant can be used as is without using a particularly large-scale plant or thermal energy, and some of the remaining soil can be reused as backfilling material. This method is not only meaningful in terms of disposal of residual soil, but also extremely economical as it eliminates the need to purchase mountain sand.

That is, the gist of the present invention is to add 3 to 7 parts of residual soil to 10 parts of cake generated at a water purification plant, mix thoroughly with a mixer that rotates on its axis and revolves at the same time, and then mix the mixture into 10 parts.
Using a water treatment plant generated cake, which is characterized by adding 0.5 to 1 part of a treatment agent made by blending a small amount of calcium chloride with blast furnace cement to 0 part, mixing it, and then curing it for at least 1 day. This is a manufacturing method for backfilling material.

In the present invention, the amount of residual soil to be added to 10 parts of cake varies somewhat depending on the nature of the residual soil, but is usually selected within the range of 3 to 7 parts, and is generally preferably about 5 parts.

As will be described later, for this mixing, it is necessary to use a mixer that rotates and revolves at the same time.

In addition, the amount of treatment agent added can be adjusted depending on the amount of remaining soil used.
When the amount of residual soil is relatively small, 5 parts should be added, but in order to obtain an agglomerated product that can be backfilled, it is important to use the amount in the range of 0.5 to 1 part.

In addition, a small amount of treatment agent is added to the blast furnace cement, for example, 3~], 0
%, preferably about 5%, is used, and as a result of various experiments, it has been found that such a processing agent, in combination with the mixing operation of the present invention, is effective in agglomerating the cake and residual soil mixture. It was found to work extremely effectively.

Note that although types of cement other than blast furnace cement can be used, if the corrosion resistance and latent hydraulic properties of cement are taken into consideration, blast furnace cement is most suitable for achieving the purpose of the present invention.

However, as mentioned above, the process of mixing the treatment agent with the cake and the remaining soil is carried out by a mixer that rotates and revolves at the same time, so that the cake is sufficiently crushed and the treatment agent acts on the mixer, resulting in what is called a crosstalk condition. Improved soil is dispersed uniformly and aggregated.

This effect could only be achieved by using the above-mentioned formulation and by operating a mixer that rotates on its axis and revolves at the same time.

The mixture of cake and residual soil mixed with the treatment agent is cured for more than 24 hours.

This can be done outdoors or indoors.

The cake treated in this way can be used as a backfill material in the same way as conventional mountain sand.

Example 1゜ First, cake 0.5m' from water treatment plant and remaining soil (Kanto loam) 0
．． 5m” into a mixer that rotates and revolves at the same time for about 5 minutes.
After mixing for 1 minute, a processing agent was then added to the mixture for 100:9 and then mixed for about 5 minutes to ensure good dispersion.

Thereafter, the material was cured for 3 days to obtain a backfill material of the present invention.

The above treatment agent was obtained by adding 5 kg of calcium chloride to 95 kg of blast furnace cement B.

The mixer has a capacity of 1m" and a revolution speed of 22 rpm.

One with an autorotation speed of 74 rpm was used.

The cake obtained by the treatment has a specific gravity of 2.78: water content ratio
19.56: wet density 1.29.9/m”, CBR1
2.40I), and was sufficiently usable as a backfilling material.

Examples 2 and 3 Water treatment plant cake 0.7 m, residual soil 0.3 m”, treatment agent 1
00kg (95kg of blast furnace cement, 5k of calcium chloride
Table 1 shows the soil test results obtained by mixing g) for 5 minutes and curing for 3 days in the same manner as in the above example.

Note that Examples 2 and 3 have different sampling ports for the material cake.

Note) 1) Drying time 6 hours 20-30 minutes 2) 2.5mm penetration 3) 5.0mm penetration 4) Immersion period 4 days In addition, Example! The properties of the untreated cake used in , 2.3 are as shown in Table 2.

Claims (1)

[Claims] 1 Add 3 to 7 parts of residual soil to 10 parts of the cake generated at the water treatment plant, mix thoroughly using a mixer that rotates and revolves at the same time, and then add a small amount of calcium chloride to blast furnace cement to 10 parts of the mixture. After adding 0.5 to 1 part of a processing agent made of
A method for manufacturing backfill material using a cake produced at a water treatment plant, which is characterized by being cured for days.