JPH0557287A - Sewerage system - Google Patents

Abstract

PURPOSE:To inexpensively realize a non-polluting sewerage system wherein the microbes such as mildew, bacteria and algae, a black gelatin-like material in Japanese popularly called 'Numenume', and iron rust are not generated or propagated. CONSTITUTION:The metallic ions of silver, copper, zinc, etc., having antibacterial action are used as a disinfectant. Calcium carbonate, calcium phosphate, ceramics, etc., are used as a carrier, the whisker of single-crystal zinc oxide having a tetrapod three-dimensional structure is mixed with the carrier to form an antibacterial and rust-inhibiting agent, and the agent is provided in a concrete pipe 31 for sewage as the inner layer 23 to constitute a sewerage system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage system and drainage system for sewage systems, particularly industrial water and domestic water.

[0002]

[Prior Art] Industrial drainage from factories, drainage from public facilities such as schools, department stores, hospitals, condominiums, domestic household water, etc.
Often made of plastics or concrete, such as sewers. Most of them are wastewater treatment channels containing organic substances, detergents, etc., so microorganisms such as bacteria, molds, algae, and commonly called black agar substances called Noumenum attach to them, and sewer lids are often made of iron. Therefore, iron rust adheres,
It is extremely unsanitary and unclean, and is regarded as a major social problem both in terms of hygiene and appearance. This tendency becomes more serious year by year, and environmental pollution caused by sewage is taken up as a major issue to be solved not only in Japan but globally.

[0003]

Problems of the conventional sewage equipment to be solved by the present invention include sewage gutters, basins, earth pipes,
Public sewage facilities such as sewers and rivers into which sewage flows, and private sewage facilities are attached to microorganisms such as bacteria, mold, algae, agar substances and iron rust.

It is an object of the present invention to realize a sewage system that solves the above conventional problems.

[0005]

In order to achieve the above-mentioned object, the present invention refers to antibacterial performance (hereinafter, the function of inhibiting or suppressing the growth of microorganisms such as bacteria, mold and algae is referred to as antibacterial performance). It is also used in drinking water purifiers, etc., and is selected from the group consisting of silver, copper, and zinc, which is known to be pollution-free. 1
One or more metal ions as a main component, and one or more supported substances selected from the group consisting of calcium carbonate, calcium phosphate, and inorganic ceramic materials, which are generally used as pollution-free substances, as the main component. An antibacterial and rust preventive agent prepared by adsorbing and supporting the carrier on a single crystal tetrapot-shaped three-dimensional zinc oxide whisker is installed in the sewer, and applied or mixed in the sewer structure. The sewage system is configured by equipping it in such a form.

[0006]

The present invention is generally pollution-free due to the above constitution.
, Which is also used in drinking water purifiers, copper ions,
Or use zinc ion as an antibacterial substance with antibacterial performance
As a substance that adsorbs and supports this, calcium carbonate,
Calcium acid (naturally as hydroxyapatite
Ca _Ten (PO _Four ) ₆ (OH) ₂ Phosphate represented by the chemical formula
Minerals), ceramic materials (naturally acid clay, Dosen)
It is a non-polluting substance such as a ceramic material near the side)
Uses a material that easily occupies an area, and is also water-insoluble and pollution-free
An acid with a three-dimensional structure in the form of a single crystal tetrapot as a substance
Equipped with antibacterial and rust preventive agent containing zinc oxide whiskers
Since it is sewage equipment, it constitutes the sewage equipment according to the present invention.
Drainage pipes, pits, earth pipes, sewers, etc.
Prevents adhesion of microorganisms, agar and iron rust, or
Sewage equipment that is restrained and extremely hygienic and clean compared to conventional
It will be.

Notable features of the present invention are, in addition to the above-mentioned effects, (1) Other crystals that grow in four directions because the zinc oxide whiskers to be blended are in a single crystal tetrapot shape. Since it has a unique shape that does not exist, it has strong activity and stability and remarkably increases the antibacterial performance of silver ion, copper ion, zinc ion and the like. Therefore, not only the antibacterial and anticorrosive properties of the antibacterial and anticorrosive agents are high, but the content of expensive silver or copper is one digit to two or more than the conventional antibacterial agents
Since the number of digits can be reduced, the sewage system can be equipped with an extremely inexpensive antibacterial / rust preventive agent. (2) The adsorption carrier is a commonly used non-polluting substance such as calcium carbonate, calcium phosphate, and ceramics and is inexpensive, and besides that, silver nitrate AgNO ₃ , copper sulfate CuSO ₄ , zinc sulfate ZnSO ₄
When such a water-soluble metal salt solution as described above is used, it is a simple one that can be adsorbed and supported by simply immersing the support in these solutions. Each of them can obtain a sufficiently large specific surface area, and in particular, hydroxyapatite is insoluble in water and is suitable for use in sewage equipment.

[0008]

EXAMPLES Examples of the sewage system of the present invention will be described in detail below with reference to the drawings.

(Example 1) In FIG. 1, reference numeral 1 denotes a concrete sewage basin having a lid 2, and a water-permeable housing 4 containing an antibacterial / rust preventive agent 3 is installed at the bottom. ..

The antibacterial / rust preventive agent 3 in this embodiment is in the form of pellets and is manufactured as follows. That is, 1 gram of silver was dissolved in 120 grams of 5% nitric acid solution to make a silver nitrate solution, water was added to make 1 liter of a water-soluble metal salt solution, and 8.5% aqueous ammonia solution was added to the complex ionized silver nitrate. A complex ion solution is prepared and the particle size is 0.5μ in a container equipped with a high temperature oil circulation tank that can be heated and cooled.
m, specific surface area of 40 m ² / g, 10 kg of hydroxyapatite with a pH of 7.0 and water suspension pH of 110 ° C.
, And sufficiently adsorb and support while stirring well. This is put in a dryer and kept at 80 ° C to 100 ° C for 2 hours to be dried to vaporize water and ammonia. As a means to combine the obtained antibacterial powder with a synthetic resin, in the process of pelletizing with an extruder for resin, the antibacterial powder is mixed to make an initial composite resin, which is combined with zinc oxide whiskers during the injection molding process. Let The above-mentioned synthetic resin is polypropylene, which is made into a pellet by compounding antibacterial powder 1, zinc oxide whiskers 1 and polypropylene 8 in a weight ratio. Also,
The zinc oxide whiskers used in this example have a three-dimensional structure in the form of a single crystal tetrapot.
Zinc vapor generated by heating at 0 ° C. and zinc oxide whiskers in the forming process were grown while passing through an oxidizing atmosphere. An electron micrograph of the zinc oxide whiskers is shown in FIG. The zinc oxide whiskers with a three-dimensional structure of a single crystal tetrapot shown in FIG. 2 have a fiber length of 2-3 μm.
It can be arbitrarily adjusted from m to several hundred μm, specific gravity 5.7 (air permeation method), sublimation temperature 1720 ° C, tensile strength 2
70 to 280 kgf / cm ² , bending strength 440 kgf / cm ² ,
It has characteristics such as a flexural modulus of 20,000 to 21,00 kgf / cm ² .

Zinc oxide whiskers, materials A, B, with different combinations of polypropylene and carrier powders adsorbing silver ions
C and D were obtained as shown in (Table 1).

[0012]

[Table 1] Antibacterial / rust preventive agent 5 in pellet form shown in (Table 1)
0 g of each was stored in the housing 4 of the wastewater tank 1 shown in FIG. At the same time, 20 cm of steel wire with a diameter of 0.5φ is put into the sewage basin 1, the steel wire left for 50 days is taken out from the sewage basin 1, the weight before and after the test is measured, and the reduction rate of the steel wire is expressed as a percentage. The results of comparing the rates of rusting are shown in (Table 2). In addition, (Table 2) shows the state of green algae generated in the wastewater basin 1.

[0013]

[Table 2] As is clear from the above (Table 2), the rust preventive effect is large for the materials C having a content of zinc oxide whiskers having a three-dimensional structure of a single crystal tetrapot and having a content of 20% and material D having a content of 30%. It has the effect of suppressing the generation of algae, and indicates that the content of zinc oxide whiskers of 20% or more is necessary for antibacterial / rust prevention.

(Embodiment 2) In FIG. 3, 31 is a concrete pipe for drainage, which is installed on the ground or buried underground. 32 is this concrete pipe 3
In the antibacterial / rustproof layer formed on the inner surface of No. 1, cement is coated with the antibacterial / rustproof powder before pelletization obtained in the same manner as in Example 1 on the inner surface of the concrete pipe 31.

In the antibacterial / rustproof powder obtained in Example 1, the silver ion supported on 10 kilograms of hydroxyapatite is the ion obtained from 1 gram of silver, and therefore silver is 0.01% by weight based on the carrier. Nothing more than. Since this carrier is mixed with zinc oxide whiskers and further mixed with cement to form an antibacterial / rustproof layer on the inner surface of the concrete pipe 31, silver present in the antibacterial / rustproof layer is 0. 0
It is a very small amount of 02 to 0.005% by weight and does not increase the cost of the concrete pipe. Also, hydroxyapatite as a carrier and zinc oxide whiskers as an additive compound can be obtained at low cost, so that a composition of an antibacterial / rust preventive agent other than silver can increase the cost of concrete pipes. not. The reason why a very small amount of silver ions having antibacterial performance is effective is that zinc oxide whiskers improve the antibacterial effect by 10 times to 100 times more than the fact that the specific surface area of the carrier is large. This is because it has a rust effect.

It should be noted that silver is generally about 10% of the total amount of silver ion used as an antibacterial agent, which is commercially available. Compared with this, the antibacterial and rust preventives used for the concrete pipe of this embodiment are compared. It can be said that the silver content in the layer is about 1/1000.

Concrete pipe 31 obtained in Example 2
The internal antibacterial / rustproof layer 32 suppresses the generation / proliferation of microorganisms such as mold, bacteria, and algae even by the sewage flowing inside. It is extremely superior to the adherence of microorganisms and agar substances. At the same time, even if iron products flow into the concrete pipe, iron rust does not occur in the concrete pipe of this embodiment.

Below, materials E, F, G and H shown in Table 3 were obtained by changing the proportion of zinc oxide whiskers added to silver-hydroxyapatite so that the weight ratio was 0 to 30%.

[0019]

[Table 3] Then, an antibacterial function test was conducted on the materials obtained in (Table 3), and the results are shown in (Table 4).

[0020]

[Table 4] The molds used in the tests shown in (Table 4) are the 1st group Aspergillus niger, the 2nd group Penicillium citrinum, the 4th group Cladsporium cladsporioides, and the 5th group Ketomium according to JIS2911 “mold resistance test method”.
There are five species of globosum and the fungus Candida albicans. As the test method, Sabouraud-agar medium was poured into a petri dish, and antibacterial powder was uniformly and thinly sprayed on the surface. Thereafter, the test bacterium was uniformly applied over the entire surface, placed in a weather meter, and the conditions were set to a temperature of 28 ° C. and a humidity of 70 to 75%, and then allowed to stand for 150 hours to examine the state of reproduction of the test bacterium.

According to the above (Table 3) and (Table 4), the antibacterial function is particularly high when the content of zinc oxide whiskers is 20% by weight or more, and the material E having no zinc oxide whiskers at all has no antibacterial function. I understand.

In order to provide the material E with an antibacterial function, it is considered necessary to contain silver ions in a large amount of 100 to 1000 times.

(Embodiment 3) In FIG. 4, reference numeral 41 designates a gutter in which a lid 42 made of concrete is placed on a stepped portion 43, which is molded with concrete and has an antibacterial and antibacterial structure obtained in Embodiment 1 on its inner peripheral portion.
The anti-corrosive agent 44 is mixed in the form of pellets.
The gutter 41 obtained in this Example 3 is buried on the side of the road, and mainly drains domestic household water.

Therefore, the wastewater is discharged from households such as kitchen treatment, and wastewater including dust on the road. In the gutter, microorganisms such as mold, bacteria, algae, agar-like substances and rust caused by iron scraps, etc. It is unsanitary and unclean.

However, since the pellet-shaped antibacterial / rust preventive agent 44 obtained in Example 1 is mixed in the inner peripheral surface of the side groove 41 according to the present embodiment, the side groove 41 is manufactured.
It is free of microorganisms such as mold, bacteria and algae, agar-like substances and iron rust, and it is pollution-free and contributes significantly to the improvement of the living environment. In this embodiment, the same effect can be obtained by using copper or zinc ions instead of silver ions, and calcium carbonate or ceramics such as Dosen (soybean paste) instead of hydroxyapatite.

[0026]

As is apparent from the above description of the embodiments, the sewage system of the present invention prevents or suppresses the generation and growth of microorganisms such as mold, bacteria and algae, agar and iron rust. In addition, it provides an excellent sewage system that has very few ions of silver, copper, zinc, etc., which play a central role in the antibacterial function, is environmentally safe, and has no pollution and low cost for both carriers and zinc oxide whiskers. It is a thing.

[Brief description of drawings]

FIG. 1 is a sectional view of a sewage basin according to a first embodiment of the present invention.

FIG. 2 is an electron micrograph of zinc oxide whiskers having a three-dimensional structure of a single crystal tetrapot contained in the antibacterial / rust preventive agent used for the sewage basin.

FIG. 3 is a sectional view of a concrete pipe according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a side groove according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Sewage basin 3 Antibacterial / rust preventive agent 4 Case 31 Concrete pipe 32 Antibacterial / rust preventive layer 41 Gutter 44 Antibacterial / rust preventive agent

Claims (5)

[Claims] 1. An antibacterial ion comprising one or more metal ions selected from the group consisting of silver, copper and zinc, and calcium carbonate, calcium phosphate and a ceramic material which adsorb and carry the metal ions. Sewage system equipped with an antibacterial / anticorrosive agent that is a mixture of a carrier mainly composed of one or more carriers selected from the group and a zinc oxide whisker having a three-dimensional structure of a single crystal tetrapot. .. 2. A sewage system having a portion mixed with the antibacterial / rust preventive agent according to claim 1. 3. Sewage equipment having a portion coated with the antibacterial / rust preventive agent according to claim 1. 4. An antibacterial / rust preventive agent containing 1% by weight of a metal capable of eluting metal ions as an upper limit.
Sewage equipment described in 2 or 3. 5. Zinc oxide whiskers in an amount of 10 or more and 30% by weight
A combined antibacterial and rust preventive agent contained up to
Sewage equipment according to 2, 3 or 4.