CN105523630B - Activated sludge pond - Google Patents

Activated sludge pond Download PDF

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Publication number
CN105523630B
CN105523630B CN201610061271.7A CN201610061271A CN105523630B CN 105523630 B CN105523630 B CN 105523630B CN 201610061271 A CN201610061271 A CN 201610061271A CN 105523630 B CN105523630 B CN 105523630B
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sedimentation
tank
plate
biochemical
plates
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CN105523630A (en
Inventor
王旭
李星文
杨冲
周丽颖
仲崇川
刘俊红
李京莲
袁琳
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Thunip Holdings Co Ltd
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Thunip Holdings Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/1215—Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Activated Sludge Processes (AREA)

Abstract

The invention relates to the technical field of sewage treatment equipment, in particular to an activated sludge tank which comprises a biochemical tank and a sedimentation tank arranged in the biochemical tank, wherein the sedimentation tank is a V-shaped sedimentation tank, the V-shaped sedimentation tank comprises a plurality of layers of sedimentation plates which are obliquely arranged, a water outlet tank is arranged in the sedimentation tank and is communicated with a water outlet pipeline, and the bottom of the sedimentation tank is communicated with a recovery pipeline. The invention provides an activated sludge tank, which adopts the inclined plate sedimentation tank principle, a sedimentation tank is arranged in the activated sludge tank, the effect of a secondary sedimentation tank is ensured to be achieved when effluent is discharged, and the problems of high cost and large occupied space caused by the adoption of the secondary sedimentation tank in the prior art are solved.

Description

Activated sludge pond
Technical Field
The invention relates to the technical field of sewage treatment equipment, in particular to an activated sludge tank, and more particularly relates to an activated sludge tank with a built-in sedimentation tank.
Background
Activated sludge is a general term for microorganism groups and organic substances and inorganic substances attached to the microorganism groups, and can be divided into aerobic activated sludge and anaerobic granular activated sludge. The activated sludge is mainly used for treating sewage and wastewater, and the activated sludge method is an aerobic treatment method for treating organic sewage by utilizing suspended grown microbial flocs.
The secondary sedimentation tank is an important component of the activated sludge system, and has the functions of separating sludge, clarifying mixed liquor, concentrating and refluxing the activated sludge. At present, a secondary sedimentation tank is generally arranged in a biochemical treatment system, so that activated sludge is precipitated in the secondary sedimentation tank and then flows back to the biochemical tank through an external return sludge pump.
Although the method for treating the organic sewage by utilizing the secondary sedimentation tank can better treat the organic sewage and recycle the activated sludge, the construction and operation costs of an activated sludge system with the secondary sedimentation tank and the external reflux sludge pump are higher, and the space occupation of the activated sludge system is larger.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problems of providing an activated sludge tank, which adopts the inclined plate sedimentation tank principle, a sedimentation tank is arranged in the activated sludge tank, the effect of ensuring that effluent reaches a secondary sedimentation tank is achieved, and meanwhile, the problems of high cost and large occupied space caused by adopting the secondary sedimentation tank in the prior art are solved.
(II) technical scheme
In order to solve the technical problems, the invention provides an activated sludge tank which comprises a biochemical tank and a sedimentation tank arranged in the biochemical tank, wherein the sedimentation tank is a V-shaped sedimentation tank, the V-shaped sedimentation tank comprises a plurality of layers of sedimentation plates which are obliquely arranged, a water outlet tank is arranged in the sedimentation tank and is communicated with a water outlet pipeline, and the bottom of the sedimentation tank is communicated with a recovery pipeline.
Further, the first sedimentation plate and the second sedimentation plate are arranged oppositely, the lower edges of the first sedimentation plate and the second sedimentation plate are arranged in a staggered mode, and the inclination angles of the first sedimentation plate and the second sedimentation plate are symmetrical.
Furthermore, the two ends of the first sedimentation plate and the second sedimentation plate are provided with end plates, so that the first sedimentation plate, the second sedimentation plate and the end parts form a closed structure.
Furthermore, two ends of the first sedimentation plate and the second sedimentation plate are respectively connected with the tank wall of the biochemical tank, so that the tank walls of the first sedimentation plate, the second sedimentation plate and the biochemical tank form a closed structure.
Further, the first sedimentation plate and the second sedimentation plate are respectively supported by a bracket, the lower edges of the first sedimentation plate and the second sedimentation plate are respectively fixed on two sides of the bracket, and the water outlet groove is arranged at the top end of the bracket.
Further, the upper edges of the sedimentation plates arranged on the secondary outer layer are respectively higher than the upper edges of the other sedimentation plates, and the water level of the biochemical pond is between the upper edges of the sedimentation plates on the secondary outer layer and the upper edges of the sedimentation plates arranged on the outer layer.
Further, the heights of the upper edges of the two sides of the water outlet groove are respectively higher than the upper edge of the sedimentation plate arranged on the inner layer and lower than the upper edge of the sedimentation plate arranged on the secondary outer layer; the upper edge of the sedimentation plate of the inner layer is lower than the water level in the sedimentation tank.
Further, the lower edge of the second sedimentation plate arranged on the outer layer of the sedimentation plate is provided with a mud storage groove, a mud outlet is arranged between the mud storage groove and the first sedimentation plate arranged on the outer layer of the sedimentation plate, a perforated mud discharge pipe is arranged in the mud storage groove, and the perforated mud discharge pipe is communicated with the recovery pipeline.
Furthermore, a mixed liquid reflux pump is arranged at the bottom of the water outlet end of the biochemical tank, the mixed liquid reflux pump is communicated with a reflux pipeline, and an outlet of the reflux pipeline is arranged close to the water inlet end of the biochemical tank.
Further, the number of the sedimentation tanks is one or more, and each sedimentation tank is arranged at the water outlet end of the biochemical tank in parallel.
(III) beneficial effects
The technical scheme of the invention has the following beneficial effects:
the invention provides an activated sludge tank which comprises a biochemical tank and a sedimentation tank arranged in the biochemical tank, wherein the sedimentation tank is a V-shaped sedimentation tank, the V-shaped sedimentation tank comprises a plurality of layers of sedimentation plates which are obliquely arranged, a water outlet tank is arranged in the sedimentation tank and is communicated with a water outlet pipeline, and the bottom of the sedimentation tank is communicated with a recovery pipeline. The structure of the built-in sedimentation tank can replace the traditional secondary sedimentation tank, and the sedimentation reflux function of the activated sludge can be realized in the biochemical tank.
The active sludge tank provided by the invention has the advantages that the internal volume of the V-shaped sedimentation tank is small, so that the residence time of active sludge and organic sewage is short, the biochemical treatment capacity is not reduced, and the purification efficiency is improved; and the device of the V-shaped sedimentation tank is simple, power facilities are not required to be added, and the investment and the running cost are greatly reduced.
Drawings
FIG. 1 is a schematic view of the structure of an activated sludge tank of the present invention;
FIG. 2 is a top view of the activated sludge basin of the present invention;
FIG. 3 is a cross-sectional view of a settling tank in accordance with the present invention.
Wherein, 1: a biochemical pool; 2: an aeration head; 3: a precipitation plate; 4: a water outlet tank; 5: perforating a mud pipe; 6: a mixed liquid reflux pump; 7: a return line; 8: a bracket; 9: an end plate; 10: a first precipitation plate; 11: a second precipitation plate; 12: a water outlet pipeline; 13: a recovery pipeline; 14: a water inlet pipeline; 15: a mud storage groove.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be noted that, unless otherwise indicated, the meaning of "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like refer to an orientation or positional relationship based on that shown in the drawings, for convenience of description and simplicity of description, and do not necessarily indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
As shown in fig. 1 and 2, the activated sludge tank provided in this embodiment includes a biochemical tank 1 and a sedimentation tank disposed in the biochemical tank 1, where the sedimentation tank is disposed along a width direction of the biochemical tank 1, and the number of sedimentation tanks may be one or more according to a treatment scale, and each sedimentation tank is disposed in parallel at a water outlet end of the biochemical tank 1.
The sedimentation tank is a V-shaped sedimentation tank, the V-shaped sedimentation tank comprises a plurality of layers of sedimentation plates 3 which are obliquely arranged, and the distance between the two layers of sedimentation plates 3 is 10 cm to 30cm according to the water quantity. The inside of the sedimentation tank is provided with a water outlet tank 4, the water outlet tank 4 is arranged along the length direction of the sedimentation tank, the water outlet tank 4 is communicated to the outside of the biochemical tank 1 through a water outlet pipeline 12, and the bottom of the sedimentation tank is communicated with a recovery pipeline 13. The V-shaped sedimentation tank adopts the inclined plate sedimentation principle, so that the volume of the sedimentation tank is greatly reduced, the sedimentation tank is arranged inside the activated sludge tank, the structure of the biochemical tank 1 can be simplified, the water outlet effect of the secondary sedimentation tank can be ensured, the sedimented sludge automatically slides into the biochemical tank 1, an external reflux sludge pump and a pipeline are not needed, and the cost of the activated sludge tank is reduced. In this embodiment, the residence time of the organic sewage in the V-shaped settling tank is 0.5-1h, and in the prior art, the treatment time of the organic sewage is as long as 5h by using the structure of the secondary sedimentation tank, so compared with the prior art, the sewage treatment is performed by using the V-shaped settling tank structure of this embodiment, and the treatment time of the sewage can be effectively saved.
As shown in fig. 3, the settling plate 3 includes a first settling plate 10 and a second settling plate 11 disposed opposite to each other, the first settling plate 10 is staggered with the lower edge of the second settling plate 11, and the inclination angles of the first settling plate 10 and the second settling plate 11 are symmetrical, and gaps between the first settling plate 10 and the second settling plate 11 form channels for settled sludge and clarified supernatant, respectively.
In this embodiment, the end plates 9 are disposed at both ends of the first precipitation plate 10 and the second precipitation plate 11, so that the first precipitation plate 10, the second precipitation plate 11, and the end portions form a closed structure. In addition to the structure of the present embodiment, it may be: the two ends of the first sedimentation plate 10 and the second sedimentation plate 11 are respectively connected with the tank wall of the biochemical tank 1, so that the first sedimentation plate 10, the second sedimentation plate 11 and the tank wall of the biochemical tank 1 form a closed structure. This structure can prevent water in the biochemical tank 1 from entering the water outlet tank 4 directly from the side.
The first sedimentation plate 10 and the second sedimentation plate 11 are respectively supported by the bracket 8, the lower edges of the first sedimentation plate 10 and the second sedimentation plate 11 are respectively fixed on two sides of the bracket 8, and the water outlet tank 4 is arranged at the top end of the bracket 8. In this embodiment, the support 8 is a column made of steel or concrete.
In the sedimentation tank, the upper edges of the sedimentation plates 3 arranged on the secondary outer layer are respectively higher than the upper edges of other sedimentation plates 3, and the water level of the biochemical tank 1 is between the upper edges of the sedimentation plates 3 on the secondary outer layer and the upper edges of the sedimentation plates 3 arranged on the outer layer, so that a gap between the outer layer and the two sedimentation plates 3 on the secondary outer layer forms a water inlet channel of the sedimentation tank.
The water outlet tank 4 adopts a water tank with a triangular section, and the heights of the upper edges of the two sides of the water outlet tank 4 are respectively higher than the upper edge of the sedimentation plate 3 arranged on the inner layer and lower than the upper edge of the sedimentation plate 3 arranged on the secondary outer layer; the upper edge of the inner layer sedimentation plate 3 is lower than the water level in the sedimentation tank, so that the upper edges of the two sides of the water outlet tank 4 are slightly lower than the water level in the sedimentation tank, and the water in the sedimentation tank enters the water outlet tank 4 from the two sides of the water outlet tank 4.
The lower edge of the second sedimentation plate 11 arranged on the outer sedimentation plate 3 extends out of the support 8 and is coiled up to form a mud storage groove 15, a mud outlet is arranged between the mud storage groove 15 and the first sedimentation plate 10 arranged on the outer sedimentation plate 3, a perforated mud discharging pipe 5 is arranged in the mud storage groove 15, and the perforated mud discharging pipe 5 is communicated with a recovery pipeline 13 for discharging surplus mud.
The water inlet pipeline 14 is connected at the water inlet end top of biochemical pond 1, the bottom of the water outlet end of biochemical pond 1 is equipped with mixed liquor backwash pump 6, mixed liquor backwash pump 6 intercommunication backwash pipe 7, the export of backwash pipe 7 sets up in the water inlet end that is close to biochemical pond 1 for with the mud backward flow in the sedimentation zone to biochemical pond 1 front end, with the higher mixed liquor backward flow of mud concentration of sedimentation zone lower part to biochemical zone front end, combine the setting mode of AAO activated sludge system on the one hand, play the effect of denitrification dephosphorization, reduce the terminal mud concentration of biochemical pond 1 on the one hand.
The water in the biochemical tank 1 is mixed liquid, the bottom of the biochemical tank 1 is provided with an aeration head 2, in the operation process, the mixed liquid enters a sedimentation tank through a water inlet channel, sludge in the mixed liquid is precipitated between sedimentation plates 3, when the mixed liquid flows to a position close to a support 8, supernatant with lighter specific gravity further precipitates from a region between the sedimentation plates which is upward entered into an inner layer of sedimentation plates through gaps of the sedimentation plates, sludge with heavier specific gravity flows downwards into a mud storage tank 15 below, and flow states in all layers of sedimentation plates 3 all travel according to the steps. The sludge storage tank 15 is used for removing part of surplus sludge outside the biochemical tank 1 through the perforated sludge discharge pipe 5 and the recovery pipeline 13, and most of the other sludge slides from the upper edge of the sludge storage tank 15 into the biochemical tank 1. The mixed solution entering the area between the innermost precipitation plates is continuously precipitated and clarified on the inner precipitation plates, and clarified water enters the water outlet tank 4 and is discharged out of the biochemical tank 1 after being collected by the water outlet pipeline 12. The residence time in the sedimentation tank is set to be 0.5-1h, and the space between the sedimentation plates is small, so that the sedimentation can be efficiently carried out in a short time while the use requirement is met.
When in use, the sedimentation plate 3 can be arranged into more than two layers according to the use condition, wherein the upper edge of the sedimentation plate 3 of the inner layer is lower than the water level in the sedimentation tank, so as to ensure that the mixed liquid enters the water outlet tank 4 after being sedimentated between the two layers of sedimentation plates 3.
Because the water in the biochemical tank 1 moves from the water inlet end to the area where the sedimentation tank is located, if special measures are not taken, the sludge amount in the area of the sedimentation tank is too concentrated, and the sludge amount at the water inlet end is reduced, the mixed liquid reflux pump 6 is arranged, and the mixed liquid in the area is refluxed to the water inlet end.
When this example was applied to a sewage plant of 8 ten thousand tons/day, 1 eight biochemical tanks were provided. The biochemical tank 1 has a monomer length of 50m, a monomer width of 20m, a monomer depth of 6m and a monomer treatment capacity of 0.5 ten thousand tons/day. Four sedimentation tanks with the length of 20m are arranged at the water outlet end of each tank, the width (the distance between the upper edges of the outer sedimentation plates 3) of each sedimentation tank is 1.5m, the height (the distance between the lower edges of the outer sedimentation plates and the water surface) is 1.6m, six layers of sedimentation plates 3 are arranged, the distance between the two layers of sedimentation plates 3 is 25cm, and the tank distance (the distance between the upper edges of the outer sedimentation plates 3 of the two sedimentation tanks) is 1m. The total volume of the single sedimentation tank is 25m 3 Total volume of 100m 3 The average residence time of the mixed solution in the device is 0.5h, the total width of the sedimentation zone is 10m, two mixed solution reflux pumps 6 are arranged, the treatment requirement of the sewage plant can be well met, andthe investment and the running cost of the sewage plant are reduced.
Example two
The present embodiment is similar to the first embodiment in structure, the principle is the same, and the differences are: the present embodiment provides a 50m 3 The width of each Chi Tichang of the activated sludge pond/h is 10m, the depth of each Chi Tichang m is 5m, and the pond body adopts a running mode of lower inlet and upper outlet. Three sedimentation tanks are arranged on the upper surface of the tank, the length of each sedimentation tank is 10m, the width and the height of each sedimentation tank are 1.8m, six layers of sedimentation plates 3 are arranged, the distance between the two layers of sedimentation plates 3 is 30cm, the distance between the two layers of sedimentation plates is 1m, and the total width of each sedimentation tank is 8m. The tank is a completely mixed biochemical tank 1 with lower inlet and upper outlet, so the mixed liquid reflux pump 6 is not included. The mean residence time of the device was 0.5h.
The embodiments of the invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (4)

1. The activated sludge pond is characterized by comprising a biochemical pond and a sedimentation tank arranged in the biochemical pond, wherein the sedimentation tank is a V-shaped sedimentation tank, the V-shaped sedimentation tank comprises a plurality of layers of sedimentation plates which are obliquely arranged, a water outlet tank is arranged in the sedimentation tank and is communicated with a water outlet pipeline, and the bottom of the sedimentation tank is communicated with a recovery pipeline;
the sedimentation plate comprises a first sedimentation plate and a second sedimentation plate which are oppositely arranged, the lower edges of the first sedimentation plate and the second sedimentation plate are arranged in a staggered manner, and the inclination angles of the first sedimentation plate and the second sedimentation plate are symmetrical;
the two ends of the first sedimentation plate and the second sedimentation plate are respectively connected with the tank wall of the biochemical tank, so that the first sedimentation plate, the second sedimentation plate and the tank wall of the biochemical tank form a closed structure;
the upper edges of the sedimentation plates arranged on the secondary outer layer are respectively higher than the upper edges of the other sedimentation plates, and the water level height of the biochemical tank is between the upper edges of the sedimentation plates on the secondary outer layer and the upper edges of the sedimentation plates arranged on the outer layer;
the heights of the upper edges of the two sides of the water outlet groove are respectively higher than the upper edges of the sedimentation plates arranged on the inner layer and lower than the upper edges of the sedimentation plates arranged on the secondary outer layer; the upper edge of the sedimentation plate of the inner layer is lower than the water level in the sedimentation tank;
the lower edge of the second sedimentation plate of the sedimentation plate arranged on the outer layer is provided with a mud storage groove, a mud outlet is arranged between the mud storage groove and the first sedimentation plate of the sedimentation plate arranged on the outer layer, a perforated mud discharge pipe is arranged in the mud storage groove, and the perforated mud discharge pipe is communicated with the recovery pipeline.
2. The activated sludge tank as claimed in claim 1, wherein the first and second settling plates are supported by brackets, lower edges of the first and second settling plates are fixed to both sides of the brackets, respectively, and the water outlet tank is provided at the top end of the brackets.
3. The activated sludge tank as claimed in claim 2, wherein a mixed liquor reflux pump is arranged at the bottom of the water outlet end of the biochemical tank, the mixed liquor reflux pump is communicated with a reflux pipeline, and an outlet of the reflux pipeline is arranged near the water inlet end of the biochemical tank.
4. The activated sludge tank as claimed in any one of claims 1 to 3, wherein the number of the sedimentation tanks is one or more, and each sedimentation tank is disposed in parallel at the water outlet end of the biochemical tank.
CN201610061271.7A 2016-01-28 2016-01-28 Activated sludge pond Active CN105523630B (en)

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CN105523630B true CN105523630B (en) 2023-09-19

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000117005A (en) * 1998-10-09 2000-04-25 Japan Organo Co Ltd Flocculating and settling method and device
EP1072559A2 (en) * 1999-07-26 2001-01-31 INGERLE, Kurt Device for wastewater purification
CN203598540U (en) * 2013-10-31 2014-05-21 南京源泉环保科技股份有限公司 Vertical flow sedimentation tank
CN204607683U (en) * 2015-05-14 2015-09-02 成都绿源新创环保科技有限公司 A kind of integrated sewage treatment device
CN205556218U (en) * 2016-01-28 2016-09-07 浦华环保股份有限公司 Activated sludge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000117005A (en) * 1998-10-09 2000-04-25 Japan Organo Co Ltd Flocculating and settling method and device
EP1072559A2 (en) * 1999-07-26 2001-01-31 INGERLE, Kurt Device for wastewater purification
CN203598540U (en) * 2013-10-31 2014-05-21 南京源泉环保科技股份有限公司 Vertical flow sedimentation tank
CN204607683U (en) * 2015-05-14 2015-09-02 成都绿源新创环保科技有限公司 A kind of integrated sewage treatment device
CN205556218U (en) * 2016-01-28 2016-09-07 浦华环保股份有限公司 Activated sludge

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