CN113041663A - Method for treating wastewater by utilizing composite efficient sedimentation tank - Google Patents
Method for treating wastewater by utilizing composite efficient sedimentation tank Download PDFInfo
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- CN113041663A CN113041663A CN202110300188.1A CN202110300188A CN113041663A CN 113041663 A CN113041663 A CN 113041663A CN 202110300188 A CN202110300188 A CN 202110300188A CN 113041663 A CN113041663 A CN 113041663A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/003—Sedimentation tanks provided with a plurality of compartments separated by a partition wall
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
- B01D21/0042—Baffles or guide plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/245—Discharge mechanisms for the sediments
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Abstract
The invention relates to a method for treating wastewater by using a composite high-efficiency sedimentation tank, which comprises the steps of using the composite high-efficiency sedimentation tank, wherein the sedimentation tank comprises a natural sedimentation zone I and a sedimentation zone II, the natural sedimentation zone I is provided with a water inlet device and a water distribution zone connected with the water inlet device, the water distribution zone is provided with a guide wall, a mud bucket I is arranged below the natural sedimentation zone I, and the mud bucket I is provided with a mud pipe; a mud-water separation device is arranged above the sedimentation zone II and comprises a support frame, a filler is arranged above the support frame, a water outlet groove is arranged above the filler and is connected with a drainage groove, the drainage groove is provided with a drainage outlet, and the drainage outlet is provided with a drainage pipe; and a mud bucket II is arranged below the settling zone II and is provided with a mud pipe. The invention has high treatment efficiency and good sedimentation effect, the problem of collapse caused by the blockage of the filler does not exist at the water inlet end of the sedimentation tank, and the system is stable in operation.
Description
Technical Field
The invention relates to the technical field of environment-friendly water treatment and purification, in particular to a method for treating wastewater by using a composite efficient sedimentation tank.
Background
Along with the continuous reinforcing of country and local to the management and control dynamics of environmental protection improvement, sewage discharge standard is constantly stricter, and is also more and more strict to the requirement of going out the water suspended solid, seeks the sedimentation tank that the settling property is good and becomes inevitable trend. The common sedimentation tank has a low surface load design value for improving the effluent quality, but increases the floor area of the sedimentation tank, has high cost, is not beneficial to saving cost for enterprises, and has the problems of unstable effluent quality, floating sludge and the like. The conventional inclined tube sedimentation tank has poor impact load resistance, the sludge on the filler at the water inlet end of the sedimentation tank is seriously blocked, and the problem of filler collapse is very easy to occur, so that the system cannot normally run.
In addition, chinese patent document CN 207356638U discloses a horizontal flow type inclined plate sedimentation tank, which comprises a tank body, a sewage inlet zone, a treated water outlet zone, a sedimentation zone located between the sewage inlet zone and the treated water outlet zone, and a sludge hopper disposed at the bottom of the tank body corresponding to the sedimentation zone. However, the sedimentation tank is filled with water from two ends, all the fillers are filled from the front end to the rear end, the kinetic energy of the water at the water inlet end of the sedimentation tank is large, the sludge concentration is high, the fillers at the two water inlet ends of the sedimentation tank are seriously blocked, the problem of filler collapse is caused, the effluent SS rises, and the system operation is seriously influenced due to the filler collapse.
Chinese patent document CN 212293059U discloses a sedimentation tank for sewage treatment, including the sedimentation tank main part, the sedimentation tank main part is the tubular structure of no top end, the bottom fixedly connected with funnel groove of sedimentation tank main part, the inboard of sedimentation tank main part is provided with the flitch, the upper surface middle part position department fixed mounting of top cap has driving motor, driving motor's output shaft end and the top fixed connection of flitch, vertically be fixed with two scraper blades on the outer peripheral face of flitch, the equal fixed mounting in bottom of two scraper blades has the brush mounting panel, one side fixed mounting that the brush mounting panel is close to the funnel groove has the clearance brush, the last fixed surface of fan-shaped backup pad installs the filter, the active carbon board. However, the sedimentation tank adopts a motor to drive the scraper for preventing blockage, and the brush is arranged on the scraper, so that the device is only suitable for the cylindrical sedimentation tank on the one hand, the brush device is complex in mechanism and difficult to maintain underwater, and the system effluent SS can be increased when the brush is cleaned, thereby affecting the effluent effect.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for treating wastewater by using a composite efficient sedimentation tank, so as to solve the problems of uneven effluent quality and sludgeFloating, filler blocking and collapse, and is suitable for treating small water amount (less than or equal to 4000 m)3The waste water of the/d).
The technical scheme of the invention is as follows:
a method for treating wastewater by using a composite high-efficiency sedimentation tank comprises the steps of using the composite high-efficiency sedimentation tank, wherein the sedimentation tank comprises a natural sedimentation area I and a sedimentation area II, and the natural sedimentation area I is communicated with the sedimentation area II through a water wall; the natural settling zone I is provided with a water inlet device and a water distribution area connected with the water inlet device, the water inlet device is provided with a water inlet pipe, the water distribution area is provided with a flow guide wall, a mud bucket I is arranged below the natural settling zone I, and the mud bucket I is provided with a mud discharge pipe;
a mud-water separation device is arranged above the sedimentation zone II and comprises a support frame, a filler is arranged above the support frame, a water outlet groove is arranged above the filler and connected with a drainage groove, the drainage groove is provided with a drainage port, and the drainage port is provided with a drainage pipe; a mud bucket II is arranged below the settling zone II, and is provided with a mud pipe;
the method comprises the following steps:
the wastewater enters a water distribution area through a water inlet pipe, uniformly enters a natural sedimentation area I for primary sedimentation through the flow dividing effect of a flow guide wall, and sludge enters a sludge hopper I; the wastewater after primary sedimentation enters a sedimentation area II through a water wall and is sedimentated again through an internal filler, water flows upwards along the filler, and the separated sludge slides downwards to a sludge hopper II along the filler under the action of gravity; the treated wastewater is converged into a drainage tank through a water outlet tank and is discharged through a drainage pipe arranged in the drainage tank; and the sludge of the mud bucket I and the mud bucket II is discharged through a sludge discharge pipe under self-pressure.
According to the invention, preferably, the length of the natural settling zone I is less than or equal to one half of the total length of the settling pond body.
According to the invention, preferably, the guide wall is provided with openings, and water flow uniformly enters the natural settling area I through the openings. Further preferably, the openings can be round holes or square holes, and the total area of the openings is 0.5 per thousand-20% of the area of the flow guide wall.
According to the invention, preferably, the filler is an inclined plate filler or an inclined tube filler; further preferably, the inclination angle of the filler is 45-78 degrees, and the vertical height of the filler is 200-1800 mm.
According to the invention, preferably, the water outlet groove is a single water outlet groove or two or more water outlet grooves.
According to the invention, the drainage channel is preferably arranged on the inner side wall or the outer side wall of the sedimentation zone II.
According to the invention, the side walls of the mud bucket I and the mud bucket II are preferably inclined at an angle of 50-60 degrees.
The invention has not been described in detail, but is in accordance with the state of the art.
The invention has the beneficial effects that:
1. the invention combines the advantages of a vertical sedimentation tank and an inclined plate or inclined tube sedimentation tank, so that suspended impurities in water are subjected to gravity sedimentation in a natural sedimentation area I, mud and water are separated, sludge enters a mud bucket I, water flow enters a sedimentation area II through a water wall and is subjected to sedimentation again through the inclined plate or inclined tube, water rises along the inclined plate or inclined tube and flows, and the separated sludge slides downwards into the mud bucket II along the inclined plate or inclined tube under the action of gravity. Compared with the conventional sedimentation tank, the composite efficient sedimentation tank can improve the sedimentation efficiency by 50-60%, controls suspended matters in water of system effluent to be 5-30 mg/L, and has high treatment efficiency and good sedimentation effect.
2. The sludge in the mud bucket I and the mud bucket II is discharged under the self-pressure through the mud discharge pipe, so that the continuous and uniform discharge can be realized, the problem of sludge accumulation can not be caused, and the stable operation of the system can be ensured.
3. The invention avoids the filler collapse phenomenon caused by the sludge blockage of the filler at the water inlet end of the conventional inclined tube sedimentation tank through special design, and the sedimentation tank has strong impact load resistance and stable system operation.
4. The composite efficient sedimentation tank has the advantages of simple structure, convenient operation, energy consumption saving and low use cost. The design value of the surface load of the sedimentation tank is improved to 0.8-3.5 tons of water/square meter/day, and compared with the conventional advection type and radial flow type sedimentation tanks, the surface load of the sedimentation tank greatly saves the occupied area and saves the land resources.
Drawings
FIG. 1 is a schematic main view of a settling tank of the present invention.
Wherein: 1-water inlet pipe; 2-a guide wall; 3-a natural settling zone I; 4-water outlet groove; 5-a drainage tank; 6, a drain pipe; 7-a filler; 8-a support frame; 9-a precipitation zone II; 10-a sludge discharge pipe; 11-a mud bucket II; 12-a mud bucket I; 13-Water wall.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
a method for treating wastewater by using a composite high-efficiency sedimentation tank comprises the steps of using the composite high-efficiency sedimentation tank, wherein the sedimentation tank comprises a natural sedimentation zone I3 and a sedimentation zone II11, and the natural sedimentation zone I3 is communicated with a sedimentation zone II11 through a water wall 13; the natural sedimentation zone I3 is provided with a water inlet device and a water distribution area connected with the water inlet device, the water inlet device is provided with a water inlet pipe 1, the water distribution area is provided with a guide wall 2, a mud bucket I12 is arranged below the natural sedimentation zone I3, and a mud discharge pipe 10 is arranged at the mud bucket I12;
a mud-water separation device is arranged above the sedimentation zone II 9 and comprises a support frame 8, a filler 7 is arranged above the support frame 8, a water outlet groove 4 is arranged above the filler 7, the water outlet groove 4 is connected with a drainage groove 5, the drainage groove 5 is provided with a drainage port, and the drainage port is provided with a drainage pipe 6; a mud bucket II11 is arranged below the sedimentation zone II 9, a mud pipe 10 is arranged on the mud bucket II11, and sludge is discharged under self-pressure through the mud pipe 10;
the side wall inclination angle of the mud bucket I12 is 50 degrees, the side wall inclination angle of the mud bucket II11 is 50 degrees, the filler 7 is an inclined plate filler, the inclination angle of the filler 7 is 55 degrees, the vertical height of the filler 7 is 800mm, and the filler 7 is made of polyvinyl chloride; the water outlet grooves 4 are two, and the water drainage groove 5 is arranged on the outer side wall of the sedimentation zone II 9. The openings are round holes, and the total area of the openings is 5% of the area of the flow guide wall.
The method comprises the following steps:
wastewater enters a water distribution area through a water inlet pipe 1, uniformly enters a natural sedimentation area I3 for primary sedimentation through the flow dividing effect of a flow guide wall 2, and sludge enters a mud bucket I12; the primarily precipitated wastewater enters a precipitation area II 9 through a water wall 13 and is precipitated again through an internal filler 7, water flows upwards along the filler 7, and separated sludge slides downwards along the filler 7 to a sludge hopper II11 under the action of gravity; the treated wastewater is converged into a drainage tank 5 through a water outlet tank 4 and is discharged through a drainage pipe 6 arranged in the drainage tank 5; the sludge in the mud bucket I12 and the mud bucket II11 is discharged through the mud pipe 10 under self-pressure.
Example 2:
a method of treating wastewater using a composite high efficiency settling tank, comprising using a composite high efficiency settling tank having the structure as in example 1 except that: the filler 7 is an inclined tube filler, the inclination angle of the filler 7 is 65 degrees, the vertical height of the filler 7 is 1000mm, and the filler 7 is made of polypropylene; the side wall inclination angles of the mud bucket I12 and the mud bucket II11 are 55 degrees; the sedimentation zone II 9 is provided with a water outlet groove 4, and one water outlet groove 4 is arranged; the water outlet groove 4 is connected with a water drainage groove 5, and the water drainage groove 5 is arranged on the inner side wall of the sedimentation zone II 9. The openings are square holes, and the total area of the openings is 10% of the area of the flow guide wall.
Example 3:
a method of treating wastewater using a composite high efficiency settling tank, comprising using a composite high efficiency settling tank having the structure as in example 1 except that: the filler 7 is an inclined plate filler, the inclination angle of the filler 7 is 75 degrees, the vertical height of the filler 7 is 1500mm, and the filler 7 is made of glass fiber reinforced plastic; the side wall inclination angles of the mud bucket I12 and the mud bucket II11 are 60 degrees; the sedimentation zone II 9 is provided with a water outlet groove 4, and one water outlet groove 4 is arranged; the water outlet groove 4 is connected with the water drainage groove 5, and the water drainage groove 5 is arranged on the outer side wall of the sedimentation zone II 9. The openings are round holes, and the total area of the openings is 15% of the area of the flow guide wall.
Comparative example 1:
a sedimentation tank with a sludge discharge device is characterized in that sludge and water enter the sedimentation tank through one side, and are separated by gravity; the sludge falls into the bottom of the sedimentation tank, and the sludge at the bottom enters a mud bucket along with the movement of the mud scraper and is discharged; and the wastewater is discharged through an overflow weir at the top of the sedimentation tank, a water collecting tank and a drain pipe. This sedimentation tank relies on gravity sedimentation effect alone, and the sedimentation effect is not as good as shallow layer sedimentation effect, and effluent quality of water is unstable, and has the row mud device, increases the power consumption, increases use cost.
Comparative example 2:
a radial flow sedimentation tank, muddy water enters the sedimentation tank through a water inlet pipe and a central cylinder, stays in the sedimentation tank for a certain time, and is subjected to muddy water separation under the action of gravity; the sludge sinks to the bottom and is collected and discharged out of the system through a sludge scraper; the wastewater overflows into a water collecting tank through a water outlet weir at the periphery of the sedimentation tank and is discharged. The surface load design value of the sedimentation tank is 0.4-0.6 ton/sq m/day, the treatment efficiency is low, the occupied area is large, the civil engineering investment is high, and the sedimentation tank is not suitable for treating wastewater with small water volume.
Test example:
the wastewater treatment methods in example 1 and comparative examples 1 to 2 were each subjected to an effect test. The wastewater to be treated is the wastewater after pretreatment, biochemical treatment and advanced oxidation treatment, and the concentration of suspended matters in the wastewater after advanced oxidation treatment is 550 mg/L. The wastewater enters a sedimentation tank for sedimentation, tests are respectively carried out according to the methods in the example 1 and the comparative examples 1-2, and the experimental data are detailed in the table 1.
TABLE 1
| Item | Example 1 | Comparative example 1 | Comparative example 2 |
| Before treatment, suspended matter mg/L | 550 | 550 | 550 |
| After treatment, the suspended matter mg/L of the effluent is | 11 | 46 | 43 |
| Stability of effluent quality | Stabilization | Instability of the film | Instability of the film |
As can be seen from Table 1, the concentration of suspended solids in the effluent was 11mg/L and the quality of the effluent was stable in example 1, while the concentration of suspended solids in the effluent was 43 to 46mg/L and the quality of the effluent was unstable in comparative examples 1 to 2. The data show that the invention can reduce the concentration value of the suspended matters in the effluent and improve the precipitation efficiency of the wastewater. Meanwhile, the filler collapse phenomenon caused by the blockage of the filler at the water inlet end of the conventional inclined tube sedimentation tank due to sludge can be avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for treating wastewater by using a composite high-efficiency sedimentation tank comprises the steps of using the composite high-efficiency sedimentation tank, wherein the sedimentation tank comprises a natural sedimentation area I and a sedimentation area II, and the natural sedimentation area I is communicated with the sedimentation area II through a water wall; the natural settling zone I is provided with a water inlet device and a water distribution area connected with the water inlet device, the water inlet device is provided with a water inlet pipe, the water distribution area is provided with a flow guide wall, a mud bucket I is arranged below the natural settling zone I, and the mud bucket I is provided with a mud discharge pipe;
a mud-water separation device is arranged above the sedimentation zone II and comprises a support frame, a filler is arranged above the support frame, a water outlet groove is arranged above the filler and connected with a drainage groove, the drainage groove is provided with a drainage port, and the drainage port is provided with a drainage pipe; a mud bucket II is arranged below the settling zone II, and is provided with a mud pipe;
the method comprises the following steps:
the wastewater enters a water distribution area through a water inlet pipe, uniformly enters a natural sedimentation area I for primary sedimentation through the flow dividing effect of a flow guide wall, and sludge enters a sludge hopper I; the wastewater after primary sedimentation enters a sedimentation area II through a water wall and is sedimentated again through an internal filler, water flows upwards along the filler, and the separated sludge slides downwards to a sludge hopper II along the filler under the action of gravity; the treated wastewater is converged into a drainage tank through a water outlet tank and is discharged through a drainage pipe arranged in the drainage tank; and the sludge of the mud bucket I and the mud bucket II is discharged through a sludge discharge pipe under self-pressure.
2. The method for treating wastewater by using the composite high-efficiency sedimentation tank as claimed in claim 1, wherein the length of the natural sedimentation zone I is less than or equal to one half of the total length of the sedimentation tank body.
3. The method for treating wastewater by using a composite high-efficiency sedimentation tank as claimed in claim 1, wherein the guide wall is provided with openings through which water flows uniformly into the natural sedimentation zone I.
4. The method for treating wastewater by using the composite high-efficiency sedimentation tank as claimed in claim 3, wherein the openings are round holes or square holes.
5. The method for treating wastewater by using the composite high-efficiency sedimentation tank as claimed in claim 3, wherein the total area of the openings is 0.5 per mill-20% of the area of the guide wall.
6. The method for treating wastewater by using the composite high-efficiency sedimentation tank as claimed in claim 1, wherein the filler is an inclined plate filler or an inclined tube filler.
7. The method for treating wastewater by using the composite high-efficiency sedimentation tank as claimed in claim 6, wherein the inclination angle of the inclined plate packing or the inclined tube packing is 45-78 °;
preferably, the vertical height of the filler is 200-1800 mm;
preferred materials for the filler are polypropylene, polyvinyl chloride or glass fibre reinforced plastic.
8. The method for treating wastewater by using the composite high-efficiency sedimentation tank as claimed in claim 1, wherein the water outlet tank is a single water outlet tank or two or more water outlet tanks.
9. The method for treating wastewater by using a composite high-efficiency sedimentation tank as claimed in claim 1, wherein the drainage channel is provided on the inner side wall or the outer side wall of the sedimentation zone II.
10. The method for treating wastewater by using the composite high-efficiency sedimentation tank as claimed in claim 1, wherein the inclination angles of the side walls of the hopper I and the hopper II are 50-60 °.
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| CN202110300188.1A CN113041663A (en) | 2021-03-22 | 2021-03-22 | Method for treating wastewater by utilizing composite efficient sedimentation tank |
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| CN202110300188.1A CN113041663A (en) | 2021-03-22 | 2021-03-22 | Method for treating wastewater by utilizing composite efficient sedimentation tank |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113457225A (en) * | 2021-08-04 | 2021-10-01 | 山东环发科技开发有限公司 | Method for treating wastewater by efficient integrated sedimentation tank |
| CN113603216A (en) * | 2021-08-24 | 2021-11-05 | 彭吉成 | Efficient contact type anaerobic reactor and method for treating wastewater |
| CN113716681A (en) * | 2021-09-01 | 2021-11-30 | 山东环发科技开发有限公司 | Efficient integrated aerobic biochemical wastewater treatment method |
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| SU1745690A1 (en) * | 1989-05-31 | 1992-07-07 | Ташкентский Политехнический Институт Им.А.Р.Бируни | Clarifier with suspended precipitate for water purification |
| CN205340236U (en) * | 2015-12-24 | 2016-06-29 | 广东水清环保科技有限公司 | Useless water sedimentation device |
| CN206896912U (en) * | 2017-06-07 | 2018-01-19 | 李璐 | A kind of intensified by ultrasonic wave without blocking inclined tube or inclined-plate clarifying basin |
| CN108423788A (en) * | 2018-05-25 | 2018-08-21 | 浙江工业大学 | Without medicament secondary waterpower coagulation assisted pond |
| CN110860112A (en) * | 2019-11-29 | 2020-03-06 | 山东环发科技开发有限公司 | Method for treating wastewater by using circular sedimentation tank with mechanical sludge discharge device |
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2021
- 2021-03-22 CN CN202110300188.1A patent/CN113041663A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| SU1745690A1 (en) * | 1989-05-31 | 1992-07-07 | Ташкентский Политехнический Институт Им.А.Р.Бируни | Clarifier with suspended precipitate for water purification |
| CN205340236U (en) * | 2015-12-24 | 2016-06-29 | 广东水清环保科技有限公司 | Useless water sedimentation device |
| CN206896912U (en) * | 2017-06-07 | 2018-01-19 | 李璐 | A kind of intensified by ultrasonic wave without blocking inclined tube or inclined-plate clarifying basin |
| CN108423788A (en) * | 2018-05-25 | 2018-08-21 | 浙江工业大学 | Without medicament secondary waterpower coagulation assisted pond |
| CN110860112A (en) * | 2019-11-29 | 2020-03-06 | 山东环发科技开发有限公司 | Method for treating wastewater by using circular sedimentation tank with mechanical sludge discharge device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113457225A (en) * | 2021-08-04 | 2021-10-01 | 山东环发科技开发有限公司 | Method for treating wastewater by efficient integrated sedimentation tank |
| CN113603216A (en) * | 2021-08-24 | 2021-11-05 | 彭吉成 | Efficient contact type anaerobic reactor and method for treating wastewater |
| CN113716681A (en) * | 2021-09-01 | 2021-11-30 | 山东环发科技开发有限公司 | Efficient integrated aerobic biochemical wastewater treatment method |
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