JPH0334394B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a heavy metal ion removal device used for water supply pipes made of copper or galvanized steel, or water supply equipment having a copper heat exchanger. Conventional technology Conventionally, copper and galvanized steel have been used as water supply pipes, and copper pipes have been used as heat exchangers for water supply and hot water equipment, but when used in areas with low pH water quality, copper ions and zinc ions (final Occasionally, troubles occurred due to the elution of iron ions). That is, blue water in copper pipes and red water in galvanized steel pipes. Blue water contains eluted copper ions, dirt and sweat,
Blue coloration of towels and bathtubs is caused by a blue insoluble compound (fatty acid copper) produced by reaction with fatty acids in scale, and red water is a red coloration of water caused by rust caused by the disappearance of the zinc plating layer. As a device for suppressing these water quality disturbances, a device shown in FIG. 7 has conventionally been used. This device uses a liquid rust inhibitor (phosphate or silicate).
A pump is used to inject water according to the amount of water supplied.A valve 2 and a flow meter 3 are attached to the pipe 1, and the flow meter 3 senses the flow rate of the supplied water, and a liquid rust preventive agent is injected into the chemical tank in proportion to the flow rate. 4, a control mechanism is attached to the pump 5 for adding water from the valve 2 to the pipe 1. Problems to be Solved by the Invention However, the above configuration requires (1) a control mechanism to adjust the amount of liquid rust preventive added according to the flow rate of water supply, which is expensive and requires handling and maintenance; is complicated. (2) Because it uses a liquid rust preventive agent, it is vulnerable to freezing in winter and has problems such as the need to remove the rust preventive agent. The present invention solves these conventional problems, and has the following advantages: (1) No control mechanism is required (2) Easy handling and maintenance (3)
The purpose of this invention is to provide a low-cost heavy metal ion removal device that is resistant to freezing (4). Means for Solving the Problems In order to solve the above problems, the heavy metal ion removal device of the present invention attaches a partition plate to the inner wall surface of a container having a drain port that can be opened and closed, with gaps provided below and above. A treatment tank is formed, and at least one solid heavy metal ion adsorbent selected from the group () and () below is stored in this treatment tank, and the water flowing into the treatment tank is passed from below the partition plate to the solid heavy metal ion adsorbent. The water flow path overflowed through the heavy metal ion adsorbent. () Magnesium or magnesium alloy. () A compound containing a silicate of at least one element selected from the group of potassium, sodium, magnesium, and calcium. Effects By having the above-described configuration of the present invention, this heavy metal ion removal device does not require a control mechanism, making handling and maintenance easy. Also, by opening the drain port, the water inside the container will flow, making it resistant to freezing. On the other hand, since the gap above the partition plate can be used as a bypass flow path, no clogging occurs even if the water flow path passing through the solid heavy metal ion adsorbent is blocked. In addition, since the solid heavy metal ion adsorbent is a substance with low solubility, it also has a long life. With this heavy metal ion adsorbent, due to the difference in ionization tendency of magnesium or magnesium alloys, heavy metal ions precipitate as heavy metals on the magnesium surface and adsorb and remove them, while silicates of K, Na, Mg, and Ca absorb K ⁺ , Na ⁺ , Mg ²⁺ and Ca ²⁺ are removed through ion exchange, in which heavy metal ions are adsorbed instead of being eluted. Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. FIG. 1 is a cross-sectional view of a heavy metal ion removal apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA' in FIG. The heavy metal ion removal device consists of a box body 6 and a lid body 7, and the box body 6 has an inlet port 8.
It has an outflow port 9 and a discharge port 10 that can be opened and closed.
A processing tank 13 was formed by attaching a partition plate 11 to the inner wall surface of the box 6 with gaps 12a and 12b provided above and below, and a solid heavy metal ion adsorbent 14 was stored in this processing tank 13. Water flows in through the inlet 8 and moves downward through the partition plate 11.
This is a flow path in which water contacts the solid heavy metal ion adsorbent 14 through a gap 12b provided below and overflows from the outlet 9. The solid heavy metal ion adsorbent 14 was filled in a net 15 made of stainless steel, chemical fiber, etc., and stored in the processing tank 13. Also,
The lid body 7 is attached to the box body 6 with bolts 16 and nuts 17.
Air bleed cap (can be opened and closed) fixed to 18
is attached to the lid body 7. Attachment of this air venting cap 18 is optional. In addition, the heavy metal ion removal device has mounts 20a, 20b, 20
It is attached to c, 20d. The following materials are used as the heavy metal ion adsorbent. Magnesium, magnesium alloys (e.g. AZ31 alloy with 96% magnesium - 3% aluminum - 1% zinc, AZ91 alloy with 90% magnesium - 9% aluminum - 1% zinc), zeolite, sodium silicate, potassium silicate, magnesium silicate, silicic acid It is a complex oxide of calcium. These materials are used in the form of granules, lumps, rods, pipes, and threads, but granules are particularly optimal from the viewpoints of excellent heavy metal ion adsorption properties, low pressure loss, and little material outflow. The box and lid are made of stainless steel, polished steel, enameled steel, and painted steel.
A sacrificial anode such as aluminum + magnesium or cathodic protection may be used. FIG. 2 is a cross-sectional view of a heavy metal ion removal device according to another embodiment of the present invention, in which a gasket 19 is used between the box body 6 and the lid body 7, and a gap 1 is formed above the partition plate 11.
2a is provided. Note that although the inflow port 8 and the outflow port 9 are attached to the box body 6, they may be attached to the lid body 7. The most suitable heavy metal ion adsorbent is a magnesium alloy, a compound containing sodium silicate as a main component, or a compound containing potassium silicate as a main component. This is because it has excellent adsorption properties and has a low solubility, so it has a long life, and it has the advantage of being completely dissolved and leaving no residue at the time of death, so clogging is less likely to occur. The effectiveness was evaluated using the heavy metal ion removal apparatus shown in FIG. The heavy metal ion removal device is made of stainless steel and has a cavity with an inner diameter of 20 cm and a height of 52 cm. A stainless steel partition plate (length 46 cm) was attached to the inner wall of this cavity at right angles to the inlet at a distance of 4.5 cm from the inlet with a gap of 1 cm above and 5 cm below. Note that the upper part of the inlet is provided 7 cm below the upper tip of the partition plate. The cavity on the outlet side formed by this partition plate was used as a processing tank, and a solid heavy metal ion adsorbent about the size of soybeans was stored in this processing tank. When water was introduced into this heavy metal ion removal device from the inlet, the water overflowed from below the partition plate via the heavy metal ion adsorbent and formed a water flow path that flowed out from the outlet. Magnesium alloy (Mg96%-Al3%-
Zn1% AZ31 alloy), sodium silicate ( _SiO2 75
%, Na ₂ O 24%, Al ₂ O ³ Fe ₂ O ₃・CaO・K ₂ O・
trace amount of MgO), potassium silicate (SiO ₂ 75%, K ₂ O24
%, trace amounts of Al ₂ O ₃ ·Fe ₂ O ₃ ·CaO · MgO) are shown in FIGS. 4, 5, and 6. It can be seen that both have excellent adsorption and removal performance. The anticorrosion effect of water heating equipment using this heavy metal ion removal device was evaluated using a gas instantaneous water heater.
The gas instantaneous water heater is a model with a hot water supply capacity of size 17, and is configured to obtain hot water by passing through a water tube type (plate fin pipe) heat exchanger made of phosphorus-deoxidized copper. A heavy metal ion removal device was attached to the hot water supply port of this gas instantaneous water heater, and the effectiveness was determined by analyzing the water before and after passing through it. Figure 2 shows the results when using the heavy metal ion removal device shown in Figure 1 containing 8 kg of sodium silicate particles.
Shown in the table. It can be seen that copper ions have decreased.

【table】

[Table] Using hot water obtained from a gas instantaneous water heater, an experiment was conducted to color a towel blue using a soap bar. When a white towel soaked in 0.5% Setsuken solution was soaked in hot water (PH6.3, Cu ²⁺ 0.66ppm) obtained from a conventional water heater (no heavy metal ion removal device), the towel turned blue after 15 repetitions. Summer. On the other hand, even if a white towel soaked in 0.5% soap solution was soaked in hot water (PH8.0, Cu ²⁺ 0.52ppm) obtained from a water heater using the heavy metal ion removal device of the present invention, the results were repeated 15 times. The towels did not turn blue. This is because when the present invention is used, the amount of fatty acid copper (blue compound) produced is reduced due to the reduction of copper ions. In addition, when galvanized steel piping is attached to the hot water supply inlet of a gas instantaneous water heater and the amount of Zn ²⁺ and Fe ²⁺ eluted is measured, it is found that if there is no heavy metal ion removal device,
Zn ²⁺ was 0.05ppm, Fe ²⁺ 0.03ppm, but when a heavy metal ion removal device was installed, Zn ²⁺ was 0.03ppm,
Elution of zinc ions and iron ions was suppressed at Fe ²⁺ 0.02ppm. On the other hand, this heavy metal ion removal device is 5.0/
Even if it was left in an environment of -5°C for one day while flowing water at a flow rate of 10 min, freezing could be prevented by leaving the drain port open and discharging a small amount of water from the heavy metal ion removal device. Furthermore, even if the gap below the partition plate is closed and the gap becomes clogged, water will overflow from above the partition plate, proving that the device is resistant to clogging. Effects of the Invention As described above, the heavy metal ion removal device of the present invention has a drain port that can be opened and closed on the inner wall surface of the device.
A treatment tank is formed by attaching a partition plate with a gap between the bottom and the top, and the solid heavy metal ion adsorbent is stored in the treatment tank, and the water flowing into the treatment tank absorbs the solid heavy metal ion adsorbent from below the partition plate. (1) No control mechanism is required, making the heavy metal ion removal device easy to handle and maintain. (2) By opening the drain, the water inside the container will flow and will not freeze. (3) Since the gap above the partition plate can be used as a bypass flow path, no clogging will occur even if the water flow path passing through the solid heavy metal ion adsorbent is blocked. (4) The solid heavy metal ion adsorbent is () magnesium or magnesium alloy, () potassium, sodium, magnesium,
Since it is a compound containing silicate of one or more elements selected from the group of calcium, it has low solubility and long life. Furthermore, since it uses elemental components that are naturally present, it is highly safe for health.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a heavy metal ion removal device that is an embodiment of the present invention, and Figure 2 is
AA′ line sectional view, FIG. 3 is a sectional view of a heavy metal ion removal device which is another embodiment of the water invention, FIG. 4 is an effect characteristic diagram of the present invention, FIG. 5 is an effect characteristic diagram of the present invention, and FIG. The figure is an effect characteristic diagram of the present invention, and FIG. 7 is a block diagram of a conventional heavy metal ion removal apparatus. 8... Inlet, 9... Outlet, 10... Drain port, 11... Partition plate, 12a, 12b... Gap,
13...Treatment tank, 14...Heavy metal ion adsorbent.

Claims (1)

[Claims] 1. On the inner wall surface of a device having a drain port that can be opened and closed,
A processing tank is formed by attaching a partition plate with a gap at the bottom and top, and the following () () are installed in this processing tank.
At least one solid heavy metal ion adsorbent selected from the group is stored, and the water flowing into the treatment tank overflows from below the partition plate via the solid heavy metal ion adsorbent as a water flow path for heavy metal ion removal. Device. () Magnesium or magnesium alloy. () A compound containing a silicate of at least one element selected from the group of potassium, sodium, magnesium, and calcium. 2. The heavy metal ion removal device according to claim 1, wherein the solid heavy metal ion adsorbent is at least one selected from the group of compounds whose main components are magnesium alloy, sodium silicate, or potassium silicate. 3. The heavy metal ion removal device according to claim 1, wherein the solid heavy metal ion adsorbent is granular.