JPS62215508A - Water treating agent - Google Patents

Abstract

PURPOSE:A water treating agent, containing at least one compound capable of releasing ions having water purifying and bacteriostatic action in an aqueous solution, i.e. heavy metal ions or alkali metal ions in glass and capable of readily preventing occurrence of bacteria or algae. CONSTITUTION:A water treating agent consisting essentially of a soda based or soda-lime based glass (particularly glass consisting of 10-40wt% Na2O, 0-80wt% SiO2 and 0-30wt% B2O3) and/or phosphoric acid based glass (particularly glass consisting essentially of 10-40wt% Na2O, 20-70wt% P2O5, 0-70wt% SiO2 and 0-30wt% B2O3) containing at least one compound capable of releasing heavy metal ions, particularly preferably silver ions and alkali metal ions, e.g. Na, Li, K, etc. EFFECT:Bacteria and algae can be stably controlled by simple operation for a long period.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to water treatment, and more particularly to a water treatment agent mainly composed of soda-based or phosphate-based glass.

[Conventional technology]

In temporarily stored water in aquariums and cooling towers, residual chlorine is removed over time, but organic matter remains, creating conditions that make it easy for microorganisms such as bacteria and algae to grow, causing various problems. . For example, the growth of bacteria can cause corrosion, and algae can cause pressure loss.

[Problem that the invention seeks to solve]

The problem to be solved by the present invention is to eliminate the above-mentioned difficulties in conventional water treatment equipment based on bacteria and algae. The objective is to develop a means to overcome the above-mentioned difficulties.

[Means for solving problems]

This problem can be solved by incorporating compounds, such as heavy metal ions and alkali metal ions, that can release ions with water purification and bacteriostatic effects in an aqueous solution, and making the glass compatible with water treatment equipment. be done. That is, the present invention relates to a water treatment agent mainly composed of soda-based, soda-lime-based, or phosphate-based glass containing at least 171 compounds capable of releasing heavy metal ions or alkali metal ions.

[Structure and operation of the invention]

In the present invention, since components such as compounds capable of releasing heavy metal ions or alkali metal ions are contained in the soda-based, soda-lime-based or phosphate-based glass,
When this glass is added to the water to be treated, as the glass gradually dissolves in the water, the above-mentioned components contained in the glass are eluted.

The ions generated from these components all have excellent water purification performance and bacteriostatic action, and can prevent the growth of bacteria and algae in water, which in turn can solve the above-mentioned problems. .

As is well known, silverware has been used for tableware and voyages since ancient times. This is thought to be due to the water purifying and bacteriostatic effects of silver ions precipitated in the water. This is what we have come to.

Typical examples of the glass used in the present invention include soda-based or soda-lime-based glass and phosphate-based glass.

This soda-based or soda-lime-based glass contains, for example, 10 to 40% by weight of Na20 (hereinafter simply referred to as %).
, preferably 30-40%, SiO2 0-80%, preferably 30-70%, B2O3 0-30%, preferably O-20%.

Incidentally, as long as it has this basic composition, other glass components may be included to some extent.

In addition, as a phosphate glass, for example, Na20 is 10
~40%, preferably 20-30%, P2O5 is ~20
70%, preferably 30-60%, S i 02 is 0-
70%, preferably 0-30%, and B2O30-30
It is preferable to have a basic composition of about 0 to 20%.

Similarly, other glass components may be slightly included.

In the present invention, it is preferable that these glasses have a constant dissolution amount in water as much as possible.

For example, in soda-based and soda-lime-based glasses, heavy metal ions and alkali metal ions are preferentially eluted into water from the glass surface, and the SiO2 component does not dissolve but forms a surface layer, causing the internal ions to elute temporarily. Being held down. As the melting progresses further, strain occurs between the undissolved layer and the glass layer on the surface, causing them to separate, exposing a new glass surface, and causing each ionic component to elute from that surface again. By repeating this process, the dissolved amount of each ionic component may not always be constant and may become irregular. FIG. 4 shows representative examples of three types of glasses having different melting characteristics. However, in Figure 4 (
A) is a glass in which the increase in melt amount is not constant, (B) is a glass in which the increase in melt amount is uniform and has a high dissolution rate, and (C) is a glass in which the increase in melt amount is uniform but the dissolution rate is slow. In the present invention, it is particularly preferable to use a material with a uniform increase in the amount of dissolution and a high dissolution rate, which indicates glass, and the arrow in the figure indicates the occurrence of peeling. Such soda-based and soda-lime-based glasses contain SiO2 of 30 to 10% In and Na2C)'l as the glass components.
It is preferable that the amount of B2O3 is 30 to 40% by weight, and 0 to 30% by weight of B2O3, or 0 to 20% of at least one of AJ203, MgO, BaO, and Cao.

Phosphate-based water-soluble glass has a constant melting amount.

However, if necessary, a dissolution rate regulator can be used, and as this regulator, at least 1 [0 to 50%] of AJ203, CaOlMgO and BaO can be used, and the present invention uses these regulators. It is preferable in this case.

In the present invention, these components to be included in the glass component are compounds that generate heavy metal ions and alkali metal ions in an aqueous solution, and examples of heavy metal ions include silver, gold, platinum, copper ions, etc. Specific examples include sodium, lithium, potassium and other ions as alkali metal ions. These components may be any as long as they can generate each of the above ions. As these components, silver is particularly preferred from the viewpoint of both bacteriostatic effect and algae-preventing effect.The proportion of each of these components to the glass is usually about 0.3 to 5%, preferably about 0.5 to 2.5%. be.

When using the water treatment agent of the present invention, the glass may be adjusted to a size that allows light to pass through.

〔Example〕

Examples are shown below, where % indicates weight %.

Example 1 General bacteria isolated on an ordinary agar medium (37°C, 24 hours) were diluted with tap water from which residual chlorine had been removed, and the initial bacterial count was 10' c/mj, l O2c/m1.105c/ m
Three types of bacterial suspensions (18°C) were prepared.

To this, P2O565.7%, Na2026.7%, B'
2035.6%, Aj+2032% as the main component, A
Add 0.5%, 1.5%, and 3.0% of g2O, respectively.
After melting at 1,350°C for 1 hour, three types of phosphoric acid glasses were prepared by rapidly cooling on a carbon plate and stably containing monovalent silver ions, and these were ground in a ball mill to 350°C. It was made into a powder with crm or less.

Add this to the above bacterial suspension 34! The bacteriostatic effect of the glass of the present invention was investigated from the growth characteristics of general bacteria when 5 g of each was added to 0.51.

The results are shown in Figures 1 to 3. However, Figure 1 shows the initial bacterial count (
Figure 2 shows the initial bacterial count (102
Figure 3 shows the initial bacterial count (105 c/ml).
(A) shows no addition of Ag2O, (B) shows the case of j).
) shows the results when added at 0.5%, (C) at 1.5%, and (D) at 3.0%.

From the experimental results, when the initial bacterial count was 10'c/mj+, all three types of glass exhibited a bacteriostatic effect. Initial bacterial count 10
At 2c/mJO, the bacteriostatic effect of the Ag2005% glass shown in curve (I3) decreased over time.
Curve (C), a glass containing 201.5% Ag, required time for bacteriostasis. When the initial bacterial count is 10'c/ml, A of curve (D)
g.03.0% glass also required time for bacteriostasis.

In this way, the bacteriostatic effect mainly depends on the number of bacteria and the amount of silver added in the glass, and is also affected by the amount of water to be treated, the temperature, and the difference in specific surface area due to the amount and shape of the glass added. Understood.

Example 2 Glass with the same composition as Example 1 (however, Ag2O was 1.0%)
) with a thickness of 2 to 41) 1) 1% diameter of 2 to 3
It was molded into the shape of cm and poured into three kinds of predetermined sample waters A, B, and C shown in Table 1 below. The amount of water added at this time is 1)
vs. glass lOg.

For these sample waters A, B, and C, the number of general bacteria and the amount of metal elution over time were measured using an atomic absorption spectrometer model 180-30 manufactured by Hitachi, Ltd.

The results are shown in Table 1. However, in Table 1, A, B, and C indicate the case where no glass was added, and A, B, and C indicate the case where the glass of the present invention was added. It represents the amount of elution, and the unit is ppm.

Table 1 The following is clear from Table 1.

Compared to A, B had temperature conditions that made it difficult for general bacteria to grow, but bacteria started to grow on the fourth day. It is expected that the number of bacteria will increase in the future, similar to A. Compared to B, B' has a bacteriostatic effect. Since there is residual chlorine in C, bacteria do not occur even on the 4th day.

However, it is expected that it will occur once chlorine is gone.

Example 3 Glass was made using the same composition and method as Example 1 and had a diameter of 2
It was molded to ~2.5 cm and a thickness of 3-4I.

On the other hand, the growth of algae and the amount of metal elution were measured for water collected from a pond and left as it was, and for water 1) in which 20 g of Fa was added to the glass and left to stand. However, the samples were left for 24 hours and 48 hours at a constant temperature of 35°C.

The results are shown in Table 2.

Table 2 However, *1 was measured by the same method as in Example 1.

*2 represents the dry weight on the filter paper after absorption filtration.

[Brief explanation of drawings]

1 to 3 are graphs showing the relationship between the number of bacteria and the bacteriostasis time. Further, FIG. 4 is a graph showing the relationship between time and melting amount of soda-based or soda-lime-based glass. (and above) Patent applicant Ubana Co., Ltd.→ Eihaku

Claims (6)

[Claims] (1) A water treatment agent mainly composed of soda-based, soda-lime-based, or (and) phosphate-based glass containing at least one compound capable of releasing heavy metal ions and alkali metal ions. (2) The water treatment agent according to claim 1, wherein the heavy metal ion is a silver ion. (3) The above phosphoric acid glass contains 10-40% by weight of Na_2O, 520-70% by weight of P_2O, and 20-20% by weight of SiO
The water treatment agent according to claim 1 or 2, which is glass mainly composed of 70% by weight and 30 to 30% by weight of B_2O_. (4) The above soda-based or soda-lime-based glass has Na_2
The water treatment agent according to claim 1 or 2, which is a glass mainly composed of 10 to 40% by weight of O, 20 to 80% by weight of SiO, and 30 to 30% by weight of B_2O. (5) In the phosphoric acid glass composition according to item 3, 0 to 50% by weight of at least one of Al_2O_3, CaO, MgO and BaO is added as a dissolution rate regulator. The water treatment agent according to scope 3. (6) In the soda-based or soda-lime-based glass composition described in item 4, SiO_2 is 30 to 70% by weight, Na_2
O is 30 to 40% by weight and B_2O_3 is 0 to
30% by weight or Al_2O_3, MgO, B
5. The water treatment agent according to claim 4, which is a glass having a high melting rate and homogeneous solubility, containing 0 to 20% by weight of at least one of aO and CaO.