JPS58143892A - Method of making potable water by removal of ion from permanent hard water - Google Patents

Abstract

PURPOSE:To enable to use sulfuric ion-contg. permanent hard water as potable water, by adding powdery barium carbonate to said hard water and agitating the hard water to precipitate and separate Ca, Mg and sulfuric ions as carbonates and barium sulfate. CONSTITUTION:The sulfuric ion-contg. permanent hard water, i.e. mining or volcanic water, is mixed with powdery BaCO3 and agitated for a proper time. Cations such as Ca and Mg in the permanent hard water are deposited and precipitated as carbonates such as CaCO3 and MgCO3. Sulfuric ion as an anion is reacted with Ba in the barium carbonate, and deposited and precipitated as BaSO4. These precipitates are removed by solid-liquid separation such as filtration, so that the permanent hard wate is refined into water which can be used as potable water.

Description

[Detailed description of the invention] The water supplied by the water supply system must meet certain standards according to the water supply law established by the country. (1) Water containing calcium and magnesium as corresponding cations is called permanently hard water (8) Depending on the content, the hardness and evaporation residue may exceed national regulation values and become unfit for drinking. There are cases.

According to national regulation values) Calcium, magnesium, etc. (hardness) SOOmgy'72 or less, evaporation residue 600■
In order to reduce the hardness of water that exceeds the regulated value of 4 or less, K is 1. Currently, the commonly considered method is to use ion exchange resins ＼ cations such as calcium and magnesium. This is a method in which sodium ions are substituted for sodium ions.

According to this method, it is possible to lower the hardness, but due to the presence of S-substituted sodium ions, the amount of evaporation residue increases, albeit in a small amount.

In order to reduce this M residue, there is no suitable method other than removing both the anion and cation using an ion exchange resin. The water obtained in this way is called pure water from which all anions and cations, including the aforementioned calcium, magnesium, sodium, potassium, and chlorine, have been removed, and it is considered unsuitable for drinking water. There is.

In the present invention, powdered barium carbonate is used to remove calcium-magnesium and sulfate ions, calcium-magnesium is used as carbonate, sulfate ions are precipitated as barium sulfate, and iron is also co-precipitated at the same time, so these are separated into solid-liquid. You can get drinking water.

In addition, in this method, sodium, potassium, S, chlorine, etc. are not precipitated, so that drinking water containing a suitable amount of ions can be obtained.

Example ! Table 1 shows the analytical values of the water obtained by adding 2 g of powdered barium carbonate to 15 ml of raw water, stirring for 15 hours and 8 hours, and filtering the resulting precipitate.

Example 3 Using another raw water, 5 g of powdered barium carbonate was added to the raw water 1i2 and tested in the same manner as in Example 1. The results are shown in Table 2.

Table 1 Table 2 As in the above example, water suitable for drinking water could be obtained by using powdered barium carbonate in an amount equivalent to about 1 times the amount of sulfate ions in the raw water.

According to this method, it is possible to produce water suitable for drinking by treating water containing permanently hard water that is unfit for drinking, such as well water in areas where tap water is not readily available.

(3) Patent applicant: Ishi 1) Takashi Yu 474-

Claims (1)

[Claims] Mineral or volcanic water is permanently hard water that contains sulfate ions, and powdered barium carbonate is added and stirred.
A method of producing drinking water by precipitating magnesium carbonate and barium sulfate and separating them into solid and liquid.