JPS5818159B2 - Datsuzan Riyuen Sozai - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a residual chlorine removal agent for water purification, and will be explained in more detail. The present invention provides a granular residual chlorine removal agent using the following methods.

In recent years, in order to remove residual chlorine, unpleasant odors, and unpleasant tastes in city water and obtain high-quality drinking water, adsorbents such as activated carbon are placed in special containers, and chlorinated water is passed through this to remove residual chlorine and various contaminants. There are household water purifiers on the market that remove waste.

In particular, activated carbon is mostly used in commercially available water purifiers as a residual chlorine removal agent, and calcium sulfite is also being considered in some cases.

The reason why activated carbon is used as a residual chlorine removal agent is that it has excellent effects in removing residual chlorine, unpleasant tastes, unpleasant odors, and various impurities contained in city water. Are known.

However, with current commercially available water purifiers that use activated carbon, even if residual chlorine is removed from chlorinated water (if residual chlorine water is retained for a long period of time), general bacteria (miscellaneous germs) will grow in the residual chlorine water.
Water may exceed drinking water quality standards (100 particles/1 cc or less) and become unsuitable for drinking.

The growth of these bacteria is caused by the accumulation of general bacteria in city water or various impurities that serve as a nutrient source for bacteria on the surface or pores of activated carbon over long periods of use, acting as a nutrient source for bacteria, resulting in poor drinking water quality. I think there may be times when it is not possible to meet the standards.

Therefore, as a method for sterilizing the aforementioned germs, it has recently been proposed to focus on precious metal ions, which have a sterilizing effect in extremely small amounts, and to provide sterilization production that uses silver ions in particular. It is preferable not to use the device.

By the way, the present inventors have conventionally made only calcium sulfite, which is effective as a dechlorinator, into granules (granulation molding).
It was used after being heat treated at 0 to 500°C.

If heat treatment is not carried out in this way, granules made from calcium sulfite alone will disintegrate in water and quickly return to their original powder form, eliminating the advantage of making them into granules.
Alternatively, even if heat treatment (250 to 500° C.) is performed, the strength is weak, that is, by immersing it in water for a long period of time, the granulated particles will collapse and a powdering phenomenon will gradually occur.

(However, the powdering phenomenon is small after high temperature treatment).

In order to eliminate such drawbacks, the present inventors have devised a residual chlorine removal agent made by molding a mixture of calcium sulfite and a carbonate that is sparingly soluble in water into granules.

For this molding, the necessary water is added and granulation molded, and after granulation molding, the water content of the granules is simply removed at a temperature of 100°C or less, and there is no powdering phenomenon even if immersed in water for a long period of time. This makes it possible to produce a highly effective residual chlorine removal agent.

Further heat treatment produces even stronger dogs.

In addition, the residual chlorine removal effect is almost the same when compared to calcium sulfite alone, and it has "excellent performance."

Calcium carbonate and magnesium carbonate are particularly effective as carbonates that are poorly soluble in water, and all of them are commonly used as food additives.These two carbonates can be dried at room temperature. However, it has sufficient solidification effect and performance.

Other poorly water-soluble carbonates such as manganese carbonate and carbonic acid can also be used.

Also, in terms of use, cost, effectiveness (strength), performance (
Calcium carbonate is optimal as it has comprehensive properties such as removal of residual chlorine.

However, the composition ratio of calcium sulfite and carbonate, which is sparingly soluble in water, is also important.
The range of is the optimum value from the viewpoint of use (cost, strength, performance).

When the ratio is less than 1:20, that is, when the amount of CaSO3 decreases, the dechlorination performance decreases, and the amount of granular material added must be increased.

On the other hand, if the ratio is 1:1 or more, that is, if the CaSO3 content is increased, heat treatment at 100° C. or higher is required, as in the case of only calcium sulfite.

However, in the range of 1:1 or less (1:10 to 1), the residual chlorine removal effect is almost the same as in the case of using only CaSO3.

This is shown in FIG. In addition, Fig. 1A shows the space velocity, S, V, value 50 (min,,'),
, V-value 30 (mnT'), C is S, V-value 10 (mr
n, 1:), and the space velocity is a sample with a granulation diameter of 1φ and a particle size distribution of 10 to 100 mesh.

Next, a method for producing a residual chlorine removal agent will be explained.

Calbium sulfite powder and carbonate powder that is sparingly soluble in water are first dry heated, enough water is added for pressure molding, wet mixed, pressure molded, and dried to obtain a residual chlorine removal agent. It is something.

An example of this manufacturing method will be described.

) Table 1 below shows various composition ratios of calcilla sulfite and calcium carbonate.

Granule diameter 1φ. Example 2 Table 2 below shows products using calcium sulfite and magnesium carbonate with various composition ratios.

Example 3 Table 3 below shows products using calcium sulfite and manganese carbonate with various composition ratios.

Next, an example of a commercially available water purifier whose performance was confirmed will be described with reference to FIG. 2.

As a commercially available water purifier, PJ-IRF manufactured by the present applicant was used.

In the figure, 1 is the main body 1, 2 is the city water inlet, 3 is the de-residual chlorine water outflow pipe, 4 is the polyethylene cartridge containing the de-residual chlorine acid, 5 is the residual chlorine agent fall prevention filter, 6
7 is a residual chlorine removal agent according to the present invention, and 7 is a filter for removing fine particles generated in a small portion of the residual chlorine removal agent.

. With this configuration, the residual chlorine removal agent according to the present invention was installed in the water purifier, and the residual chlorine removal agent (Example 1) was installed at a flow rate of 4.0 g 7 m.
The /168CaSO3:CaCO3-1,:4 granulation diameter 1φ particle size (10-100 mesh) of Table 1 was added to 200(i) and the results of the study are shown in Table 4.

Space velocity S, V, value (201niR') Based on the above results, by making a granular mixture of calcium sulfite and carbonate that is poorly soluble in water, ■ If powdered CaSOs is used, it will be uniformly distributed on the surface of the filter phase, etc. must be coated with a CaS03 layer.

■ This three-layer coating of powdered CaSO increases filtration blockage.

■ This Ca 803 layer coating has a weak bond with the surface of the filter cloth, and is easily peeled off due to shock, etc., and the duty-free residual chlorine efficiency also deteriorates.

In addition to eliminating the drawbacks of powdered CaSOs such as
The outstanding effects of the granular mixture of the present invention are: (1) Despite being a granular material, it has a large apparent surface area;
This granular layer disperses city water moderately and uniformly, increasing the efficiency of removing residual chlorine.

■ Even though it is a granular material, the minimum amount of CaSO3 is enough to achieve good performance.

■ Compared to CaSO3 alone, it does not disintegrate in water and has greater strength.

■ If only powdered CaCOs is used, for example, when used in a commercially available water purifier, a certain amount is required, and a certain pre-coat thickness is also required, so extra CaSO3 is always required. However, in the case of granular mixtures, if the period of use (total amount of filtrated water) is determined, the amount of sodium can also be determined.

In addition, when the granulation diameter becomes fine (0,5φ, etc.), adding a small amount of magnesium carbonate to calcium sulfite and calcium carbonate allows for fine granulation molding, which has advantages such as improved workability. It has a great industrial effect.

[Brief explanation of the drawing]

FIG. 1 is a composition ratio-residual chlorine removal rate characteristic diagram of the residual chlorine removal agent according to the present invention, and FIG. 2 is a sectional view of a water purifier showing an example of use of the residual chlorine removal agent of the present invention. 1... Body, 4... Polyethylene cartridge, 5... Residual chlorine removal agent fall prevention filter, 6... Residual chlorine removal agent.

Claims (1)

[Claims] 1. A residual chlorine removal agent formed into granules, consisting of two acids: calcium sulfite and carbonate, which are sparingly soluble in water.