JPH09271757A - Water treating device and treating method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively reduce and remove harmful metals such as As an Pb, from raw water containing these harmful metals. SOLUTION: In a water treating device provided with a filter layer having at least one layer of granular ceramics deposited in a cylindrical housing 10 having a water inflow port 12a and an outflow port 13a respectively at an end and the other end and being arranged respectively at least one piece of magnet 41 at the upper and lower positions of the granular ceramic layer 26 such that the directions of the magnetic lines mutually coincide and the directions of the magnetic lines are along the flow of the water, the harmful metals in raw water are reduced and removed by allowing the water to pass through the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing harmful metals contained in drinking water, especially groundwater.

[0002]

2. Description of the Related Art In recent years, there has been a call for deterioration in water quality. Especially in areas where groundwater is used as drinking water, some areas are not suitable for drinking because they contain harmful metals. Since the water quality standards became stricter in 1994, the areas of non-conformity for arsenic and lead have spread and become a big problem. However, at present, no harmful metal removal device having an appropriate treatment capacity has been developed.

[0003]

In view of the above situation, what the present invention intends to solve is to effectively reduce and remove harmful metals from raw water containing harmful metals such as arsenic and lead. Another object is to provide a water treatment device and a treatment method therefor.

[0004]

In order to solve the above problems, the present invention provides at least one layer of granular ceramics in a cylindrical housing having a water inlet and a water outlet at one end and the other end, respectively. In a water treatment device comprising a filtration layer formed by stacking and arranging at least one magnet above and below the granular ceramic layer so that the directions of the magnetic lines of force coincide with each other and the directions of the lines of magnetic force follow the flow of water. The present invention provides a water treatment device characterized by reducing and removing harmful metals in raw water by conducting water treatment.

Further, according to the present invention, an oxidizer is added to raw water containing arsenic using the above-mentioned water treatment device, and then water is passed through the water treatment device to reduce and remove arsenic. A water treatment method is provided.

According to the present invention, when raw water containing harmful metals is passed through, the concentration of harmful metals in the treated water can be reduced. Therefore, the water treatment device of the present invention is used as a treatment device for the groundwater or simple waterworks used for the purpose of obtaining drinking water when the harmful metal concentration exceeds the tap water quality standard. Also,
It can also be applied to industrial wastewater equipment containing harmful metals.

There are various kinds of harmful metals that can be removed by the present invention. Specifically, lead, cadmium, arsenic, and mercury listed in regulatory items such as tap water quality standards and water quality environmental standards (including monitoring required items). , Chromium, manganese, iron, copper, zinc, molybdenum, nickel, antimony, etc. Among these harmful metals, the effect of removing lead and arsenic, which has become a problem in recent years, is remarkable.

As for arsenic, the removal performance is further improved by adding an oxidizing agent to water to form pentavalent ions. Various oxidizing agents can be used as the oxidizing agent in this case, but sodium hypochlorite, hydrogen peroxide and the like are particularly preferable.

When the concentration of harmful metals in the raw water is high, it can be dealt with by lowering the treatment speed, that is, the empty cylinder velocity, or by repeating the water passage treatment. 1ppm or less is 1
It is a concentration that can be removed by one pass of water. In raw water with these harmful metal concentrations, the concentration after lead-through treatment is 5 for lead.
It can be reduced to 0 ppd or less and 10 ppd or less in the case of arsenic.

If the processing speed, that is, the empty cylinder speed, is too fast, the removal is insufficient, and if it is too slow, the processing capacity becomes lower than the size of the apparatus, which is not preferable. In particular,
30 to 5000 hr ⁻¹ is preferable, and particularly 50 to 3000
hr ⁻¹ is more preferable.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the essential part of one embodiment of a water treatment apparatus of the present invention, that is, a filtration layer.
0 is a housing, 21 is a first sand layer, 22 is an activated carbon layer,
23 is the second sand layer, 24 is the Taiseki stone layer, 25 is the first magnetite layer, 26 is the ceramic layer, 27 is the second magnetite layer, 28 is the barite layer, 31 is a perforated filter, 32 is Nonwoven fabric filter, 33 is a partition net, 41 is a magnet, 40-
1, 40-2 and 40-3 are magnet plates.

The housing 10 has a cylindrical body 11, a cap 12 having a water inlet 12a and a water outlet 1.
It is composed of a cap 13 having 3a, and a cap 12 and a cap 13 are attached to one end and the other end of the main body 11, respectively.

The first sand layer 21 and the second sand layer 23 are layers of white sand obtained by specially treating igneous rock Shirasu, and the activated carbon layer 22 is a layer of granular activated carbon. By these, residual chlorine, organic substances, harmful substances (eg trihalomethane), red rust, impurities, musty odor, etc. are mainly removed. Further, the Taiseki stone layer 24 and the barley stone layer 28 are formed by depositing fine pieces of the Taiseki stone and the barley stone respectively in layers, and mainly adjust water quality (pH and the like) and supply minerals. The activated carbon layer 22 is not limited to granular activated carbon, and fibrous activated carbon can be used as appropriate.

The first magnetite ore layer 25 and the second magnetite ore layer 27 are formed by depositing pieces of magnetite ore in layers.
It is magnetized by the magnetic field of a magnet, which will be described later, and removes harmful metals and magnetizes water molecules to activate them. The ceramic layer 26 is formed by layering granular ceramics obtained by specially treating white sand obtained by specially treating igneous rock shirasu at a higher temperature (for example, 1100 ° C.), activating water molecules by far-infrared irradiation and deteriorating water quality. Prevent.

The perforated filter 31 is made of a plastic plate having a large number of fine holes formed on almost the entire surface thereof, and separates and holds the above-mentioned layers together with a well-known nonwoven fabric filter 32 and a partition net 33.

All of the magnet plates 40-1 to 40-3 have the same structure, and fix three coin-shaped magnets 41, and from a plastic plate or the like provided with a large number of fine holes (not shown) on substantially the entire surface. Become All magnets 4
1 is a position obtained by equally dividing the central angle on the same circle about the central axis of the housing 10 (here, the central angle 12
It is held at 0 ° in three equal parts). The magnet 61 is a strong magnet (for example, residual magnetic flux density 12000 gauss) whose surface is coated with plastic or the like, and is magnetized in the axial direction.

Thus, in the main body 11 of the housing 10, the layers, filters and plates described above are denoted by reference numerals 31, 32, 21, 32, 33, from the top to the bottom.
22, 32, 40-1, 32, 23, 32, 33, 2
4, 33, 32, 25, 32, 40-2, 26, 33,
32, 27, 32, 40-3, 28, 32, 31 are stacked in this order to form a filtration tank. At this time, the magnet plates 40-1 to 40-3 are attached to the magnet plate 4
0-1 and 40-2 spacing and magnet plate 40-
2 and 40-3 are substantially equal to each other, and the positions of the magnets 41 are aligned in the vertical direction, and the magnet plates 40-1 to 40-3 are positioned.
All of the magnets 41 are arranged such that their magnetic lines of force coincide with each other, in particular, so that they are opposite to the flow of water, and the directions of the lines of magnetic force are along the flow of water.

According to this filtration tank, the magnetic lines of force of the magnets 41 of the magnet plates 40-1 to 40-3 are combined with each other to reinforce each other, particularly upward, that is, along the flow of water and in the opposite direction. Since a uniform and strong magnetic field 42 is formed and the magnetic field 42 strongly magnetizes the entire first magnetite ore layer 25 and the second magnetite ore layer 27, water molecules are generated in the magnet plate 40-1 and the magnet plate 40-1. 40
-3, particularly when passing through the first magnetite ore layer 25 and the second magnetite ore layer 27, the magnetizing treatment is effectively performed. Further, since the magnetic field generated by the magnetic field 42 and the first magnetite ore layer 25 and the second magnetite ore layer 27 magnetized by the magnetic field 42 passes through the ceramic layer 26, harmful metals contained in the raw water are removed.

[0019]

【Example】

(Example 1) About 60% arsenic acid solution (Wako Pure Chemical Industries reagent grade 1) was added to distilled water in an amount of 0.01 mg / L in the above water treatment device.
And water adjusted to have an arsenic concentration of 0.02 mg / L as raw water were passed by a pump at 4.2 L / min (empty speed 240 hr ⁻¹ ) to analyze the arsenic concentration after the treatment. As a result, the arsenic concentration of the treated water was 0.001 mg / L at both concentrations.

(Example 2) As in Example 1, 1000 mg / L of an ICP standard solution (nitric acid: manufactured by Aldrich) was added to distilled water as an arsenic aqueous solution to obtain an arsenic concentration of 0.011 mg.
/ L, and a solution of about 5% sodium hypochlorite (manufactured by Kanto Kagaku) was added to give a concentration of 1.0 mg / L to prepare raw water. This raw water was passed by a pump at 4.2 L / min (empty cylinder speed 240 hr ^-1 ),
The arsenic concentration after the treatment was analyzed. As a result, the arsenic concentration of the treated water was less than 0.001 mg / L.

(Example 3) In the same manner as in Example 1, 1000 mg / L of a standard solution for ICP (nitric acid: manufactured by Aldrich) as a lead aqueous solution was added to distilled water to obtain a lead concentration of 0.031 mg / L.
L and 0.068 mg / L were adjusted, and water was passed by a pump at 4.2 L / min (empty cylinder speed 240 hr ⁻¹ ) to analyze the lead concentration after the treatment. As a result, the lead concentration of the treated water was less than 0.005 mg / L.

[0022]

According to the water treatment apparatus and the treatment method thereof of the present invention as described above, it is possible to effectively reduce and remove these harmful metals from raw water containing harmful metals such as arsenic and lead. This is especially effective when groundwater is used as drinking water.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a water treatment device of the present invention.

[Explanation of symbols]

 10 Housing 11 Main Body 12 Cap 12a Inlet 13 Cap 13a Outlet 21 First Sand Layer 22 Activated Carbon Layer 23 Second Sand Layer 24 Taisekiseki Layer 25 First Magnetite Ore Layer 26 Ceramic Layer 27 Second Magnetite Ore Layer 28 Barley Stone layer 31 Perforated filter 32 Nonwoven fabric filter 33 Partition net 40-1, 40-2, 40-3 Magnet plate 41 Magnet 42 Magnetic field

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Claims (6)

[Claims] 1. At least one layer of granular ceramics is deposited in a cylindrical housing having a water inlet and a water outlet at one end and the other end, respectively, and at least one magnet is provided above and below the granular ceramics layer. In a water treatment device equipped with a filtration layer in which the directions of magnetic lines of force match each other and the directions of the lines of magnetic force are arranged along the flow of water, water is treated to reduce harmful metals in raw water. A water treatment device characterized by the above. 2. The water treatment apparatus according to claim 1, wherein a layer of magnetite ore is interposed on at least one of the upper and lower sides of the layer of granular ceramics. 3. The water treatment apparatus according to claim 1, wherein the harmful metal is lead, and the lead content of the water after the water passage treatment is reduced to 50 ppb or less. 4. The water treatment apparatus according to claim 1, wherein the harmful metal is arsenic, and the content of arsenic in the water after the water passage treatment is reduced to 10 ppb or less. 5. Water passing treatment is performed for 50 hr ^-1 to 3000 hr.
The processing method according to claim 1, 2, 3 or 4, wherein the processing is performed at an empty cylinder speed (SV) in the range of ^-1 . 6. At least one layer of granular ceramics is deposited in a cylindrical housing having a water inlet and a water outlet at one end and the other end, respectively, and at least one magnet is provided above and below the granular ceramics layer. After adding an oxidizer to raw water containing arsenic using a water treatment device equipped with a filter layer in which the directions of the magnetic lines of force coincide with each other and the directions of the lines of magnetic force are arranged along the flow of water, A water treatment method characterized in that arsenic is reduced and removed by passing water through a water treatment device.