JP2007278003A - Method and apparatus for purification treatment of sewage pressure feed line system - Google Patents

Abstract

The present invention provides a purification method and apparatus for a sewage pressure feed line system capable of supplying sufficient oxygen necessary for maintaining microbial activity to a sewage pipe line.
In a sewage pumping line system in which sewage is pumped by a pump, oxygen is introduced as an injected gas in the sewage that stays in the sewage pipe connected to the pump or in the manhole in which the pump is installed. Alternatively, a gas containing ozone is injected, and the injected gas has a peak in the range of 0.1 μm to 200 μm in the bubble diameter distribution.
[Selection] Figure 1

Description

  The present invention relates to a purification method and apparatus for a sewage pressure line system, and relates to a technique for preventing generation of malodor in a sewage line.

  Conventionally, as shown in FIG. 10, for example, as shown in FIG. 10, the pressure-feed sewage pipe is provided with a manhole 2 in the middle of the sewage pipe 1, a pump 3 is installed in the manhole 2, and the upstream sewage pipe 1 is connected to the manhole 2. The sewage that has flowed in is sent out to the sewage pipe 1 on the downstream side by the pump 3.

  In such a pressure-feed type sewage pipe 1, the pump 3 is not always operated. When the water level of the manhole 2 reaches a predetermined operation start water level, the pump 3 is activated to supply water, and the water level of the manhole 2 is The pump 3 stops when the predetermined stop water level is reached.

  By the way, the sewage pipe line 1 is in an anaerobic environment, and if sewage stays in the middle of the sewage pipe line 1, hydrogen sulfide or the like causing a bad odor is generated due to decay, and the manhole 2 on the downstream side at the time of the next water supply is generated. Substances causing bad odor are pushed out.

In order to prevent this bad odor, air is blown into the sewage pipe 1 by a compressor 4 as shown in FIG.
In Patent Document 1, a manhole pump station includes a return pipe branched from a pressure feed pipe, an on-off valve that opens and closes the return pipe, a self-priming aeration mixer, and a submersible pump connected to the pressure feed pipe. Yes.

  In this configuration, when the operation stop state of the submersible pump continues for a predetermined time, the return pipe open / close valve is opened, the sewage in the pressure feed pipe is returned to the pump well of the manhole pump station, the aeration mixer is activated, and the return is returned. Supply oxygen to the sewage and aerate the sewage. Next, the operation of the aeration mixer is stopped, and after a predetermined time has elapsed, the submersible pump is activated and the sewage is pumped again to the pumping pipe.

  Moreover, in patent document 2, in the sewage pressure feed line provided with the sewage pressure feed pump and the air injection compressor, the air injection compressor and the sewage pressure feed pump are operated in parallel, and after the sewage pressure feed pump is stopped, The air injection compressor is driven alone only when the sewage pump is not driven after a certain period of time.

Moreover, in patent document 3, the air pipe which provided the air blowing hole in the bottom part in a sewage pressure feeding pipe at intervals of the longitudinal direction is arrange | positioned, and air is discharged from the air blowing hole into the sewage even when the pump for pumping is stopped. By blowing out in the form of bubbles, the sewage is agitated and aerated to maintain the aerobic state, the generation of hydrogen sulfide is suppressed, and the purification function is improved.
JP 2005-248516 A Japanese Patent Laid-Open No. 11-172756 JP-A-7-150612

  However, in the above configuration, since air is blown directly into the sewage pipe 1 by the compressor 4, the bubble diameter of the air is in the range of several millimeters to several centimeters, and the bubble diameter is large. (Dissolution efficiency) is low, and as a result, the dissolved oxygen concentration of sewage is low.

  For this reason, in order to sufficiently supply the required amount of oxygen to the aerobic microorganisms in the sewage pipe, it is necessary to supply a large amount of air, which consumes a large amount of energy and increases the operating cost. In addition, undissolved air forms a puddle in the pipe and inhibits water supply during pump operation, resulting in unstable pump operation and increased pump power consumption or damage to the pump. .

  This invention solves said subject, and provides the purification processing method and apparatus of a sewage pressure feed line system which can supply sufficient oxygen required for maintenance of microbial activity to a sewage pipe line. Objective.

  In order to solve the above-mentioned problems, a purification method for a sewage pressure pipeline system according to the present invention is a sewage pressure pipeline system in which sewage is pumped by a pump. A gas containing oxygen or ozone is injected into the sewage retained therein, and the gas has a peak in the range of 0.1 μm to 200 μm in the bubble diameter distribution.

  The purification apparatus for the sewage pressure feed line system of the present invention is a sewage pressure feed line system in which a pump is installed in a manhole, and sewage flowing into the manhole from the upstream sewage pipe line is sent to the downstream sewage pipe line by the pump. Further, the present invention is characterized in that a fine bubble generating device for mixing fine bubbles in the sewage flowing through the sewage pipe is provided.

Moreover, the bubble diameter of a fine bubble is 0.1 micrometer-200 micrometers, It is characterized by the above-mentioned.
In addition, the fine bubble generating device includes a gas supply portion having an outer peripheral surface in a cylindrical shape inside a casing having an inner peripheral surface in a cylindrical shape, and a gap between the inner peripheral surface of the casing and the outer peripheral surface of the gas supply portion. It forms an air-mixing flow path through which sewage flows, and the air-mixing flow path communicates at one end with an upstream pipe of the sewer pipe and at the other end with a downstream pipe of the sewage pipe, and contains oxygen or ozone. The gas supply part connected to the gas supply source of gas consists of the porous body which has a micropore, or a porous body, It is characterized by the above-mentioned.

Further, the sewage is swirled in the air-mixing flow path.
The gas supply part has a cylindrical outer peripheral surface, and the casing has a liquid supply port that has an inner peripheral surface cylindrical and communicates with the upstream pipe line of the sewage pipe. It is characterized by being connected in a tangential direction.

  In addition, the fine bubble generating device includes a gas supply unit having an inner peripheral surface in a cylindrical shape inside a casing communicating with a gas supply source of gas containing oxygen or ozone, and a mixture in which sewage flows inside the gas supply unit. An air flow channel is formed, the mixed gas flow channel communicates at one end with the upstream pipeline of the sewage pipeline, and communicates with the downstream pipeline of the sewage pipeline at the other end. It consists of a body or a porous body.

Moreover, the liquid is swirled in the air-mixing flow path.
In addition, the gas supply unit has an inner peripheral surface of a cylindrical shape, the air-mixing channel communicates with the liquid supply unit at one end, the liquid supply unit communicates with a liquid supply port that communicates with an upstream pipeline of the sewage pipeline, And a liquid channel that communicates with the air-mixing channel with a cylindrical surface, and the liquid supply port is connected to the liquid channel in a tangential direction.

  As described above, according to the present invention, the gas containing oxygen or ozone injected into the sewage pipe or the sewage staying in the manhole has a peak in the range of 0.1 μm to 200 μm in the bubble diameter distribution. By having it, the dissolution rate of the injected gas is increased, and sufficient dissolved oxygen concentration in sewage necessary for maintaining microbial activity can be achieved with a smaller amount of gas than before, malodor can be reduced in a short time, and consumption The energy to do becomes small, and the operation cost can be suppressed.

  In addition, the small bubble diameter makes it difficult for the bubbles to coalesce, to be easily entrained in the water flow, and to be difficult to float. Therefore, the operation of the pump does not become unstable, the power consumption of the pump does not increase, and the pump is not damaged.

  In addition, by mixing the gas containing oxygen or ozone as fine bubbles in the limited space of the sewage pipeline as fine bubbles, the dissolution rate of the injected gas with respect to the sewage flowing through the sewage pipeline is increased. As a result, sufficient oxygen necessary for maintaining microbial activity can be supplied to the sewage in the sewage pipe.

  The microbubble generator generates microbubbles by swirling sewage swirling along the surface of the gas supply section with a gas containing oxygen or ozone ejected in the form of small semi-bubbles on the surface of the gas supply section. The swirl flow of the sewage is entrained through the generated fine bubbles. For this reason, a gas containing oxygen or ozone in a sufficient amount necessary for microbial activity can be easily mixed into the sewage as fine bubbles.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the sewage pressure transmission line system has a pump 12 installed in a manhole 11, and sewage flowing into the manhole 11 from the upstream sewage pipe 13 is sent to the downstream sewage pipe 13 by the pump 12. It is provided with a fine bubble generating device 14 that forms a purification treatment device. In the present embodiment, the fine bubble generator 14 injects a gas containing oxygen or ozone as an injection gas in the middle of the sewage pipe 13, and the injection gas includes oxygen gas, air, ozone gas, ozonization. Any material containing oxygen such as air or ozone may be used. Further, as the fine bubble generating device 14, a self-priming type device that is installed inside the manhole 11 and sucks air in the atmosphere can be used.

  As shown in FIG. 2, the fine bubble generating device 14 includes a gas supply unit 22 having an outer peripheral surface in a cylindrical shape inside a casing 21 having an inner peripheral surface in a cylindrical shape, and an inner peripheral surface of the casing 21. An air-mixing flow path 23 in which sewage flows is formed between the outer peripheral surfaces of the gas supply unit 22.

  The air-mixing channel 23 communicates at one end with the upstream pipeline of the sewage pipeline 13, communicates with the downstream pipeline of the sewage pipeline 13 at the other end, and connects the compressor 24 to the gas supply unit 22. The compressor 24 communicates with the supply source of the injected gas (for example, the atmosphere, ozone generator) on the suction side, and the gas supply unit 22 is made of a porous body or a porous body having micropores. In the present embodiment, the gas supply part 22 is made of a ceramic porous wall, and the bubble diameter of the fine bubbles ejected from the fine holes is 0.1 μm to 200 μm or less.

  With the above configuration, the injection gas is supplied by the compressor 24 and supplied to the air-mixing flow path 23 through the gas supply unit 22. The sewage flowing along the outer peripheral surface of the gas supply unit 22 entrains the fine bubbles ejected into the air-mixing flow path 23, thereby allowing the fine gas bubbles to flow inside the sewage pipe 13 connected to the pump 12 (in the case of the self-priming type, the pump 12 The injection gas is injected into the sewage that stays in the manhole 11 in which is installed.

  The injection gas has a peak in the range of 0.1 μm to 200 μm in the bubble size distribution, so that the dissolution rate of the injection gas is increased, and sufficient sewage dissolved in the microbial activity is maintained. Oxygen concentration can be achieved with a smaller amount of gas than before, malodor can be reduced in a short time, energy consumed by the compressor 24 is reduced, and operating costs can be suppressed.

  Here, in Table 1 and FIG. 9, the time Tx until the injected gas is saturated at each average bubble diameter of the injected gas and the dissolved oxygen concentration at that time will be described.

表１および図９に示すように、平均気泡径が小さくなるほどに注入気体が飽和するまでの時間が短くなり、飽和時における溶存酸素濃度が高くなる。平均気泡径が０．１μｍより小さくすると圧力損失が大きくなって非現実的なものとなり、平均気泡径が１０ｍｍより大きくなると微生物活性の維持に必要とする十分な下水中の溶存酸素濃度の達成が困難となる。

As shown in Table 1 and FIG. 9, the time until the injected gas is saturated becomes shorter as the average bubble diameter becomes smaller, and the dissolved oxygen concentration at the time of saturation becomes higher. If the average bubble diameter is less than 0.1 μm, the pressure loss increases and becomes unrealistic. If the average bubble diameter is greater than 10 mm, sufficient dissolved oxygen concentration in sewage necessary for maintaining microbial activity is achieved. It becomes difficult.

  In addition, since the bubble diameter is small, it is difficult for the bubbles to coalesce, to be easily entrained in the water flow, and to be difficult to rise. Therefore, the movement distance of the bubbles in the pipe line of the sewage pipe 13 becomes long, and the air bubbles are Since accumulation does not easily occur and does not hinder water supply by the pump 12, the operation of the pump 12 does not become unstable, the power consumption of the pump 12 does not increase, and the pump 12 is not damaged.

  Further, by mixing the injected gas as fine bubbles in the limited space of the sewage pipeline 13 as a fine bubble, the dissolution rate of the injected gas into the sewage flowing through the sewage pipeline 13 is increased, and as a result. Sufficient oxygen required for maintaining microbial activity can be supplied to the sewage of the sewage pipe 13.

  Moreover, the fine bubble generator 14 can also be configured as shown in FIG. As shown in FIG. 3, in the fine bubble generating device 14, an air supply channel 23 in which a gas supply unit 22 having an inner peripheral surface formed in a cylindrical shape is disposed inside a casing 21, and sewage flows into the gas supply unit 22. The air-mixing flow path 23 communicates at one end with the upstream pipeline of the sewage pipeline 13, and communicates with the downstream pipeline of the sewage pipeline 13 at the other end, and connects the compressor 24 to the casing 21. ing.

  With the above configuration, the injection gas is supplied by the compressor 24 and supplied to the air-mixing flow path 23 through the gas supply unit 22. Sewage flowing along the inner peripheral surface of the gas supply unit 22 entrains the fine bubbles ejected into the air-mixing channel 23.

  Moreover, the fine bubble generator 14 can also be configured as shown in FIGS. Here, the casing 51 of the fine bubble generating device 14 includes an outer cylinder part 52 having an inner peripheral surface of a cylindrical shape, flange parts 53 and 54 disposed at both ends of the outer cylinder part 52, and one flange part 53 in a watertight manner. And an end plate 55 attached by a fastening member (not shown) such as a bolt.

  A gas supply part 56 forming an inner cylinder is disposed concentrically inside the outer cylinder part 52 of the casing 51, and the gas supply part 56 has a cylindrical outer peripheral surface and is a porous body or a porous body having micropores. In the present embodiment, the gas supply unit 56 is made of a ceramic porous wall.

  Between the inner peripheral surface of the outer cylinder part 52 of the casing 51 and the outer peripheral surface of the gas supply part 56, an air-mixing flow path 57 through which sewage flows in a swirling flow is formed. The other end is watertightly closed with a rubber skirt 58. The rubber skirt 58 is externally fitted to the end of the gas supply unit 56 and is held by one flange portion 53, and between the gas supply unit 56 and the end plate 55 and between the gas supply unit 56 and the outer cylinder unit 52. It is intervening.

  The end plate 55 and the rubber skirt 58 are formed with through holes 55 a and 58 a communicating with the internal flow path of the gas supply unit 56, and a threaded pipe joint 59 is connected to the through hole 55 a of the end plate 55. The threaded pipe joint 59 includes a nipple 59 a that is screwed into the through hole 55 a of the end plate 55 and a socket 59 b that is connected to the compressor 24.

  A plug 60 is watertightly fixed to one end of the gas supply unit 56, and one end of a rod 61 inserted into the gas supply unit 56 is connected to the plug 60. The other end of the rod 61 protrudes from the nipple 59 a into the socket 59 b, and the plug 60 is prevented from being removed via the rod 61 by tightening a wing nut 62 that is screwed to the other end.

  A jet part 63 is fixed to the other flange part 54 of the casing 51 by a fastening member (not shown) such as a bolt. The jet part 63 is connected to the flange part 54 of the casing 51 in a watertight manner and a reducer 65. The reducer 65 has a reduced diameter portion 65 a in the middle, and a tip opening 65 b that increases in diameter communicates with the downstream side pipeline of the sewage pipeline 13.

  The casing 51 has a liquid supply port 66 that communicates with the upstream side pipeline of the sewage pipeline 13, and the liquid supply port 66 is tangentially connected to the air-mixing channel 57. The liquid supply port 66 has a connecting portion 66a for connecting the sewage pipe 13 and a connection port 66b connected to the air-mixing flow channel 57, and a water injection angle adjusting portion 67 is arranged in the connection port 66b.

  The water injection angle adjustment unit 67 includes two comb-shaped guide members 67a inserted into the connection port 66b of the liquid supply port 66, and a flange portion 67b that holds the guide member 67a. The flange portion 67b is connected to the connection portion 66a and the connection portion 66a. It is interposed between the flange portions 66c and 66d of the opening 66b, and is fixed by a fastening member (not shown) such as a bolt.

A plurality of water injection angle adjusting portions 67 having different inclination angles of the guide member 67a are prepared, and the swirling pitch of the swirling flow can be set and changed by replacing them.
In the above configuration, the sewage supplied by the pump 12 is supplied to the air-mixing channel 57 through the liquid supply port 66. The sewage flowing from the water injection angle adjusting unit 67 into the mixed gas flow path 57 is guided by the guide member 67a and flows into the mixed gas flow path 57 so as to be inclined with respect to the axis of the gas supply unit 56 and the mixed gas flow path 57. It flows in the mixed air flow path 57 in a swirling flow.

  Here, when the water injection angle adjustment unit 67 having a different inclination angle of the guide member 67 a is used, the swirl pitch of the swirl flow changes, and the swirl flow flows along the outer peripheral surface of the gas supply unit 56 while flowing through the mixed gas flow path 57. The distance changes.

  When the guide member 67a is guided to flow into the air-mixing flow path 57, the angle at which the inflowing water is inclined with respect to the axis of the gas supply section 56 and the air-mixing flow path 57 is close to 90 °. The distance that flows along the outer peripheral surface of the gas supply portion increases, and the turning angular velocity on the outer peripheral surface of the gas supply unit 56 increases.

  When the guide member 67a is guided to flow into the air-mixing flow path 57, the angle at which the inflowing water is inclined with respect to the axis of the gas supply section 56 and the air-mixing flow path 57 is close to 0 °. The distance flowing along the outer peripheral surface of the gas supply portion 56 becomes shorter, and the turning angular velocity on the outer peripheral surface of the gas supply unit 56 becomes slower.

  On the other hand, the injected gas pressurized from the compressor 24 is supplied to the gas supply unit 56 through the screw fitting 59. In a state where the sewage flows in the mixed flow path 57 in a swirling flow, the injected gas is jetted from the outer peripheral surface to the mixed flow path 57 through the porous body having the micropores of the gas supply unit 56 or the wall body made of the porous body.

  At this time, the swirl flow flows along the outer peripheral surface of the gas supply unit 56, and the swirl flow flows along the outer peripheral surface of the gas supply unit 56 with the gas ejected in the form of minute semi-bubbles on the outer peripheral surface of the gas supply unit 56. The fine bubbles are generated by shearing, and the fine bubbles are continuously generated by the swirling flow entrained from the outer peripheral surface of the gas supply unit 56.

  At this time, as the swirling angular velocity of the swirling flow on the outer peripheral surface of the gas supply unit 56 increases, the particle size of the fine bubbles decreases, and as the distance that the swirling flow flows along the outer peripheral surface of the gas supply unit 56 increases. The amount of bubbles to be increased.

  Accordingly, by adjusting the flow rate of the supplied sewage and the amount of injected gas to be supplied, an arbitrary amount of injected gas can be mixed into the sewage as fine bubbles. In the present embodiment, since the sewage is supplied to the mixed air flow path 57 by the pump 12, a sufficient swirling flow velocity can be ensured.

  The swirling flow of the gas-liquid mixed phase accompanied by the fine bubbles flows out from the opening of one end of the mixed gas flow path 57 to the outside of the casing 51 and flows into the ejection part 63. The swirling flow of the gas-liquid mixed phase that has flowed into the jet part 63 passes through the reduced diameter part 65a, moves while the swirling radius is increased in the reducer 65, and flows into the downstream pipe line of the sewer pipe 13 from the tip opening 65b.

  Moreover, the microbubble generator 14 can also be configured as shown in FIG. Here, the casing 71 of the fine bubble generating device 14 is watertightly joined to one end 73 of the outer sleeve 72 having the gas supply port 72a and the end portions 73, 74 on both sides of the outer sleeve 72, and bolts or the like. The end plate 75 is attached by the fastening member 71a.

  A gas supply unit 76 is disposed inside the outer casing 72 of the casing 71. The gas supply unit 76 has a cylindrical inner peripheral surface and forms an air-mixing channel 77 through which sewage flows in a swirling flow. The gas supply unit 76 is made of a porous body or a porous body having micropores, and in the present embodiment, is made of a ceramic porous wall.

  The air-mixing flow path 77 is opened at one end of the casing 71 in the axial direction, and the other end is sealed watertight by a rubber ring 78. The rubber ring 78 is interposed between the end of the gas supply unit 76 and the end plate 75.

The end plate 75 is formed with a through hole 75 a communicating with the air-mixing flow path 77 of the gas supply unit 76, and the liquid supply unit 79 is connected to the through hole 75 a of the end plate 75.
The liquid supply unit 79 includes a liquid supply port 80 that communicates with the upstream line of the communication tube 29 of the water communication device 24, and a liquid channel 81 that has an inner peripheral surface that is cylindrical and communicates with the air-mixing channel 77. is doing.

  The liquid supply port 80 has a connecting portion 80a for connecting to the upstream side pipeline of the sewage pipeline 13, and a connection port 80b for connecting to the liquid channel 81 in a tangential direction. An adjustment unit 82 is arranged.

  The water injection angle adjustment unit 82 includes two comb-shaped guide members 82a inserted into the connection port 80b of the liquid supply port 80 and a flange unit 82b that holds the guide member 82a. The flange unit 82b is connected to the connection unit 80a and the connection unit 80a. It is interposed between the mouths 80b and fixed with fastening members (not shown) such as bolts. A plurality of water injection angle adjusting units 82 having different inclination angles of the guide member 82a are prepared, and the swirling pitch of the swirling flow can be set and changed by replacing them.

  An ejection portion 83 is fixed to the other end portion 74 of the casing 71 by a fastening member 71b such as a bolt. The ejection portion 83 includes a flange portion 84 and a reducer 85 which are joined to the end portion 74 of the casing 71 in a watertight manner. The reducer 85 increases in diameter from the small diameter portion 85 a toward the tip opening 85 b, and the tip opening 85 b communicates with the downstream pipe line of the sewer pipe 13.

  In the above configuration, sewage is supplied to the liquid flow path 81 through the liquid supply port 80 of the liquid supply unit 79 by the pump 12. The sewage flowing into the liquid channel 81 from the water injection angle adjusting unit 82 is guided by the guide member 82 a and flows into the liquid channel 81 so as to be inclined with respect to the axis of the liquid channel 81. It flows in the mixed air flow path 77 in a swirling flow.

  Here, when the water injection angle adjustment unit 82 having a different inclination angle of the guide member 82 a is used, the swirl pitch of the swirl flow changes, and the swirl flow flows along the inner circumferential surface of the gas supply unit 76 while flowing through the mixed gas flow path 77. The flowing distance changes.

  When flowing into the liquid flow path 81 by being guided by the guide member 82a, the angle at which the inflowing water is inclined with respect to the axial center of the liquid flow path 81 is closer to 90 ° on the inner peripheral surface of the gas supply unit 76. The distance which flows along becomes long, and the turning angular velocity in the internal peripheral surface of the gas supply part 76 becomes quick.

  When flowing into the liquid channel 81 by being guided by the guide member 82a, the angle at which the inflowing water is inclined with respect to the axis of the liquid channel 81 is closer to 0 °, so that The distance which flows along becomes short, and the turning angular velocity in the outer peripheral surface of the gas supply part 76 becomes slow.

  On the other hand, the injection gas pressurized from the blower 23 is supplied to the gas supply part 76 through the gas supply port 72a. In a state where the sewage flows in the mixed flow path 77 in a swirling flow, the injected gas is jetted from the inner peripheral surface to the mixed flow path 77 through the porous body having the micropores of the gas supply section 76 or the wall body made of the porous body.

  At this time, the swirling flow flows along the inner peripheral surface of the gas supply unit 76, and the swirling flow is the inner peripheral surface of the gas supply unit 76, which is ejected in a minute semi-bubble shape on the inner peripheral surface of the gas supply unit 76. The microbubbles are generated by shearing along the line, and the microbubbles are continuously generated by the swirling flow entrained from the inner peripheral surface of the gas supply unit 76.

  At this time, the higher the swirling angular velocity of the swirling flow on the inner peripheral surface of the gas supply unit 76, the smaller the particle size of the fine bubbles, and the longer the distance the swirling flow flows along the inner peripheral surface of the gas supplying unit 76. The amount of bubbles entrained in increases.

  Accordingly, by adjusting the flow rate of the supplied sewage and the amount of injected gas to be supplied, an arbitrary amount of injected gas can be mixed into the sewage as fine bubbles. In this embodiment, since the sewage is supplied to the mixed air flow path 77 by the pump 12, a sufficient swirling flow velocity can be secured.

  The swirling flow of the gas-liquid mixed phase accompanied by fine bubbles flows out of the casing 71 through the opening at one end of the mixed gas flow channel 77 and flows into the ejection part 83. The swirling flow of the gas-liquid mixed phase that has flowed into the ejection portion 83 passes through the small-diameter portion 85a, moves while the swirling radius is increased in the reducer 85, and flows out from the tip opening 85b to the downstream side conduit of the sewer pipe 13.

The schematic diagram which shows the purification processing apparatus in embodiment of this invention Sectional drawing which shows the fine bubble generator of the purification processing apparatus Sectional drawing which shows the microbubble generator in other embodiment of this invention The partially broken sectional view which shows the fine bubble generator in other embodiment of this invention Sectional drawing which shows the ejection part of the bubble generator Sectional drawing which shows the principal part of the bubble generator Sectional drawing which shows the principal part of the bubble generator The partially broken sectional view which shows the fine bubble generator in other embodiment of this invention Graph showing the relationship between the time required for saturation of the injected gas and the dissolved oxygen concentration at each average bubble size Schematic diagram showing a conventional purification device

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Manhole 12 Pump 13 Sewage pipe 14 Fine bubble generator 21 Casing 22 Gas supply part 23 Mixed air flow path 24 Compressor 51 Casing 52 Outer cylinder part 53, 54 Flange part 55 End plate 55a Through-hole,
56 Gas supply part 57 Mixed air flow path 58 Rubber skirt 58a Through hole 59 Screwed fitting 59a Nipple 59b Socket 60 Plug body 61 Rod 62 Wing nut 63 Jetting part 64 Flange part 65 Reducer 65a Reduced diameter part 65b End opening 66 Liquid supply port 66a Connecting part 66b Connection port 66c, 66d Flange part 67 Water injection angle adjustment part 67a Guide member 67b Flange part 71 Casing 72 Outer sleeve 72a Gas supply port 73, 74 End part 75 End plate 75a Through hole 76 Gas supply part 77 Mixed air flow path 78 Rubber Ring 79 Liquid supply part 80 Liquid supply port 81 Liquid flow path 80a Connection part 80b Connection port 82 Water injection angle adjustment part 82a Guide member 82b Flange part 83 Ejection part 84 Flange part 85 Reducer 85a Reduced diameter part 85b End opening

Claims (9)

In a sewage pumping pipeline system for pumping sewage by a pump, a gas containing oxygen or ozone is injected into a sewage pipeline connected to the pump or sewage staying in a manhole where the pump is installed, A purification method for a sewage pressure-feed line system, characterized in that the gas has a peak in the range of 0.1 μm to 200 μm in the bubble diameter distribution. A pump is installed in the manhole, and in the sewage pressure feed line system that sends the sewage flowing from the upstream sewage pipe into the manhole to the downstream sewage pipe, fine bubbles are mixed in the sewage flowing through the sewage pipe. A purification apparatus for a sewage pressure feed line system comprising a fine bubble generator. The purification treatment apparatus for a sewage pressure feeding pipeline system according to claim 2, wherein the bubble diameter of the fine bubbles is 0.1 µm to 200 µm. In the fine bubble generator, a gas supply unit having an outer peripheral surface in a cylindrical shape is arranged inside a casing having an inner peripheral surface in a cylindrical shape, and sewage is disposed between the inner peripheral surface of the casing and the outer peripheral surface of the gas supply unit. The mixed gas flow channel is formed, and the mixed gas flow channel communicates at one end with the upstream pipeline of the sewage pipeline, and communicates with the downstream pipeline of the sewage pipeline at the other end of the gas containing oxygen or ozone. 4. A purification apparatus for a sewage pressure feeding line system according to claim 2 or 3, wherein the gas supply section communicating with the gas supply source is made of a porous body or a porous body having micropores. The purification treatment apparatus for a sewage pressure feed line system according to claim 4, wherein the sewage flows while swirling in the mixed air flow path. The gas supply section has a cylindrical outer peripheral surface, and the casing has a liquid supply port communicating with the upstream pipe line of the sewer pipe with the inner peripheral surface cylindrical, and the liquid supply port is tangential to the mixed gas flow path 6. A purification apparatus for a sewage pressure feed line system according to claim 4 or 5, wherein the purification treatment apparatus is connected in a direction. The micro-bubble generator has a gas supply part in which an inner peripheral surface forms a cylindrical shape inside a casing communicating with a gas supply source of gas containing oxygen or ozone, and a mixed gas flow path in which sewage flows inside the gas supply part A porous body in which the air supply channel communicates at one end with the upstream pipeline of the sewage pipeline, and communicates with the downstream pipeline of the sewage pipeline at the other end. 4. A purification apparatus for a sewage pumping line system according to claim 2 or 3, wherein the purification apparatus is made of a porous material. 8. A purification apparatus for a sewage pressure feeding line system according to claim 7, wherein the liquid swirls and flows in the mixed air flow path. The gas supply unit has a cylindrical inner peripheral surface, the air-mixing channel communicates with the liquid supply unit at one end, the liquid supply unit has a liquid supply port that communicates with the upstream side pipeline of the sewer pipe, and the inner peripheral surface has 9. A sewage pressure transmission line system according to claim 7, wherein the liquid supply port has a cylindrical shape and communicates with the air-mixing flow path, and the liquid supply port is connected to the liquid flow path in a tangential direction. Purification device.

Images