JPH0975628A - Water purification device - Google Patents

Abstract

(57) [Summary] [Objective] To provide a water purification device having a structure in which a high gradient magnetic filter for magnetically separating pollutants contained in raw water can be easily removed and replaced with a new one. [Composition] Raw water containing pollutants as magnetic flocs,
The magnetic flocs are adsorbed and purified through a magnetic field applied magnetic filter, and the magnetic filter is backwashed with no magnetic field applied.
A water purification device for regeneration, which is a magnetic separation container 15 for introducing the raw water from below, an air-core coil 16 provided along an outer peripheral side surface of the container 15, and a high-gradient magnetic filter loaded in the container 15. 20, a water conduit 22 provided on the upper side wall of the container 15 for discharging the water treated by the magnetic filter 20, a treated water storage tank 23 for storing the discharged treated water and discharging a part thereof for backwashing, The upper portion of the magnetic separation container 15 has an opening 30 that is large enough to pass through the magnetic filter 20 and is open to the atmosphere.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purifying apparatus for magnetically separating pollutants in raw water, and particularly to a structure of the water purifying apparatus suitable for easily replacing a high gradient magnetic filter used for magnetic separation. Regarding

[0002]

2. Description of the Related Art There is a magnetic separation technology as a conventional purification technology. As a continuous water purification apparatus for sea, river, reservoir, etc., which applies this type of solid-liquid separation technology, Japanese Patent Laid-Open No. 59-371 discloses A magnetic separation device using a gradient magnetic filter is disclosed. In this device, as a pretreatment for the magnetic separation step after the raw water intake, magnetic powder such as ferric tetroxide and a flocculant such as vanadium sulfate containing aluminum or polyaluminum chloride are added to the raw water to be treated. And stir. Thus, solid suspended matter, algae, fungi, which are pollutants in raw water,
Microorganisms are magnetic flocs that become magnetic objects by flocculants.
Then, they are combined to form a large number of colloidal magnetic aggregates having magnetism. These magnetic agglomerates are sucked by the separation unit when passing through the magnetic separation unit and separated from the raw water.

FIG. 2 is a diagram for explaining a system for purifying raw water taken from a reservoir using a magnetic separation technique.
The operation of this system is performed as follows. The raw water of the reservoir 1 is a filter 3 for removing large dust from the water conduit 2.
It is temporarily stored in the raw water storage tank 5 by the pump 4 through this, and the raw water 6 is added with the magnetic powder of triiron tetraoxide and the coagulant such as polyaluminium chloride from the chemical regulator 7 through the conduit 8, and the stirring tank 9 is operated by the motor 10 by the motor 10. Stir with a rotating stirrer 11 to produce pretreated water 12 containing magnetic flocs. The pretreated water 12 flows through the water conduit 14 through the valve 13 into the magnetic separation unit 40.

The magnetic separation section 40 comprises a magnetic separation container 15 for introducing the pretreated water 12 from below, an air-core coil 16 surrounding the side surface of the container 15, a high gradient magnetic filter 20 installed in the container 15, and the filter. Each of the porous magnetic poles 18 covers the upper and lower surfaces of the coil 20, and an iron yoke 19 surrounding the air-core coil 16.

When purifying water by magnetic separation, a DC power source is supplied from the DC power source unit 17 to the air-core coil 16. A magnetic field proportional to the direct current is generated in the cylindrical magnetic separation container 15, the magnetic field is made uniform over the entire surface of the high-gradient magnetic filter 20 by the porous magnetic poles 18 for water passage, and the iron yoke 19 serves as a magnetic field line. It serves as a passage to prevent external leakage of magnetic field lines. The uniform magnetic field magnetizes the magnetic fine wire filler of the high gradient magnetic filter 20, that is, the magnetic wire mesh, the metal wool, and the like. The magnetic field in the magnetic separation container 15 is disturbed due to the magnetized magnetic fine wire filling, and the magnetic flux can be locally densified and dense, and many portions having a high magnetic field gradient are generated. When the pretreated water 12 containing magnetic flocs is fed from below in an upward flow, the magnetic flocs in the raw water are captured by the magnetic fine wire surface of the packing with a large magnetic force, and the purified raw water is treated by the valve 21 as treated water. It is temporarily stored in the treated water tank 23 through the water conduit 22 and returned to the reservoir 1 through the water conduit 24.

After a certain amount of magnetic floe has been captured by the high gradient magnetic filter 20, the filter is backwashed to restore magnetic separation performance. In the backwash, first, the valve 13 is closed, and the supply of the pretreated water 12 is stopped. Next, DC power supply 17
After removing the magnetic field, the treated water stored in the treated water storage tank 23 is allowed to flow backward from the upper portion of the high gradient magnetic filter 20 through the valve 21, and the valve 25 of the backwash drainage storage tank 29 is opened. Also, at this time, the air tank 26 to the valve 27, the conduit 2
While supplying air through 8 to perform air bubbling, the magnetic flocs adhering to the surface of the magnetic fine wire are washed and removed, and the wash water is stored in the backwash drainage storage tank 29. This wash water is separately carried out from the backwash drainage storage tank 29, and is discarded in a landfill or incinerated.

After that, the valve 25 of the backwash water tank 29 and the valve 27 of the air tank 26 are closed, DC power is again supplied to the air-core coil 16 from the DC power supply device 17, and the valve 13 of the stirring tank 9 is opened to perform magnetic separation. To resume.

[0008]

However, when a slender object such as a filamentous algae is entangled in the high gradient magnetic filter and cannot be easily removed by backwashing and accumulates in the filter, the high gradient magnetic filter is magnetically separated. It needs to be removed from the unit, cleaned and replaced with a new filter. The conventional structure has a drawback that the filter cannot be easily removed and replaced because the magnetic separation part is isolated from the atmosphere.

An object of the present invention is to provide a water purifying device which can easily remove and replace the high gradient magnetic filter.

[0010]

In order to achieve the above-mentioned object, the water purification apparatus of the present invention performs a magnetizing treatment on raw water containing pollutants to chemically or physically magnetize the pollutants, The raw water containing the magnetic substance of pollutants is passed through a magnetic filter to which a magnetic field is applied to adsorb the magnetic substance to this magnetic filter for purification, and then backwashed in the absence of a magnetic field to adsorb to the magnetic filter. A water purifying device that regenerates a magnetic filter by removing a magnetic container in which raw water containing a magnetic substance is introduced from below, an electromagnetic coil provided along an outer peripheral side surface of the magnetic container, and a magnetic container Filter installed in the magnetic container, a water conduit provided on the upper side wall of the magnetic container for discharging raw water that has passed through the magnetic filter as treated water, and a part of the treated water discharged from this conduit used for backwashing. A treated water storage tank for storing, is composed of a suspension rod extending upwardly attached to a magnetic filter,
The upper portion of the magnetic container is characterized by having an opening that is large enough to pass through the magnetic filter and is open to the atmosphere.

[0011]

When the magnetic filter needs to be replaced at the end of backwashing, the magnetic filter is taken out through the opening in the upper part of the magnetic container by the hanging rod provided on the magnetic filter and replaced with a new filter, so that the filter can be quickly replaced. Can be exchanged.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The same components shown in FIG. 1 as those shown in FIG.
The same symbols are attached. The magnetic separation part of the water purification apparatus of the present embodiment includes a magnetic separation container 15 as a magnetic container into which the pretreated water 12 is introduced from below through a water conduit 14, a high gradient magnetic filter 20 installed in the container 15, Filter 2
0, the porous magnetic poles 18a and 18b respectively covering the upper and lower surfaces of 0 and having a large number of through holes in the vertical direction, the air-core coil 16 as an electromagnetic coil surrounding the side surface of the magnetic separation container 15, and an iron yoke 19 surrounding the air-core coil 16 from the outside. Is equipped with. Further, an atmosphere open type water tank 31 is provided above the magnetic separation container 15 integrally with the container 15.

The upper opening 30 of the magnetic separation container 15 is open to the atmosphere, and the treated water after passing through the high gradient magnetic filter 20 overflows from the upper opening 30 and the upper part of the magnetic separation container 15 is exposed. Drainage port 3 provided on the side wall of the aquarium 31
It passes through 2 and is stored in the treated water storage tank 23. On the other hand, at the time of backwashing, the air-core coil 16 is demagnetized and the treated water is treated water storage tank 23.
And the air is mixed into the backwash water from the air tank 26 through the supply port 33 provided on the upper side wall of the magnetic separation container 15. When the dust on the high gradient magnetic filter 20 cannot be washed by backwashing and needs to be replaced, the filter suspension 34 is moved upward and the porous magnetic pole 18a and the high gradient magnetic filter 20 supported by this are placed above the magnetic separation unit. The filter is pulled out into the atmosphere through the opening 30, the filter is replaced with a new one, and the upper opening 30 is attached again to the magnetic separator. After that, the air-core coil 16 is excited to restart the cleaning operation.

As described above, according to this embodiment, since the atmospheric opening is provided above the magnetic separation portion, the porous magnetic pole 18a is formed.
At the same time, the magnetic filter 20 can be easily removed from the magnetic separation section in a short time and replaced with a new filter, so that the cleaning operation can be restarted in a short time.

Further, purified water is used for the opening 30 and the water tank 3.
In 1, the free air-liquid interface comes into contact with the atmosphere, so the air dissolves in the treated water and the oxygen-rich treated water can be returned to the water source, which has the effect of preventing the growth of anaerobic bacteria in the water source. .

The raw water described above is water containing impurities such as rivers, dams, lakes, seawater, reservoirs, industrial wastewater, sewage, rainwater, etc. The impurities are organic substances, inorganic substances, microorganisms and the like. Object, metal, non-metal, soil, radioactive material,
For example, metal ions. In particular, divalent iron ions such as ferrous sulfate and alkali are added to raw water containing heavy metal ions to coprecipitate heavy metal ions with the precipitate of ferrous hydroxide, and then oxidized with air to precipitate the precipitates with ferrite. Turn into. This ferritization allows the heavy metal to be magnetically separated. In this case, if the purpose is to separate only the heavy metal ions, the aggregating agent becomes unnecessary. Therefore, in this case, ferrous sulfate, an alkaline solution, and air are injected into the raw water as pretreatment and treated in a stirring tank, and then the pretreated water may be introduced to the magnetic separation unit.

[0017]

According to the present invention, the water purifying device is constructed such that the upper part of the magnetic container for housing the electromagnetic filter for separating the magnetic flocs is opened, and the electromagnetic filter can be suspended from this opening. It can be easily removed from the unit in a short time, replaced with a new filter, and the cleaning operation can be restarted in a short time.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a flow of a purification device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a basic operation flow of a conventional magnetic separation device.

[Explanation of symbols]

 1 Reservoir 3 Filter 4 Pump 4 5 Raw Water Storage Tank 6 Raw Water 7 Chemical Agent 7 (Magnetic Powder, Coagulant) 9 Stirring Tank 11 Stirrer 15 Magnetic Separation Container 16 Air Core Coil 17 DC Power Supply Device 18 Porous Magnetic Pole 19 York 20 High Gradient Magnetic Filter 22 Water conduit 23 Treated water storage tank 26 Air tank 29 Backwash drainage storage tank 30 Opening 34 Lifting tool

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Minoru Morita 502 Jinritsucho, Tsuchiura-shi, Ibaraki Machinery Research Institute, Hiritsu Seisakusho Co., Ltd. Within the corporation

Claims (1)

[Claims] 1. Raw water containing pollutants is subjected to a magnetizing treatment to chemically or physically magnetize the pollutants, and the raw water containing magnetic substances of the pollutants is passed through a magnetic filter to which a magnetic field is applied. In a water purification apparatus for regenerating a magnetic filter by adsorbing a magnetic substance to the magnetic filter to purify the magnetic substance, and removing the magnetic substance adsorbed to the magnetic filter by backwashing without applying a magnetic field. A magnetic container for introducing raw water containing it from below, and an electromagnetic coil provided along the outer peripheral side surface of the magnetic container,
A magnetic filter loaded in the magnetic container, a water conduit provided on the side wall of the magnetic container for discharging raw water passing through the magnetic filter as treated water, and a part of the water discharged from the water conduit for backwashing. It is composed of a treated water storage tank for storing treated water and a hanging rod attached to the magnetic filter and extending upward. The upper portion of the magnetic container has an opening large enough to pass through the magnetic filter and open to the atmosphere. Characteristic water purification device.