JPH07171588A - Continuous fluidizing contact waste water treatment apparatus - Google Patents

Abstract

PURPOSE:To treat waste water with high efficiency by aeration using a small amt. of air by circulating bacteria supported carriers in a waste treatment chamber under stirring to react a BOD substance in waste water to be treated with oxygen in air. CONSTITUTION:The interior of a waste water treatment tank having an almost circular vertical cross section is vertically partitioned and divided at the intermediate part of the vertical cross section by a partition wall 4 and respective circulating stream generating parts 7 are formed to the upper end of the partition wall 4 and air or oxygen blown out of the aerators 8 arranged to the bottom parts of first and second waste water treatment chambers 5, 6 respectively impinges against the circulating stream generating parts 7 as air bubbles. Therefore, circulating streams are generated in the first and second waste water treatment chambers 5, 6 and the bacteria supported carriers 12 are circulated within the first and second waste water treatment chambers 5, 6 under stirring and a BOD substance in waste water to be treated is reacted with oxygen in air. By this constitution, waste water can be treated with high efficiency by aeration using a small amt. of air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small continuous fluidized contact wastewater treatment apparatus for continuously treating water to be treated by continuously flowing it into a treatment tank.

[0002]

2. Description of the Related Art Conventionally, this type of continuous fluidized contact wastewater treatment equipment introduces raw water from the wastewater to be treated into a single wastewater treatment tank and sends a gas containing oxygen such as air,
The carrier for microorganisms existing in the raw water of the wastewater treatment device is made to flow, and the carrier for supporting microorganisms in a fluid state is reacted with oxygen in the gas sent to react to decompose the BOD substance in the water to be treated. , The method of purifying and then discharging the waste water after treatment is adopted. As such a wastewater treatment device, it is preferable to install it underground in order to effectively use the land, and a septic tank that can be manufactured efficiently and economically by factory production with a synthetic resin material such as FRP. Is used.

In the wastewater treatment equipment for such a septic tank, the ability to treat the BOD substance in the wastewater is increased and the capacity of the treatment tank is reduced by continuously and uniformly circulating the carrier for holding the microorganisms. You can

[0004]

However, in the above method, in order to perform treatment with high efficiency, it is necessary to constantly and evenly flow the microorganism holding carrier in the treatment tank. That is, in order to continuously circulate the microorganism retention carrier even on holidays when the amount of water to be treated is reduced, it is necessary to constantly send air to the wastewater treatment tank to maintain the minimum aeration amount, and It is difficult to reduce power consumption by reducing the aeration amount even if the treatment amount decreases. For this reason, there is a problem that power costs occupy a large proportion of management costs.

Also, since this conventional method uses a single wastewater treatment tank for continuous wastewater treatment, it is possible to compare the case where the components contained in the water to be treated are different and the case where the inflow amount of the water to be treated is different. There is a problem that cannot be dealt with.

[0006] The present invention has been made in view of the above-mentioned problems, and it is possible to sufficiently circulate the microorganism-retaining carrier in a circulation with an air supply amount that holds a small aeration amount, reduce power costs, and treat water to be treated. Even if the water quality and amount of water are different, it can perform uniform treatment with high efficiency, easy manufacturing of wastewater treatment tank, has small and high-performance treatment capacity, and can be installed underground as well as underground. An object is to provide a fluidized contact wastewater treatment device.

[0007]

According to a first aspect of the present invention, there is provided a continuous fluidized contact wastewater treatment apparatus which comprises a wastewater treatment tank having a substantially circular vertical section, and the inside of the treatment tank is symmetrical with respect to the vertical section by partition walls. The first wastewater treatment chamber and the second wastewater treatment chamber are each divided into partitions to form inflow ports at one end side of each of the first wastewater treatment chamber and the second wastewater treatment chamber,
An outflow chamber is formed on the other end side, and a circulation flow generating part is formed above the partition wall and protrudes above the first wastewater treatment chamber and the second wastewater treatment chamber, respectively. The gas rising from the bottoms of the first wastewater treatment chamber and the second wastewater treatment chamber facing the circulation flow generating portion causes the bubbles that rise in the first wastewater treatment chamber and the second wastewater treatment chamber to rise. By colliding with the circulation flow generation part, the liquid in both treatment chambers is circulated, and the microorganism-holding carrier stored in the first wastewater treatment chamber and the second wastewater treatment chamber is agitated and circulated in both treatment chambers, respectively. An aeration device for reacting the BOD substance in the treated wastewater with oxygen in the gas is provided.

The continuous fluidized contact wastewater treatment equipment of the second aspect of the present invention is the continuous fluidized contact wastewater treatment equipment of the first aspect, wherein the inflow amount of the wastewater into the first wastewater treatment chamber and the second wastewater treatment chamber is the same. Each is adjustable.

The continuous fluidized contact wastewater treatment equipment of the third aspect of the invention is the continuous fluidized contact wastewater treatment equipment of the first or second aspect, wherein the first wastewater treatment chamber and the second wastewater treatment chamber are different from each other. Raw water from treated wastewater can be introduced.

A continuous fluidized contact wastewater treatment system according to a fourth aspect of the present invention is the continuous fluidized contact wastewater treatment system according to any one of the first to third aspects, wherein the microorganism retention carrier is plastic or a foam thereof, or It is made of porous ceramics, pellet-like activated carbon, plastic on which microorganisms are immobilized, or plastic whose surface is coated with activated carbon.

[0011]

In the continuous fluidized contact wastewater treatment equipment according to the first aspect of the present invention, the inside of the wastewater treatment tank having a substantially circular vertical section is divided into vertical partitions in the middle portion with respect to the vertical section. The circulation flow generation part is formed, and the air or oxygen blown out from the aeration devices provided at the bottoms of the first waste water treatment chamber and the second waste water treatment chamber becomes bubbles to hit the circulation flow generation part. And a circulating flow occurs in the second wastewater treatment chamber,
The microorganism holding carrier circulates in the first and second waste water treatment chambers while being stirred, and reacts the BOD substance in the waste water to be treated with oxygen in the gas for highly efficient treatment. Since the inside of the treatment tank is divided into the first wastewater treatment chamber and the second wastewater treatment chamber, when the inflow amount of the water to be treated is reduced to, for example, one half or less, one of the wastewater is discharged. The raw water to be treated flows into only the treatment chamber, and only the aeration device of the wastewater treatment chamber on one side is operated, whereby the treated wastewater can be efficiently treated and the power cost can be reduced. In addition, when treating two types of wastewater having different properties, the wastewater having different properties is made to flow into the first and second wastewater treatment chambers and treated independently to achieve highly efficient wastewater treatment. it can. In addition, since the treatment tank has a substantially circular vertical cross section, the first wastewater treatment chamber and the second wastewater treatment chamber, which are formed as partitions, have a symmetrical shape, and a treatment tank that retains strength as compared with an asymmetrical shape. The strength of the outer shell can be easily maintained, and the inner wall on the outer side is formed in an arc shape as compared with the rectangular processing tank, and a sufficient circulation flow is generated only by providing the aeration device below the partition wall. The outer shell strength is also increased.

In the continuous fluidized contact wastewater treatment apparatus of the second aspect of the present invention, the inflow amount is adjusted according to the treatment amount of the treated water or the property of the treated wastewater, so that the condition according to the raw water of the treated wastewater is satisfied. It is also possible to treat the wastewater by treating it in one of the wastewater treatment chambers when the amount of wastewater to be treated is small.

In the continuous fluidized contact wastewater treatment equipment of the third aspect of the present invention, different wastewaters to be treated can be simultaneously treated in the same treatment tank.

In the continuous fluidized contact wastewater treatment equipment of the fourth aspect of the present invention, the microorganism holding carrier does not need to be made of an expensive material, and its specific gravity is slightly larger than that of the water to be treated so that microorganisms are easily attached to the surface of the treated water. A small amount of gas is sent by the aerator at the bottom of the chamber to ensure continuous circulating flow due to rising bubbles, which improves economic efficiency.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of one embodiment of the continuous fluidized contact wastewater treatment equipment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional front view of the wastewater treatment tank, FIG. 2 is a plan view thereof, and FIG. 3 is a vertical sectional side view thereof. In FIGS. 1 to 3, reference numeral 1 is a wastewater treatment tank having a substantially circular longitudinal section. It is made of synthetic resin such as FRP. A manhole port 2 for inspection and repair is opened upward at an upper part of the wastewater treatment tank 1, and the manhole port 2 is provided with an upper lid 3 which can be opened and closed.

Further, the interior of the wastewater treatment tank 1 is divided into left and right symmetrical partitions from an intermediate portion and is a vertical flat plate-shaped partition wall 4.
The partition wall 4 is provided with a first wastewater treatment chamber 5 and a second wastewater treatment chamber 5.
The wastewater treatment chamber 6 is divided into left and right sections. The upper part of the partition wall 4 has arcuate circulation flow generating parts 7, 7 protruding above the first waste water treatment chamber 5 and the second waste water treatment chamber 6, respectively.
Is provided.

At the bottoms of the first waste water treatment chamber 5 and the second waste water treatment chamber 6 of the waste water treatment tank 1, there are located below the circulating flow generating portions 7, 7 and the air or oxygen content is reduced. Aeration devices 8 and 8 for supplying high air are respectively provided. Air supply pipes 9 and 9 connected to one end of the aeration devices 8 and 8 are provided with a blower blower 11 through an aeration control valve 10 and 10.
Connected to 11. The gas blown out from the aeration devices 8 and 8 becomes bubbles and rises vertically toward the arc-shaped circulation flow generating portions 7 and 7, and the bubbles and the microorganism-holding carrier 12 are separated by the rising water flow. By the circulation flow that collides with the arc-shaped circulation flow generation parts 7, 7 and returns to the bottoms of the waste water treatment chambers 5 and 6 along the arc-shaped inner surface walls 13 and 13 outside the waste water treatment chambers 5 and 6. The BOD substance in the wastewater to be treated and the oxygen in the bubbles rising vertically are stirred and oxidized by fluid contact to be purified.

Further, in the first wastewater treatment chamber 5 and the second wastewater treatment chamber 6, each of the wastewater treatment chambers 5 and 6 is vertically arranged at a substantially central portion thereof so that a circulating flow is favorably performed. Baffle
14, 14 can be provided as needed.

In addition, in the upper part of one end of the waste water treatment tank 1, raw water inlets 15, 15 of the waste water to be treated are directed downward to the upper parts of the first waste water treatment chamber 5 and the second waste water treatment chamber 6. 2 and 3, located at the upper center between the first waste water treatment chamber 5 and the second waste water treatment chamber 6 as shown in FIGS. 2 and 3. The treated water discharge port 16 is opened.

As shown in FIG. 3, an outflow chamber 17 communicating with the discharge port 16 is provided at the other end of the waste water treatment tank 1 with a partition plate 18.
The outlet plate 19 is formed in the lower part of the partition plate 18, and wire meshes 20, 20 having a smaller mesh than the particles are arranged in the outlet hole 19 so that the particles of the microorganism-holding carrier 12 do not flow out. There is. The material of the wire nets 20, 20 is preferably made of copper in order to prevent the adhesion of microorganisms.

The microorganism holding carrier 12 existing in advance in the first wastewater treatment chamber 5 and the second wastewater treatment chamber 6 has a specific gravity slightly larger than the raw water of the wastewater to be treated, and each wastewater treatment chamber 5 has a specific gravity. , 6 vertically rises by the rising bubbles blown from the aerators 8 and 8 located at the bottom of the separators 6, and collides with the upper end of the partition wall 4 with the circular flow generation portions 7 and 7, It is possible to return to the bottoms of the wastewater treatment chambers 5, 6 along the arc-shaped inner walls 13, 13 of the respective wastewater treatment chambers 5, 6 and to circulate them sufficiently, so there is no need to make them with expensive materials, Its specific gravity is slightly larger than the raw water of the wastewater to be treated, and plastic or its foam that easily attaches microorganisms to the front or back surface, or porous ceramics, or pelletized activated carbon, or plastic on which microorganisms are immobilized, or activated carbon on the surface. Such is preferred as the overturned plastic.

The first wastewater treatment chamber 5 by the aeration described above.
The exhaust port between the second wastewater treatment chamber 6 and the second wastewater treatment chamber 6 is, for example, the upper lid 3
To form.

Further, as shown in FIG. 4, the inflow pipes 22 connected to the raw water control tank 21 for the wastewater to be treated are respectively inflow control valves.
It is branched and connected to the inlets 15 and 15 of the first wastewater treatment chamber 5 and the second wastewater treatment chamber 6 of the wastewater treatment tank 1 via 23 and 23.

Next, the operation of this embodiment will be described.

Inside the wastewater treatment tank 1 having a substantially circular vertical section, the first wastewater treatment chamber 5 is formed by the partition wall 4 which is vertical to the center.
And the second waste water treatment chamber 6 are completely divided, and the circular flow generation portions 7, 7 having a substantially circular arc shape are formed symmetrically at the upper end of the partition wall 4, respectively. 5 and 2
The gas blown out from the aeration devices 8 provided at the bottom of the waste water treatment chamber 6 becomes bubbles and rises vertically toward the above-mentioned substantially arc-shaped circulation flow generating portions 7, 7. The microorganism holding carrier 12 existing in advance in the first wastewater treatment chamber 5 and the second wastewater treatment chamber 6 also rises due to the rising bubbles, and a substantially circular arc-shaped circulation flow generating portion is formed at the upper end of the partition wall 4. By colliding with the first and second wastewater treatment chambers 5 and 2 in the wastewater treatment tank 1,
The first wastewater treatment chamber 5 and the second wastewater treatment chamber 6 in the wastewater treatment tank 1 by the circulation flow returning to the bottoms of the wastewater treatment chambers 5 and 6 along the arc-shaped inner wall 13 of the wastewater treatment chamber 6 of FIG. The BOD substance in the water to be treated is oxidized by the continuous fluid contact between the microorganism holding carrier 12 and the oxygen in the bubbles blown out from the aeration devices 8 and is decomposed with high efficiency.

First wastewater treatment chamber 5 and second wastewater treatment chamber 6
The treated water treated in 1 flows into the outflow chamber 17 through the outflow hole 19, and at this time, the microorganism holding carrier 12 does not flow out together with the treated wastewater by the wire nets 20, 20,
The treated water treated in the wastewater treatment chamber 5 and the second wastewater treatment chamber 6 are combined and discharged.

Further, when the inflow amount of the treated water decreases due to holidays or the operating hours, the aeration control valves 10 and 10 are adjusted to an appropriate aeration amount, and the raw water to be treated is For example, when the flow rate becomes half or less than the predetermined flow rate, one of the raw water control valves 23, 23 is closed and one of the aeration control valves 10, 10 is closed to close the wastewater treatment chambers 5, 6.
By shutting down one of the wastewater treatment chambers, the power cost for aeration can be reduced.

The aeration devices 8 and 8 have circulation flow generating portions 7 and 7 at the bottoms of the first waste water treatment chamber 5 and the second waste water treatment chamber 6, respectively.
Since it is provided at a position opposed to, the amount of gas blown out from the aeration device can be reduced, and a continuous flow of the wastewater to be treated and the microorganism holding carrier 12 can be efficiently circulated.

Next, another embodiment will be described with reference to FIG.

In this embodiment, the waste water treatment tank 1 is the same as that shown in FIG.
The first wastewater treatment of the wastewater treatment tank 1 through the inflow pipes 22, 22 having the inflow control valves 23, 23 in the raw water control tanks 21, 21 respectively different from each other. Connected to the inlets 15 and 15 of the chamber 5 and the second wastewater treatment chamber 6, respectively.

In this embodiment, for example, when the properties of the water to be treated are different, such as in the food processing industry, one of the water to be treated having a high BOD concentration and the other one of the water to be treated having a low BOD concentration are first and second. Separately inflow into the two waste water treatment chambers 5 and 6, and increase the aeration amount by adjusting the aeration control valve 10 for the treatment chamber that processes the high-concentration water to be treated,
Alternatively, by adjusting the aeration control valves 10 and 10 for a treatment chamber for treating low-concentration treated water, the amount of aeration is reduced for treatment, or the amount of the microorganism-holding carrier 12 is adjusted according to the condition of the treated water. Treat with treatment conditions that match the properties of the water to be treated,
By combining the two kinds of treated wastewater with the outflow chamber 17, the wastewater is discharged from one discharge port 16 provided in the upper center of the outflow chamber 17.

Further, another embodiment will be described with reference to FIG.

In this embodiment, the drainage treatment tank 1 has an outflow chamber 1 communicating with the first wastewater treatment chamber 5 and the second wastewater treatment chamber 6.
7 and 17 are partitioned from each other, and discharge ports 16 and 16 are opened at the upper portions of the outflow chambers 17 and 17, respectively. In addition, the first wastewater treatment chamber 5 and the second wastewater treatment chamber 5 of the wastewater treatment tank 1 are connected to the raw water control tanks 21 and 21 through the inflow pipes 22 and 22 having the inflow control valves 23 and 23, respectively. Connected to the inlets 15 and 15 of the chamber 6, respectively.

The configuration of this embodiment is also suitable for treatment when the properties of the water to be treated are different, and the treated water to be treated can be discharged separately and the next treatment can be performed separately.

The structure of another embodiment will be described with reference to FIG.

FIG. 7 is a vertical sectional front view of the treatment tank of the continuous fluidized contact waste water treatment apparatus. The same structural parts as those of the embodiment of FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted. Will be described.

In this embodiment, the wastewater treatment tank 1 is formed in a substantially oval shape in the vertical cross section, and the first wastewater treatment chamber 5a and the second wastewater treatment chamber are symmetrical with respect to the vertical cross section by the partition wall 25.
Divide into 6a. The partition wall 25 is approximately V upward from the bottom.
The shape of the partition wall 25 is expanded and closed, and the upper part of the partition wall 25 is formed as the circulation flow generating portions 26, 26 projecting toward the first waste water treatment chamber 5a and the second waste water treatment chamber 6a, respectively. Ikube 26, 26
And are integrally formed.

Then, aeration devices 8 are respectively arranged at the bottoms of the first wastewater treatment chamber 5a and the second wastewater treatment chamber 6a located below the circulation flow generating portions 26, 26. .

The gas blown out from the aeration devices 8 and 8 becomes bubbles and rises up along the V-shaped partition walls 25 and 25, hits the circulation flow generation parts 26 and 26 at the upper part, and undergoes the first wastewater treatment. Chamber 5a
And a circulation flow is generated by circulating the second wastewater treatment chamber 6a along the substantially circular inner walls 27, 27 to the bottoms of the wastewater treatment chambers 5a, 6a.

In the above embodiment, the wastewater treatment tank 1 has a substantially vertical cross section or an oval shape, but it may have an appropriate shape such as a bilaterally symmetrical shape such as an elliptical outer shell shape in the vertical cross section. You can

The microorganism holding carrier 12 is made of a porous material having a specific gravity slightly higher than that of the wastewater to be treated,
It has the advantage that it can be fluidized by reducing the amount of aeration.

Further, the blower blowers of the aeration devices 8 and 8 may not be provided for each of the aeration devices 8 and 8 but may be a single blower blower 11 using an inverter.

Further, the outflow hole 19 in the lower part of the partition plate 18 may be a small hole through which the microorganism holding carrier 12 does not flow out.

[0045]

According to the first aspect of the present invention, a wastewater treatment chamber partitioned by a partition wall provided at the center is formed in a wastewater treatment tank having a substantially circular vertical section, and the circulation and recirculation occurs at the upper end of this partition wall. The microorganism holding carrier collides with the circulation flow generation portion by the rising bubbles blown from the aeration device provided at the bottom of each processing chamber corresponding to the circulation flow generation portion and continuously By generating a circulating water flow in the air, the microorganisms, the BOD substance in the water to be treated, and the oxygen in the bubbles that have risen vertically come into contact with each other to be oxidized and decomposed, so that continuous purification can be performed with high efficiency. .

Also, since the wastewater treatment tank is formed in a substantially circular or elliptical vertical section, it can withstand earth pressure when buried underground and can be installed not only on the ground but also underground. it can.

According to the second aspect of the present invention, the inflow rates of the two wastewater treatment chambers formed inside the wastewater treatment tank can be adjusted. Therefore, each wastewater treatment can be performed according to the conditions of the raw water to be treated. By adjusting the inflow volume that flows into the room, it is possible to treat according to the raw wastewater to be treated, and when the raw wastewater to be treated has decreased, such as on holidays, treat it only in one of the wastewater treatment chambers. By stopping the inflow to the other wastewater treatment room, the power cost of the aeration device can be saved.

According to the third aspect of the present invention, for example, when the raw water to be treated has different properties, such as those used in the food processing industry, the two types of treated wastewater having different BOD contents are treated separately. It can be made to flow into the wastewater treatment room and can be treated under treatment conditions that match the properties of the wastewater to be treated.

Further, according to the invention of claim 4, the microorganism-holding carrier is plastic or its foam, or porous ceramic, or pelletized activated carbon, or plastic on which microorganisms are immobilized, or the surface is coated with activated carbon. Since it is made of plastic, the microbial carrier does not have to be made of an expensive material, and even if a small amount of gas is sent by the aeration device at the bottom of the processing chamber, the microbial carrier is highly efficient and continuous due to the rise of bubbles. Circular flow can be achieved, and economic efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a continuous fluidized contact wastewater treatment equipment showing one embodiment of the present invention.

FIG. 2 is a plan view of the continuous fluidized contact wastewater treatment device of the above.

FIG. 3 is a vertical sectional side view of the continuous fluidized contact wastewater treatment device of the above.

FIG. 4 is an explanatory diagram of the continuous fluidized contact wastewater treatment device of the above.

FIG. 5 is an explanatory view of a continuous fluidized contact wastewater treatment equipment showing another embodiment of the present invention.

FIG. 6 is an explanatory view of a continuous fluidized contact wastewater treatment equipment showing another embodiment.

FIG. 7 is a vertical cross-sectional front view of a continuous fluidized contact wastewater treatment equipment showing another embodiment of the present invention.

[Explanation of symbols]

 1 Wastewater treatment tank 4,25 Partition wall 5,5a First wastewater treatment chamber 6,6a Second wastewater treatment chamber 7,26 Circulation flow generation part 8 Aeration device 12 Microorganism retention carrier 15 Inlet 16 Outlet 17 Outlet chamber

Claims (4)

[Claims] 1. A wastewater treatment tank having a substantially circular vertical cross section, and the inside of this treatment tank is divided into a first wastewater treatment chamber and a second wastewater treatment chamber by a partition wall symmetrically with respect to the vertical cross section. The first wastewater treatment chamber and the second wastewater treatment chamber each have an inflow port formed at one end side thereof and an outflow chamber formed at the other end side thereof, and the first wastewater treatment chamber is located above the partition wall. Wastewater treatment room and second
Gas that blows out from the bottoms of the first wastewater treatment chamber and the second wastewater treatment chamber facing the respective circulation flow generation portions. As a result, bubbles rising in the first wastewater treatment chamber and the second wastewater treatment chamber collide with the circulation flow generating portion to circulate the liquid in both treatment chambers, thereby causing the first wastewater treatment chamber and the second wastewater treatment chamber to circulate. Continuous flow contact wastewater, characterized in that an aeration device for reacting the BOD substance in the wastewater to be treated with oxygen in the gas is disposed by agitating and circulating the microorganism-holding carrier stored in the wastewater treatment room Processing equipment. 2. The continuous fluidized contact wastewater treatment equipment according to claim 1, wherein the inflow amounts of the wastewater into the first wastewater treatment chamber and the second wastewater treatment chamber can be adjusted respectively. 3. The continuous fluidized contact wastewater treatment equipment according to claim 1 or 2, wherein different raw wastewater to be treated can flow into the first wastewater treatment chamber and the second wastewater treatment chamber, respectively. 4. The microorganism-supporting carrier is made of plastic, foam thereof, porous ceramics, pellet-like activated carbon, plastic on which microorganisms are immobilized, or plastic whose surface is coated with activated carbon. The continuous fluidized contact wastewater treatment equipment according to any one of claims 1 to 3.