JPH0592104A - Molded inorganic coagulant for water treatment and preparation of the same - Google Patents

Abstract

(57) [Summary] [Purpose] A sulfuric acid band is molded into tablets, which are gradually dissolved at the required dissolution time, and the impurities in pool water are aggregated to achieve the optimum concentration, which is reliably filtered in a filtration tank to ensure that the pool The purpose is to improve water quality. [Composition] A suitable amount of water is added to a powdered inorganic coagulant such as a powdered sulfuric acid band, or a powdered inorganic coagulant and a polyaluminum chloride solution are mixed, and an appropriate amount of water is added thereto, and the mixture is heated and dissolved.
A part of the added water is evaporated, and this is cooled and solidified in a mold to mold a molded inorganic coagulant for water treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded inorganic coagulant for water treatment, which is used for purifying water in a filter such as a pool or a water treatment device for coagulation and sedimentation, and a method for producing the same.

[0002]

2. Description of the Related Art Sulfuric acid band is a typical inorganic flocculant used for water treatment, and 8% solution and powdered ones are commercially available. As a filtering device for the pool, a pump and a dissolution tank are provided in the middle of the circulation path between the pool and the filtration tank, and an 8% solution is injected into the circulation path by a metering pump or a predetermined amount is measured by measuring the powder with a meter. The suction is performed from the inflow side of the pump, and coagulation filtration is performed in the filtration tank.

[0003]

In the case of injecting 8% sulfuric acid band solution with a metering pump among those described in the prior art, not only when trouble occurs due to mechanical failure, but also by forgetting to stop the pump, the solution If too much is injected, it will pass through the filter as it is, causing the trouble of clouding the pool water.

Further, when the powdered sulfuric acid band is put into use, the make-up water of the dissolution tank is always put from the discharge side of the pump, so that the powdered sulfuric acid band is easily mixed with the make-up water in a large amount at the beginning. There is a considerable difference in concentration between the beginning and the end. Therefore, when the amount of sulfuric acid band is large, PH6 that is suitable for aggregation at the beginning when mixed with pool water is used.
PH is too low from the range of ~ 8 and impurities do not aggregate,
As it passes through the filtration tank and flows out into the pool to form flocs, flocs settle at the bottom of the pool. It may take considerable effort to remove the flock.

The powdered sulfuric acid band was injected into the pool water within a few minutes at the beginning, and after that, since there was not an appropriate amount, aggregation failure often occurred and the turbidity of the pool water was often not removed. Further, in the case of the powdered sulfuric acid band, since the concentration was high at the beginning, it was likely to adhere to the impeller of the pump and there was a problem of scale formation. Further, in the case of the powdered sulfuric acid band, there was a problem that the powder put in was partially solidified at the bottom of the dissolution tank and remained undissolved.

According to the present invention, a molded inorganic coagulant is formed by molding a sulfuric acid band into a tablet, which is not dissolved at once like a powder, and is gradually dissolved for a required dissolution time to allow water treatment. It aims at providing the manufacturing method.

[0007]

In order to achieve the above object, the molded inorganic coagulant for water treatment of the present invention is prepared by adding an appropriate amount of water to a powdered inorganic coagulant such as a powdered sulfuric acid band and heating and dissolving it.
A part of the added water is evaporated, and this is cooled and solidified in a mold to form a tablet.

Further, a polyaluminum chloride solution was placed in a powdered inorganic coagulant such as a powdered sulfuric acid band, and an appropriate amount of water was added to the solution to dissolve it by heating, and then a part of the added water was evaporated, and this was cooled and solidified in a mold. Mold into tablets.

As a method for producing the molded inorganic coagulant of the present invention, about 40 g of water is added to 200 g of powdered inorganic coagulant such as a powdered sulfuric acid band.
After heating and dissolving, about 20 g of water is evaporated, and this is poured into a mold to cool and solidify.

Or powdered inorganic coagulant 16 such as powdered sulfuric acid band
About 40 g of polyaluminum chloride solution was added to 0 g, about 20 g of water was added thereto, and after heating and dissolving, about 20 g of water was evaporated, and this was poured into a mold to be cooled and solidified.

[0011]

The function of the molded inorganic coagulant of the present invention is to add water or the like, heat and dissolve it once, and then evaporate a part of the water to adjust the water content, and then mold this into a tablet form. The molded coagulant does not dissolve at once when used in a dissolution tank,
Since it can be gradually dissolved in makeup water and relatively uniformly injected into the pool water over a required time, it is possible to maintain the PH at the time of mixing with the pool water at an optimum PH of 6 to 8 for aggregation, It is possible to reliably remove the flocs in the filtration tank and improve the quality of the pool water.

[0012]

EXAMPLE FIG. 1 shows an example of a method for producing a molded sulfuric acid band coagulant for water treatment. When one molded sulfuric acid band coagulant of about 200 g is manufactured, 200 g of powdered sulfuric acid band coagulant is produced.
40g as an appropriate amount of water to 110 to 120
After dissolving by heating at ℃, add a part of water, eg 20g
Is evaporated to adjust the water content, poured into a mold, cooled, and solidified to a hardness such that it can be dissolved in a required dissolution time, for example, about 80 minutes. The molded sulfuric acid band coagulant 1 is molded.

The powdered sulfuric acid band of the above example was slightly reduced, and instead, a polyaluminum chloride solution (PAC) was used.
It is also possible to mix the above and add water to this for molding. That is, in the same manner, when producing a molded sulfuric acid band coagulant of about 200 g per piece, 160 g of powdered sulfuric acid band is mixed with 40 g of polyaluminum chloride solution, and about 20 g of water is added thereto.
After dissolving by heating at 110-120 ℃, added water about 20
It is also possible to evaporate g and mold in the same manner as above. Of course, it is possible to change the mixing ratio of the powdered sulfuric acid band and the polyaluminum chloride solution, which makes it possible to take advantage of the polyaluminum chloride solution (PAC). That is, if the mixing of PAC is increased, the decrease of PH can be reduced. Other inorganic flocculants such as ferric chloride and polyiron can also be used.

The shape of the molded sulfuric acid band coagulant 1 is not limited to the above-mentioned one, and the desired shape can be freely adopted, and the amount thereof is 20 g, 100 g, 2 depending on the application.
It is preferable to prepare an appropriate amount such as 00 g and display the amount on the surface of the tablet.

In FIG. 3, 2 is a pool, 3 is a filtration tank, 4 is a normal circulation path for pool water, and P is a pump provided in the normal circulation path 4.
Turn the pool water around. Reference numeral 5 is a dissolution tank for dissolving an appropriate number of molded inorganic coagulants 1, and a water supply passage 6 is provided from the outflow side of the pump P, and the water level of the supply water of the dissolution tank 5 is adjusted with a ball tap 7 An inflow passage 8 is provided in which the molded inorganic coagulant 1 is gradually dissolved therein and makeup water containing the dissolved inorganic coagulant is introduced from the dissolution tank 5 to the inflow side of the pump P.

In the embodiment, the case of using it for the pool filtration device has been described, but the present invention is not limited to this, and it is also possible to use it for a coagulation sedimentation water treatment device.

If the required number of tablet-shaped molded inorganic coagulants molded by the manufacturing method of the present invention are put into the dissolution tank 5 in accordance with the amount of pool water, the dissolved inorganic coagulant is gradually dissolved in the makeup water and the pump P is used.
Is sucked toward the inflow side by mixing with the pool water of the normal circulation path 4 from the pool 2 to aggregate impurities as the optimum PH 6 to 8, the flocs are filtered in the filtration tank 3, and clean water is supplied to the pool.

[0018]

EFFECTS OF THE INVENTION The molded inorganic coagulant formed into tablets of the present invention is obtained by adding water to a powdered inorganic coagulant, heating and dissolving it once, and then evaporating a part of water and the like to solidify it. The solution can be gradually dissolved at a desired dissolution time, for example, 80 minutes. Moreover, since this molded inorganic coagulant is not completely dissolved in water when dissolved by simply solidifying the powdered inorganic coagulant with pressure, it is necessary to add water to the powdered inorganic coagulant such as a powdered sulfuric acid band and heat and dissolve it once. Since it is solidified, it can be completely dissolved in water.

Further, as described above, since it is gradually dissolved as a tablet, it can be supplied to the pool water relatively uniformly,
Therefore, since the optimum pH of 6 to 8 can be maintained, the flocculation can be stabilized, and the flocs can be reliably stopped in the filtration tank to improve the water quality of the pool. Therefore, the trouble that the flocs go out directly to the pool as in the past cannot occur at all. Moreover, the tablets do not suddenly become highly concentrated because they gradually dissolve out over a period of, for example, 80 minutes, and therefore, adhesion to the impeller of the pump and scaling can be greatly reduced.

Further, the molded inorganic coagulant is 20 g, 100
If you prepare tablets with different amounts of g, 200g, etc., and display the amount on the tablets, you can input the required amount depending on the number of tablets without weighing, and thus there is an error such as excessive injection as in the past. You can get rid of it. Further, since PH does not become acidic when mixed with pool water, it is possible to prevent corrosion of pipes, tanks and the like.

[Brief description of drawings]

FIG. 1 is a block diagram showing a method of manufacturing a molded inorganic coagulant according to the present invention.

FIG. 2 is a perspective view showing an embodiment of the molded inorganic coagulant of the present invention.

FIG. 3 is a schematic diagram showing a pool filtration device.

[Explanation of symbols]

 1 Molded inorganic coagulant 2 Pool 3 Filtration tank 5 Dissolution tank

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[Procedure amendment]

[Submission date] September 10, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Title: Molded inorganic coagulant for water treatment and method for producing the same

Claims (4)

[Claims] 1. An appropriate amount of water is added to a powdered inorganic coagulant such as a powdered sulfuric acid band to dissolve by heating, and then a part of the added water is evaporated.
Molded inorganic coagulant for water treatment, which is formed by cooling and solidifying in a mold. 2. A polyaluminum chloride solution is placed in a powdered inorganic coagulant such as a powdered sulfuric acid band, and an appropriate amount of water is added to the solution to heat and dissolve it, and then a part of the added water is evaporated, and this is cooled and solidified in a mold. Molded inorganic coagulant for water treatment. 3. A powdered inorganic coagulant 20 such as a powdered sulfuric acid band.
About 40g of water was added to 0g, and after heating and dissolving, about 20g of water was added.
A method for producing a molded inorganic coagulant for water treatment, which comprises evaporating g and pouring it into a mold to solidify by cooling. 4. A powdered inorganic coagulant 16 such as a powdered sulfuric acid band.
About 40 g of polyaluminum chloride solution was added to 0 g, about 20 g of water was added to it, and dissolved by heating, about 20 g of water was evaporated, and this was poured into a mold to be cooled and solidified. Method for producing flocculant.