JP2001219151A - Waste ash sealing block body and fishing bank using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To seal dioxins and heavy metals in waste ash effectively. SOLUTION: A mixture comprising materials ejected from a volcano such as natural black clay and volcanic ash and waste ash is solidified with cement. Since humus colloid in the natural black clay is charged negatively, the cations of heavy metals, or the like, in a block body are adsorbed/held on/with collodial particles. Allophane is amphoteric colloid and adsorbs/holds cations and anions, porous volcanic pebbles, volcanic sand, and volcanic ash adsorb/hold harmful substances such as dioxins and PCB in their pores, and since the harmful substances are sealed by cement, the substances are confined strongly to be prevented form being diffused outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed block of waste ash and a reef using the same.

[0002]

2. Description of the Related Art In recent years, dioxin generated when waste is incinerated has become a problem, and treatment of incineration ash (waste ash) containing this dioxin has also become a problem. For this reason, efforts have been made to elaborate the structure of the incinerator and to completely burn the waste as much as possible.
It is difficult to completely prevent the generation of dioxin.

Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a waste ash sealing block capable of effectively containing dioxins and heavy metals in waste ash. And providing reefs using the same.

[0004]

The present invention has the following arrangement to achieve the above object. That is, the sealed waste ash block according to the present invention is characterized in that a mixture of natural black clay, volcanic ash such as volcanic ash, and waste ash is solidified into a block with cement.

It is preferable to use lapilli, volcanic sand and ash as the volcanic ejecta. The mixing ratio of natural black clay is 20 to 40 parts, lapilli 10 to 20 parts, volcanic sand 10 to 20 parts, volcanic ash 10 to 20 parts, waste ash 20 to 40 parts, cement is 20 to 30 parts is preferable in terms of strength. These block bodies are suitable for use as various structures that do not require much strength or as fishing reefs.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail. As described above, the waste ash sealed block according to the present invention is obtained by solidifying a mixture of natural black clay, volcanic ash and other volcanic eruption products and waste ash in a block shape with cement. Waste includes industrial waste such as industry, agriculture, fisheries, and forestry, and general waste such as household waste.Therefore, various types of heavy metals and dioxins are mixed in the incinerated waste ash. Sometimes.

[0007] Natural black clay is widely deposited and distributed in Japan, which is a volcanic country, and can be easily collected and obtained. The surface layer of volcanic ash soil, a weathering product derived from volcanic ash deposits, is composed mainly of allophane, an amorphous (amorphous) clay mineral, which contains a large amount of humus (humic acid group and fulvic acid group). Black soil, generally "dark soil",
It is called "dark sound area". This is referred to herein as natural black clay.

[0008] This natural black clay has various physicochemical absorption and adsorption characteristics of the allophane clay mineral and the humic substances that constitute it, and is effective against various kinds of substances (ions and compounds). The behavior of absorption, adsorption, exchange, buffer action, etc., has been elucidated by pedological studies.

However, the natural black clay rarely attempts to use the above-mentioned special behavior or properties for any purpose in fields other than soil science (agricultural soil). Rather, this natural black clay absorbs and decomposes fertilizers and the like, and is said to be unsuitable for agricultural crops. In the present invention, the natural black clay is effectively used.

[0010] Volcanic debris, volcanic sand and volcanic ash are easily available in Japan, which is also a volcanic country. In general, volcanic gravels have a particle size of 10 mm to 40 mm, volcanic sand has a particle size of 4 mm to less than 10 mm, and volcanic ash has a particle size of less than 4 mm.

The above natural black clay, volcanic rubble, volcanic sand, and volcanic ash are mixed, and the mixture is solidified into a block with cement. These mixing ratios are generally as follows. That is, by weight, 20 to 40 parts of natural black clay,
10-20 parts of volcanic rubble, 10-20 parts of volcanic sand, 10-20 parts of volcanic ash, 20-40 parts of waste ash, and 20-30 parts of cement.

The proportions of these components may be changed according to the strength required for the block. Some lapilli and volcanic sand also function as aggregate. Therefore, the strength increases as the mixing ratio of cement and these aggregates increases. By adjusting the breaking strength to be 100 kg to 150 kg, the block can be used as various structures or as a reef.

In the present invention, the natural black clay uses a natural product itself. Since no processing is required, cost can be reduced. As described above, natural black clay is a black soil containing allophane as a main component and a large amount of humus (humic acid group and fulvic acid group).

When natural black clay is subjected to a treatment such as drying by heating, corrosion is decomposed. However, if natural products are used as they are, a large amount of humus is mixed in the block. This humus plays a large role in the block. That is, humus is a mixture of various kinds of organic substances such as humic acid group, fulvic acid group, etc., and has a weight average molecular weight of about tens of thousands of amorphous macromolecules, the shape of which is approximately spherical with a radius of 60 to 100 mm. It is a substance close to.

The humic colloids are also negatively charged as a whole, and it is believed that they are largely caused by the dissociation of carboxyl, amino and hydroxyl groups. Since the humic colloid is negatively charged, cations such as heavy metals in the block are adsorbed and retained on the colloid particles. Allophane is an amphoteric colloid and adsorbs and retains cations and anions.

Further, in the block body, lapilli, volcanic sand,
Volcanic ash is a porous substance. Although these also function as aggregates as described above, harmful substances such as dioxin and PCB are adsorbed and held in their fine pores, and since these are sealed with cement, these harmful substances are firmly fixed. To prevent escape to the outside. As described above, the block body according to the present invention has an effect of confining harmful substances such as heavy metals, dioxins, and PCBs in the waste ash by the integrated function of the natural black clay and the volcanic ejecta.

Also, lapilli, volcanic sand and ash have been in use for tens of thousands of years.
It is an inorganic substance that has been erupted by volcanoes for thousands of years. Since it contains 70 to 73% of silicon and 10 to 13% of alumina, the pH of the outer surface of the block is always kept near neutral. I have. Therefore, it can be suitably used as a reef. By forming a tetrapod (trade name) -shaped block and arranging it in a state of being combined in seawater to form a fishing reef, the flow of seawater can be relaxed and the temperature of seawater can be kept relatively constant. , Creating an environment where bacteria and other microorganisms can easily propagate around the reef,
Small fish gather, and small fish are eaten by medium fish. In other words, large fish are gathered to eat this middle fish, so that a natural environment cycle can be fostered.

[Cylinder Experiment] The above-mentioned block formed in a small block shape was placed in a packed tower made of a transparent acrylic cylinder having a diameter of 300 mm and a height of 1300 mm to a thickness of 50 mm.
After filling to 0 mm, the packed tower is filled with seawater and left for 30 days, and various data are shown below. Permeability pH Suspended material BOD COD Total N Total p Initial 20 6.6 23.0 14.6 9.0 4.4 0.1 Day 30 65.6 6.9 7.8 4.6 6.5 0.64 0. 09 The unit of transparency is cm.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above, and can be appropriately modified without departing from the spirit of the invention.

[0020]

As described above, according to the present invention, since the humic colloid in natural black clay is negatively charged, cations such as heavy metals in the block are adsorbed and retained on the colloid particles. Allophane is an amphoteric colloid, which adsorbs and holds cations and anions, and porous lapilli, volcanic sand, and volcanic ash adsorb and hold harmful substances such as dioxin and PCB in their fine pores. In addition, since these are sealed with cement, there is a remarkable effect that these harmful substances can be firmly confined and escape to the outside can be prevented.

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Claims (4)

[Claims] An industrial waste ash sealed block comprising a mixture of natural black clay, volcanic eruption products such as volcanic ash, and waste ash cemented with cement. 2. The waste ash-sealed block body according to claim 1, wherein the volcanic eruption material includes lapilli, volcanic sand and volcanic ash. 3. 20 to 40 parts of natural black clay, 10 to 20 parts of lapilli, 10 to 20 parts of volcanic sand, 10 to 10 parts of ash
20 parts, waste ash 20-40 parts, cement 20-3
The waste ash-sealed block body according to claim 2, wherein 0 parts are blended. 4. A fishing reef comprising the block according to claim 1, 2 or 3.