JP2015051415A - Waste water treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To treat waste water with high efficiency and stably.SOLUTION: The waste water treatment device comprises: a reaction tank 1 in which microbes are filled and into which waste water to be treated is introduced; a net-like member 2 for partitioning inside of the reaction tank 1 into plural sections 21 in a vertical direction; and plural porous carriers 3 filled in the respective sections 21 partitioned by the net-like member 2.

Description

  The present invention relates to a wastewater treatment apparatus.

  The following Patent Document 1 discloses a wastewater treatment apparatus that realizes a significant space saving while ensuring a wastewater treatment performance equivalent to or higher than that of a conventional sponge carrier activated sludge method. The wastewater treatment apparatus is a net-like reaction vessel that stands upright with respect to a horizontal plane and has an upper end opened and a lower end closed, and the reaction vessel is partitioned into an upper supported compartment and a lower unsupported compartment. A member, and an air diffuser that diffuses an oxygen-containing gas supplied from the outside into the reaction tank. The reaction tank is filled with microorganisms such as activated sludge and a plurality of porous carriers, and waste water is introduced from the upper end. Further, the net member prevents the movement of the porous carrier from the supported compartment to the non-carrier compartment.

JP 2012-187557 A

  By the way, in the above prior art, by ensuring the fluidity in the reaction vessel by suppressing the filling rate of the carrier (the amount of the carrier per unit area) to 30% or less, the stability of the treatment in the reaction vessel is ensured. ing. On the other hand, in order to increase the processing efficiency (increase the processing capacity per unit time), it is conceivable that the filling rate of the carrier exceeds 30%, but the fluidity in the reaction vessel is lost. As a result, the properties of the waste water in the reaction tank become non-uniform, and the arrangement of the carrier in the reaction tank becomes non-uniform, so that the state of the microorganisms in the support becomes non-uniform and the treatment in each place in the reaction tank Capability varies and processing stability is lost. In other words, in the above prior art, when the carrier filling rate exceeds 30%, the uniformity in the reaction vessel is lost, so that the processing efficiency is reduced (the processing capacity is lower than the increased amount of the carrier). The processing performance is not stable. As described above, in the above-described conventional technology, it is difficult to improve efficiency while stabilizing the processing.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to treat wastewater with high efficiency and stability.

  In order to achieve the above object, in the present invention, as a first solution, the reaction vessel into which microorganisms are charged and the waste water to be treated is introduced, and the reaction vessel are partitioned into a plurality of compartments in the vertical direction. A means is provided that includes a mesh member and a plurality of porous carriers filled in each section partitioned by the mesh member.

  In the present invention, as a second solving means, in the first solving means, each section is partitioned by the mesh member so as to have a height at which only one porous carrier can be arranged. Adopt a means of being arranged horizontally.

  In the present invention, as the third solution means, in the second solution means, a means is adopted in which each section is divided into a plurality of small sections by being partitioned vertically by a mesh member.

  In the present invention, as a fourth solving means, in the third solving means, each compartment is vertically partitioned by a net-like member, so that one central compartment arranged in the center and the periphery of the central compartment A method is adopted in which it is divided into a plurality of surrounding compartments arranged in the area.

  In the present invention, as a fifth solving means, in each of the third solving means, each compartment is vertically partitioned by a net-like member, so that a plurality of the porous carriers can be arranged in a size. Adopting the means of being divided into small sections.

  In the present invention, as the sixth solving means, the means of introducing waste water from the upper part of the reaction tank in any one of the first to fifth solving means is adopted.

  In the present invention, as a seventh solving means, a means of introducing waste water from the lower part of the reaction vessel in any one of the first to fifth solving means is adopted.

  According to the present invention, the inside of the reaction tank is divided into a plurality of compartments in the vertical direction by the mesh member, and each compartment is filled with a plurality of porous carriers, whereby the porous carriers are pushed up with the aerated air. Even so, the porous carrier remains in each compartment. Therefore, even if the filling rate of the porous support | carrier in a reaction tank is made high in this invention, waste water can be processed efficiently and stably.

1 is a schematic configuration diagram of a wastewater treatment apparatus according to a first embodiment of the present invention. It is a top view of the support | carrier division 21c of the wastewater treatment apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the experimental result of the conventional wastewater treatment apparatus and the wastewater treatment apparatus which concerns on 1st Embodiment of this invention. It is a top view of the carrier division 21c of the wastewater treatment apparatus which concerns on 2nd Embodiment of this invention. It is a top view of the carrier division 21c of the wastewater treatment apparatus which concerns on 3rd Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
First, the first embodiment will be described. As shown in FIG. 1, the wastewater treatment apparatus according to the first embodiment includes a reaction tank 1, a screen 2, a porous carrier 3, a wastewater introduction pipe 4, an introduction pump 5, an air diffuser 6, and a treated water discharge pipe 7. , A treated water tank 8, a defoaming device 9, a foam detection sensor 10, and a control device 11. This wastewater treatment apparatus decomposes organic substances contained in wastewater (treatment target wastewater) introduced into the reaction tank 1 from the outside through a wastewater introduction pipe 4 using microorganisms. In addition, the said waste water is used for a nondestructive inspection, for example, and contains the osmosis | permeation liquid which has fluorescent dye and red dye.

  The reaction tank 1 is a cylindrical container that stands upright with respect to a horizontal plane, has an air vent hole at the upper end, and is closed at the lower end. In addition, the horizontal cross-sectional shape of this reaction tank 1 may be circular or polygonal. The reaction tank 1 is pre-filled with a plurality of porous carriers 3 in which microorganisms have settled, and waste water is introduced from a waste water introduction pipe 4 that passes through the upper part of the side surface and is provided above the uppermost screen 2. The

  A plurality of screens 2 are provided in a horizontal state with intervals in the vertical direction in the reaction tank 1, and are planar net-like members that partition the reaction tank 1 into a plurality of compartments 21 in the vertical direction. Hereinafter, the section 21 below the lowermost screen 2 is referred to as a first carrier-free section 21a. The section 21 between the uppermost screen 2 and the second screen 2 from the top is referred to as a second carrier-free section 21b. Furthermore, each section 21 from the lowermost screen 2 to the second screen 2 is referred to as a supported section 21c in which the porous carrier 3 is disposed.

  Each supported section 21c is set to a height at which only one porous carrier 3 can be disposed, as shown in FIG. FIG. 2 shows a plan view of each supported section 21c when the horizontal cross-sectional shape of the reaction tank 1 is circular. Further, the screen 2 that partitions each compartment 21 (the first carrier-free compartment 21a, the second carrier-free compartment 21b, and the carrier-containing compartment 21c) allows liquid (including activated sludge) to pass but does not allow the porous carrier 3 to pass. It has many voids and prevents the porous carrier 3 from moving to different compartments 21.

The porous carrier 3 is, for example, a polyurethane foam formed in a cubic shape. A general polyurethane foam is synthesized from a polyol and an isocyanate. The conditions for the polyurethane foam used for the treatment of the waste water containing the above-mentioned penetrating liquid are that the polyol is a polyether polyol, and the bubbles are connected cells. In order to achieve high processing efficiency, it is desirable that the specific gravity is 0.03 g / cm ³ or less. As shown in FIG. 1, the porous carrier 3 is horizontally disposed in each of the supported carrier sections 21c.

The waste water introduction pipe 4 has one end connected to the introduction pump 5, the other end passing through the upper part of the side surface of the reaction tank 1 and disposed above the uppermost screen 2, and one end of the waste water introduction pipe 4. 5 and the other end is constituted by a waste water suction pipe 4b provided in waste water stored in a tank (not shown). Further, the waste water delivery pipe 4 a is provided with a plurality of holes for discharging waste water toward the reaction tank 1 on the peripheral surface of the other end located above the uppermost screen 2.
The introduction pump 5 is connected to one end of the waste water delivery pipe 4a and one end of the waste water suction pipe 4b, and pumps waste water stored in a tank (not shown) and supplies it to the reaction tank 1.

  The air diffuser 6 is installed directly below the lowermost screen 2 and diffuses oxygen-containing gas such as air supplied from the outside into the reaction tank 1. The amount of air (aeration amount) supplied (aerated) from the aeration device 6 into the reaction tank 1 is various, such as the size of the reaction tank 1, the size of the porous carrier 3, the filling rate and material, and the properties of waste water. What is necessary is just to set suitably according to conditions.

The treated water discharge pipe 7 has one end communicating with the first carrier-free section 21 a on the lower side of the lowermost screen 2 and the other end extending to the same height as the liquid level of the reaction tank 1 and opening. It is. The treated water discharge pipe 7 overflows at the same height as the liquid level of the reaction tank 1 using the liquid (purified waste water) accumulated in the first carrier-free compartment 21a of the reaction tank 1 as treated water. Is.
The treated water tank 8 is a container for storing waste water discharged by the treated water discharge pipe 7.

  The defoaming device 9 removes gas (bubbles) mixed in the wastewater reaching the lower part of the uppermost screen 2. Since the viscosity of the waste water is high due to the inclusions, bubbles are easily generated by the air diffused by the air diffuser 6. The defoaming device 9 is for removing bubbles generated in the wastewater by the air diffused by the air diffuser 6.

  The bubble detection sensor 10 is, for example, a conductivity type sensor (a sensor that determines the presence or absence of bubbles based on a change in electrical conductivity), detects bubbles overflowing beyond the uppermost screen 2, and indicates the detection result. A detection signal is output to the control device 11. As the bubble detection sensor 10, an optical sensor or an ultrasonic sensor may be used instead of the conductivity sensor.

  The control device 11 is a control circuit composed of various elements, and controls a valve (not shown) and an air diffuser 6 provided in the wastewater introduction pipe 4 based on a detection signal input from the foam detection sensor 10. . For example, when a detection signal indicating bubble detection is input from the bubble detection sensor 10, the control device 11 controls to stop the introduction pump and to control the air diffuser 6. That is, the control device 11 is a control circuit for creating a state in which bubbles are not generated by stopping waste water and aeration, and preventing overflow.

The above is description regarding the structure of the waste water treatment apparatus which concerns on 1st Embodiment, Below, it demonstrates in detail about the waste water treatment in the waste water treatment apparatus comprised as mentioned above, and a characteristic effect | action and effect.
At the start of operation of the introduction pump 5, waste water is introduced into the reaction tank 1 from a waste water introduction pipe 4 that passes through the upper part of the side surface of the reaction tank 1 and is provided above the uppermost screen 2. Since the waste water flows downward in the reaction tank 1, as a result, a downward flow is formed in the reaction tank 1. On the other hand, the air diffuser 6 diffuses air (oxygen) into the reaction tank 1. The air supplied into the reaction tank 1 by the air diffuser 6 rises from the first carrier-free compartment 21 a toward the carrier-containing compartment 21 c and is supplied to the microorganisms attached to the porous carrier 3.

  As described above, the downward flow formed in the reaction tank 1 promotes the contact between the waste water and the porous carrier 3 (microorganisms adhering thereto), and the decomposition of organic substances contained in the waste water by the microorganisms is promoted. The waste water is purified as it descends below the carrier-supported compartment 21c, and waste water with a low organic matter content accumulates in the first carrier-free compartment 21a.

  The liquid (purified waste water) collected in the first carrier-free compartment 21a of the reaction tank 1 gradually rises through the treated water discharge pipe 7 and is the same as the liquid level of the reaction tank 1 in the treated water discharge pipe 7. When reaching the height position, it flows out from the treated water discharge pipe 7 to the outside as treated water (overflow). Further, the defoaming device 9 removes bubbles mixed in the waste water reaching the lower part of the uppermost screen 2.

  On the other hand, bubbles are generated in the upper layer in the reaction tank 1 by the air that has been diffused by the air diffuser 6 and floated. The bubbles accumulate in the second carrier-free compartment 21b and overflow beyond the uppermost screen 2 when the capacity of the second carrier-free compartment 21b is exceeded. When the control device 11 detects that the foam overflows beyond the uppermost screen 2 based on the detection signal from the foam detection sensor 10, the control device 11 controls to stop the introduction pump so as to stop the inflow of waste water. In addition, the air diffuser 6 is stopped. That is, the control device 11 performs control so as to stop waste water and aeration in order to prevent overflow.

  Here, the first embodiment has the following characteristic operations and effects. In other words, in the first embodiment, each supported compartment 21c is partitioned by the screen 2 so as to have a height at which only one porous support 3 can be arranged, and a plurality of porous supports are provided in each supported compartment 21c. 3 is arranged horizontally. For this reason, even if the porous carrier 3 is pushed up by the air diffused by the air diffuser 6, the porous carrier 3 remains in each of the supported compartments 21. Therefore, even if the filling rate of the porous carrier 3 in the reaction tank 1 is higher than 30%, the uniformity in the tank in the reaction tank 1 can be ensured. As a result, the first embodiment enables highly efficient and stable wastewater treatment.

  The inventor of the present application has produced and experimented with a conventional wastewater treatment device (a device for treating the wastewater by flowing the porous carrier 3) and the wastewater treatment device according to the first embodiment. The results will be described. In addition, in the experiment, although the properties of the wastewater introduced into each wastewater treatment apparatus vary, the average value of “CODCr” is “700 mg / L” and “normal hexane extractant” is “80 mg / L”. It is. Moreover, this waste water is hardly decomposable (BOD / CODCr ratio is 0.2 or less). Further, a 25 mm square cube is used as the porous carrier 3.

  The result of the experiment is as shown in FIG. From the experimental results, the wastewater treatment apparatus according to the first embodiment has a “treatment amount per reaction tank capacity (comparison result of treatment amount / comparison result of reaction tank capacity)” as compared with the conventional one. .01 times (9.87 / 2.46) ". Further, from the experimental results, the waste water treatment apparatus according to the first embodiment has a “treatment amount per carrier (comparison result of treatment amount / comparison result of carrier amount)” of “2” compared with the conventional one. .35 times (9.87 / 4.2) ". That is, the wastewater treatment apparatus according to the first embodiment is extremely superior to the conventional wastewater treatment apparatus from the viewpoints of “amount treated per reaction tank capacity” and “amount treated per carrier”.

  According to the first embodiment as described above, the inside of the reaction tank 1 is partitioned into the plurality of supported compartments 21c by the screen 2 in the vertical direction, and each of the supported compartments 21c can arrange only one porous carrier 3. The plurality of porous carriers 3 are horizontally arranged in each of the supported compartments 21c. For this reason, in the first embodiment, even if the porous carrier 3 is pushed up by the air diffused by the air diffuser 6, the porous carrier remains in each of the supported compartments 21c. Therefore, even if the filling rate of the porous carrier 3 in the reaction tank 1 is higher than 30%, the first embodiment can ensure uniformity in the tank in the reaction tank 1. As a result, the first embodiment enables highly efficient and stable wastewater treatment. For example, in the first embodiment, the filling rate of the porous carrier 3 can be up to 70%.

  In addition, according to the first embodiment, since the porous carrier 3 does not flow, the porous carrier 3 is hardly worn and the life of the porous carrier 3 can be extended. Further, conventionally, since the porous carrier 3 to which microorganisms have adhered is difficult for air to pass through, it is easy for the air to accumulate inside and to float. However, in the first embodiment, since each screen 2 is installed in the reaction tank 1, the floating of the porous carrier 3 can be prevented. In addition, according to the first embodiment, since the distribution of the porous carrier 3 is less likely to be biased, short paths of waste water and air in the reaction tank 1 caused by the bias of the distribution of the porous carrier 3 are less likely to occur.

[Second Embodiment]
Next, a wastewater treatment apparatus according to the second embodiment will be described.
Unlike the first embodiment, the wastewater treatment apparatus according to the second embodiment includes a screen 32 shown in FIG. 4 instead of the screen 2. The components other than the screen 32 are the same as those in the first embodiment. Accordingly, the description of the same components in the second embodiment as those in the first embodiment is omitted.

  As shown in FIG. 4, the screen 32 is formed in a cylindrical shape by being provided in the same plane as the first mesh member 32 a in the same manner as the screen 2 of the first embodiment and perpendicularly to the center on the first mesh member 32 a. The second mesh member 32b and eight planar third mesh members 32c provided perpendicular to the first mesh member 32a and radially about the second mesh member 32b. Yes. Each of the third mesh members 32c is in contact with the circumferential surface of the second mesh member 32 having one cylindrical end, and the other side end is in contact with the inner surface of the reaction tank 1, so that the second mesh member 32b It arrange | positions at equal intervals with respect to a surrounding surface.

  When a plurality of the screens 32 are stacked in the reaction tank 1 in the vertical direction, the reaction tank 1 has a plurality of porous carriers 3 in the vertical direction by the first mesh member 32a in the same manner as in the first embodiment. It is partitioned into carrier-supported compartments 21c having a height that can be arranged only by one. Furthermore, each of the supported compartments 21c is vertically partitioned by the second mesh member 32b and the third mesh member 32c, and as shown in FIG. 4, a central compartment c1 surrounded by the second mesh member 32b, It is divided into eight surrounding sections c2 arranged around the central section c1. In the central compartment c1 and the surrounding compartment c2, the porous carrier 3 is horizontally arranged as in the first embodiment. In addition, since there are eight third mesh members 32c, there are eight surrounding sections c2. However, the number of the third mesh members 32c may be changed so that the number of surrounding sections c2 is other than eight. .

Next, characteristic operations and effects of the second embodiment configured as described above will be described in detail. In addition, since it is the same as that of 1st Embodiment about waste water treatment, description is abbreviate | omitted.
In the second embodiment, each of the supported compartments 21c is partitioned by the screen 2 so as to have a height at which only one porous carrier 3 can be arranged, as in the first embodiment. Further, each of the supported compartments 21c is vertically partitioned by the second mesh member 32b and the third mesh member 32c, and is arranged around the central compartment c1 and the central compartment c1 as shown in FIG. Divided into eight surrounding sections c2. A plurality of porous carriers 3 are horizontally arranged in the central section c1 and the surrounding section c2.

  According to the second embodiment as described above, even when the porous carrier 3 is pushed up by the air diffused by the air diffuser 6, the porous carrier 3 remains in each central compartment c1 and each surrounding compartment c2. Therefore, this 2nd Embodiment can ensure the uniformity in the tank in the reaction tank 1, even if the filling rate of the porous support | carrier 3 in the reaction tank 1 is made higher than 30%. Further, in the second embodiment, the supported carrier section 21c is finely divided into the central section c1 and the surrounding section c2, so that the distribution of the porous carrier 3 in the reaction tank 1 is more biased than the first embodiment. Hard to occur. As a result, the second embodiment enables highly efficient and stable wastewater treatment.

  Further, the waste water treatment apparatus is a several-meter scale apparatus, and the screen 32 also needs to be disassembled and manufactured. In the second embodiment, one screen 32 can be easily manufactured by disassembling and manufacturing the central section c1 and the peripheral section c2, and assembling them.

  Further, according to the second embodiment, since the porous carrier 3 does not flow, the porous carrier 3 is hardly worn and the life of the porous carrier 3 can be extended. Further, conventionally, since the porous carrier 3 to which microorganisms have adhered is difficult for air to pass through, it is easy for the air to accumulate inside and to float. However, in the second embodiment, since the screens 32 are installed in the reaction tank 1, the floating of the porous carrier 3 can be prevented. In addition, according to the second embodiment, since the distribution of the porous carrier 3 is less likely to be biased, a short path of waste water and air in the reaction tank 1 caused by the bias of the distribution of the porous carrier 3 is less likely to occur.

[Third Embodiment]
Next, a wastewater treatment apparatus according to the third embodiment will be described.
Unlike the first embodiment, the wastewater treatment apparatus according to the third embodiment includes a screen 42 shown in FIG. 5 instead of the screen 2. The components other than the screen 42 are the same as those in the first embodiment. Therefore, the description of the same components in the third embodiment as those in the first embodiment is omitted.

  As shown in FIG. 5, the screen 42 includes a first mesh member 42 a having the same planar shape as the screen 2 of the first embodiment, and a plurality of parallel meshes provided perpendicularly to the first mesh member 42 a at equal intervals. The second mesh member 42b is composed of a plurality of parallel third mesh members 42c that are perpendicular to the first mesh member 42a and perpendicular to the second mesh member 42b and provided at equal intervals. The second mesh member 42b and the third mesh member 42c are set at the same height.

  When the plurality of screens 42 are stacked in the vertical direction in the reaction tank 1, a plurality of the porous carriers 3 are vertically stacked in the reaction tank 1 by the first mesh member 42 a as in the first embodiment. It is partitioned into carrier-supported compartments 21c having a height that can be arranged only by one. Further, each of the supported compartments 21c is vertically partitioned by the second mesh member 42b and the third mesh member 42c, and is divided into a plurality of small compartments c3 in a lattice shape as shown in FIG. Such a small section c3 has such a size that only one porous carrier can be arranged, and one porous carrier 3 is arranged one by one.

Next, characteristic operations and effects of the third embodiment configured as described above will be described in detail. In addition, since it is the same as that of 1st Embodiment about waste water treatment, description is abbreviate | omitted.
In the third embodiment, each supported section 21c is partitioned by the screen 2 so that only one porous carrier 3 can be arranged, as in the first embodiment. Each of the supported compartments 21c is partitioned vertically by the second mesh member 42b and the third mesh member 42c, and is divided into a plurality of small compartments c3 in a lattice shape as shown in FIG. Such a small section c3 has such a size that only one porous carrier can be arranged, and one porous carrier 3 is arranged one by one.

  According to the third embodiment, even when the porous carrier 3 is pushed up by the air diffused by the air diffuser 6, the porous carrier 3 remains in the small section c3. Therefore, even if the filling rate of the porous carrier 3 in the reaction tank 1 is made higher than 30%, the third embodiment can ensure uniformity in the tank in the reaction tank 1. Further, in the third embodiment, since the supported-carrier section 21c is finely divided into small sections c3, the distribution of the porous carrier 3 in the reaction tank 1 is less likely to be biased than in the first embodiment. As a result, the third embodiment enables highly efficient and stable wastewater treatment.

  Further, according to the third embodiment, since the porous carrier 3 does not flow, the porous carrier 3 is hardly worn and the life of the porous carrier 3 can be extended. Further, conventionally, since the porous carrier 3 to which microorganisms have adhered is difficult for air to pass through, it is easy for the air to accumulate inside and to float. However, in the third embodiment, since the screens 42 are installed in the reaction tank 1, the floating of the porous carrier 3 can be prevented. Further, according to the third embodiment, since the distribution of the porous carrier 3 is less likely to be biased, a short path of waste water and air in the reaction tank 1 caused by the bias of the distribution of the porous carrier 3 is less likely to occur.

In addition, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the first to third embodiments, each of the supported compartments 21c is set to a height at which only one porous carrier 3 can be arranged, but the present invention is not limited to this. The reaction tank 1 may be divided into a plurality of supported compartments 21c in the vertical direction, and the height is not limited to a height at which only one porous carrier 3 can be arranged.

(2) In the first to third embodiments, the wastewater is introduced from the upper part of the reaction tank 1 by the wastewater introduction pipe 4, but the present invention is not limited to this. For example, a waste water introduction pipe 4 that communicates with the first carrier-free section 21 a below the lowermost screen 2 in the reaction tank 1 may be provided, and waste water may be introduced from the lower part in the reaction tank 1. The reason why the waste water can be introduced from the lower part in the reaction tank 1 is that the floating of the porous carrier 3 is prevented by the screens 2, 32 and 42. That is, when waste water is introduced from the lower part, both the waste water and the air generated by the air diffuser 6 become an upward flow, so that the porous carrier 3 is likely to float. However, in the first to third embodiments, since the floating of the porous carrier 3 is prevented by the screens 2, 32, 42, even if the porous carrier 3 is likely to float by introduction of waste water from the bottom, no problem.

  DESCRIPTION OF SYMBOLS 1 ... Reaction tank, 2 ... Screen, 3 ... Porous support | carrier, 4 ... Waste water introduction pipe, 5 ... Introduction pump, 6 ... Air diffuser, 7 ... Treated water discharge pipe, 8 ... Treated water tank, 9 ... Defoamer DESCRIPTION OF SYMBOLS 10 ... Bubble detection sensor, 11 ... Control apparatus, 21 ... Compartment, 21a ... First carrier-free compartment, 21b ... Second carrier-free compartment, 21c ... Carrier-bearing compartment, 4a ... Waste water delivery pipe, 4b ... Waste water suction Tube, 32 ... screen, 32a ... first mesh member, 32b ... second mesh member, 32c ... third mesh member, c1 ... central compartment, c2 ... surrounding compartment, 42 ... screen, 42a ... first mesh Member, 42b ... second mesh member, 42c ... third mesh member, c3 ... small section

Claims (7)

A reaction tank into which wastewater to be treated is introduced while being filled with microorganisms;
A net-like member that partitions the inside of the reaction tank into a plurality of sections in the vertical direction;
A wastewater treatment apparatus comprising: a plurality of porous carriers filled in each section partitioned by the mesh member.   2. The wastewater treatment according to claim 1, wherein each section is partitioned by the mesh member so as to have a height at which only one porous carrier can be arranged, and the porous carrier is arranged horizontally. apparatus.   The wastewater treatment apparatus according to claim 2, wherein each section is divided into a plurality of small sections by being partitioned vertically by a net-like member.   Each compartment is partitioned vertically by a mesh member, so that it is divided into one central compartment arranged at the center and a plurality of peripheral compartments arranged around the central compartment. The wastewater treatment apparatus according to claim 3.   The wastewater according to claim 3, wherein each compartment is vertically partitioned by a mesh member to divide the compartment into a plurality of small compartments having a size capable of arranging only one porous carrier. Processing equipment.   The waste water treatment apparatus according to claim 1, wherein waste water is introduced from an upper part of the reaction tank.   The wastewater treatment apparatus according to claim 1, wherein wastewater is introduced from a lower part of the reaction tank.

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