JP2005254029A - Solid-liquid separation mechanism and organic wastewater treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic wastewater treatment apparatus constituted so as to return the sediment from a sedimentation part into the sedimentation part by a floating gas to prevent the same from whirling up. <P>SOLUTION: The organic wastewater treatment apparatus is equipped with a treatment tank 11 having a reaction part 12 formed to its bottom part, a supply pipe 21 for supplying organic wastewater into the reaction part 12, the sedimentation part 31 of which the upper end is protruded from the surface of the water, the gas collection part 41 arranged under the sedimentation part 31 to collect the gas floating to the underside opening 36a of the sedimentation part 31, an exhaust pipe 42 for exhausting the gas in the gas collection part 41 from the surface of the water, the spiral passage forming member 51 arranged in the sedimentation part 31 to form a spiral passage 52, a treated water supply part 71 for supplying the treated water outside the sedimentation part 31 to the area under the spiral passage forming member 51 in the sedimentation part 31, a drain part 81 for discharging the treated water in the sedimentation part 31 to the outside of the treatment tank 11 and an annular baffle plate 91 for preventing the gas from flowing in the opening 36a of the sedimentation part 31 and passing the sediment from the opening 36a through the gas collection part 41. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a solid-liquid separation mechanism for separating a solid-liquid mixed liquid into a solid and a liquid, and an organic substance in an organic wastewater, an granule composed of anaerobic microorganisms constituting an anaerobic sludge layer, and a precursor thereof. The self-granulating sludge (which is also simply referred to as “sludge”), which is a granule with a small particle size, is finally decomposed into an anaerobic gas mainly composed of methane and carbon dioxide to remove organic matter. It is related with the organic waste water treatment apparatus which isolate | separates and discharges the treated water which decomposed | disassembled from the generated anaerobic gas and sludge.

A conventional organic wastewater treatment device supplies treated water to a sedimentation section in a tangential direction to generate a swirl that swirls in the sedimentation section, and sinks sludge contained in the treated water using this swirl. The sludge is removed from the treated water.
Japanese National Patent Publication No. 7-507233 JP-A-10-165980

The organic waste water treatment apparatus described in Patent Document 1 described above supplies the gas floating from the reaction part together with the treated water to the outside of the precipitation part, floats it, releases it to the atmosphere, and then treats the treated water in the precipitation part. It is set as the structure which isolate | separates sludge from.
However, since the sedimentation part is bottomed, a return mechanism for returning the sediment (sludge) in the sedimentation part to the reaction part is required.

Next, although the organic waste water treatment apparatus described in Patent Document 2 includes a mechanism for collecting and discharging the gas floating from the reaction part, a partition wall is provided outside the precipitation part to provide a precipitation part. Since the inflow of gas into the air is blocked, the configuration is complicated.
Moreover, since the sedimentation part has a bottom, the organic waste water treatment apparatus described in patent document 2 requires the return mechanism for returning the deposit in a precipitation part to a reaction part.

The present invention is as follows.
(1) The solid-liquid separation mechanism of the present invention has a precipitation part having a cylindrical part whose upper and lower ends are open and whose upper end protrudes above the water surface, and an opening below the precipitation part that is disposed below the precipitation part. A gas collecting part that spreads downward to collect the gas that floats toward the bottom, an exhaust pipe that has a lower end connected to the gas collecting part, and discharges the gas in the gas collecting part onto the water surface, and the precipitation A spiral path forming member that is disposed in the section and forms a spiral path from below to above, and a treated water supply section that supplies treated water outside the settling section to a lower side than the spiral path forming member in the settling section, And a drainage part for discharging treated water from the upper part in the precipitation part to the outside of the precipitation part.
(2) The solid-liquid separation mechanism according to (1), wherein the spiral passage forming member forms a spiral passage that is inclined so as to descend from the outer edge to the inner edge.
(3) In the solid-liquid separation mechanism described in (2), an opening for dropping sediment is provided in the center of the spiral passage forming member.
(4) In the solid-liquid separation mechanism according to (1), the exhaust pipe passes through a central portion of the settling portion, and the spiral passage forming member has an outer edge between the inside of the settling portion and the exhaust pipe. A spiral passage inclined so as to descend from the inner edge to the inner edge is formed, and an opening for dropping the precipitate is provided between the exhaust pipe and the spiral passage forming member.
(5) In the solid-liquid separation mechanism according to any one of (1) to (4), the gas is prevented from flowing into the lower opening of the precipitation part, and the lower opening of the precipitation part An annular baffle plate is provided for allowing the sediment from the passage to pass through the upper side of the gas collecting part.
(6) The organic wastewater treatment apparatus of the present invention includes a treatment tank in which a reaction part comprising an anaerobic sludge layer is formed at the bottom of the tank, and a supply pipe for supplying organic wastewater into the reaction part in an upward flow And a precipitation part that is disposed above the reaction part in the treatment tank, has upper and lower ends that are open, and has an upper end that protrudes above the water surface, and is disposed below the precipitation part, and the precipitation part A gas collecting part that spreads downward to collect the gas that floats toward the lower opening of the gas, and an exhaust that has a lower end connected to the gas collecting part and discharges the gas in the gas collecting part onto the water surface A pipe, a spiral passage forming member that is disposed in the settling portion and forms a spiral passage from below to above, and a process of supplying treated water outside the settling portion to a lower side than the spiral passage forming member in the settling portion The treated water is discharged out of the treatment tank from the water supply part and the upper part in the settling part. Characterized in that it comprises a drainage unit for.
(7) In the organic waste water treatment apparatus according to (6), the spiral passage forming member forms a spiral passage that is inclined so as to descend from the outer edge to the inner edge.
(8) The organic waste water treatment apparatus according to (7), wherein an opening for dropping sediment is provided in a central portion of the spiral passage forming member.
(9) In the organic waste water treatment apparatus according to (6), the exhaust pipe passes through a central portion of the settling portion, and the spiral passage forming member is disposed between the inside of the settling portion and the exhaust pipe. A spiral passage which is inclined so as to descend from the edge to the inner edge is formed, and a sediment dropping opening for dropping the sediment is provided between the exhaust pipe and the spiral passage forming member.
(10) In the organic waste water treatment apparatus according to any one of (6) to (9), the gas is prevented from flowing into the lower opening of the precipitation part, and An annular baffle plate that allows the precipitate from the opening to pass along the upper side of the gas collection unit is arranged.

According to the present invention, by arranging the gas collecting part for collecting the gas that floats toward the lower opening of the precipitation part below the precipitation part, the rising gas is opened at the lower part of the precipitation part. Since the entry into the sedimentation portion is prevented, the sediment from the sedimentation portion is returned to the sedimentation portion with the rising gas and is not rolled up, so that treated water with a high sludge removal rate can be obtained with a simple configuration.
In addition, since the spiral passage is formed in the sedimentation portion from the bottom to the top by the spiral passage forming member, the precipitation surface area can be increased by the long spiral passage, and the treated water can flow uniformly upward in the long spiral passage. And the sediment can be dropped along the spiral passage forming member forming the bottom of the spiral passage.
Since the spiral passage is inclined so as to descend from the outer edge to the inner edge of the spiral passage forming member, the precipitate is dropped along the inner side of the spiral passage forming member forming the bottom of the spiral passage, and the precipitate falls. Can be promoted.
Moreover, since the opening for deposit fall was provided in the center part of the spiral passage formation member, the deposit can be dropped without being suspended again.
Furthermore, since the annular baffle plate that prevents the gas from flowing into the lower opening of the sedimentation portion is arranged, it is possible to further prevent the rising gas from entering the sedimentation portion from the lower opening of the sedimentation portion, Treated water with a higher sludge removal rate can be obtained with a simple configuration.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a longitudinal sectional view of an organic waste water treatment apparatus according to a first embodiment of the present invention, FIG. 2 is a plan sectional view corresponding to the line AA of FIG. 1, and FIG. 3 is a solid-liquid separation shown in FIG. FIG. 4 is a perspective view showing an example of a spiral passage forming member shown in FIG.
In FIG. 3, the annular baffle is not shown.

  In FIG. 1, an organic wastewater treatment apparatus D includes a treatment tank 11 having an anaerobic sludge layer formed at the bottom inside the tank, for example, a treatment tank 11 whose planar shape is circular and sealed, and the inside of the treatment tank 11. One end is connected to the supply pipe 21 connected to the lower side of the processing tank 11 and the ceiling of the processing tank 11 so as to supply the organic waste water into the reaction section 12 in an upward flow. A degassing pipe 22 that discharges the above gas to the atmosphere, and a truncated cone part 36 that is disposed above the reaction part 12 in the processing tank 11 and whose upper end is constricted downward below the cylindrical part 32 protruding above the water surface. A conical gas which is arranged below the continuous precipitation portion 31 and the truncated cone portion 36 and expands more than the size of the opening 36a downward to collect the gas rising toward the opening 36a at the lower end of the truncated cone portion 36. The lower end is connected to the collection unit 41 and the gas collection unit 41, and the precipitation unit 3 Between the outer edge and the inner edge between the exhaust pipe 42 and the exhaust pipe 42 through which the gas in the gas collection part 41 is discharged onto the water surface. A spiral passage forming member 51 that forms a spiral passage 52 that is inclined downward, a sediment drop passage opening 61 formed by a gap between the lower end of the truncated cone portion 36 and the exhaust pipe 42, and a reaction in the treatment tank 11. The treated water that floats through the portion 12 is supplied in a tangential direction below the spiral passage forming member 51 in the cylindrical portion 32 of the settling portion 31. Between the four (plural) treated water supply parts 71, the drain part 81 which discharges treated water from the upper part in the sedimentation part 31 to the outside of the treatment tank 11, the truncated cone part 36 and the gas collecting part 41 Arranged to prevent the gas from flowing into the sediment drop passage opening 61 and settling The precipitate from the object falling passage opening 61 is constituted by an annular baffle plate 91 to pass into Tsutai upper gas collecting portion 41.

The sedimentation part 31 described above includes a cylindrical part 32 whose upper end protrudes above the water surface, and a truncated cone part 36 connected to the lower end of the cylindrical part 32.
The cylindrical portion 32 includes a large-diameter cylindrical portion 33 with an upper end opening 33a protruding above the water surface, a truncated conical connection portion 34 that opens downward at the lower end connected to the lower end of the large-diameter cylindrical portion 33, and A small-diameter cylindrical portion 35 is connected to the lower end of the truncated cone connecting portion 34 and is connected to the lower end of the truncated cone portion 36.

In this embodiment, as shown in FIG. 4, the above-described spiral passage forming member 51 is used by shifting the circumferential direction by 60 degrees in the circumferential direction by 60 degrees and moving upward and downward from the lower and upper sides of the outer periphery of the exhaust tube 42. Six spiral passages 52 are formed.
The inner edge of the spiral passage forming member 51 is provided with a sediment dropping opening 53 for dropping the sediment from the top to the bottom with the exhaust pipe 42.

  As shown in FIG. 3, the above-described treated water supply unit 71 is configured by a U-shaped ridge that opens downward, and the spiral passage forming member 51 is disposed in the small-diameter cylindrical portion 35 below the spiral passage forming member 51. Are attached so as to form the same swirling flow as the spiral passage 52 formed by.

  The above-mentioned discharge part 81 is, for example, a water collecting basin 82 attached around the inner circumference of the large-diameter cylindrical part 33 constituting the precipitation part 31 and the treated water in the water collection basin 82 to the precipitation part. 31 and a drain pipe 83 that discharges to the outside of the treatment tank 11.

  The solid-liquid separation mechanism S is constituted by a sedimentation section 31, a gas collection section 41, an exhaust pipe 42, a sediment drop passage opening 61, a treated water supply section 71, a drainage section 81, and an annular baffle plate 91. .

Next, the treatment of organic waste water will be described.
First, when organic wastewater (raw water) is supplied from the supply pipe 21 into the reaction section 12 in the treatment tank 11 so as to flow in an anaerobic sludge layer constituting the reaction section 12, Wastewater is treated with sludge, and organic substances contained in it are decomposed by anaerobic microorganisms to become treated water.
Then, the treated water is generated by decomposition, and further flows upward from the reaction unit 12 together with some sludge along with the anaerobic gas that rises.

The anaerobic gas that floats toward the sediment dropping passage opening 61 in this way is collected by the gas collecting section 41 and discharged onto the water surface through the exhaust pipe 42, and then is discharged by the gas vent pipe 22. Released into the atmosphere.
And a part of anaerobic gas which was not collected by the gas collection part 41 is blocked | prevented as it goes to the surface of a water as it is, or it goes to the deposit fall passage opening 61 by the annular baffle plate 91. After ascending to the surface of the water, it is released to the atmosphere through the degassing pipe 22.
Further, a part of the anaerobic gas that has not been collected by the gas collection unit 41 is supplied into the precipitation unit 31 through the treated water supply unit 71 together with the treated water containing sludge.

The sludge that has entered the sedimentation part 31 in this way flows into the sedimentation part 31 (small-diameter cylindrical part 35) in a tangential direction, and thus swirls on the swirling vortex generated in the sedimentation part 31. At the same time, the spiral passage 52 ascends, gathers at the center of the sedimentation portion 31 by the centripetal force of the vortex, passes through the sediment fall passage opening 61 from the sediment fall opening 53 by its sedimentation property, It settles freely on the upper side and settles on the reaction part 12.
Thus, when sludge settles, the anaerobic gas which floats toward the gas collection part 41 is collected by the gas collection part 41, and is not collected by the gas collection part 41, but for sediment fall passages. Since the anaerobic gas toward the opening 61 is blocked by the annular baffle plate 91 toward the sediment drop passage opening 61, the sludge from the sediment drop passage opening 61 is floated by the anaerobic gas inside the precipitation portion 31. It is surely settled without being rolled up.

In addition, the anaerobic gas that has entered the precipitation unit 31 via the treated water supply unit 71 rises on the swirling vortex, floats on the water surface, and is then released to the atmosphere through the gas vent pipe 22.
Further, the treated water that has entered the sedimentation section 31 via the treated water supply section 71 rides on the swirling vortex, ascends the spiral passage 52, flows into the water collecting tank 82, and passes through the drain pipe 83 to the sedimentation section. It is discharged out of 31 and out of the treatment tank 11 and reused or discharged.
Therefore, the treated water discharged from the drain pipe 83 has a small sludge content.

As described above, according to the first embodiment of the present invention, the sediment drop passage opening 61 is provided on the lower side (lower end) of the truncated cone part 36 (sedimentation part 31), and below the truncated cone part 36, By disposing the gas collecting part 41 that collects the gas that rises toward the sediment drop passage opening 61, the rising gas is prevented from entering the sediment part 31 from the sediment drop passage opening 61. As a result, the sediment from the sedimentation section 31 is returned to the sedimentation section 31 with the gas that floats and is not rolled up, so that treated water having a high sludge removal rate can be obtained with a simple configuration.
Further, since the spiral passage 52 is formed in the sedimentation portion 31 from the lower side to the upper side by the spiral passage forming member 51, the precipitation surface area can be increased by the long spiral passage 52, and the treated water is uniformly distributed in the long spiral passage 52. In addition, the precipitate can be dropped along the spiral passage forming member 51 that forms the bottom of the spiral passage 52.
And since the spiral passage 52 is inclined so as to descend from the outer edge of the spiral passage forming member 51 to the inner edge, the precipitate is dropped along the inner side of the spiral passage forming member 51 that forms the bottom of the spiral passage 52, It is possible to promote the fall of the deposit.
Moreover, since the sediment drop opening 53 is provided at the center of the spiral passage forming member 51, the sediment can be dropped without being suspended again.
Furthermore, since the annular baffle plate 91 is disposed between the truncated cone part 36 and the gas collection part 41, it is possible to further prevent the rising gas from entering the precipitation part 31 from the precipitate drop passage opening 61. Further, treated water with a higher sludge removal rate can be obtained with a simple configuration.
And since the treated-water supply part 71 was made into the U-shaped bottle open | released below, the treated water which floats can be reliably supplied in the precipitation part 31. FIG.

In the said Example, although the example which applied the solid-liquid separation mechanism S to the organic waste water treatment apparatus of an upflow sludge blanket type was shown, the solid-liquid separation mechanism S is an organic waste water treatment apparatus of an expanded granular sludge bed type. Can also be applied.
And although the planar shape of the processing tank 11 was made into circular and the upper part which protrudes on the water surface of the precipitation part 31 was shown as the large diameter cylindrical part 33, these planar shapes are square, hexagonal, etc., for example Other shapes may be used.
Moreover, although the cylindrical part 32 showed the example which connected the several cylindrical part, ie, the example which connected the large diameter cylindrical part 33 and the small diameter cylindrical part 35 with the truncated cone connection part 34, a cylindrical part is single. In addition, although the example in which the sedimentation portion 31 is configured by the cylindrical portion 32 and the truncated cone portion 36 is shown, the sedimentation portion 31 has an opening 32a at the upper and lower ends as shown in FIG. 32b, for example, a simple cylindrical portion 32A having an arbitrary shape such as a circular shape, a square shape, or another polygonal shape may be used.
Furthermore, although the exhaust pipe 42 is shown as an example in which the central portion of the precipitation portion 31 is penetrated, the exhaust pipe 42 is open on the water surface through the outside of the precipitation portion 31 as shown in FIG. Also good.
An example of the spiral passage forming member 51 that forms the spiral passage 52 that inclines so as to descend from the outer edge to the inner edge is shown. However, as shown in FIG. The spiral passage 52 which inclines so that it may descend | fall to a periphery may be formed, In this case, you may provide the opening 53 for sediment fall between the inner side of the sedimentation part 31, and the spiral passage formation member 51. .
Moreover, although the example which attached the treated water supply part 71 to the sedimentation part 31 so that a swirl | vortex flow might be formed in the sedimentation part 31 was shown, the helical channel | path formation member 51 for forming a swirl | vortex flow in the sedimentation part 31 was shown. Therefore, the treated water supply unit 71 may be attached in any way as long as the treated water can be supplied into the sedimentation unit 31.
Furthermore, the treated water supply unit 71 is a U-shaped bowl opened downward, and four treated water supply units 71 are provided. However, if the floating treated water can be supplied into the precipitation unit 31, Other shapes may be used, and one or more treated water supply units 71 may be provided according to the treatment capacity.
And although the example which comprised the drainage part 81 by the water collecting tank 82 and the drain pipe 83 was shown, if the treated water can be discharged similarly, another structure may be sufficient.

It is a longitudinal cross-sectional view of the organic waste water treatment equipment which is 1st Example of this invention. It is a plane sectional view equivalent to the AA line of FIG. It is a perspective view of the solid-liquid separation mechanism shown in FIG. It is a perspective view which shows an example of the spiral channel | path formation member shown in FIG. It is a longitudinal cross-sectional view of the solid-liquid separation mechanism used for the organic waste water treatment equipment which is 2nd Example of this invention. It is a longitudinal cross-sectional view of the solid-liquid separation mechanism used for the organic waste water treatment equipment which is 3rd Example of this invention. It is a perspective view of the helical channel | path formation member used for the organic waste water treatment equipment which is 4th Example of this invention.

Explanation of symbols

D Organic waste water treatment equipment 11 Treatment tank 12 Reaction part 21 Supply pipe 22 Degassing pipe S Solid-liquid separation mechanism 31 Precipitation part (solid-liquid separation mechanism S)
32 cylindrical portion 32A cylindrical portion 32a opening 32b opening 33 large diameter cylindrical portion 33a opening 34 truncated cone connecting portion 35 small diameter cylindrical portion 36 truncated cone portion 36a opening 41 gas collecting portion (solid-liquid separation mechanism S)
42 Exhaust pipe (Solid-liquid separation mechanism S)
51 Spiral passage forming member (solid-liquid separation mechanism S)
52 Spiral passage 53 Opening for sediment dropping 61 Opening for sediment falling passage (Solid-liquid separation mechanism S)
71 Treated water supply unit (solid-liquid separation mechanism S)
81 Drainage part (Solid-liquid separation mechanism S)
82 Catchment 83 83 Drain pipe 91 Annular baffle plate (Solid-liquid separation mechanism S)

Claims (10)

A sedimentation portion having a cylindrical portion with upper and lower ends open and an upper end protruding above the water surface;
A gas collecting part that is arranged below the settling part and spreads downward to collect the gas that floats toward the lower opening of the settling part;
An exhaust pipe having a lower end connected to the gas collection unit and discharging the gas in the gas collection unit onto the water surface;
A spiral passage forming member disposed in the settling portion and forming a spiral passage from below to above;
A treated water supply unit for supplying treated water outside the settling part to a lower side than the spiral passage forming member in the settling part;
A drainage part for discharging treated water from the upper part in the precipitation part to the outside of the precipitation part;
A solid-liquid separation mechanism comprising: In the solid-liquid separation mechanism according to claim 1,
The spiral passage forming member forms a spiral passage that is inclined so as to descend from the outer edge to the inner edge;
A solid-liquid separation mechanism characterized by that. The solid-liquid separation mechanism according to claim 2,
An opening for dropping precipitates is provided at the center of the spiral passage forming member.
A solid-liquid separation mechanism characterized by that. In the solid-liquid separation mechanism according to claim 1,
The exhaust pipe passes through the center of the sedimentation part,
The spiral passage forming member forms a spiral passage that is inclined so as to descend from the outer edge to the inner edge between the inside of the precipitation portion and the exhaust pipe,
A sediment dropping opening for dropping the sediment was provided between the exhaust pipe and the spiral passage forming member.
A solid-liquid separation mechanism characterized by that. In the solid-liquid separation mechanism according to any one of claims 1 to 4,
Arranged an annular baffle that prevents gas from flowing into the lower opening of the sedimentation section and allows the sediment from the lower opening of the sedimentation section to pass through the upper side of the gas collection section,
A solid-liquid separation mechanism characterized by that. A treatment tank in which a reaction part consisting of an anaerobic sludge layer is formed at the bottom of the tank;
A supply pipe for supplying organic wastewater into the reaction section in an upward flow;
A precipitation part that is disposed above the reaction part in the treatment tank and has a cylindrical part that is open at the upper and lower ends and protrudes above the water surface;
A gas collecting part that is arranged below the settling part and spreads downward to collect the gas that floats toward the lower opening of the settling part;
An exhaust pipe having a lower end connected to the gas collection unit and discharging the gas in the gas collection unit onto the water surface;
A spiral passage forming member disposed in the settling portion and forming a spiral passage from below to above;
A treated water supply unit for supplying treated water outside the settling part to a lower side than the spiral passage forming member in the settling part;
A drainage part for discharging treated water from the upper part in the precipitation part to the outside of the treatment tank;
An organic wastewater treatment apparatus comprising: In the organic waste water treatment equipment according to claim 6,
The spiral passage forming member forms a spiral passage that is inclined so as to descend from the outer edge to the inner edge;
Organic wastewater treatment equipment characterized by that. In the organic waste water treatment equipment according to claim 7,
An opening for dropping precipitates is provided at the center of the spiral passage forming member.
Organic wastewater treatment equipment characterized by that. In the organic waste water treatment equipment according to claim 6,
The exhaust pipe passes through the center of the sedimentation part,
The spiral passage forming member forms a spiral passage that is inclined so as to descend from the outer edge to the inner edge between the inside of the precipitation portion and the exhaust pipe,
A sediment dropping opening for dropping the sediment was provided between the exhaust pipe and the spiral passage forming member.
Organic wastewater treatment equipment characterized by that. In the organic waste water treatment equipment according to any one of claims 6 to 9,
Arranged an annular baffle that prevents gas from flowing into the lower opening of the sedimentation section and allows the sediment from the lower opening of the sedimentation section to pass through the upper side of the gas collection section,
Organic wastewater treatment equipment characterized by that.

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