JPH02221150A - Water purifying material and its production - Google Patents

Abstract

PURPOSE:To obtain a water purifying material optimum for the living of microorganisms and to efficiently purify the water of small-to-medium-sized rivers, lakes and marshes, the water in water tanks in an aquarium, etc., by using an inorg. material such as topsoil, liverite, shale or an ettringite product and an org. binder as essential components. CONSTITUTION:100 pts.wt. one or more kinds of inorg. materials selected among topsoil (aluminous silicate hydrate present on the surface of the earth'crust, liverite (natural fine aluminous silicate-based earthy mixture), shale (laminar solidified clay) and an ettringite product such as 3CaO.Al2O3.3CaSO4.32H2O are mixed with <=20 pts.wt. org. binder such as PVA and water. This mixture is granulated and calcined at a high temp. of >=1,000 deg.C to obtain a water purifying material having 3-30mm grain size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a water purification material using the water purification material.

[Conventional technology and its discussion]

Conventionally, the method of purifying sewage has been to pour the sewage into a septic tank filled with cobblestones, and have the microorganisms that live on the surface of the cobblestones consume the filth, carbohydrates, lipids, and proteins in the sewage to purify it. Ta.

However, in recent years, as dams have been constructed upstream of rivers, there is a shortage of cobblestones of suitable particle size and shape as water purification materials in downstream riverbeds. In addition, collecting cobblestones from riverbeds was prohibited.

For these reasons, it is currently difficult to install large-scale septic tanks using cobblestones. In order to compensate for this shortage of cobblestone, methods have been proposed such as using crushed granite or tuff instead of cobblestone, and using crushed blast furnace slag (technical data, 1988 Shu Kosan).
(Issued by).

However, since natural crushed stone and blast furnace slag crushed stone have excessive irregularities compared to cobblestone, microorganisms can easily adhere to them. A problem with this problem is that it is not removed and tends to accumulate on the surface, causing clogging in a short period of time, making it impossible to achieve the purpose of purification.

The present inventors have completed the present invention based on the knowledge that a water purification material most suitable for microorganisms to live in can be obtained by using a specific material.

[Means to solve the charge]

That is, the present invention is a water purification material whose main components are one or more inorganic substances selected from the group consisting of topsoil, lipalite, shale, and ethrine products, and an organic binder; This is a method for producing a water purification material using.

The present invention will be explained in detail below.

In the present invention, the inorganic substance is one or more selected from the group consisting of topsoil, lipalite, shale, and ethlinite products.

The topsoil used in the present invention is a hydrated alumina silicate that exists on the surface of the earth's crust or in a relatively shallow part.

Moreover, lipalite is a raw mixture whose main component is naturally occurring fine alumina silicate.

In addition, true rock is clay that has solidified into layers and has a foaming effect.

Furthermore, ettringite nuisances are those that produce ettrin and ettringite, such as 3CaO'
Examples include AJ203"3CaSOa"32H20, various cements, Ceracola, limes, and alumina raw materials.

The particle size of the inorganic material is preferably 300 μm or less. If it exceeds 300μ, it becomes difficult to control the shape of the water purification material (hereinafter referred to as the purification material) during granulation.

The organic binder used in the present invention refers to poval, methylcellulose, starch, protein, fat, nucleic acid, etc., and among these, one or more can be used.

It is preferable that the organic binder should be used in a range of 2ON or less per 100 parts of the inorganic material. By changing the usage area of the organic binder, it is possible to excessively control the porosity, ratio N, etc. of the purification material produced by granulation and firing, but it becomes difficult to control this when used in excess of 20 m/t. Prone. If the porosity is large, the specific gravity will decrease and the purification effect will increase.

A water purification material (hereinafter referred to as purification material) containing the above-mentioned inorganic substance and organic binder as main components is mixed with water and granulated.

The amount of water used is 100% of the total amount of inorganic and organic binders.
The amount is preferably 401 parts by weight or less. If the weight exceeds 40, granulation tends to become difficult.The granulation conditions Vi are not particularly limited (・) Granules are usually granulated using a pan-type granulator, high-speed mixer, etc., and then baked.

Firing is usually performed at a high temperature of 1.00000°C or higher using an electric furnace, kiln, or the like.

The size of the granulated and fired purifying material is preferably 6 to 60 mm in diameter. If it is less than 3 cranes, the flowability of purified water will deteriorate and the water will reach 60
If you exceed the level of inebriation, your purifying ability tends to decline.

In addition, making the shape of the purification material as true spherical as possible and increasing its area will improve the purification ability.If the purification material manufactured as described above is used in place of the conventional boulders and a septic tank is built, the sewage When cleaning, the adhesion of microorganisms becomes better,
Not only does the purification speed increase and purification efficiency improve, but when cleaning the purification material, the specific gravity of the purification material is 0.9 to 1.1, which is smaller than the specific gravity of cobblestone, which is 1.5 to 2.0. , due to the floating movement caused by the washing water and the interaction between the purifying materials, the sludge attached to the surface of the purifying materials is easily removed. can be used.

Purification material of the present invention Vi1. Since it is a ceramic material fired at the same temperature of OOO'C or higher, it is extremely hard and durable, and the purifying material can be washed many times. In addition, there is no leaching of harmful substances, and since it is uniform, the filling is appropriate, and the passage of purified water flows evenly over the entire area, and does not cause @9. Therefore, since the effective contact area is larger than that of natural cobblestone or crushed stone, the septic tank is less expensive and more economical.

〔Example〕 Hereinafter, the present invention will be further illustrated with reference to Examples.

Example 1 As an inorganic substance, a site from Mt.
1 tB, and Denka Kagaku Kogyo Co., Ltd.'s Poval product name [Denka Poval 17SBJ2.51] as an organic binder.
1 m part was mixed. To this mixture, granules were made by adding 201 [(Ji part) of water to 11 parts of topsoil to form a spherical body, which was then fired in an electric furnace at a temperature of 1,300°C for 1 hour to purify 5 to 105 m. It was used as a material.

The purifying material 3 is placed over the slit 2 in the experimental septic tank 1 of 50 x 50 x 100 (σ) shown in Figure 1 with a porosity of approximately 20.
It was filled to a volume of t%. B, O, D from 1t4 of sewage installed at the top of purification 11.

(Biochemical oxygen demand*) 35 W/l and S, S.

(Floating solids) Sewage containing 50w/l (20'c
) was introduced at a flow rate of 0.8 to 8.01/min, compressed air was blown in from the air pipe 5 at a rate of 181/min, and purified water was discharged from the drain pipe 6. Note that the purification material used was one in which microorganisms in wastewater were scaffolded in advance. Clean water was introduced from the septic tank 7 installed at the bottom of the septic tank 1 to clean the narrow side of the purification material.A similar experiment was conducted using crushed granite and cobblestone instead of the purification material. .

The results are shown in Cloth-1 and Table-2.

As a result of the above, B, O
It can be seen that the removal rate of . It can be seen that the removal rate is almost 100% when the residence time is 2 hours, which is about 1.3 times better than crushed stone or cobblestone.

Example 2 The same procedure as in Example 9'l11 was carried out except that the inorganic substance shown in Cloth-6 was used. The result is Cloth-4 and Cloth-5
Shown below.

Mr.-6 Effect of the invention〕 Use of the purifying material of the present invention provides the following effects.

) Since it is made of ceramic fired at a high temperature of 1,000°C or higher, it is extremely hard and durable, and the cleaning material can be washed repeatedly.

) Since it is uniform, the purified water flows evenly over the entire area and does not cause any negative flow.

) The effective contact area is large, and the septic tank can be made smaller accordingly, making it economical.

) B, O, D, removal rate, S, S, removal rate can be significantly increased.

Brief description of the surface Figure 1 is a sectional view of the septic tank.

No. 1...Septic tank, 2...Slit, 3...
・Purification material, 4... Sewage pipe, 5... Air pipe, 6... Drain pipe, T... Fresh water introduction pipe.

Patent applicant: Denki Kagaku Kojo Co., Ltd.

Claims (2)

[Claims] (1) A water purification material whose main components are one or more inorganic substances selected from the group consisting of topsoil, lipalite, shale, and ethrine-based products, and an organic binder. (2) A method for producing a water purification material, which comprises mixing the water purification material according to claim 1 with water, granulating it, and firing it.