JP2000117142A - Superconductive magnetic separation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the separating and removing efficiency of heavy metal ions from a waste soln. and to reduce running cost by the reduction of the adding amt. of magnetic particles to suspended particles and the reduction of the generation amt. of sludge. SOLUTION: An ozone injection apparatus 12 forcibly subjecting metal ions contained in a waste soln. to oxidation treatment by the injection of ozone to form insoluble oxide particles, a flocculation treatment apparatus 13 flocculating suspended matter such as org. matter or the like or oxide particles contained in the waste soln. to form flocculated particles and a magnetic filter 14 forming a strong magnetic field space by a superconductive solenoid magnet to catch particles contained in the waste soln. are arranged to a waste soln. supply piping 11 supplying the waste soln. continuously. By this constitution, both of heavy metal components and suspended components such as org. matter are collectively or indivisually caught from the waste soln. by a magnetic filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting magnetic separation system for purifying industrial wastewater, sewage and other various wastewaters by utilizing magnetic attraction, and more particularly to a wastewater containing suspended particles such as heavy metal ions and organic substances. And a superconducting magnetic separation system capable of separating and removing both of these components.

[0002]

2. Description of the Related Art Conventionally, as a means for separating and removing suspended particles such as organic substances and minerals contained in factory waste liquid and the like, superconducting magnetic separation in which separation and removal are performed using ferromagnetic or weak magnetism of suspended particles. Devices are known. That is, a gradient magnetic field is applied to the waste liquid containing the suspension, and the suspended particles are separated by magnetic attraction based on the gradient magnetic field. In this case, since the magnetic attraction given to the suspended particles is proportional to the magnitude of the magnetic field gradient and the volume of the suspended particles, a high gradient magnetic separation method using a superconducting solenoid magnet is employed.

FIG. 4 shows a conventional superconducting magnetic separator according to such a system. As shown in FIG. 4, the superconducting magnetic separation apparatus has a waste liquid pipe 1 for supplying a waste liquid a.
A processing cylinder 3 having a filter unit 2 is provided, and a superconducting solenoid magnet 4 is arranged on the outer peripheral side of the processing cylinder 3.
The superconducting solenoid magnet 4 is configured to generate a magnetic field of, for example, 3 stellas to 10 stellas, and the filter unit 2 is configured to stack a mesh of ferromagnetic wires having a diameter of several tens to several hundreds of microns. The processing tube 3 has a vertically long configuration, and the lower end is connected to the waste liquid supply pipe 1 and the upper end is connected to the outlet pipe 5. A catch discharge pipe 6 is connected to the lower end of the processing tube 3 so as to be separated from the waste liquid supply pipe 1. Further, the outlet pipe 5
Is connected to a cleaning pipe 7. A flow control valve 8 is provided near the branch of each of the pipes 1, 5, 6, and 7.

Waste liquid a containing suspended particles b having magnetism
Is supplied from the supply pipe 1 to the processing tube 3. The waste liquid a supplied to the processing tube 3 receives a strong magnetic attraction based on the gradient magnetic field generated by the superconducting solenoid magnet 4 when passing through the filter unit 2, and the suspended particles b are adsorbed and captured by the filter unit 2. And separated and removed from the waste liquid a. Treatment liquid c from which suspended particles b are separated and removed
Is discharged from the outlet pipe 5 through the upper part of the processing tube 3. Then, after a predetermined amount of trapping action, the suspended particles b
Recovered from.

When the suspended particles contained in the waste liquid contain a large amount of non-metallic substances such as organic substances and mineral components, these cannot be separated and removed by direct magnetic attraction. Therefore, in such a case, a small amount of magnetic particles and a flocculant are first introduced into the waste liquid, thereby forming an aggregate (magnetic floc) having the magnetic particles as nuclei. Then, a magnetic attraction is applied to the waste liquid containing the magnetic flocs to remove suspended components as magnetic flocs.

On the other hand, in many cases, the improved waste liquid contains a heavy metal component such as iron, zinc, or manganese as metal ions. Regarding such heavy metal ions in the waste liquid, even if a high gradient magnetic field is directly applied, a magnetic attraction large enough to withstand the fluid resistance cannot be generated. Therefore, conventionally, a method of performing magnetic separation after applying a treatment for producing a compound with ferrite or the like is generally employed.

[0007]

However, in the above-mentioned conventional means, in order to efficiently remove non-magnetic suspended particles by a magnetic separation effect, it is necessary to sufficiently add magnetic particles in the former stage. In order to generate a particularly large magnetic attraction, a technique of adding iron powder or the like for the purpose of magnetic seeding to grow a magnetic floc in a large size has been adopted. In this case, the amount of sludge generated after the magnetic separation is increased, and a correspondingly large amount of post-treatment is required, which raises a problem that the running cost is increased.

[0008] Separation of heavy metal ions requires a separate pretreatment for insolubilization as a compound by the addition of ferrite or the like, resulting in low treatment efficiency, and the treatment necessarily produces a sufficiently large magnetic attraction. The separation efficiency was low, for example, it could not be generated.

Furthermore, when it is desired to treat both suspended particles and heavy metal ions at once, it is not possible to carry out the treatment efficiently, and conversely, it is not easy to separate and recover an organic component and a metal component. There was also difficulty in reusing them by their recovery.

The present invention has been made in view of such circumstances, and can improve the efficiency of separating and removing heavy metal ions from a waste liquid, reduce the amount of magnetic particles added to suspended particles, and thereby reduce sludge. By reducing the generation amount, the running cost can be reduced, and both the suspended particles and heavy metal ions can be treated collectively and efficiently.In addition, the organic and metal components can be easily separated and recovered. It is another object of the present invention to provide a superconducting magnetic separation system capable of effectively recycling resources by recovering them.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, ozone is injected into a waste liquid supply system for continuously supplying a waste liquid to remove metal ions contained in the waste liquid. An ozone injecting device for forcibly oxidizing and converting the insoluble oxide particles into insoluble oxide particles, an aggregating device for aggregating the suspended matter such as organic substances or the oxide particles contained in the waste liquid to form the agglomerated particles, One or two or more magnetic filters that form a strong magnetic field space by a solenoid magnet and capture particles contained in the waste liquid are disposed, and both heavy metal components and suspended components such as organic substances are collectively collected from the waste liquid. Or a superconducting magnetic separation system characterized by being individually captured by said magnetic filter.

According to a second aspect of the present invention, in the superconducting magnetic separation system according to the first aspect, an ozone injection device, a coagulation treatment device, and a magnetic filter are sequentially disposed in the waste liquid supply system. The heavy metal ions contained in the wastewater are forcibly oxidized and precipitated as insoluble oxide particles. A superconducting magnetic separation system characterized by agglomerated as a magnetic floc in a form taken up by matter particles, and the magnetic filter collectively capturing both suspended heavy components such as heavy metal components and organic substances as the magnetic flocs. provide.

According to a third aspect of the present invention, in the superconducting magnetic separation system according to the first aspect, a first magnetic filter, an ozone injecting device, a coagulation treatment device, and a second magnetic filter are sequentially disposed in the waste liquid supply system. The first magnetic filter captures only suspended particles such as organic substances contained in the waste liquid, and the ozone injection device forcibly oxidizes heavy metal ions contained in the waste liquid from which the suspended particles have been removed. Treated and precipitated as insoluble oxide particles, wherein the aggregating device aggregates only the heavy metal oxide particles precipitated by the ozone injector, and the magnetic filter captures the aggregated heavy metal component. To provide a superconducting magnetic separation system.

According to a fourth aspect of the present invention, in the superconducting magnetic separation system according to any one of the first to third aspects,
Provided is a superconducting magnetic separation system, wherein a coagulation treatment device is arranged in a strong magnetic field space formed by a superconducting solenoid magnet of a magnetic filter.

According to a fifth aspect of the present invention, in the superconducting magnetic separation system according to the fourth aspect, the coagulation treatment apparatus forms a strong coagulated floc by using a coagulant containing iron as a main component. And a superconducting magnetic separation system.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a superconducting magnetic separation system according to the present invention will be described below with reference to the drawings.

First Embodiment (FIG. 1) The superconducting magnetic separation system of the present embodiment collects both suspended components such as heavy metal components and organic substances from waste liquid by a magnetic filter. FIG. 1 illustrates this first
FIG. 1 is a system configuration diagram illustrating a configuration of an embodiment.

As shown in FIG. 1, in the present embodiment, an ozone injection device 12, a coagulation treatment device 13, and a magnetic filter 14 are sequentially disposed in a waste liquid supply pipe 11 for continuously supplying a waste liquid a. .

The ozone injection device 12 forcibly oxidizes heavy metal ions contained in the waste liquid a by supplying ozone to precipitate insoluble oxide particles.
Ozone reactor 1 capable of storing a certain amount of waste liquid a
5, an air diffuser 16 provided at the bottom of the ozone reaction tank 15, and an ozone generator 17 for supplying ozone to the air diffuser 16.

The coagulation treatment device 13 coagulates suspended particles such as organic substances contained in the waste liquid a as magnetic flocs in the form of being taken in by the heavy metal oxide particles precipitated by the ozone injection device 12. A coagulation tank 18 capable of storing the waste liquid a, and an additive supply unit (not shown).

The magnetic filter 14 forms a strong magnetic field space and collectively collects both heavy metal components and organic components and other suspended components that are aggregated as magnetic flocs. The magnetic filter 14 includes a superconducting solenoid magnet 19 and a filter unit 20. The superconducting solenoid magnet 19 and the filter unit 20
It has a configuration substantially similar to that shown in FIG. That is, the superconducting solenoid magnet 19 is configured to generate a magnetic field of, for example, 3 to 10 stellas. In addition, the filter unit 20 has a configuration in which a filter unit in which a mesh of ferromagnetic wires having a diameter of several tens to several hundreds of microns is stacked is accommodated in a processing cylinder. Although not shown, a captured matter discharge pipe is connected to the lower end side of the processing cylinder so as to be separated from the waste liquid supply pipe 11, and a water supply pipe for washing or the like is connected to the outlet pipe.

In the configuration of this embodiment, when the waste liquid is treated, the waste liquid a is first introduced into the ozone reaction tank 15 from the waste liquid supply pipe 11. The waste liquid a contains heavy metal ions such as zinc and manganese and suspended particles b (circled in the figure) such as organic substances and minerals, and is generated by the ozone generator 17 in the ozone reactor 15. Ozone is supplied into the tank through the air diffuser 16, whereby the heavy metal ions are forcibly oxidized and become insoluble, and are precipitated as small-diameter oxide particles (triangles in the figure) d. Here, the suspended particles b pass as they are.

The waste liquid a that has left the ozone reaction tank 15 then flows into the coagulation tank 18. In the coagulation tank 18, the oxide particles d and the suspended particles b coagulate together with ferric chloride or a polymer coagulant,
It becomes a magnetic floc (square mark in the figure) e. This magnetic floe e is formed of oxide particles d to a particle size suitable for subsequent magnetic separation.
Are agglomerated and the suspended particles b are taken in the oxide particles d.

The waste liquid leaving the coagulation tank 18 finally enters the magnetic filter 20 of the magnetic filter 14. Magnetic filter 20
Is exposed to the strong gradient magnetic field of the superconducting solenoid magnet 19, and the magnetic floe e is separated by the magnetic force against the oxide particles d and the hydroxide of iron derived from ferric chloride or the like.
Then, the purified treated water c is discharged from the outlet pipe 21 above the magnetic filter 14.

As described above, according to this embodiment, the heavy metal ions in the waste liquid a, which are conventionally difficult to treat, can be easily insolubilized by the physical treatment of ozone oxidation, and the strong magnetic force generated by the superconducting magnetic separation. Can be separated and removed. The heavy metal oxide particles d
By flocculating the suspended particles b with the suspended particles b, both can be subjected to magnetic separation at once. At this time,
If a large magnetic floc is formed to sufficiently increase the magnetic force on the oxide particles d, it is not necessary to add iron powder or the like for the purpose of magnetic seeding, so that the amount of generated sludge is reduced and the running cost is reduced. Reduction can also be achieved.

Second Embodiment (FIG. 2) The superconducting magnetic separation system of the present embodiment uses two magnetic filters to individually capture heavy metal components and suspended components such as organic substances from waste liquid. is there. FIG. 2 is a system configuration diagram showing the configuration of the second embodiment.

As shown in FIG. 2, in the present embodiment, a magnetic filter 14a for treating suspended matter, which is a first magnetic filter, an ozone injection device 12, a coagulation treatment device 13, And a heavy metal processing magnetic filter 14b as a second magnetic filter. The respective configurations of the magnetic filters 14a and 14b, the ozone injecting device 12 and the coagulation treatment device 13 are the same as those of the first embodiment, and therefore, the corresponding portions in FIG. And the description is omitted. In the present embodiment,
A suspended sludge discharge pipe 22 and a heavy metal discharge pipe 23 are provided upstream of the magnetic filter 14a for treating suspended matter and the magnetic filter 14b for treating heavy metal via valves 24 and 25, respectively. Although not shown, an aggregating apparatus for aggregating the suspended matter may be provided in advance upstream of the suspended matter processing magnetic filter 14 if necessary.

The suspension-processing magnetic filter 14 captures only suspended particles such as organic substances contained in the waste liquid a in advance. In the ozone injecting device 12, heavy metal ions contained in the waste liquid (primary treatment liquid) a1 from which suspended particles have been removed are forcibly oxidized and precipitated as insoluble oxide particles d. Then, in the agglomeration processing device 13, an agglomerated floc (black triangle mark in the figure) f in which only the heavy metal oxide particles d precipitated in the ozone injection device 12 are condensed is generated. Further, in the heavy metal processing magnetic filter 14b, only the condensed heavy metal components are captured.

That is, in the present embodiment, the suspended particles in the waste liquid a are separated and removed by the magnetic filter 14a for treating the suspended matter, and the primary treatment liquid a1 containing only heavy metal ions is supplied to the ozone reaction tank 15 to be oxidized. Matter particles d and the coagulation tank 1
After increasing the particle size at step 8 to form aggregated particles f, they are separated and removed by the heavy metal processing magnetic filter 14b. The sludge composed of suspended particles separated by the suspension treatment magnetic filter 14a is discharged from the suspended sludge discharge pipe 22, and the heavy metal sludge is discharged from the heavy metal sludge discharge pipe 23.

According to the present embodiment, the sludge of the suspended matter and the sludge of the heavy metal can be separated and collected. Therefore, when the suspended matter is the organic sludge, the sludge containing no heavy metal can be obtained. Can be used.

Third Embodiment (FIG. 3) In the superconducting magnetic separation system of this embodiment, a coagulation treatment device is provided in a waste liquid supply pipe upstream of a magnetic filter. FIG. 3 is a configuration diagram showing the configuration of the third embodiment.

As shown in FIG. 3, in the present embodiment, the coagulation tank 18 of the coagulation treatment device 13 is disposed in the space of the strong magnetic field A formed by the superconducting solenoid magnet 19 of the magnetic filter 14. This configuration can be applied to, for example, the upstream position of the magnetic filter 14 of the first embodiment or the second embodiment.

In the aggregating apparatus 13, a strong agglomerated floc is formed by using an aggregating agent containing iron as a main component, for example, ferric chloride or ferric sulfate. Note that other components are the same as those in the above embodiments, and thus illustration and description are omitted.

According to this embodiment, the coagulation treatment device 13 is disposed in the strong magnetic field A generated by the superconducting solenoid magnet 19, so that the iron hydroxide generated from the iron-based coagulant enhances the cohesion. And strengthen the flock.
Therefore, a strong floc can be generated, so that the magnetic separation can be efficiently performed, and the amount of the flocculant may be small.
Running costs can also be reduced.

Other Embodiments The present invention is not limited to the configuration of each of the above embodiments, and various modifications and applications are possible. For example, the first embodiment,
Each configuration of the second embodiment and the third embodiment can be arbitrarily combined. In short, an ozone injecting device 12 that forcibly oxidizes metal ions contained in the waste liquid by injecting ozone into insoluble oxide particles by injecting ozone into a waste liquid supply system that continuously supplies the waste liquid, Agglomeration treatment device 13 for aggregating suspended or oxide particles of organic substances or the like to be aggregated to form aggregated particles, and one or two or more to form a strong magnetic field space by superconducting solenoid magnet 19 to capture particles contained in waste liquid The magnetic filter 14 is disposed, and various components can be employed as long as the heavy metal component and the suspended components such as organic matter are captured by the magnetic filter 14 collectively or individually from the waste liquid. It is.

[0036]

As described above, according to the superconducting magnetic separation system of the present invention, the efficiency of separating and removing heavy metal ions from waste liquid can be improved, and the amount of magnetic particles added to suspended particles can be improved. The running cost can be reduced by reducing the amount of sludge and the resulting amount of sludge,
In addition, both suspended particles and heavy metal ions can be treated at once and efficiently, and organic components and metal components can be easily separated and recovered. A great effect is achieved, for example.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a system configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a system configuration diagram showing a second embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a configuration of a superconducting magnetic separation device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Waste liquid supply pipe 12 Ozone injection device 13 Agglomeration treatment device 14 Magnetic filter 14a Magnetic filter for treating suspended matter which is the first magnetic filter 14b Magnetic filter for treating heavy metal which is the second magnetic filter 15 Ozone reaction tank 16 Aeration tube 17 Ozone generator 18 Coagulation tank 19 Superconducting solenoid magnet 20 Filter part 21 Outlet pipe 22 Suspended sludge discharge pipe 23 Heavy metal discharge pipe 24, 25 Valve a Waste liquid b Suspended particles (circled in the figure) c Treatment liquid d Oxidation Particles (triangles in the figure) e Magnetic flocks (squares in the figure) f Aggregated flocs in which only heavy metal oxide particles d are condensed (black triangles in the figure)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 9/00 502 C02F 9/00 502R 502P 502L 502D 503 503C 503G 504 504B 504E F-term (Reference) 4D015 BA03 CA02 CA17 DA37 EA24 EA40 FA24 4D038 AA08 AB63 AB66 AB69 BB16 BB18 4D050 AA13 AA15 AB52 BB02 CA11 CA16 4D062 BA03 CA02 CA17 DA12 DA37 EA24 EA40 FA24

Claims (5)

[Claims] 1. A waste liquid supply system for continuously supplying waste liquid,
An ozone injecting device that forcibly oxidizes metal ions contained in the waste liquid by injecting ozone into insoluble oxide particles, and a suspension of organic substances or the oxide particles contained in the waste liquid or the oxide particles. 1 or 2 for forming an intense magnetic field space by an agglomeration processing apparatus for agglomerating into agglomerated particles and a superconducting solenoid magnet to capture particles contained in the waste liquid
A superconducting magnetic separation system, comprising: a magnetic filter as described above; and a heavy metal component and a suspended component such as an organic substance are collectively or separately captured from the waste liquid by the magnetic filter. 2. The superconducting magnetic separation system according to claim 1, wherein an ozone injecting device, a coagulation treatment device, and a magnetic filter are sequentially disposed in the waste liquid supply system, and the ozone injecting device includes heavy metal ions contained in the waste liquid. Is forcibly oxidized to precipitate as insoluble oxide particles, and the coagulation treatment device takes in suspended particles such as organic substances contained in the waste liquid by heavy metal oxide particles precipitated by the ozone injection device. A superconducting magnetic separation system characterized by coagulating as a magnetic floc in a shape, and the magnetic filter collectively capturing both the heavy metal component and the suspended component such as an organic substance as the magnetic floc. 3. The superconducting magnetic separation system according to claim 1, wherein a first magnetic filter,
An ozone injection device, a coagulation treatment device, and a second magnetic filter are provided. The first magnetic filter captures only suspended particles such as organic substances contained in a waste liquid, and the ozone injection device includes the suspended particles. The heavy metal ions contained in the removed waste liquid are forcibly oxidized and precipitated as insoluble oxide particles, and the aggregating device aggregates only the heavy metal oxide particles precipitated by the ozone injection device, A superconducting magnetic separation system, wherein the magnetic filter captures the aggregated heavy metal component. 4. The superconducting magnetic separation system according to claim 1, wherein the coagulation treatment device is disposed in a strong magnetic field space formed by a superconducting solenoid magnet of a magnetic filter. Superconducting magnetic separation system. 5. The superconducting magnetic separation system according to claim 4, wherein the coagulation treatment device forms a strong coagulated floc by using a coagulant containing iron as a main component. system.