JP2003112189A - Contact apparatus and liquid treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact apparatus which, when the degree of fouling of raw water (foul water) is low, exhibits a sufficient cleaning effect while reducing he initial cost and running cost even if its scale is smaller than a conventional liquid treatment apparatus and which, e.g. when the degree of fouling is very high and the direct treatment of foul water with a liquid treatment system imposes a large burden on it and is inefficient, is used for preliminary water cleaning to reduce the burden of succeeding treatments, enabling the treatment of raw water; and a liquid treatment system having the contact apparatus incorporated therein. SOLUTION: The contact apparatus comprises a magnetic field mixing means 61 for subjecting a liquid containing suspended matters such as colloid particles to a mixing treatment in a magnetic field, a microair supply means 62 for mixing microair into the liquid after the treatment with the magnetic field mixing means 61, an oxidizing agent supply means 63 for supplying an oxidizing agent having a sludge volume reduction effect on the liquid, and a contact tank 65 for temporarily storing the liquid mixed with the high-pressure microair and conducting a separation/coagulation treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact device for purifying a liquid containing suspended matter such as colloidal particles, and particularly to efficiently agglomerate and separate suspended matter contained in the liquid to be removed. The present invention relates to a contact treatment device having a pretreatment device for cleaning the raw water only by the contact treatment device, and a liquid treatment system in which the contact treatment device is arranged as a part of another liquid treatment device.

[0002]

2. Description of the Related Art Conventionally, there have been proposed methods and systems for purifying livestock wastewater containing manure from cattle, pigs, etc., or industrial wastewater containing chemical substances such as cleaning liquids and factory waste liquids.

[0003] Such conventional liquid treatment system will be described by taking pig effluent drainage treatment as an example. In the conventional water treatment system for pig effluent, filtration for removing solid suspended matters by passing raw water through a screen or the like. Treatment means, activated sludge treatment means for decomposing water-soluble organic substances and the like by aerobic microorganisms, and precipitation decomposition treatment for precipitating water-soluble organic substances separated from raw water by this decomposition to separate water and precipitates And means for dehydrating and removing water from the precipitate.

More specifically, each of these processing means will be described. In the filtration processing means, when raw water containing solid suspended matter such as manure and urine passes through the screen, the suspended matter is captured and removed by the screen. . The raw water from which the suspended solids have been removed is temporarily stored in a storage tank, then transferred to a measuring tank, and flows into an activated sludge treatment tank as activated sludge treatment means for each amount of water that can be treated with activated sludge. In this activated sludge treatment tank, aerobic microorganisms biodegrade water-soluble organic substances such as nitrogen in raw water. The raw water biodegraded by this treatment means is sent to a sedimentation tank as a sedimentation decomposition treatment means, and in this sedimentation tank, water-soluble organic substances and the like are precipitated at the bottom of the sedimentation tank to separate from water, and this water is disinfected. After being discharged into a river or the like, the precipitate is transferred to the dehydration treatment means. In this dehydration processing means, it is dehydrated by a dehydrator to be solidified and discharged.

Here, in the conventional water treatment system, the washing water of the dehydrator is introduced into the storage tank in order to avoid an increase in the site and construction cost due to the large size of the activated sludge treatment tank. It was like this.

Therefore, with the washing water of the dehydrator,
Since so-called high-concentration raw water having a high organic matter load is diluted, the burden of aerobic microorganisms for decomposing organic matter in the activated sludge treatment means has been reduced.

[0007]

However, in the conventional water treatment system, the washing water for the dehydrator cannot sufficiently dilute the high-concentration raw water, so that a larger amount of water is required. In addition, as the amount of water for diluting raw water increases, the amount of water to be purified also increases, so that the water treatment facility eventually becomes large in scale, and initial costs such as construction costs and power consumption for water treatment and water supply are required. There has been a problem that running costs such as fees increase.

In view of these problems, in the present invention, as long as the raw water (dirt water) is lightly soiled, the initial cost and running cost can be reduced with a device smaller than the conventional liquid treatment device. If the cleaning effect can be exerted, the degree of contamination is extremely severe, and if the wastewater is treated directly by the liquid treatment system, which is burdensome and inefficient, etc. It is an object of the present invention to provide a contact device that can perform preliminary water purification as a primary treatment and reduce the burden of subsequent treatment to treat raw water, and a liquid treatment system incorporating the contact device.

[0009]

In order to achieve the above-mentioned object, the contact device of the present invention according to claim 1 is characterized by a magnetic field mixing means for mixing a liquid containing suspended matter such as colloidal particles in a magnetic field. A micro air supply means for mixing high pressure micro air with the liquid that has passed through the magnetic field mixing means, an oxidant supply means for supplying an oxidant having a sludge volume reducing effect to the liquid, and the high pressure micro air. It has a contact tank for temporarily storing the liquid and performing separation / aggregation treatment.

According to the contact device of the present invention, in the magnetic field mixing means, by pretreating the molecules / particles in the raw water, a micro-air supply is performed in a contact tank having a simpler structure than the conventional one. In the means, it is possible to assist the floating of suspended matter such as colloidal particles using micro air mixed with raw water.

The contact device of the present invention according to claim 2 is characterized in that, in the contact device according to claim 1, a flocculating agent capable of supplying a flocculating agent having a flocculating promoting effect to the liquid stored in the contact tank. It is the point that it further has an agent supply means.

According to the contact device of the present invention, the aggregation promoting effect of the aggregating agent can assist the aggregation of foreign matters such as suspended matter contained in the liquid and promote the purification of the treated water.

The liquid treatment system of the present invention according to claim 3 is characterized in that the contact device according to claim 1 or 2 is arranged in a part of the liquid treatment device, and raw water having a high impurity concentration is provided. Is used as a primary treatment (pretreatment) means when purifying the.

According to the liquid treatment system of the present invention, particularly when the degree of contamination of the raw water is severe, the treatment load on other components of the liquid treatment system is reduced, and suspended matter in the liquid is removed. It is possible to surely remove, improve the quality of the obtained treated water, and expand the uses of the treated water.

[0015]

1 is an overall explanatory view showing the configuration of an embodiment of a contact device according to the present invention.

The contact device of this embodiment comprises a magnetic field mixing means 61 for mixing a liquid (raw water) containing colloidal particles in a magnetic field, and the magnetic field mixing means 6.
Micro air supply means 62 for mixing high-pressure micro air with the liquid passed through 1, oxidant supply means 63 for supplying an oxidant having a sludge volume reducing effect to the liquid stored in the contact tank, and further aggregation A main constituent is a coagulant supply means 64 capable of supplying a coagulant having an accelerating effect, and a contact tank 65 for temporarily storing the liquid mixed with the high-pressure micro air in the contact device, which is provided in a raw water tank (not shown). The stored raw water is transferred from the raw water tank to the contact tank 65 by using a water intake pump 66 and a raw water transfer pipe 67.
In the process of circulating the raw water, various treatments are performed on the raw water by using each of the above means.

Here, the magnetic field mixing means 61 is
As shown in FIG. 2, the mixer tube 71 has a mixer tube 71 and a pair of electromagnets 100. The mixer tube 71 has a cylindrical tubular pipe 72 made of ceramics or resin as a main body. On the inner side surface of the tubular pipe 72, rows of two neodymium magnets 73 in which N-pole neodymium magnets 73a and S-pole neodymium magnets 73b are alternately arranged are arranged so as to face opposite polarities. And is flush with the inner surface of the cylindrical pipe 72. In the present embodiment, as shown in FIG. 1, the rows of the neodymium magnets 73 are embedded in the upper and lower positions inside the tubular pipe 72, and the neodymium magnets 73 are approximately 10,000.
It has a Gaussian magnetic force.

In the tubular pipe 72, about 11
A neodymium magnet 75 having a magnetic force of 000 Gauss and a neodymium fin 75 made of a ceramic material embedded in the surface thereof is disposed rotatably in the circumferential direction. The neodymium fin 75 acts as a fin for stirring on the mixing target object flowing in the cylindrical pipe 72, and more specifically, in the present embodiment, a flat plate twisted in a substantially spiral shape is used. Two types of fins, a first fin 75a formed to rotate the object flowing in the mixer pipe clockwise and a second fin 75b formed to rotate the object counterclockwise, The tubular pipes 72 are formed by alternately arranging them in the axial direction. As shown in FIG. 2, the first fin 75a and the second fin 75b are provided with N-pole neodymium magnets 74a and S-pole neodymium magnets 74b alternately on the surface thereof along the flowing direction of the object to be mixed. It is buried in.

The mixer tube 71 having the above-mentioned structure has a neodymium magnet 73 embedded in the inner surface of a tubular pipe 72.
Then, the magnetic force of the neodymium fin 75 has an electromotive force. Further, the first fin 75a and the second fin 7 which rotate the neodymium fins 75 in opposite directions of rotation.
By alternately arranging 5b and 5b, the treatment liquid can be stirred more efficiently.

On the outside of the mixer pipe 71,
In order to apply a magnetic field to the neodymium magnets 74a and 74b of the pair of neodymium fins 75 arranged in the mixer tube 71, the pair of electromagnets 100 are arranged so as to face each other with the mixer tube 71 interposed therebetween. It is set up.

Therefore, since the magnetic field of the electromagnet 100 can exert a magnetic force which is a repulsive force or an attractive force on the neodymium magnets 74a and 74b, the magnetic force can rotate the neodymium fin 75 in the circumferential direction. It is like this.

As described above, when the neodymium fins 75 rotate in the circumferential direction, the number of magnetic flux linkages penetrating the neodymium fins 75 among the magnetic fluxes between the pair of electromagnets 100 suddenly changes. An induced electromotive force is generated in the neodymium fin 75 due to the change in the number of alternating electrodes.

Under the influence of this electromotive force, liquid molecules subdivided by the rotation of the neodymium fin 75 are charged as negative ions, and suspended matter molecules such as colloid particles are charged as positive ions or negative ions. It has become so.

The polarity of the charges of the floating substance molecules depends on the direction of the electromotive force generated by the neodymium fin 75.

Here, as the liquid, particularly, the floating substance molecules contained in the artificially produced industrial wastewater and the like are mixed with those containing many positive ions and those containing many negative ions. , If the polarity of this ion is not uniform,
Although it is difficult to efficiently perform the subsequent coagulation and separation, in the present embodiment, the floating molecule can be uniformly charged to either positive or negative charge by using the neodymium fin 75. It is like this.

Therefore, in this embodiment, it is possible to improve the efficiency of the coagulation and separation following the subdivision charging process by the mixer tube 71 and the electromagnet 100.

Further, in the present embodiment, the electromagnet 100 is adapted to reverse the magnetic field applied to the neodymium fin 75 in accordance with the properties of the liquid such as the polarities of suspended matter molecules.

When reversing the magnetic field, the neodymium fin 75 switches its rotation in the direction opposite to the original direction of rotation, and the switching of this rotation causes the direction of the electromotive force generated by the neodymium fin 75 to switch to the opposite direction. It is like this.

When the electromotive force is switched, the polarities of the charges of the floating substance molecules can be reversed.

Therefore, since many positive ions are contained in the suspended matter, the one in which the electromotive force was applied in the direction of uniformly charging the suspended matter molecules to the positive ions, when the negative ions are increased, By switching the electromotive force generated in the neodymium fin 75 by reversing the magnetic field, the floating substances can be uniformly charged with negative ions.

Therefore, it is possible to flexibly perform an appropriate subdivision charging process according to the property of the liquid.

Further, in the present embodiment, the electromagnet 1
00 is capable of varying the strength of the magnetic field applied to the neodymium fin 75 in accordance with the ion concentration of floating substance molecules contained in the liquid.

As a result, even when the ion concentration of suspended matter molecules is low, an effective electromotive force can be obtained by increasing the strength of the magnetic field, and the subdivision charging process can be properly performed. ing.

The micro air supply means 62 has a pressurizing pump 76 and a buffer tank 77, and the pressurizing pump 76 transfers treated water which constitutes a transfer passage for the treated water stored in the contact tank 65. The pipe 78 is connected. Then, a part of the treated water in the contact tank 65 supplied through the treated water transfer pipe 78 is used to generate high pressure micro air. That is, high-pressure micro-air is generated by injecting air having a diameter of several tens of μm into the treated water from the pressure pump 76 through an air supply pipe (not shown), and the high-pressure micro-air is stored in the buffer tank 77. It is designed to be mixed with the raw water sent from the raw water transfer pipe 67.

Further, the contact tank 65 has a tank 79 for temporarily storing the liquid mixed with the high-pressure micro air and performing a separation / aggregation process. An end of the raw water transfer pipe 67 is connected near the bottom of the tank,
The raw water mixed with the high pressure micro air in the buffer tank 77 is released into the tank 79, and the air bubbles generated when released into the tank 79 adsorb the suspended matter in the raw water. While the tank 79
The present embodiment utilizes the action of rapidly rising inside to purify water.

Further, in this embodiment, the raw water mixed with the high-pressure micro air is added with an appropriate amount of the oxidizing agent by the oxidizing agent supplying means 63 before reaching the contact tank 65, and the flocculant supplying means is added. According to 64, an appropriate amount of flocculant is added.

By adding the oxidizing agent to the raw water, the volume of the filth extracted from the raw water can be reduced, and by adding the coagulant to the raw water, the coagulation of the filth extracted from the raw water can be promoted. You can

A tank 79 is provided above the contact tank 65.
Immediately below the internal water surface position, the flocs F floating in the raw water released in the contact tank 65, such as colloidal particles, are placed in the contact tank 6.
5, a scum removing means 68 for opening a scum removing port 81 which flows out into the scum tank 80 adjacent to No. 5 is formed. Then, in the scum tank 80, the scum S is filtered out, and the treated water after the scum S is removed is returned to the raw water tank or the contact tank 65 again. Further, the flock F such as filth deposited on the bottom of the contact tank 65 is regularly removed by using a known air lifter.

The tank 79 of the contact tank 65 is connected with a treated water transfer pipe for discharging the treated water from which the flocs F that float or settle are removed to the outside. Through this treated water transfer pipe. , Part of the treated water is transferred to the micro air supply means 62 to be treated water containing micro air, and the other part is transferred to the raw water tank to be used for diluting the raw water, or After being discharged, it is used for reuse as industrial water or agricultural water, for example.

Next, the operation and action of the above-mentioned contact device will be described.

First, from the raw water tank, the intake pump 6
The raw water taken in using No. 6 is sent to the mixer pipe 71 of the magnetic field mixing means 61.

In the mixer pipe 71, as described above, the raw water is agitated by the neodymium fins 75, so that suspended matters in the raw water are finely crushed to make the size uniform.

The magnetic field mixing means 6 of this embodiment is also used.
In No. 1, a cavitation phenomenon occurs in raw water. When this cavitation phenomenon occurs, hot spots are formed in the treated water, and places of ultra-high pressure and vacuum are formed. In this state, the redox effect acts on the colloidal particles in the raw water, and the organic substances in the raw water are decomposed,
The size is made even. In addition, high molecular weight substances such as proteins are decomposed to lower the molecular weight.

Also, it is rotated at high speed in the mixer pipe 71,
Induced electromotive force is generated in the raw water having an increased flow velocity due to the interaction between the electromagnet 100 of the magnetic field mixing means 61 and the neodymium magnet 73 disposed in the mixer tube 71. The colloidal particles can be ion aligned. Furthermore, the magnetic field mixing means 61 also acts on the zeta potential, which is related to aggregation, and can set the zeta potential to approximately zero.

The raw water in which the molecules and particles are ion-aligned is mixed with the high pressure micro air by the micro air supply means 62 while being transferred to the contact tank 65 in the raw water transfer pipe 67, and the oxidizing agent and the flocculating agent are mixed. Is added.

In the contact tank 65, the colloidal particles ion-aligned by the treatment in the magnetic field mixing means 61 react with a very small amount of the oxidizing agent and the aggregating agent, and become flocs F while reducing the volume. The suspended matter such as colloidal particles that have become the flocs F are adsorbed by the micro air bubbles of the raw water released in the tank 79, and are rapidly floated on the surface of the raw water in the tank 79. Then, a small amount of raw water is discharged from the scum removing port 81 to the outside of the contact tank 65, and dehydration processing is performed in the scum tank 80.

Due to its particle size and other factors, the tank 7
The dirt that has settled and aggregated without floating inside 9 is also removed, for example, by using the air lifter as described above or by providing the discharge port formed at the bottom of the tank 79. It may be configured to supply and dehydrate.

In the contact device thus constructed, the treated liquid (treated water) can be obtained below the water surface of the contact tank 65. This treated water can be used as industrial water or agricultural water in this state, or returned to the raw water tank through the treated water transfer pipe 78 and used for diluting the raw water or for mixing with high pressure micro air. It can also be used.

As described above, in the contact device of the present embodiment, the magnetic field mixing means 61 pretreats the molecules / particles in the raw water, so that the contact tank 65 has a simple structure.
In F., it became possible to easily collect floating substances such as colloidal particles by using a micropore to form flocs F. By removing the flocs F, treated water can be obtained. Further, by the processing in the magnetic field mixing means 61, in addition to removal of suspended matter,
It is also possible to decompose dissolved pollutants and separate them from water molecules, thus improving the quality of purification treatment. Especially if the raw water (dirty water) is lightly soiled,
It is a device smaller than the conventional liquid processing device, and can suppress the initial cost and running cost and exhibit a sufficient purification effect.

The contact device of the present embodiment can be arranged in a part of the liquid treatment system and used as a primary treatment (pretreatment) means when purifying raw water having a high impurity concentration, for example. .

The liquid treatment system may be a treatment system having any constitution. For example, the treatment obtained by the contact device after the step of removing suspended matters such as colloidal particles performed in the contact device is performed. Aggregation treatment means for oscillating low-frequency ultrasonic waves in water to agglomerate the colloidal particles and disperse them from liquid molecules, and agglomerates containing metal substances such as heavy metals of the colloidal particles are adsorbed and precipitated by magnetic force and discharged. A liquid treatment system provided with an aggregate discharge treatment means can be considered.

As the aggregating treatment means, an electromagnetic coil is wound around the outer periphery thereof, and a low-frequency ultrasonic wave which oscillates a low-frequency ultrasonic wave in a frequency range of 50 kHz or less according to the concentration of treated water. An example is a coagulation processing pipe provided with an oscillator.

When the low-frequency ultrasonic wave is oscillated into the treated water by the low-frequency ultrasonic wave oscillating body, among the liquid molecules and colloidal particles which are irregularly arranged, the liquid molecules charged with negative ions Are attracted to the wall surface side of the aggregating treatment pipe and flow along the wall surface, colloid particles charged with positive ions are allowed to flow on the central part side of the aggregating treatment pipe, and liquid molecules and colloid particles are dispersed. As a result, the colloidal particles are aggregated.

An example of the aggregate discharge processing means is a discharge processing tank. This aggregate discharge processing means is
The permanent magnet 28b made of neodymium or the like adsorbs and discharges the colloidal particles, which have been formed into an aggregate by the separation and aggregation treatment, downward.

The agglomerate discharge treatment means is provided with a discharge treatment tank for storing treated water, and the agglomerate treatment pipe is connected to the bottom of the discharge treatment tank to agglomerate. The treated water containing water is introduced, and a permanent magnet such as neodymium is laid. Then, of the treated water that has flowed in from the aggregating treatment pipe, the agglomerates that are in a charged state are attracted by the magnetic force of the permanent magnet and settle to the bottom.

The sediment collected at the bottom of the discharge processing tank is discharged to the outside of the tank through a discharge port connected to the bottom of the discharge processing tank.

The treated water from which aggregates and the like have been removed in the discharge treatment tank is discharged through a discharge pipe connected to the discharge treatment tank and used as industrial water or agricultural water.

Regarding the liquid processing system,
Without being limited to the above-mentioned configuration, for example, deodorizing treatment means for oscillating a high frequency electromagnetic ultrasonic wave in the treated water to remove a bad odor from the treated water, applying a high voltage pulse to the treated water, High-voltage pulse treatment means for performing decolorization and sterilization treatment of the treated water by separating and removing nitrogen from the treated water, activated water activated by further miniaturizing liquid molecules by the action of a magnetic field. Liquid molecular subdivision processing means for producing, redox processing means for redox reaction of the treated water ionized by charging processing to return to a stable state, for dehydrating the precipitate composed of the colloidal particles It may be a liquid treatment system having a dehydration treatment means, a centralized control means connected to the respective treatment means and controlling each treatment operation, and the like.

Thus, in the liquid treatment system,
By performing the primary treatment of the raw water in the liquid treatment system in the above-mentioned contact device, the raw water can be treated while reducing the treatment load of each subsequent means.

The present invention is not limited to the above-described embodiment, but various modifications can be made if necessary.

[0061]

As described above, according to the contact device of the present invention, the magnetic field mixing means is used to subdivide various substances contained in the liquid, such as liquid molecules and colloid particles, and to treat the electrostatic charge. By performing ion alignment,
Raw water treated by the magnetic field mixing means is mixed with high-pressure micro air, and the air bubbles of the micro air are used to float various subdivided substances as flocs,
By removing this floc, it was possible to purify the raw water, and it was possible to reduce the size of the liquid processing device and reduce the initial cost and running cost.

By using this contact device in the pretreatment stage of liquid treatment in the liquid treatment system, in particular,
When the degree of contamination of the raw water is severe, the processing load on other components of the liquid treatment system can be reduced, and suspended matters in the liquid can be reliably removed, and the quality of the obtained treated water can be improved. In addition, it is possible to expand the uses of the treated water.

[Brief description of drawings]

FIG. 1 is an overall explanatory diagram showing a configuration of an embodiment of a contact device according to the present invention.

FIG. 2 is a cross-sectional view showing the structure of the magnetic field mixing means of the contact device according to the present invention.

[Explanation of symbols]

61 Magnetic field mixing means 62 Micro Air Supply Means 63 Oxidant supply means 64 Industry Supply Agent 65 contact tank 66 Water intake pump 67 Raw water transfer pipe 68 Scum removal means 71 mixer tube 72 Cylindrical pipe 73 neodymium magnet 73a N pole 73b S pole 74 Neo jum element 74a N pole 74b S pole 75 Neo Jum Fin 75a First fin 75b Second fin 76 Pressurizing pump 77 buffer tank 78 Treated water transfer pipe 79 tanks 80 scum tank 81 Scum removal port 100 electromagnet S scum F Frock

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Claims (3)

[Claims] 1. A magnetic field mixing means for mixing a liquid containing suspended matter such as colloidal particles in a magnetic field, a micro air supply means for mixing high pressure micro air with the liquid passed through the magnetic field mixing means, and the liquid. A contact device comprising: an oxidant supply means capable of supplying an oxidant having a sludge volume reducing effect; and a contact tank for temporarily storing a liquid mixed with the high-pressure micro air for separation / coagulation treatment. . 2. The contact device according to claim 1, further comprising a coagulant supply unit capable of supplying a coagulant having a coagulation promoting effect to the liquid stored in the contact tank. 3. A primary treatment (pretreatment) means for purifying raw water having a high impurity concentration by disposing the contact device according to claim 1 or 2 in a part of the liquid treatment device. A liquid treatment system characterized by being used as.