JP2003001264A - Filter having sterilizing function and water treatment method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a filter medium whose sterilizing effect is reliable and an inexpensive and reliable water treatment method in relation to a filter medium having such an antibacterial function as to remove injurious microorganisms. SOLUTION: In the water treatment method, the filter medium of sand having an antibacterial function is composed of sand coated with an organic quaternary ammonium salt and an inorganic metal compound and contaminated water is introduced from the inlet or outlet of a filter and filtered.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a filter using a filter medium having an antibacterial function and a filtration process thereof.

In particular, it relates to a water treatment process including a method of filtering water through a sand bed coated with a chemical having an antibacterial function that kills fungi and inhibits its growth.

[Prior art]

It is known that a metal having an antibacterial function is mixed with industrial or household paints and fibers.

It is known that organic quaternary ammonia bases have an antibacterial function.

The following patents show the use of silver, copper and zinc in substances with antibacterial function and the use of organosilicon compounds.

US Pat. No. 3,865,728 shows an organosilicon compound coated on a fibrous substrate, which is 6 degrees Celsius.
It is heated from 5 to 100 degrees.

The resulting product is used in aquarium aquariums for algae control.

US Pat. No. 5,147,686 describes copper and zinc,
A powder having an antibacterial function made by covering a titanium oxide base material with a metal having an antibacterial function including copper and silver, copper and aluminum, copper and tin, or a combination of these metals, copper, zinc or an alloy is shown. ing.

The composition exhibits antibacterial properties against E. coli, Salmonella, and various other microorganisms.

The coated substrate is described as being heated to 400 degrees Celsius with a fire.

The powder of this product is intended to be incorporated into a resin.

US Pat. No. 5,151,122 relates to an antibacterial ceramic material.

Ceramics such as zeolite or alumina or clay are mixed with an antibacterial metal such as silver, copper or zinc and heated to a high temperature of 1200 to 1300 degrees Celsius to fix it. It is said that.

The material of that patent is proposed to be added to a resin that can be molded into any shape.

US Pat. No. 5,415,775 describes 100 degrees Celsius.
It relates to an ultra thin film filter made of alumina and titanium dioxide, which is sintered at 0 to 1500 degrees and then covered with a metal oxide film.

This film is described as exhibiting antibacterial properties.

US Pat. No. 5,618,762, 550384
0 and 5595750 indicate silver, copper, zinc, platinum, cadmium and chromium as antibacterial materials including a protective coating.

All of the above patents include a water reservoir,
It does not address the problem of keeping water free of algae or fungi containing harmful and minute organic matter in cooling towers, public baths, and fish farms.

[Problems to be Solved by the Invention]

In view of the above problems, an object of the present patent is to provide a filter medium having an antibacterial function.

Further, by using a specific process, in the above-mentioned place, a colon bacillus, a salmonella and a yeast such as Candida, algae (cyanobacteria, brown algae, green algae), and fungi (bulbar hair fungi, It is to remove harmful microorganisms such as Rhodophyceae.

Further, it is to provide a water treatment process by using a low-cost filter medium using a substance having an antibacterial function.

[Means for Solving the Problems]

In order to solve the problem, it is to provide a filter medium having an antibacterial function, which is covered with a metal compound such as silver or copper or covered with a quaternary ammonia salt of an organic substance.

This filter medium is easy to handle for removing harmful microorganisms and can be easily replaced when necessary.

By using this filter material, the method for filtering water can be carried out by the equipment which is already generally used.

DETAILED DESCRIPTION OF THE INVENTION

The sand coated with the sterilizing material is put in a container or wrapped with a net having a mesh smaller than the sand.

When the disinfectant coating is exhausted, the container is replaced.

【Example】

A component having an organic antibacterial function is a quaternary ammonia salt represented by Chemical Formula 1.

In this chemical formula, m + n is 16 to 19,
m is 1 to 6 and n is 13 to 17, or m +
n is 20 to 23, m is 4 to 11 and n is 9 to 17,
X is a halogen and Y is a hydrolyzable group or a hydroxyl group.

The component having an inorganic antibacterial function is silver or copper.

The metal component having an antibacterial function is individually coated on the surface of sand, and the sand thus coated is used alone as a filter medium or mixed with sand coated with an inorganic material,
Used for water purification.

In sand corresponding to 10 to 20 mesh,
1% by weight of silver nitrate solution or 1% by weight of copper nitrate solution
Soak each.

The soaked sand is baked at 500 degrees Celsius for about 4 hours.

The coated, dry sand is then washed in an ultrasonic cleaner to ensure that no loose chemicals have been deposited on it.

The coating process for the quaternary ammonia salt is described below.

In the step of coating the sand, —Si (OH) 3
The quaternary ammonia salt is dissolved in water to form the.

Further, the sand is immersed in the aqueous solution.

The quaternary ammonia salt reacts with the sand of silicon dioxide to form a strong chemical bond.

Trimethoxysilyl, propyl, octadecyl, dimethyl ammonium chloride are typical quaternary ammonia salts for immediate application.

In the process of producing the filter material having the organic antibacterial function of the present invention, special sintering is important for firmly binding the quaternary ammonia salt to the base material.

The component to be sintered is aluminum oxide having a high area ratio per unit volume.

Other sinterable components are SiO 2 or Si
O2 and Al2O3.

In order to produce a filter medium having an organic antibacterial function, aluminum oxide is mixed with water in a ratio of 1: 1 to 1:10 by weight.

Acids such as nitric acid, hydrochloric acid, or oxalic acid are adjusted to have a pH of 3 to 6 and mixed.

Once the compound is in the gelatinous solution, the sand is immersed in the gelatinous solution.

Thereafter, the sand to be baked and coated has a temperature of 4 degrees Celsius.
It is fired at 00 to 1500 degrees, preferably 500 to 800 degrees.

The quaternary ammonia salt is 0.0
5 to 20%, preferably 0.3 to 0. 6% water,
It is soluble in solvents selected from the group consisting of alcohols, ketones, esters and hydrocarbons.

Water is the preferred solvent.

The sand prepared and calcined as described above is immersed in the solution until it is saturated or absorbs 50% of the quaternary ammonia salt.

Thereafter, the sand immersed in the solution to form a filter material having an antibacterial function with the organic material is cooled to 5 degrees Celsius.
It is dried at 0 to 200 degrees, preferably 60 to 150 degrees.

The time to dry the sand depends on the amount of sand used.

In a simplified process, sand is directly immersed in 0.3 wt% quaternary ammonia salt silane and then dried at about 150 degrees Celsius.

【The invention's effect】

Since the present invention is configured as described above, it has the effects described below, and more precisely, the present invention provides a new method for preparing a filter medium having an antibacterial function. .

Furthermore, this filter material not only kills fungi but also inhibits the growth of algae.

The filtering material having an antibacterial function of the present invention is
For example, it may be placed in a cooling tower where water is circulated to kill microbes.

Furthermore, it may be arranged to circulate the air in the air conditioning equipment to sterilize the air.

After use, the filter medium can be rinsed with clean water, or by vibrating the ultrasonic device, using a blower to remove any accumulated debris, and reversing the water flow. By doing so, it can be cleaned and the effect can be restored.

In addition, the organically coated sand is treated with bromophenol blue to quantitatively show the presence of quaternary ammonia salts.

This blue color indicates that the ammonia salt is of sufficient strength.

When the color changes to purple, it is the time to replace the newly coated sand.

This is a reliable and convenient quality control method.

US Pat. Nos. 3,817,452 and 3865
Quaternary ammonia organosiloxane salts (herein referred to as quaternary ammonia salts) used as anti-algal material by coating on a fibrous material such as that shown in 728. Does not form part.

[Example 1]

A filter material having an inorganic antibacterial function is prepared.

By weight, the metal component AgNO 3 is 1 and water 99
The solution of 1 is prepared, sand of 10 mesh is put therein, and it is immersed until it is saturated, and the excess solution is discharged.

The coated substrate is placed at 800 to 90 degrees Celsius.
Bake at 0 degrees.

Next, a production process of a filter material having an organic antibacterial function will be described.

10% in 100 ml of 0.3 wt% propyl, octadecyl, dimethyl ammonium chloride aqueous solution
Add 0 g of sand substrate and soak until saturated.

Absorb at least 50% of the solution.

The wet substrate is dried at 100 degrees Celsius for about 30 minutes to allow chemical bonding to occur.

The inorganic coated sand may be mixed with the organically coated sand.

Further, a reverse water flow may be used in which water enters from the bottom of the container, passes through the coated sand filter material upward, and then exits from the top.

The counter flow is intended to increase the chances of contact between the water and the filter material and create even more turbulence.

Any container with inlet and outlet tubing can be used as a tool for the filtration process of this invention.

Preparations for exchanging sand with antimicrobial function should be made.

Instead of the container, the sand having the antibacterial function may be wrapped with a wire mesh having a mesh smaller than the sand particles.

Example 2

Test of efficacy of filter material having antibacterial function

Uncoated sand, sand covered with a quaternary ammonium salt (A), sand covered with a copper compound (B), and sand covered with a silver compound (C), respectively. Prepare 4 samples of 5 g of sand.

All coatings are carried out in the steps described above, followed by a water wash to remove loose, chemically attached surfaces.

Escherichia coli is cultured overnight and diluted 100 times with a nutrient solution.

The diluted E. coli is evenly distributed among four 20 ml tubes.

Four samples of each marked test tube were placed in a stirrer for 3 hours to allow the fungus to grow sufficiently.
Incubate at 7 degrees.

As a result of the above, in order to examine the growth rate of Escherichia coli, each test tube was inserted into a spectrophotometer, and the light intensity is shown in Table 1.

In conclusion, the filtration process using the antibacterial filter media improves the water quality many times.

It shows that the filter material of silver compound is the filter material having the most effective antibacterial function.

The example of US Pat. No. 605124 is incorporated herein by reference.

The efficacy of the quaternary ammonia salt coated honeycomb shaped substrate established by the applicant of the prior invention established in US Pat. No. 605124 is shown in Table 2 and shows the viability of the fungus.

The Legionella bacteria die on contact with a substance having an antibacterial function within 10 minutes.

E. coli die in about 60 minutes and Salmonella die in about 40 minutes.

The viability of the first inoculated Legionella bacteria is shown to be similarly suppressed.

The effect of the quaternary ammonia salt coated on sand has the same effect.

[Brief description of drawings]

## STR00001 ## is a chemical formula showing the structure of a quaternary ammonium salt.

Table 1 is a table showing the difference in the growth rate of E. coli.

[Table 2] A graph showing the survival rates of various bacteria.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 3, 2001 (2001.9.3)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Detailed explanation of the invention

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a chemical formula showing the structure of a quaternary ammonium salt.

FIG. 2 is a table showing the difference in the growth rate of Escherichia coli.

FIG. 3 is a graph showing the survival rates of various bacteria.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C02F 1/50 532 C02F 1/50 532D 550 550C 560 560Z ZAB ZAB A01N 33/12 101 A01N 33/12 101 55 / 00 55/00 B 59/16 59/16 A 59/20 59/20 Z B01D 39/06 B01D 39/06 (72) Inventor Tadanori Kure Nanjing East Road 4F 51st Section, Nanjing East Road, Taipei City, Taiwan Taiwan F-terms in Science & Technology Co., Ltd. (reference) 4D019 AA03 BA07 BB12 BC06 BD10 4H011 AA02 BA01 BA06 BB04 BB16 BB18 BC20 DA02 DD01

Claims (11)

[Claims] 1. A sand, which has an antibacterial function selected from the group coated with silver, copper compounds, quaternary ammonia salts, and mixtures thereof, is placed in a water tank in a predetermined amount and filtered. It includes a filter that introduces water through the sand as material and a process for treating contaminated water. 2. The quaternary ammonia salt according to claim 1 is trimethoxysilyl, propyl, octadecyl, dimethylammonium chloride. 3. The silver compound according to claim 1 is silver nitrate. 4. The copper compound according to claim 1 is copper nitrate. 5. The filter material having an antibacterial function includes sand coated with a silver compound. 6. A filter medium having an antibacterial function includes sand coated with a copper compound. 7. A filter medium having an antibacterial function includes sand coated with trimethoxysilyl, propyl, octadecyl, dimethylammonium chloride. 8. In the water treatment step of claim 1, water to be treated is introduced into a tank from an inlet, the water is passed through the sand from the top to the bottom, and clean water is discharged from the outlet of the tank. The step of taking out is included. 9. The water treatment step of claim 8 includes the step of introducing water from the outlet and passing the inside of the filter medium from the bottom to the top to take out clean water from the inlet. 10. The method of claim 7, including monitoring the quality of the coating with bromophenol blue. 11. The method for treating water according to claim 1, which further comprises a method of putting sand having an antibacterial function into a container made of wire mesh having meshes smaller than the sand particles.