JPH03165890A - Water treating agent - Google Patents

Abstract

PURPOSE:To obtain a water treating agent for producing nice drinking water capable of being stored over a long period of time by lowering the pH of seawater with a strong acid, increasing the pH with a strong alkali and firing the resulting precipitate at a high temp. after drying. CONSTITUTION:The pH of seawater is lowered to <=2 with a strong acid, e.g. prepd. by adding concd. sulfuric acid to highly basic ionized water contg. ions of weak acids such as phosphoric acid and silicic acid. The pH is then increased to >=13 with a strong alkali such as NaOH or KOH to precipitate salts whose solubility is reduced at a high pH, e.g. sulfates. The resulting precipitate is dried by heating and fired at a high temp. to obtain activated ceramic-like solid matter. When this solid matter is added to city water, the odor of bleaching powder is removed and nice drinking water is produced. Since this drinking water is kept at pH9-12, the generation of various bacteria is prevented and storage over a long period of time is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to ceramics made by effectively utilizing ions contained in seawater, and particularly to a water treatment agent.

[Problems to be solved by conventional technology and inventions] Generally, tap water is sent to factories and homes with disinfectants added to it, but if the tap water is left as it is, bacteria etc. will grow and the storage property will be poor, making it difficult to store for long periods of time. was impossible. In addition, the chlorinated odor of the disinfectant remained, and even when used as drinking water for tea or coffee, the water tasted bad and residents living near water treatment plants found that it was not suitable for drinking unless a deodorizing agent was used.

The present inventor has long conducted research on methods for utilizing useful elements in seawater, and has discovered and proposed a method for extracting solid elements that are extremely easily contained in seawater (Japanese Patent Laid-Open No. 6
No. 4-47492).

In this method, seawater is adjusted to a low pH with a specified acid, and then the pH is raised to a high pH with a strong alkaline agent to separate the precipitate from the seawater, and then industrially useful substances are extracted from the seawater after the precipitate separation. They have proposed the use of ionized water for food and beverages (Japanese Patent Application No. 1-84534).

However, seawater. Regarding the solid matter that is first obtained as a precipitate when extracting such useful substances from the soil, analysis results have been obtained that show that it contains various elements, but it is difficult to handle as it is in the form of mud. Effective use was not made.

This invention aims to effectively utilize the precipitate containing useful substances in seawater obtained by the seawater separation method proposed by the inventor, and also provides a treatment agent for obtaining drinking water that can be stored for a long time and has good taste. The purpose is to

[Means for Solving the Problems] In order to achieve the above object, the water treatment agent of the present invention adjusts seawater to a low pH with a strong acid, then adds a strong alkaline agent to increase the pH, and removes the precipitates generated at that time. It is made by drying something and then firing it at a high temperature.

Here, as the strong acid, commonly used acids such as sulfuric acid and dilute sulfuric acid can be used, but other anions such as phosphate ions and silicate ions may also coexist. Particularly suitable as the strong acid is one obtained by adding concentrated sulfuric acid to strong base ion water containing weak acid ions such as phosphate ions and silicate ions (JP-A-1-172585, hereinafter referred to as P-S acid). Such a strong acid lowers the pH of seawater to 2 or less, preferably 1.6 or less.

Strong alkaline agents neutralize seawater that has been adjusted to a low pH,
In order to further increase the pH, alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, and alkaline earth metal oxides or hydroxides such as calcium oxide and calcium hydroxide can be used alone. or can be used in combination. A strong alkaline agent containing mainly calcium oxide obtained by burning limestone, shellfish, bones, etc. can also be used.

Seawater is adjusted to pH 13 or higher using these strong alkaline agents.

After lowering the pH with an acid containing sulfate ions,
By raising the pH, salts such as sulfates whose solubility decreases at high pH and low pH precipitate, and a precipitate is obtained.

Although it varies slightly depending on the elemental composition of the precipitate or the acid and alkali used, it is generally as shown in Table 1.

Margin below - 4 - Table 1 As is clear from Table 1, elements such as magnesium, aluminum, boron, iron, copper, and zinc are transferred from seawater to sediment. Incidentally, the precipitate in Table 1 is an analysis result of a mud-like substance before drying.

Such precipitates can be turned into powder by heating and drying under the sun or under reduced pressure. Otherwise, it becomes a granular solid. This solid material itself has no air activity, but becomes activated by high-temperature firing to become a ceramic-like solid material. The firing temperature is about 500°C to 1500°C, preferably 1000°C to 1200°C.

This burnt material is extremely hard and easily soluble in acids, and difficult to dissolve in water, but by leaving it in water, the pH of the water becomes 11.
It is an alkaline substance that raises the temperature up to about 5. Table 2 shows the results of elemental analysis of this burnt material.

Margin Table 2 below (Unit: wt%) In addition, when calcining the precipitate, substances that decompose or disappear by heating, such as easily flammable organic compounds or inorganic compounds that decompose at high temperatures and generate gas, such as sodium carbonate. It may be mixed with and fired. As a result, a porous burning body is obtained. In this case, a uniform fired product can be obtained by adding and mixing the above-mentioned organic compound or inorganic compound to the precipitate in a muddy state before drying, drying it, and then firing it.

Adding a small amount of such burnt material or porous burnt material to tap water removes the chlorine odor and makes it possible to make a drink with good taste. Moreover, since the pH can be maintained at 9 to 12 for a long period of time, the generation of various germs can be prevented and long-term storage becomes possible. This is presumably because the treatment agent added to the water gradually and gently reacts with the water over a long period of time to generate oxygen and prevent the growth of germs.

[Example] 50 g of powder containing calcium phosphate, which is made from calcined animal bones, was dissolved in 1 liter of fresh water to obtain an aqueous solution (1) with a pH of 13 or higher. 5% concentrated sulfuric acid was added to the aqueous solution (1) to produce p-s acid with a pH of 0.2.

The above P-S acid 20Q was added to 1 ton of seawater, left to stand for 3 hours, and impurities were removed by filtration.

This brought the pH of the seawater to 1.6. Next, 30 kg of sodium hydroxide was added to the low-pH seawater to adjust the pH to 13.6.
Floodwater (80Kg specific gravity 1.15) was obtained.

This precipitate was filtered and dried in the sun to obtain about 9 kg of sandy solid (b). Next, this sandy solid (b) is
Fired at 00℃ to form a ceramic-like pebble-like solid (c)
5.4g was obtained.

This solid (c) was added in 1 wt % to tap water and the pH was measured. The results are shown in Table 3.

Table 3 Calcining time: Approximately 1 hour Calcining temperature: Approximately 1000°C In addition, the pH of this solid was added at 0.1 wt% to 1Q of tap water, and then the supernatant was removed and the remaining solid was further added. 1Q of tap water was added and the pH was repeatedly measured, but the tap water maintained alkalinity and showed a good storage condition. The results are shown in Table 4.

Margin below Also, when we added this solid Log to 40Q of tap water and observed the biological system (with two goldfish in it without an air pump), they survived for a long time, but in normal tap water they died within 5 days.

Also, if you add the main ingredient to the bottom of a reservoir, lake, etc. at a rate of about 50,000 liters of the water volume, substances such as sludge due to lack of oxygen at the bottom will be decomposed and fixed on the bottom.

This is thought to be because the treatment agent acts on the water and is decomposed by the oxygen generated, and the water also changes into clear and vital water due to the supply of oxygen.

As another example, if a container containing this solid is attached to a water faucet or the like and tap water is supplied by passing through this solid, the limescale odor is deodorized and a good beverage can be obtained. .

[Effects of the Invention] As is clear from the above explanation, the use of the water treatment agent of the present invention allows water to be kept alkaline for a long period of time, thereby making it possible to preserve water for a long period of time. Therefore, it is possible to preserve water in good condition by using it for disasters, etc., or for stockpiling water for voyages, etc.

It also deodorizes chlorine odor for beverages. You can get something that tastes good.

Claims (1)

[Claims] A water treatment agent characterized in that seawater is adjusted to a low pH with a strong acid, then a strong alkaline agent is added to raise the pH to a high pH, and the precipitate generated at that time is dried and then fired at a high temperature.