CN110662721A - Sewage treatment device - Google Patents

Abstract

A plurality of contact bodies (22) to which sludge is attached, a nozzle (23) which is provided at a position below the contact bodies (22) and ejects sewage and air into the treatment tank (21), and a guide member (30) which is arranged between the contact bodies (22) and the nozzle (23) are provided in the treatment tank (21). The guide member (30) is formed in a cylindrical shape extending in the vertical direction, and the tip of the guide member (30) becomes thinner as it approaches upward. The flow of the sewage ejected from the nozzle (23) is accelerated when passing through the guide member (30), and the accelerated sewage flow exerts a propelling force on the bubbles.

Description

Sewage treatment device

technical field

The invention relates to a sewage treatment device.

Background technique

Heretofore, a mixed bed for water treatment has been known, in which a filter membrane composed of a row of contact bodies (rope-like filter members) is suspended in a water treatment tank in advance, and sludge is made to adhere to the filter membrane. The microorganisms on the filter membrane are subjected to sludge treatment (for example, refer to Patent Document 1).

Here, when the sludge is to be attached to the filter membrane, for example, sewage is sprayed toward the filter membrane from a nozzle arranged below the filter membrane, and the sewage is diffused from the bottom to the top in the water treatment tank.

Patent Document 1: Japanese Patent No. 2891453

SUMMARY OF THE INVENTION

-Technical problems to be solved by the invention-

However, in the conventional structure, when a plurality of contact bodies are densely arranged, the sludge grows adhering to the contact bodies so as to narrow the gap between the adjacent contact bodies, and as a result, the gap may sometimes be blocked. blocked so that sewage cannot pass through. Furthermore, when the gaps in a part of the contact body rows are blocked, the sewage passes through the gaps between the other contact body rows that have not been blocked.

However, even in the contact body row where the gaps are blocked and the sewage cannot pass, the sludge lumps may only adhere to the lower side of the contact body, but not so much sludge adheres to the upper side of the contact body. In addition, sewage does not flow through the entire water treatment tank, and as a result, uneven distribution of sludge adhesion on the contact body occurs, and there is a problem in that efficient sludge treatment cannot be performed.

The present invention has been made in view of the above-described technical problems, and an object thereof is to suppress clogging of the gaps between the plurality of contact bodies due to adhering sludge.

-Technical solutions for solving technical problems-

The present invention is directed to a sewage treatment device that treats sewage including sludge, and adopts the following solutions.

That is, the first aspect of the invention is characterized in that the sewage treatment apparatus includes a treatment tank, a plurality of contact bodies, a sewage ejection portion, an air ejection portion, and a flow path restriction portion, and the treatment tank stores sewage, and a plurality of The contact body is arranged in the treatment tank, and the sludge is attached to the contact body, the sewage spraying part sprays sewage to the contact body in the treatment tank, and the air is sprayed out The flow path restricting portion restricts the flow path of the sewage ejected from the sewage ejecting portion.

In the first aspect of the invention, there are provided a sewage ejection portion that ejects sewage toward the contact body in the treatment tank, and an air ejection portion that ejects air. The flow rate of the sewage ejected from the sewage ejection portion into the treatment tank is restricted by the flow path restriction portion on the way to the contact body.

According to such a configuration, by restricting the flow rate of the sewage, the sewage can be accelerated, and a pushing force can be applied to the air bubbles. Then, the air bubbles to which the impelling force was applied are caused to collide with the sludge lumps adhering to the contact body.

Here, the central part of the sludge sticking to the linear fixing carrier as the contact body, which is entangled with the linear fixing carrier, becomes hard, and on the other hand, there is no outer part which is firmly wound with the linear fixing carrier. In a state that is easy to peel off. Therefore, by applying an urging force to the air bubbles to the extent that only the outer part of the sludge block can be peeled off, the air bubbles collide with the sludge block, whereby the excess sludge block that blocks the gap between the adjacent contact bodies can be removed. The outer part falls off.

Thereby, by making sewage flow through the entire treatment tank, the sludge adhesion distribution of the plurality of contact bodies does not become uneven, and sludge treatment can be efficiently performed.

In addition, when the contact body is composed of a linear fixed carrier suspended in the treatment tank, when a pushing force is applied to the air bubbles to increase the speed of the air bubbles, Karman vortices are generated, and a large amount of shaking occurs, which causes the formation of air bubbles in the treatment tank. The whole sewage shakes, and the linear fixed carrier is shaken under the influence of the shaking of the sewage, or the air bubbles to which the impelling force is applied directly and violently collide with the linear fixed carrier, so that the linear fixed carrier is shaken, and the easy peeling can be suppressed. Sludge grows, and this sludge is located in the outer part of the sludge block which blocks the sewage flow path.

It should be noted that the sewage ejection portion and the air ejection portion may be constituted by independent nozzles, respectively, or may be constituted by one nozzle that ejects sewage and air in a mixed state.

A second aspect of the invention is the first aspect of the invention, wherein the sewage ejection portion is configured to eject sewage upward from the bottom surface side of the treatment tank.

In the second aspect of the invention, by ejecting sewage upward from the bottom surface side of the treatment tank, the pushing force of the air bubbles toward the contact body is further increased, and the sludge adhering to the contact body is easily dropped.

In addition, when the contact body is composed of a linear fixed carrier suspended in the treatment tank, and the sewage ejection portion is arranged at the center of the bottom surface of the treatment tank, the sewage ejected from the sewage ejection portion is easily supplied to the contactor In the lower central part of the body, the growth of the sludge that only contacts the lower central part of the body is accelerated, and sludge lumps are easily formed in this part, especially the sewage flow path is easily blocked.

Therefore, by arranging the flow path restricting portion above the sewage spouting portion to restrict the flow rate of sewage spouted from the sewage spouting portion, the flow velocity of sewage in the central portion below the contact body can be accelerated, and the sewage can collide violently with the contact body. The bottom central part is used to peel off the sludge, so that the clogging of the sewage flow path due to sludge can be eliminated.

According to a third aspect of the invention, in the second aspect of the invention, the flow path restricting portion is constituted by a guide member formed in a cylindrical shape extending in an up-down direction, and the guide member becomes higher as it approaches the upper side. the thinner the top.

In the third aspect of the invention, the flow of the sewage can be accelerated simply by allowing the sewage to pass through the cylindrical guide member that becomes thinner toward the upper end. In addition, since the guide member has a tapered shape at the tip, the sludge flows down along the inclined surface thereof, and the accumulation of the sludge on the surface of the guide member can be suppressed.

According to a fourth aspect of the invention, in addition to the second aspect of the invention, the flow path restricting portion is formed of a guide member formed in a cylindrical shape extending in the up-down direction and having a part of the inside of the cylinder that shrinks. The systolic part formed.

In the fourth aspect of the invention, the flow of the sewage can be accelerated only by passing the sewage through the cylindrical guide member having the constricted flow portion.

A fifth aspect of the invention is based on the third or fourth aspect of the invention, characterized in that the guide member is arranged between the outer peripheral surface of the guide member and the inner peripheral surface of the processing tank and between the guide member and the guide member. A predetermined gap is left between the lower part and the bottom surface of the processing tank.

In the fifth aspect of the invention, by providing predetermined gaps between the outer peripheral surface of the guide member and the inner peripheral surface of the processing tank and between the lower portion of the guide member and the bottom surface of the processing tank, sewage after passing through the inside of the guide member A part of it circulates so as to be sucked again from the lower side opening of the guide member after passing through the above-mentioned gap. As a result, the sludge accumulated on the bottom surface of the treatment tank can be wound up by the circulating sewage, and the wound sludge can be ejected to the contact body.

According to a sixth aspect of the invention, in any one of the second to fifth aspects of the invention, the ejection port of the sewage ejection portion protrudes upward from the bottom surface of the treatment tank.

In the sixth aspect of the invention, the distance from the sewage spouting portion to the flow path restriction portion can be shortened by projecting the discharge port of the sewage spouting portion upward from the bottom surface of the treatment tank. Thereby, compared with the case where waste water is ejected from the bottom surface of a processing tank, a high ejection force can be obtained with less power.

According to a seventh aspect of the invention, in the sixth aspect of the invention, the sewage treatment device includes an inclined cover that covers the periphery of the protruding portion of the sewage spouting portion, and is characterized in that the further from the treatment tank The bottom surface of the sloping cover is closer to the spouting port of the sewage spouting part, the thinner the top end of the inclined cover is.

In the seventh aspect of the invention, the protruding portion of the sewage spouting portion is covered with an inclined cover with a tapered tip. As a result, it is possible to prevent sludge from accumulating in the corner between the protruding portion of the sewage spouting portion and the bottom surface of the treatment tank, and to accelerate the sewage that has been accelerated by the flow path restriction portion and circulated to the bottom surface side of the treatment tank along the inclination of the inclined cover. The discharge port facing the sewage discharge part is guided smoothly.

An eighth aspect of the invention relates to a sewage treatment device for treating sewage including sludge, characterized in that the sewage treatment device includes a treatment tank, a plurality of contact bodies, a sewage spraying part, and an air In the ejection part, the treatment tank is formed in a cylindrical shape extending in the up-down direction and stores sewage, and a plurality of the contact bodies are arranged in the treatment tank, and the sludge is attached to the contact body, so that the The sewage spraying part is provided at a position lower than the contact body, and sprays the sewage into the treatment tank, and the air spraying part is arranged at a position lower than the contact body, and sprays the sewage into the treatment tank. Air is ejected in the treatment tank, and the sewage ejection portion is configured to eject sewage from the side wall of the treatment tank in a direction along the inner peripheral surface of the treatment tank.

In the eighth aspect of the invention, below the plurality of contact bodies, there are provided a sewage ejection portion for ejecting sewage into the treatment tank, and an air ejection portion for ejecting air. The sewage ejected from the sewage ejection portion flows from the side wall of the treatment tank in a direction along the inner peripheral surface of the treatment tank.

With such a configuration, since the sewage ejected from the sewage ejection portion flows upward while rotating along the inner peripheral surface of the treatment tank, the air bubbles move upward due to the swirl flow and are given an impelling force, which makes it easy to adhere to the contact body The sludge blocks on the drop.

In addition, when a swirling flow that flows upward while swirling is generated in the processing tank, a reverse flow, that is, a downward flow that flows downward, occurs at the center of the swirling flow. This downflow hits the bottom surface, whereby the sludge accumulated on the bottom surface of the treatment tank can be rolled up, and the rolled-up sludge can be ejected to the contact body.

According to a ninth aspect of the invention, in the eighth aspect of the invention, the sewage spraying portion is configured to spray obliquely upward from the side wall of the processing tank in a direction along the inner peripheral surface of the processing tank. out sewage.

In the ninth aspect of the invention, since the sewage ejected from the sewage ejection portion is made to flow from the side wall of the treatment tank to the direction along the inner peripheral surface of the treatment tank and obliquely upward, it is possible to make one side along the side of the treatment tank. The swirl flow that flows while the inner peripheral surface rotates is more actively directed upward. Thereby, the driving force of the air bubbles can be further improved.

A tenth aspect of the invention relates to a sewage treatment device that treats sewage including sludge, characterized in that the sewage treatment device includes a treatment tank, a plurality of contact bodies, a sewage spouting part, an air ejection part and a vibrator, the treatment tank stores sewage, a plurality of the contact bodies are arranged in the treatment tank, and the sludge is attached to the contact body, and the sewage ejection part is arranged in the The air ejection part is provided at a position lower than the contact body and ejects sewage into the treatment tank, and the air ejection part is provided at a position lower than the contact body and ejects the sewage into the treatment tank Air, the vibrator vibrates the bottom surface of the processing tank.

In the tenth aspect of the invention, when the bottom surface of the treatment tank is vibrated by the vibrator, the sewage in the treatment tank fluctuates upward. The air bubbles move upward due to the undulations and are given an impelling force, so that the sludge cakes adhering to the contact body are easily dropped.

-Effect of invention-

According to the present invention, an urging force is applied to the air bubbles and the air bubbles collide with the sludge lumps adhering to the contact bodies, whereby the excess sludge lumps which block the gaps between the adjacent contact bodies can be dropped.

Description of drawings

FIG. 1 is a schematic diagram showing a sludge treatment system including a sewage treatment apparatus according to the first embodiment;

Fig. 2 is a schematic diagram showing the structure of the sewage treatment apparatus;

Fig. 3 is a side sectional view showing the structure around the nozzle;

4 is a side cross-sectional view showing a structure around a nozzle according to the second embodiment;

5 is a side cross-sectional view showing a configuration around a nozzle according to the third embodiment;

6 is a plan cross-sectional view showing a structure around a nozzle according to the fourth embodiment;

Fig. 7 is a side sectional view showing the structure around the nozzle;

8 is a side cross-sectional view showing a structure around a nozzle according to the fifth embodiment;

FIG. 9 is a side cross-sectional view showing a configuration around a nozzle according to the sixth embodiment.

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the descriptions of the following preferred embodiments are merely illustrative in nature, and are not intended to limit the present invention, its application objects, or its uses.

(first embodiment)

As shown in FIG. 1 , the sludge treatment system 10 includes a sewage receiving tank 11 , a primary treatment tank 20 , a secondary treatment tank 40 , and a membrane treatment water tank 50 .

The sewage containing sludge supplied from the outside is stored in the sewage receiving tank 11 . An air supply unit 12 is provided at the bottom of the sewage receiving tank 11 . The air pump 14 is connected to the air supply unit 12 via the air duct 13 . Then, by driving the air pump 14 and opening an on-off valve (not shown), air is supplied into the sewage receiving tank 11 via the air supply unit 12 .

The sewage receiving tank 11 and the primary treatment tank 20 are connected by a first water pipe 15 . A sewage pump 16 is connected to the first water pipe 15 . Then, by driving the sewage pump 16 , the sewage in the sewage receiving tank 11 is supplied to the first overflow receiving tank 24 of the primary treatment tank 20 via the first water pipe 15 , which will be described later.

The primary treatment tank 20 is a sewage treatment device that treats sewage including sludge, and includes a treatment tank 21 in which sewage is stored, a plurality of contact bodies 22 provided in the treatment tank 21 , and ejection into the treatment tank 21 . Nozzles 23 for sewage and air (sewage ejection part, air ejection part). The contact body 22 is composed of a linear fixed carrier capable of capturing sludge.

The processing tank 21 is formed in a cylindrical shape extending in the vertical direction, and a first overflow receiving tank 24 and a second overflow receiving tank 27 are provided on the upper end side thereof.

The first overflow receiving tank 24 receives sewage overflowing from the upper opening of the treatment tank 21 . In addition, the sewage supplied from the first water pipe 15 of the sewage receiving tank 11 also flows into the first overflow receiving tank 24 .

One end of the circulation pipe 25 is connected to the bottom of the first overflow receiving tank 24 . The other end of the circulation pipe 25 is connected to the nozzle 23 attached to the bottom of the processing tank 21 . A circulation pump 26 is connected to the circulation pipe 25 . In addition, the air pump 14 is connected via the air duct 13 at a position on the downstream side of the circulation duct 25 rather than the circulation pump 26 .

Furthermore, by driving the circulating pump 26 and the air pump 14 and opening the on-off valve (not shown), the sewage in the first overflow receiving tank 24 flows to the nozzle 23 via the circulating pipe 25 , and the sewage and air are mixed in the circulating pipe 25 . Thereby, sewage and air are ejected from the nozzle 23 into the treatment tank 21 in a mixed state.

The second overflow receiving tank 27 receives sewage overflowing from the upper opening of the treatment tank 21 . The second water pipe 28 is connected to the bottom of the second overflow receiving tank 27 . The downstream end of the second water pipe 28 is arranged above the secondary treatment tank 40 , and the sewage flowing through the second water pipe 28 from the second overflow receiving tank 27 is supplied to the secondary treatment tank 40 .

The secondary treatment tank 40 is used to remove the untreated portion remaining in the sewage treated by the primary treatment tank 20 . In the secondary treatment tank 40, a plurality of contact bodies 41 to which sludge adheres, and an air supply part 42 arranged below the contact bodies 41 are provided. The air pump 14 is connected to the air supply unit 42 via the air duct 13 . Then, by driving the air pump 14 and opening an on-off valve (not shown), air is supplied into the secondary treatment tank 40 via the air supply unit 42 .

The membrane treatment water tank 50 is provided adjacent to the secondary treatment tank 40 , and the membrane treatment water tank 50 receives the sewage flowing in from the lower opening of the secondary treatment tank 40 . In the membrane treatment water tank 50, a plurality of filter membranes 51 for filtering sewage and an air supply unit 52 arranged at a position lower than the filter membranes 51 are provided. The air pump 14 is connected to the air supply unit 52 via the air duct 13 . Then, by driving the air pump 14 and opening an on-off valve (not shown), air is supplied into the membrane treatment water tank 50 via the air supply unit 52 .

The treated water pipe 53 is connected to the filter membrane 51 . The treatment water pump 54 is connected to the treatment water pipe 53 . Then, the treated water filtered by the filter membrane 51 is discharged from the treated water pipe 53 by driving the treated water pump 54 .

A sludge recovery pipe 55 for recovering sludge is connected to the bottom of the membrane treatment water tank 50 . The sludge pump 56 is connected to the sludge recovery pipe 55 . Then, by driving the sludge pump 56 , the sludge deposited at the bottom of the membrane treatment water tank 50 is recovered from the sludge recovery pipe 55 .

As shown in FIG. 2 , as described above, the primary treatment tank 20 serving as a sewage treatment apparatus is provided with a plurality of contact bodies 22 provided in the treatment tank 21 , and sewage is sprayed upward from the bottom surface side of the treatment tank 21 . and air nozzles 23. The discharge port of the nozzle 23 protrudes upward from the bottom surface of the processing tank 21 .

Then, by ejecting sewage and air from the nozzle 23 to the contacting body 22 , the sludge contained in the sewage is made to adhere to the contacting body 22 . The sludge adhering to the contact body 22 is purified by the action of the bacteria adhering to the contact body 22 .

Here, the plurality of contact bodies 22 are formed of linear fixed carriers capable of capturing sludge, and are arranged to hang down in the up-down direction. The sludge contained in the sewage sprayed from the nozzles 23 adheres to the contact bodies 22 when passing through the gaps between the plurality of contact bodies 22 .

However, if the sludge adheres to the contact bodies 22 and grows, the gap between the adjacent contact bodies 22 will be narrowed by the sludge block, which may eventually block the gap and make it impossible for the sewage to pass through.

Therefore, in the present embodiment, in order to drop the excess sludge that blocks the gap between the adjacent contact bodies 22, the flow of the sewage sprayed from the nozzle 23 is accelerated, and a pushing force is applied to the air bubbles, so that the The air bubbles collide with the sludge adhering to the contact body 22 .

Specifically, as also shown in FIG. 3 , the processing tank 21 is provided with a guide member 30 (a flow path restricting portion) formed in a cylindrical shape extending in the up-down direction, and used to make the spray from the nozzle 23 Sewage and air pass through.

The guide member 30 is an umbrella-shaped body having a substantially conical shape, and has an upper portion and a lower portion opened, and the upper opening is smaller than the lower opening so that the shape becomes thinner toward the upper end.

Furthermore, when the sectional area of the upper opening of the guide member 30 is A, and the flow rate of the sewage ejected from the nozzle 23 is Q, and the sewage ejected from the ejection port of the nozzle 23 passes through the inside of the guide member 30 The flow velocity V of the sewage satisfies the following formula (1).

V=Q/A...(1)

Here, the cross-sectional area of the guide member 30 is gradually narrowed upward, and the flow rate Q of the sewage is constant. That is, by restricting the flow path of the sewage by the guide member 30, the flow path of the sewage is gradually narrowed, the pressure is increased, and only the sewage having the ejection speed that overcomes the pressure is ejected from the nozzle 23, the guide can be The sewage spouted from the upper opening of the member 30 is accelerated.

In addition, the guide member 30 is arranged so as to leave predetermined gaps D1 and D2 between the outer peripheral surface of the guide member 30 and the inner peripheral surface of the processing tank 21 and between the lower portion of the guide member 30 and the bottom surface of the processing tank 21 . When viewed from a side view, the lower part of the guide member 30 overlaps with the ejection port of the nozzle 23 , and the sewage and air ejected from the nozzle 23 reliably pass through the inside of the guide member 30 .

In this way, the flow of the sewage can be accelerated simply by passing the sewage through the cylindrical guide member 30 that becomes thinner toward the upper end. At this time, the air bubbles ejected from the nozzles 23 together with the sewage are given an impelling force by the flow of the accelerated sewage. Furthermore, by directly colliding the contacting body 22 with the air bubbles to which the pushing force has been applied, or by shaking the contacting body 22 due to the influence of the Karman vortex generated by the air bubbles, the excess sludge adhering to the contacting body 22 can be dropped. .

Thus, by eliminating the clogging state between the adjacent contact bodies 22 and allowing the sewage to flow through the entire treatment tank 21, uneven distribution of sludge adhesion on the plurality of contact bodies 22 does not occur, and sludge can be efficiently carried out. deal with.

Furthermore, since the contact body 22 is provided above the opening of the guide member 30, and the nozzle 23 is provided in the lower part of the processing tank 21, the sewage sprayed from the nozzle 23 is sprayed from the bottom to the top. On the other hand, the air bubbles are buoyant due to the And rise, so both sewage and air bubbles travel up. Thereby, the sewage and air bubbles ejected from the nozzle 23 can be made to collide with the contact body 22 violently.

In addition, predetermined gaps D1 and D2 are provided between the outer peripheral surface of the guide member 30 and the inner peripheral surface of the processing tank 21 and between the lower portion of the guide member 30 and the bottom surface of the processing tank 21 , and sewage passes through the inside of the guide member 30 Since it is ejected, the pressure at a position below the opening of the nozzle 23 becomes slightly negative pressure. Therefore, part of the sewage that has passed through the inside of the guide member 30 circulates so as to be sucked again from the lower side opening of the guide member 30 after passing through the gaps D1 and D2.

Thereby, the sludge accumulated on the bottom surface of the treatment tank 21 is rolled up by the circulating sewage, the rolled up sludge is ejected to the contact body 22, and the sludge is attached to the contact body 22 again, whereby it is possible to Reuse of sludge for sludge treatment with microorganisms enables more efficient sewage treatment.

In addition, the sewage is rolled up through the predetermined gaps D1 and D2, and thus the sewage sprayed from the nozzle 23 and the rolled-up sewage merge inside the guide member 30, thereby increasing the flow rate. Here, since the upper opening of the guide member 30 is smaller than the lower opening, the sewage can be further accelerated, and the air bubbles can be further impelled.

(Second Embodiment)

FIG. 4 is a side cross-sectional view showing a configuration around a nozzle according to the second embodiment. Hereinafter, the same reference numerals are assigned to the same parts as those of the above-described first embodiment, and only the differences will be described.

As shown in FIG. 4 , the discharge port of the nozzle 23 protrudes upward from the bottom surface of the processing tank 21 . The periphery of the protruding portion of the nozzle 23 is covered by the inclined cover 32 . The tip of the inclined cover 32 becomes thinner as the inclined cover 32 approaches the discharge port of the nozzle 23 from the bottom surface of the processing tank 21 .

Thereby, the inclined cover 32 can prevent sludge from accumulating in the corner portion between the protruding portion of the nozzle 23 and the bottom surface of the processing tank 21, and the sewage that has passed through the guide member 30 and then circulated to the bottom surface side of the processing tank 21 can be circulated along the The inclined surface of the inclined cover 32 is smoothly guided to the discharge port of the nozzle 23 .

(third embodiment)

FIG. 5 is a side cross-sectional view showing the configuration around the nozzle according to the third embodiment. As shown in FIG. 5 , the treatment tank 21 is provided with a guide member 35 (flow path restricting portion) formed in a cylindrical shape extending in the up-down direction and used to make the sewage and air ejected from the nozzle 23 pass. A constricted flow portion 36 formed by shrinking a part of the guide member 35 is provided in the tube of the guide member 35 . The inside of the tube of the guide member 35 is formed such that the passage area is gradually narrowed from the lower part of the guide member 35 to the constricted flow portion 36 , and the passage area is gradually enlarged from the constricted flow portion 36 to the upper portion of the guide member 35 . The sewage flows along this expanding direction, and the sewage can be diffused to the end of the treatment tank 21 which is usually difficult for the sewage to reach.

In addition, the guide member 35 is arranged so as to leave predetermined gaps D1 and D2 between the outer peripheral surface of the guide member 35 and the inner peripheral surface of the processing tank 21 and between the lower portion of the guide member 35 and the bottom surface of the processing tank 21 . The lower part of the guide member 35 coincides with the ejection port of the nozzle 23 when viewed from the side.

In this way, the flow of the sewage can be accelerated only by passing the sewage through the cylindrical guide member 35 having the constricted flow portion 36, and an impelling force can be applied to the air bubbles by the flow of the accelerated sewage.

(Fourth Embodiment)

FIG. 6 is a plan cross-sectional view showing a configuration around a nozzle according to the fourth embodiment, and FIG. 7 is a side view. As shown in FIG. 6 and FIG. 7 , the nozzle 23 is installed on the side wall of the treatment tank 21 , and the opening hole 23 a opened on the side wall of the treatment tank 21 in a manner of communicating with the nozzle 23 faces the sewage along the direction of the treatment tank 21 . The flow direction of the inner peripheral surface is open.

As a result, the sewage and air ejected from the nozzles 23 are ejected from the side walls of the treatment tank 21 in a direction along the inner peripheral surface of the treatment tank 21 , and are directed upward while rotating along the inner peripheral surface of the treatment tank 21 . flow. Since the air bubbles are moved upward by the swirling flow, a propelling force is applied, and thus the sludge adhering to the contact body 22 is easily dropped.

In addition, when a swirling flow that flows upward while rotating is generated in the processing tank 21, a reverse flow, that is, a downward flow that flows downward, occurs in the center of the swirling flow. This downward flow can wind up the sludge accumulated on the bottom surface of the treatment tank 21 , and can eject the wound up sludge to the contact body 22 .

(Fifth Embodiment)

FIG. 8 is a side cross-sectional view showing a configuration around a nozzle according to the fifth embodiment. As shown in FIG. 8 , the nozzle 23 is installed on the side wall of the treatment tank 21 , and the opening hole 23 a opened on the side wall of the treatment tank 21 in a way of communicating with the nozzle 23 is directed toward the sewage along the inner peripheral surface of the treatment tank 21 The direction of flow and open towards the obliquely upward.

As a result, the sewage and air ejected from the nozzles 23 are ejected obliquely upward from the side wall of the treatment tank 21 toward the direction in which the sewage flows along the inner peripheral surface of the treatment tank 21 and along the inner surface of the treatment tank 21 . The peripheral surface rotates while flowing. Here, since the ejection direction of the nozzle 23 is set so that the swirl flow is more actively directed upward, the driving force for the air bubbles can be further improved.

(Sixth Embodiment)

FIG. 9 is a side cross-sectional view showing a configuration around a nozzle according to the sixth embodiment. As shown in FIG. 9 , a vibrator 38 for vibrating the bottom surface of the processing tank 21 is attached to the bottom surface of the processing tank 21 . In the example shown in FIG. 9 , two vibrators 38 are provided so as to sandwich the nozzle 23 . Furthermore, the number of vibrators 38 is not limited to this.

The vibrator 38 is constituted by an air hammer or the like, and is attached so as to be inclined with respect to the bottom surface of the processing tank 21 so that the vibration generated by the vibrator 38 is transmitted to the central portion of the processing tank 21 .

Here, when two vibrators are used to vibrate the bottom surface of the treatment tank 21, two waves are generated in the sewage in the treatment tank 21 as shown by the dotted line in FIG. The central part is produced obliquely upward. The two waves generated by the two vibrators 38 converge at a position above the nozzle 23 .

As a result, the air bubbles ejected from the nozzles 23 are moved upward by the undulations generated by the vibrator 38 to be propelled, and the sludge adhering to the contact body 22 is easily dropped.

(Other Embodiments)

The above-described embodiments may have the following structures.

In the present embodiment, sewage and air are mixed in the circulation duct 25, and the sewage and air are ejected from one nozzle 23, but the present invention is not limited to this. For example, a sewage ejection part which ejects sewage and an air ejection part which ejects air may be constituted by separate nozzles.

In addition, in the present embodiment, the configuration in which the linear fixed carrier is used as the contact body 22 has been described, but a block-shaped fixed carrier may be used as the contact body 22 .

－Industrial Applicability－

As described above, the present invention is extremely useful and has high industrial applicability since it can obtain the highly practical effect of suppressing the clogging of the gaps between the plurality of contact bodies by the adhering sludge.

-Symbol Description-

20 Primary treatment tank (sewage treatment device)

21 processing tank

22 Contacts

23 Nozzle (sewage ejection part, air ejection part)

30 Guide member (flow path restricting part)

32 Tilt cover

35 Guide member (flow path restricting part)

36 Constriction

38 Vibrator

D1, D2 clearance

Claims (10)

1. A sewage treatment device, which treats sewage including sludge, characterized in that: The sewage treatment device includes a treatment tank, a plurality of contact bodies, a sewage spouting part, an air spouting part, and a flow path restricting part, The treatment tank accumulates sewage, A plurality of the contact bodies are arranged in the treatment tank, and the sludge is attached to the contact bodies, The sewage ejection part ejects sewage to the contact body in the treatment tank, The air ejection part ejects air into the treatment tank, The flow path restricting portion restricts the flow path of sewage ejected from the sewage ejecting portion. 2. The sewage treatment device according to claim 1, wherein: The sewage ejection portion is configured to eject sewage upward from the bottom surface side of the treatment tank. 3. The sewage treatment device according to claim 2, wherein: The flow path restricting portion is constituted by a guide member formed in a cylindrical shape extending in the up-down direction, and the distal end of the guide member becomes thinner toward the upper side. 4. The sewage treatment device according to claim 2, wherein: The flow path restricting portion is constituted by a guide member formed in a cylindrical shape extending in the up-down direction and having a constricted flow portion formed by shrinking a part of the inside of the cylinder. 5. The sewage treatment device according to claim 3 or 4, characterized in that: The guide member is arranged so as to leave a prescribed gap between the outer peripheral surface of the guide member and the inner peripheral surface of the processing tank and between the lower portion of the guide member and the bottom surface of the processing tank. 6. The sewage treatment device according to any one of claims 2 to 5, characterized in that: The discharge port of the waste water discharge part protrudes upward from the bottom surface of the treatment tank. 7. The sewage treatment device according to claim 6, wherein: The sewage treatment device includes an inclined cover that covers the periphery of the protruding portion of the sewage spouting portion, and the top end of the inclined cover becomes closer to the spouting port of the sewage spouting portion from the bottom surface of the treatment tank. the finer. 8. A sewage treatment device for treating sewage including sludge, characterized in that: The sewage treatment device includes a treatment tank, a plurality of contact bodies, a sewage spouting part and an air spouting part, The treatment tank is formed in a cylindrical shape extending in the up-down direction, and stores sewage, A plurality of the contact bodies are arranged in the treatment tank, and the sludge is attached to the contact bodies, The sewage spraying part is arranged at a position lower than the contact body, and sprays the sewage into the treatment tank, The air ejection part is provided at a position lower than the contact body, and ejects air into the processing tank, The sewage ejection part is configured to eject sewage from the side wall of the treatment tank in a direction along the inner peripheral surface of the treatment tank. 9. The sewage treatment device according to claim 8, wherein: The sewage ejection part is configured to eject sewage from the side wall of the treatment tank in a direction along the inner peripheral surface of the treatment tank and obliquely upward. 10. A sewage treatment device for treating sewage including sludge, characterized in that: The sewage treatment device includes a treatment tank, a plurality of contact bodies, a sewage ejection part, an air ejection part and a vibrator, The treatment tank accumulates sewage, A plurality of the contact bodies are arranged in the treatment tank, and the sludge is attached to the contact bodies, The sewage spraying part is arranged at a position lower than the contact body, and sprays the sewage into the treatment tank, The air ejection part is provided at a position lower than the contact body, and ejects air into the processing tank, The vibrator vibrates the bottom surface of the processing tank.

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