JPS5857965B2 - Sterilizing and filtering agent for water treatment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sterilizing and scouring filter for water treatment, and particularly to a sterilizing and scouring agent for water treatment using a nonwoven fabric.

Generally, water treatment methods include one-pass method using gravel, silicic acid, activated carbon, etc., neutralization method with acid or alkali, ion exchange method,
Methods such as activated sludge method using microorganisms are used to reduce BOD and drain water, but in these water treatments, if sterilization and sterilization are performed at the same time, it is possible to reuse the water or use it for water such as swimming pools. It is valid.

Recently, due to the shortage of industrial water, companies are considering reusing water once used.

However, since wastewater contains many bacteria, it is difficult to reuse wastewater.

At present, there are methods that aim to both filtrate and sterilize wastewater. It is being considered that activated carbon can be treated with silver nitrate to produce activated carbon with high sterilizing power, and that activated carbon can be used for both sterilization and sterilization purposes.

However, it takes a relatively long time to adsorb sodium alginate onto granular or flaky activated carbon, and it is difficult to wash off the unadsorbed sodium alginate, and furthermore, sodium alginate remains around the activated carbon. and,
The sewage tank will become dirty and rot.

Furthermore, when granular or flake activated carbon, which has been treated with silver nitrate and has a high bactericidal effect, is used for water treatment, a considerable amount of silver, a heavy metal, will be contained in the water, which is a major pollution problem. In addition to this, the bactericidal power of the activated carbon also decreases.

The object of the present invention is to provide a sterilizing and filtering agent for water treatment that can effectively sterilize and filter water without such drawbacks. This is a sterilizing and filtering agent for water treatment that has been adsorbed with.

The sterilizing and filtering agent for water treatment of the present invention can be obtained by immersing a nonwoven fabric in an alginate solution, taking it out, immersing it as it is or drying it in a silver salt solution or suspension, taking it out, washing it with water, and drying it. Alternatively, it can be produced by immersing a nonwoven fabric in a silver salt solution or suspension, taking it out, washing it with water, and immersing the nonwoven fabric as it is or dried in an alginate solution, taking it out, and drying it.

Any type of nonwoven fabric can be used; specific examples include Vilene FCC55, 60, 70, Fe
2O2, CH-161N10R210, AC-20, H
-8010, FC510, FC-550, FX-100
1 (both manufactured by Nippon Vilene Co., Ltd., trade names).

The nonwoven fabric may be used in its commercially available size, but it may be cut to match the size of the filter, or it may be cut into squares, rectangles, or other suitable shapes to increase the surface area. It is preferable to use it.

For example, if you want to use it for a tank for ornamental fish (100, e), cut it to about 20 x 10 crIL, or
It is also recommended to use one cut into 1 to 3 cIrLX1 to 3CrIl squares (also 1 to 3 CrL when used in a cylindrical waste tank).
It is preferable to use one cut into a size of about 3 CrrL x 1 to 3 CrrL.

In the present invention, as the alginate solution, an aqueous solution of water-soluble alginate, for example, an aqueous solution of sodium alginate is preferably used.

As the silver salt solution, for example, an aqueous solution or suspension of silver oxide, silver nitrate, silver sulfate, etc. is preferably used.

Thus, for example, an aqueous solution or aqueous suspension of 0.5-2% sodium alginate and 0.1-1% silver salt is prepared, and a cut or uncut nonwoven fabric is placed in the sodium alginate aqueous solution for 5-10 min. Soak for a minute, take out,
By immersing it in an aqueous solution or suspension of a silver salt for 1 to 5 minutes with or without drying, taking it out, washing it with water, and drying it, a blackish-brown sterilizer and filtration agent for water treatment of the present invention is obtained.

Alternatively, the nonwoven fabric may be immersed in an aqueous solution or suspension of the above-mentioned silver salt for 1 to 5 minutes, taken out, washed with water, dried, or immersed without drying in the above-mentioned aqueous solution of sodium alginate, taken out, and dried. Also, the sterilizing and filtrating agent for water treatment of the present invention can be obtained.

If the sterilizing and scouring agent for water treatment of the present invention is in the form of a plate that matches the size of the scouring tank, it can be laminated on the swabbing tank to the desired height.

Furthermore, if the sterilizing and scouring agent for water treatment of the present invention is fine, it can be directly filled into the scouring tank to the desired height.

For example, if it is cut to the size of an E filter, it depends on the amount of water to be treated, but if it is for a 301 aquarium, it will be 5C7r.
If the layers are stacked to a height of about L and the amount of water is more than that, 2
Stack them to a height of about oCIrL.

**In addition, in the case of a cylindrical wastewater tank, the finely cut material is packed to a height of 5 to 20 cm.

When water treatment is performed using the sterilizing and filtrating agent for water treatment of the present invention, water can be sterilized and filtered very effectively and efficiently.
Moreover, the amount of silver eluted into 1-peroxide water is extremely small compared to when silver salt is adsorbed onto granular or flake activated carbon.

For example, use a p filter with a diameter of 10 CTL and a height of 30 crrL, place glass wool at a height of about 2 cIn on the part where the super water comes out, and place the sterilizing and purifier of the present invention with a size of 2 crA ( The nonwoven fabric was immersed in a 1% sodium alginate aqueous solution for 5 minutes, then taken out and dried, then immersed in a 1% silver nitrate aqueous solution for 1 minute, taken out, washed with water, and dried. Make a vessel.

Sewage 101 containing 1800 E. coli/100mA
continuously at a flow rate of 1. When the water was run at a rate of e/min, the liquid that passed through the p-filter contained zero E. coli, and recycled water with no odor and good transparency was obtained.

Next, when water treatment is performed using the sterilizing and filtrating agent for water treatment of the present invention, the amount of silver salt eluted into 1 per water is reduced by using granular activated carbon with silver salt and alginate adsorbed. The following is an explanation based on experimental results that the amount is extremely small compared to the case where

That is, sample A was a sterilizing and filtering agent for water treatment obtained in the same manner as described in Example 1 below, and commercially available granular activated carbon was immersed in a 1% silver nitrate solution for 5 minutes, taken out and washed with water.
Sample B was obtained by immersing the sample in a 1% sodium alginate aqueous solution at 0° C. for 10 minutes, then taking it out and drying it.

Table 1 shows the amount of silver eluted into 1-percent water when samples A and B were used as filtering agents and water was passed through the column and filtered by the method described in Example 1 below. be.

From the results in Table 1, it is clearly seen that the amount of silver eluted into 1-peroxide water is extremely smaller when Sample A is used than when Sample B is used.

Furthermore, in producing the sterilizing and filtrating agent for water treatment of the present invention, alginate can be adsorbed in a short time and unadsorbed alginate can be easily washed away. When a water treatment sterilizer and scouring filter is used for water treatment, there is an advantage that the filtration device is hardly contaminated by alginate.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example I Fe2O2 Vilene (nonwoven fabric manufactured by Nippon Vilene Co., Ltd.) was cut into 2 ca pieces, immersed in a 1% silver nitrate solution for 5 minutes, taken out, washed with water, and then immersed in a 1% sodium alginate aqueous solution at 6°C for 5 minutes. After soaking, it was taken out and dried.

The sterilizing and filtrating agent made of this non-woven fabric is 15 cIrL in diameter.
It was filled in a column made of a plastic cylinder with a height of 30 crIL and equipped with a valve at the bottom to allow a certain amount of water to drain.

The amount of filling was made to be about 15 crIL in height.

Next, sample water containing E. coli with a bacterial count of 2000/100 ml was prepared, and this water was continuously passed through this column, and the water that had passed through the column was taken over time and the number of E. coli bacteria was examined.

The results are shown in Table 2, and it can be seen that when the sterilizing and purifying agent of Example 1 is used, a good sterilization rate can be achieved even after 1 minute.

Example 2 FCC55 Vilene (nonwoven fabric manufactured by Nippon Vilene Co., Ltd.) was cut to 1 crA, immersed in a 0.5% sodium alginate aqueous solution for 10 minutes, taken out and dried, and immersed in a 0.5% silver nitrate aqueous solution. It was immersed for 5 minutes, taken out, washed with water, and dried to obtain a disinfectant and filtration agent.

This material is packed in a cylindrical p-filter with a diameter of 10 CrrL and a height of **30 CIn.

At this time, activated carbon was spread to a height of 3 cm and 11 L, and the sterilizing and cleaning agent made of the above-mentioned nonwoven fabric was filled thereon to a height of 5 cm.

Sewage containing 1800/100 rILl of E. coli was continuously flowed through this column at a rate of 11/sec, and the excess water was collected over time to examine the decrease in the number of bacteria.

The results are shown in Table 3.

Example 3 Vilene 0R-210 (nonwoven fabric manufactured by Nippon Vilene Co., Ltd.) was cut into 30×10 771 pieces, and this was 0.5%
After being immersed in a silver nitrate aqueous solution for 10 minutes, it was taken out, washed with water, immediately immersed in a 1% sodium alginate aqueous solution for 5 minutes, taken out and dried.

★★ Place this at a height of 3cm at the bottom of a filter placed above a 5Ol water tank.
It was laminated on rIl to make a filtration agent.

Sewage was diluted and adjusted to 1300/100 ml of Escherichia coli in the water tank, and the water was circulated through a filter using a water pump.

Table 4 shows the results of taking water from the aquarium over time and examining the presence of E. coli.

Example 4 Vilene 0R-210 (nonwoven fabric manufactured by Nippon Vilene Co., Ltd.) was cut into 10×10 CrIL, and this was
After being immersed in a 0.5% silver oxide aqueous solution for 10 minutes, it was taken out and washed with water, immediately immersed in a 1% sodium alginate aqueous solution for 10 minutes, taken out and dried.

This was stacked in an 11 volume column to a height of 10 c/n.

When sewage containing 1100/100 ml of Escherichia coli was passed through this and the p-permeability was examined, the results were as shown in Table 5 below, indicating a good sterilization effect.

Claims (1)

[Claims] 1. A sterilizing and filtering agent for water treatment that has alginate and silver salt adsorbed on non-woven fabric.