JP2000202482A - Cleaning method and device for waste water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To elongate service life of an adsorbent material and to apply the material to waste water containing high concn. sludge substance. SOLUTION: The cleaning method is constituted with the purifying stage in which the adsorbent material such as activated carbon 4 having a precipitating property under water is filled in a treating tank 1 and purified water is produced by adsorbing the sludge substance in the waste water flowing into the treating tank 1 to the adsorbent material, and the regenerating stage in which the adsorbed sludge substance is decomposed by the microorganism propagated in the treating tank 1. At the regenerating stage, the adsorbent material is fluidized by providing the space 40 to which the adsorbent material is movable at the upper part of the treating tank 1 and supplying oxygen-containing gas and the purified water at the lower part. And the waste water is cleaned by providing the space to which the adsorbent material is movable at the lower part of the treating tank and supplying oxygen-containing gas and the treated water at the upper part by using the adsorbent material having a floating property under water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a purification method and a purification device for purifying wastewater containing pollutants.

[0002]

2. Description of the Related Art As a purification technology of wastewater using an adsorbent,
2. Description of the Related Art Conventionally, a process of adsorbing and removing residual pollutants and purifying the water to a high degree has been performed by passing wastewater having a low pollutant concentration, which has been treated by an existing wastewater purification technique such as a contact aeration method, through an activated carbon layer. This technique has a drawback that activated carbon is brought into a saturated adsorption state by the adsorption of pollutants, and the adsorption capacity is lost. Since activated carbon in the saturated adsorption state is difficult to regenerate when filled in the treatment tank, it was necessary to replace the activated carbon when the state reached the saturated adsorption state.
For this reason, when the above-mentioned technology using activated carbon is applied to wastewater having a high concentration of pollutants, the time until saturation adsorption is short, and the activated carbon needs to be frequently replaced. For this reason, the application of the above-mentioned conventional technology has been limited to wastewater having a low pollutant concentration, such as wastewater treated by existing wastewater purification technology.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention aims to prolong the period of use of an adsorbent and exhibit excellent purification performance even for wastewater containing high-concentration pollutants. It is an object of the present invention to provide a purification method and a purification device.

[0004]

In order to solve the above-mentioned problems, as a result of intensive research on a method for regenerating the adsorption capacity of an adsorbent in a treatment tank, the method and apparatus for purifying wastewater of the present invention have been developed. That is, as described in claim 1, an adsorbent having sedimentation in water is filled in the treatment tank,
A purification step of generating purified water by adsorbing pollutants in the wastewater flowing into the treatment tank to an adsorbent, and a regeneration step of decomposing the adsorbed pollutants by microorganisms propagated in the treatment tank; In the regeneration step, a space in which the adsorbent can move is provided above the treatment tank, and the adsorbent is made into a fluidized bed by supplying oxygen-containing gas and purified water to the adsorbent from below the treatment tank. There is a characteristic method of purifying wastewater.

[0005] Most notably, in the present invention, in the purification step of adsorbing pollutants in wastewater to an adsorbent to purify wastewater, the pollutants adsorbed to the adsorbent are decomposed by microorganisms in a treatment tank. That is, a regeneration step for regenerating the adsorption capacity of the adsorbent is added.

[0006] By repeating the purification step of adsorbing the pollutants and the regeneration step of regenerating the adsorption capacity of the adsorbent, adsorption saturation of the adsorbent can be avoided to prolong the service period of the adsorbent.

That is, first, in a purification step, an adsorbent capable of adsorbing pollutants in water is filled in a treatment tank, and a wastewater containing the pollutants flows into the treatment tank. To reduce the concentration of pollutants in wastewater.

Next, in the regeneration step, microorganisms are used to regenerate the adsorbent, and the adsorbed pollutants are removed by decomposition. The microorganisms used here can be those in which the microorganisms contained in the wastewater are naturally propagated on the adsorbent, or those in which microorganisms with high pollutant decomposition ability that have been pre-cultured are supplied to the adsorbent and propagated. it can.

In the regeneration step, the oxygen-containing gas and the purified water are supplied to the sedimentary adsorbent from below the treatment tank in the presence of a space in which the adsorbent can move, so that the adsorbent is removed. Is fluidized bed. Here, fluidization of the adsorbent means that the adsorbent in water is pushed up by the oxygen-containing gas and purified water supplied from below and rises above the treatment tank into which the wastewater is introduced. This refers to the phenomenon of moving downward from the wall and moving inward from the wall below the processing tank.

[0010] Fluidized bed of an adsorbent is caused by an adsorbent which has sedimentation in water as an adsorbent. Here "settling"
The term "adsorbent" means that the adsorbent sinks near the bottom in the water of the treatment tank, and is obtained because the specific gravity of the adsorbent is heavier than water. On the other hand, when an adsorbent having the property of floating in water is used, even if oxygen-containing gas and water are supplied from below, only the lower adsorbent becomes a fluidized bed and the upper adsorbent does not flow. Also, if there is no space in the treatment tank where the adsorbent can move, fluidized bed does not occur.

[0011] The fluidized bed of the adsorbent is as follows.
Bring the effect. Since the pore diameter of the adsorbent is generally smaller than that of the microorganisms, it is difficult for the microorganisms to invade, and it is difficult for the microorganisms to decompose and remove the pollutants adsorbed in the pores. However, the contaminants adsorbed in these fine pores promote the diffusion of water in the pores of the adsorbent due to the fluidized bed of the adsorbent.
A concentration gradient of pollutants is easily formed. The detachment and diffusion of the pollutant are facilitated in accordance with the concentration gradient.
The pollutants adsorbed in the pores are also diffused out of the pores,
The state can be decomposed by microorganisms in the processing tank. As a result, the regeneration rate of the adsorption capacity of the adsorbent is significantly improved.

[0012] The fluidized bed makes it possible to prevent the adsorbent from solidifying and prevent adsorption saturation, and to maintain high adsorption purification performance for a long period of time. On the other hand, when the oxygen-containing gas and purified water are supplied, the space where the adsorbent can move is eliminated, and the pollutant adsorption process and the adsorbent regeneration process are repeated under the condition that the fluidized bed is not used. In addition, the adsorbent becomes a solidified state due to the microorganisms that have excessively propagated in the adsorbent, causing clogging and significantly reducing the purification performance.

Further, by supplying an oxygen-containing gas to the adsorbent, it is possible to prevent anaerobicity caused by consumption of oxygen by microorganisms propagated on the adsorbent and to keep the adsorbent under aerobic conditions. Become. As a result, the activity of decomposing pollutants by microorganisms can be kept high, and the pollutants released from the adsorbent can be immediately decomposed to further promote the release of the pollutants from the adsorbent.

Next, in the purification step again, the supply of the oxygen-containing gas from below is stopped to stop the formation of the fluidized bed of the adsorbent. When the fluidized bed is stopped, the adsorbent immediately sediments and assumes a densely packed state. When the wastewater flows in, the pollutant is adsorbed on the adsorbent with high efficiency because the packed state of the adsorbent is dense, and high purification performance is obtained. On the other hand, when an adsorbent having the property of floating in water is used, a densely packed state cannot be obtained, and the adsorption efficiency is low.

As described above, according to the present invention, the adsorbing capacity of the adsorbent can be regenerated in the treatment tank, the service life of the adsorbent can be prolonged, and wastewater containing high-concentration pollutants can be obtained. It is possible to provide a method of purifying wastewater which can be applied to wastewater.

Next, in the regeneration step, the purified water discharged from the treatment tank is guided to a purified water storage tank provided outside the treatment tank in the regeneration step, and the microorganisms and the poorly water-soluble water that have excessively propagated are regenerated. It is preferable that the particulate matter is settled in the purified water storage tank and removed from the purified water, and then the purified water is returned to the treatment tank.

Thus, the microorganisms separated from the adsorbent by the fluidized bed can be removed from the treatment tank, and a decrease in purification performance due to excessive accumulation of microorganisms on the adsorbent can be prevented. In addition, since pollutants trapped by the adsorbent can be removed at the same time, excellent purification performance can be exhibited even for wastewater with a high concentration of pollutants.

When a space in which the adsorbent can move is formed in the upper part of the treatment tank, and the oxygen-containing gas and the purified water are supplied from below the treatment tank, the adsorbent becomes a fluidized bed. On the other hand, elimination of the space stops fluidization of the adsorbent.

In order to form this space, for example, in a structure in which the adsorbent is sandwiched between the upper outflow prevention member and the lower outflow member, the upper flow prevention member is moved upward.
On the other hand, in order to eliminate the space, the upper flow prevention member is moved downward in the sandwiching structure.

The space needs to be formed at least at the time of the regeneration step of the adsorbent, and must be eliminated at the time of the purification step. When the regeneration step and the purification step are not performed, the presence or absence of a space does not matter.

Here, it is preferable that the adsorbent is intermittently made into a fluidized bed by adjusting the presence or absence of a space in which the adsorbent can move. As a result, deterioration of the adsorbent due to wear can be prevented, and the service period of the adsorbent can be extended.

The adsorbent used in the present invention may be of any type as long as it has the property of adsorbing and desorbing pollutants in accordance with the concentration of pollutants in wastewater and has the property of settling in water. . The most preferred material for such an adsorbent is activated carbon, which can be advantageously used in the present invention. The oxygen-containing gas is, for example, air.

The purification method of the present invention can be applied, for example, to the purification of domestic kitchen drainage, as well as to the purification of commercial kitchen drainage and bath drainage.

Next, as set forth in claim 8, a treatment tank filled with an adsorbent having sedimentability in water, and an upper part provided at the upper and lower parts of the treatment tank for preventing the adsorbent from flowing out. An outflow preventing member and a lower outflow preventing member, an oxygen-containing gas supply means for supplying an oxygen-containing gas to a lower portion of the processing tank,
An inflow pipe through which wastewater or purified water flows into the lower part of the treatment tank;
An outlet pipe for discharging purified water from an upper portion of the treatment tank; a purified water storage tank for temporarily storing purified water discharged from the outlet pipe and returning the purified water to the treatment tank through the inlet pipe; A purifying step of flowing wastewater into the tank, adsorbing pollutants in the wastewater with an adsorbent to generate purified water, and discharging the purified water from an outflow pipe, and purifying purified water from the purified water storage tank to the treatment tank. While supplying the oxygen-containing gas to the treatment tank by the oxygen-containing gas supply means while refluxing, a space in which the adsorbent can move is secured above the treatment tank by moving the upper outflow prevention member upward, thereby adsorbing. There is an apparatus for purifying wastewater, which comprises a mechanism for repeating a regeneration step for forming a fluidized bed of material.

The above-mentioned purifying apparatus is an apparatus for realizing the above-described method for purifying wastewater. The purification device is composed of a treatment tank for purification and a purified water storage tank for temporarily storing purified water and returning it to the treatment tank. A mechanism capable of repeating a regeneration step of regenerating the adsorbent by supply.

The adsorbent contaminated by the adsorption of the pollutants in the wastewater diffuses the pollutants into the water by fluidization in the regeneration step.
It is detached and decomposed by microorganisms to be regenerated. For this reason,
According to the present purification device, the adsorbent is appropriately regenerated, and the adsorption capacity can be maintained for a long time. In addition, it can exhibit excellent purification performance even for wastewater containing high concentrations of pollutants.

[0027] As described in claim 10, the adsorbent having sedimentation in water is, for example, activated carbon. Further, the purifying apparatus can be used for purifying domestic kitchen drainage and bath drainage.

The problem of the present invention can be solved by using an adsorbent having a floating property in water. That is, as described in claim 2, an adsorbent having a floating property in water is filled in a treatment tank, and pollutants in wastewater flowing into the treatment tank are adsorbed by the adsorbent to generate purified water. A purification step and a regeneration step in which the adsorbed pollutants are decomposed by microorganisms propagated in the treatment tank. In the regeneration step, a space in which the adsorbent can move is provided below the treatment tank. There is a method for purifying wastewater, wherein an adsorbent is fluidized and floated by supplying an oxygen-containing gas and purified water to the adsorbent from above.

This purification method is characterized in that a floating adsorbent is used, a space in which the adsorbent can move is provided below the processing tank, and an oxygen-containing gas is supplied from above the processing tank. This is different from the purification method using an adsorbent having sedimentation in water.

In the regeneration step of this purification method, an oxygen-containing gas and purified water are supplied to the adsorbent having a floating property in water from above the treatment tank in the presence of a space in which the adsorbent can move. In addition, the adsorbent is fluidized and floated.

The above-mentioned flow flotation means that the adsorbent is depressed in water by the oxygen-containing gas and purified water supplied from above, so that it sinks downward from the upper part of the processing tank, and sinks from below on the wall surface of the processing tank. , And above the processing tank, from the wall to the inside. Fluid levitation and the above fluidized bed have the opposite relationship of the flow of adsorbent in water. The fluidized floating of the adsorbent provides the same excellent regenerating effect as the fluidized bed.

Next, in the purification step again, the supply of the oxygen-containing gas from above is stopped, so that the flow floating of the adsorbent is stopped. Then, the adsorbent immediately floats and assumes a densely packed state. When the wastewater is introduced into the tank, the polluted substances in the water are adsorbed to the adsorbent with high efficiency because the packing state is dense, and high purification performance is obtained. As described above, even when an adsorbent having a floating property in water is used, it has excellent regenerative power as well as an adsorbent having sedimentation in water, and can be used for a long period of time. Adsorption performance can be demonstrated. As described in claim 6, it is preferable to use a polyurethane foam as the adsorbent having a floating property in water.

Further, as an apparatus for realizing the purification method using the adsorbent having a floating property in water, there are provided a treatment tank filled with an adsorbent having a floating property in water, An upper outflow prevention member and a lower outflow prevention member provided at an upper portion and a lower portion of the processing tank for preventing the adsorbent from flowing out; an oxygen-containing gas supply means for supplying an oxygen-containing gas to the upper portion of the processing tank; An inflow pipe through which drainage or purified water flows into the upper part of the treatment tank, an outflow pipe through which purified water flows out from the lower part of the treatment tank, and a purification tank through which the purified water discharged from the outflow pipe is temporarily stored and the inflow pipe flows And a purified water storage tank for returning purified water to the treatment tank. The wastewater flows into the treatment tank, pollutants in the wastewater are adsorbed by an adsorbent to generate purified water, and the purified water is discharged from an outlet pipe. Process and the above purified water While supplying purified oxygen from the detention tank to the treatment tank and supplying oxygen-containing gas to the treatment tank by the oxygen-containing gas supply means, the adsorbent is moved to the lower part of the treatment tank by the downward movement of the lower outflow prevention member. There is an apparatus for purifying wastewater, which is provided with a mechanism for repeating a regeneration step for securing a movable space and forming a floating flow of an adsorbent.

The above-mentioned purifying apparatus is characterized in that a floating adsorbent is used, an oxygen-containing gas supply means is provided in the upper part of the processing tank, and an inflow pipe for flowing waste water or purified water is provided in the upper part of the processing tank. And a purification apparatus using an adsorbent having sedimentation in water, in that an outflow pipe for allowing purified water to flow out is provided below the treatment tank.

The adsorbent that has adsorbed the pollutants in the wastewater is regenerated by diffusing and desorbing the pollutants into the water by flowing and floating in the regeneration step, decomposing the pollutants with microorganisms, and regenerating. For this reason, according to the present purification apparatus, the same excellent purification performance as the purification apparatus using the adsorbent having sedimentation can be exhibited.

As described in the eleventh aspect, the adsorbent having a floating property in water is preferably a polyurethane foam. Other aspects of the purification method and the purification apparatus using the adsorbent having a floating property in water are the same as those of the purification method and the purification apparatus using the adsorbent having the sedimentation property.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A purifying apparatus and a purifying method according to an embodiment of the present invention will be described with reference to FIGS. The purification device of this example is
As shown in FIG. 1, a treatment tank 1 filled with activated carbon 4, an upper outflow prevention member 31 and a lower outflow prevention member 32 provided at the upper and lower portions of the treatment tank 1 for preventing the activated carbon 4 from flowing out, A diffuser pipe 7 for supplying air to the lower part of the tank 1, an inflow pipe 5 for flowing waste water or purified water into the lower part of the processing tank 1, and an outflow for discharging purified water from the upper part of the processing tank 1. It has a pipe 6 and a purified water storage tank 14 for temporarily storing purified water discharged through the outflow pipe 6 and appropriately returning the purified water to the treatment tank 1 through the inflow pipe 5. Activated carbon 4 is an adsorbent having sedimentation in water.

The purifying device includes a purifying step of flowing wastewater into the treatment tank 1, adsorbing pollutants in the wastewater with an adsorbent to generate purified water, and discharging the purified water from the outflow pipe 6. The activated carbon can be moved to the upper part of the processing tank 1 by moving the upper outflow prevention member 31 upward while supplying air from the diffuser pipe 7 to the activated carbon 4 while circulating purified water from the inlet pipe 14 to the processing tank 1 through the inflow pipe 5. And a regeneration process for intermittently forming a fluidized bed of the activated carbon 4.

An upper outflow prevention member 31 is provided inside the processing tank 1.
And a lower outflow prevention member 32, between which the activated carbon 4 is filled. The upper outflow prevention member 31 and the lower outflow prevention member 32 use a material that prevents the outflow of activated carbon and allows the drainage and purified water to permeate, specifically, a stainless steel net. The upper outflow prevention member 31 is mounted to be vertically movable by the motor 15. A diffuser 7 for supplying air is disposed below the processing tank 1. Air is supplied to the air diffuser 7 through a solenoid valve 9 by a blower 8.

An inflow pipe 5 is connected to a lower portion of the processing tank 1. The inflow pipe 5 connects the lower part of the processing tank 1 and the three-way solenoid valve 12, and a pump 13 is provided in the middle thereof.

The three-way solenoid valve 12 includes an inflow pipe 5, a purified water supply pipe 55 connected to the purified water storage tank 14, and a drainage storage tank 1.
It is connected to a drainage supply pipe 50 connected to 1. The three-way solenoid valve 12 is configured to appropriately select purified water flowing out of the purified water storage tank 14 via the purified water supply pipe 55 and drainage flowing from the drainage inlet pipe 50 and flow the same to the inflow pipe 5. I have.

The drainage supply pipe 50 is connected to the drainage storage tank 11. The drainage storage tank 11 is provided with a water flow detection sensor 10. The drainage storage tank 11 is configured so that drainage is supplied from the outside through a drainage inlet pipe 56. The water flow detection sensor 10 transmits information on the presence or absence of a water flow in the drainage storage tank 11 to the three-way solenoid valve 12 and the solenoid valve 9.

The upper part of the treatment tank 1 is connected to a purified water storage tank 14 through an outflow pipe 6. Purified water storage tank 1
Numeral 4 is connected to a purified water delivery pipe 60 for appropriately taking in the purified water that has flowed in.

Next, the operation mechanism of the present purification device will be described.
When the water flow detection sensor 10 in the drainage storage tank 11 detects a water flow, the three-way solenoid valve 12 is operated to connect the drainage supply pipe 50 and the inflow pipe 5, and the drainage is discharged to the drainage storage tank 11.
Then, it is supplied to the lower part of the processing tank 1 through the inflow pipe 5. Then, as shown in FIG. 1 and FIG. 2 (a), the wastewater is converted into purified water by absorbing and removing pollutants by the activated carbon 4 in the treatment tank. Purified water flows from the outflow pipe 6 through the purified water storage tank 14,
Discharged as purified water.

At this time, the solenoid valve 9 is closed by a signal from the water flow detection sensor 10 so that air is not supplied to the processing tank 1. Thereby, the water flow of the wastewater passing through the activated carbon 4 can be prevented from being disturbed by the passage of air, and the pollutant adsorption efficiency of the activated carbon 4 can be increased.

At this time, the upper outflow prevention member 31
Is moved downward by the motor 15 without leaving a space in which the activated carbon 4 can move. As a result, the activated carbon 4 is filled with high concentration, and when wastewater flows into it,
Since the activated carbon 4 is densely packed, pollutants are adsorbed on the activated carbon with high efficiency, and high purification performance is obtained.

Next, when the water flow detecting sensor 10 does not detect a water flow, the inflow pipe 5 is connected to the purified water storage tank 14 side by the three-way solenoid valve 12 instead of the drain water storage tank 11 side. Then, the purified water stored in the purified water storage tank 14 is supplied to the treatment tank 1 through the purified water supply pipe 55 and the inflow pipe 5. At this time, as shown in FIGS. 1 and 2 (b),
The solenoid valve 9 is controlled to be open and supplies air to the processing tank 1. This promotes the growth of microorganisms in the treatment tank 1, decomposes pollutants adsorbed on the activated carbon 4, and regenerates the adsorption capacity of the activated carbon 4.

In this state, as shown in FIG. 2B, the upper outflow preventing member 31 is moved upward by the motor 15 to form a space 40 between the upper outflow preventing member 31 and the activated carbon 4. Then, the activated carbon 4 is made into a fluidized bed by the air supplied from the air diffuser 7 and the purified water supplied from the inlet pipe 5.

By this fluidized bed, the pollutants adhering to the activated carbon 4 are desorbed and diffused, the microorganisms in the treatment tank 1 are decomposed, and the regeneration of the adsorption capacity of the activated carbon 4 is promoted. In addition, it is possible to prevent the activated carbon 4 from being clogged by the overgrown microorganisms and to prevent the purification performance from lowering.

Next, if the upper outflow prevention member 31 is moved downward to provide no space between the upper outflow prevention member 31 and the activated carbon 4, the fluidized bed of the activated carbon 4 is stopped, and the fluidized bed is activated. Thus, it is possible to prevent the activated carbon 4 from being deteriorated due to abrasion. Further, when the three-way solenoid valve 12 is operated to connect the drainage supply pipe 50 and the inflow pipe 5 and supply the wastewater to the treatment tank 1, the purification of the wastewater by the activated carbon 4 is started again.

Next, using the above-mentioned purification device, purification treatment was performed on kitchen wastewater of ordinary households. Processing tank 1 has a diameter of 1
The cylinder was 1.2 cm in height and 60 cm in height, and was filled with 5 liters of coal-based activated carbon. Eight treatment tanks 1 were used and connected one by one so that purified water discharged from one treatment tank entered the next treatment tank.

When a water flow was detected by the water flow detection sensor 10, the wastewater stored in the wastewater storage tank 11 was supplied to the treatment tank 1 at a flow rate of 2 liter / min. When no water flow was observed, the purified water stored in the purified water storage tank 14 was supplied to the treatment tank 1 at a flow rate of 2 liter / min, so that the water circulated in the closed system. During this time, air was introduced from the air diffuser 7 at a flow rate of 2 L / min. When no water flow at night was observed, the upper outflow prevention member 31 of the treatment tank 1 was moved upward, and the activated carbon was made into a fluidized bed for a total of 1 hour. In this way, the wastewater accumulated in the wastewater storage tank 11 and the purified water storage tank 1
FIG. 3 shows the results obtained by appropriately sampling purified water discharged from Sample No. 4 and measuring their BOD. In FIG. 3 and FIG. 4 described below, ○ indicates BOD in wastewater, and □ indicates BOD in purified water. From the measurement results, it was found that the purification treatment of the present invention produced purified water having a BOD lowered significantly below the effluent standard for a long period of time, during which time it was not necessary to exchange activated carbon.

On the other hand, the case where the upper flow preventing member was moved downward and the fluidized bed was not formed (comparative example)
A similar test was conducted for the test results, and the results are shown in FIG. In this case, after about 10 days had passed, the pressure loss when the wastewater passed through the activated carbon increased, and a significant decrease in purification performance was observed. This is because
It is considered that the activated carbon layer was clogged due to overgrowth of microorganisms. From the above, to prevent clogging of the activated carbon layer,
It can be seen that the fluidized bed of activated carbon works extremely effectively.

The following effects can be obtained by treating wastewater with the purification method and the purification device of the present embodiment. 1. The expiration date of activated carbon can be greatly extended. 2. It is possible to treat wastewater with a high concentration of pollutants. B
Even wastewater with a high pollutant concentration of about 600 ppm OD can be purified to a wastewater standard value or less. 3. The processing apparatus can be significantly reduced in size. Comparing only the processing tank body, the tank volume can be reduced to 1/25 of the contact aeration method.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a purification device according to a first embodiment.

FIG. 2 is a schematic view showing a purification step (a) and a regeneration step (b) of the purification method according to the first embodiment.

FIG. 3 is a characteristic diagram showing a BOD of purified water purified by the purification device of the first embodiment.

FIG. 4 shows purified water B purified by a purification device of a comparative example.
FIG. 4 is a characteristic diagram showing OD.

[Explanation of symbols]

 1. . . Processing tank, 10. . . 10. water flow detection sensor, . . 11. drainage storage tank, . . 12. three-way solenoid valve; . . Pump, 14. . . 14. Purified water storage tank, . . Motor, 31. . . Upper outflow prevention member, 32. . . Lower outflow prevention member, 4. . . Activated carbon, 40. . . Space, 5. . . 5. Inflow pipe, . . Outflow pipe, 7. . . 7. diffuser tube; . . Blower, 81. . . Air, 9. . . solenoid valve,

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hitoshi Kuno 1-1-1, Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (reference) 4D003 AA01 AB02 AB08 DA08 DA09 DA14 DA15 DA18 DA21 DA29 DA30 EA19 EA25 EA30 FA01 FA05 FA06

Claims (12)

[Claims] A purification step of filling a treatment tank with an adsorbent having sedimentation property in water and adsorbing pollutants in wastewater flowing into the treatment tank to the adsorbent to produce purified water; A regeneration step in which the contaminated substances are decomposed by microorganisms propagated in the treatment tank. In the regeneration step, a space in which the adsorbent can move is provided above the treatment tank, and the adsorbent is supplied from below the treatment tank. A method for purifying wastewater, comprising forming an adsorbent into a fluidized bed by supplying an oxygen-containing gas and purified water. 2. A purification step of filling a treatment tank with an adsorbent having buoyancy in water and adsorbing pollutants in wastewater flowing into the treatment tank to the adsorbent to produce purified water. A regeneration step in which the contaminated substances are decomposed by microorganisms propagated in the treatment tank. In the regeneration step, a space is provided below the treatment tank where the adsorbent can move, and the adsorbent is transferred from above the treatment tank to the adsorbent. A method for purifying wastewater, comprising supplying an oxygen-containing gas and purified water to fluidize and float an adsorbent. 3. The method according to claim 1, wherein in the regeneration step, purified water discharged from the treatment tank is guided to a purified water storage tank provided outside the treatment tank, and excessively propagated microorganisms and hardly water-soluble particulates are collected. A method for purifying wastewater, comprising: causing a substance to settle in a purified water storage tank and removing it from the purified water, and then returning the purified water to the treatment tank. 4. The method for purifying wastewater according to claim 1, wherein the adsorbent is intermittently made into a fluidized bed by adjusting the presence or absence of a space in which the adsorbent can move. 5. A method according to claim 1, wherein the adsorbent having sedimentation in water is activated carbon. 6. The method according to claim 2, wherein the adsorbent having a floating property in water is a polyurethane foam. 7. The method according to claim 1, wherein:
A method for purifying wastewater, wherein the wastewater is domestic kitchen wastewater and / or bath wastewater. 8. A treatment tank filled with an adsorbent having sedimentation in water, and an upper outflow prevention member and a lower outflow prevention member provided at an upper portion and a lower portion of the treatment bath for preventing outflow of the adsorbent. An oxygen-containing gas supply means for supplying an oxygen-containing gas to a lower portion of the processing tank, an inflow pipe for flowing wastewater or purified water to a lower part of the processing tank, and an outflow pipe for flowing purified water from the upper part of the processing tank. A purified water storage tank for temporarily storing purified water discharged from the outflow pipe and returning the purified water to the processing tank through the inflow pipe, and injecting wastewater into the processing tank to adsorb pollutants in the wastewater. A purification step of producing purified water by adsorbing the purified water and discharging the purified water from an outlet pipe; and supplying oxygen-containing gas by the oxygen-containing gas supply means while refluxing purified water from the purified water storage tank to the treatment tank. While supplying to the processing tank And a mechanism for repeating a regeneration step of forming a fluidized bed of the adsorbent by securing a space in which the adsorbent can move above the treatment tank by moving the upper outflow prevention member upward. Wastewater purification equipment. 9. A treatment tank filled with an adsorbent having a floating property in water, and an upper outflow prevention member and a lower outflow prevention member provided at an upper part and a lower part of the treatment tank for preventing outflow of the adsorbent. An oxygen-containing gas supply means for supplying an oxygen-containing gas to the upper part of the processing tank, an inflow pipe for flowing waste water or purified water into the upper part of the processing tank, and an outlet pipe for discharging purified water from the lower part of the processing tank. A purified water storage tank for temporarily storing purified water discharged from the outflow pipe and returning the purified water to the processing tank through the inflow pipe, and injecting wastewater into the processing tank to adsorb pollutants in the wastewater. A purification step of producing purified water by adsorbing the purified water and discharging the purified water from an outlet pipe; and supplying oxygen-containing gas by the oxygen-containing gas supply means while refluxing purified water from the purified water storage tank to the treatment tank. While supplying to the processing tank A mechanism for securing a space in which the adsorbent can move below the treatment tank by moving the lower outflow prevention member downward, and repeating a regeneration process for forming a floating flow of the adsorbent. Wastewater purification equipment. 10. The waste water purifying apparatus according to claim 8, wherein the adsorbent having sedimentation in water is activated carbon. 11. An apparatus according to claim 9, wherein said adsorbent having a floating property in water is a polyurethane foam. 12. The wastewater purifying apparatus according to claim 8, wherein the wastewater is domestic kitchen wastewater and / or bath wastewater.