CN110860112A - Method for treating wastewater by using circular sedimentation tank with mechanical sludge discharge device - Google Patents
Method for treating wastewater by using circular sedimentation tank with mechanical sludge discharge device Download PDFInfo
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- CN110860112A CN110860112A CN201911201593.7A CN201911201593A CN110860112A CN 110860112 A CN110860112 A CN 110860112A CN 201911201593 A CN201911201593 A CN 201911201593A CN 110860112 A CN110860112 A CN 110860112A
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- sedimentation tank
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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
- B01D21/02—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
- B01D21/2405—Feed mechanisms for settling tanks
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
Abstract
The invention relates to a method for treating wastewater by using a circular sedimentation tank with a mechanical sludge discharge device, which comprises the following steps: the method comprises the following steps of enabling waste water to be treated to enter a central cylinder through a water inlet pipe, distributing the waste water to a mud-water separation device through the central cylinder, after mud-water separation is completed in the mud-water separation device through fillers, collecting clear water to a water outlet groove through a water discharge groove, discharging the clear water through a water outlet, enabling separated sludge to fall to the bottom of a sedimentation tank main body, and collecting and discharging the sludge through a sludge scraper. The invention can carry out large-scale wastewater treatment, has the advantages of simple operation, strong adaptability, stable operation and the like, can improve the precipitation efficiency by 50-60 percent, and reduces suspended matters in water of system effluent to 5-25 mg/L.
Description
Technical Field
The invention relates to a method for treating wastewater by using a circular sedimentation tank with a mechanical sludge discharge device, belonging to the technical field of environment-friendly water treatment and purification.
Background
In recent years, with the gradual implementation of national environmental protection policies, the investment construction of industrial enterprises on sewage treatment systems is gradually strengthened. As the available water amount of all people in our country is relatively low, the use cost of industrial water is increased year by year, the sewage discharge requirement is continuously improved and stricter, the national requirement on effluent suspended matters is more and more strict, the GB3544-2008 standard pulping and papermaking wastewater discharge standard requires that SS is less than or equal to 30mg/L, the effluent of the wastewater suspended matters treated by a common sedimentation tank is generally between 30 and 50mg/L, and the indexes of the effluent suspended matters cannot meet the discharge standard requirement.
The common sedimentation tank has a low design value of surface load for improving the effluent quality requirement, generally 0.4-0.6 ton/square meter/day, the common sedimentation tank adopts an inclined plate or an inclined pipe as a filler, but because a static pressure sludge discharge mode is adopted, when a large water amount is treated (the water amount is more than 2000m 3/d), a multi-hopper sludge discharge mode is adopted, so that the sludge inlet amount of each hopper is unevenly distributed, the sludge discharge amount of each hopper cannot be accurately controlled, the continuous long-term operation easily causes uneven sludge discharge of the hoppers, some hoppers can seriously accumulate sludge to cause sludge floating, the effluent suspended solids are greatly changed, and the discharge standard requirement cannot be met. Chinese patent document CN206295636U discloses an inclined plate and inclined tube sedimentation tank, which comprises a sedimentation container, an inclined plate and inclined tube body, and an overflow weir, wherein the inclined plate and inclined tube body is arranged in the sedimentation container, the overflow weir is arranged above the inclined plate and inclined tube body, and the sedimentation container is provided with a water inlet; the water inlet is open and is positioned at the bottom of the container, and water flows upwards vertical to the inclined pipe body of the inclined plate; the periphery of the overflow weir is provided with a reservoir which is connected with a water outlet; the overflow weir comprises a main wall body and a height-adjustable wall body, the height-adjustable wall body is connected with the main wall body through a height adjusting mechanism, and the top of the main wall body is flexibly connected with the top of the height-adjustable wall body; the height adjusting mechanism comprises a controller, an adjusting motor and an adjusting track, and the controller is connected with the adjusting motor and the liquid level sensor. But the sedimentation tank has the problem of higher concentration of suspended matters in the effluent.
Chinese patent document CN105999776A discloses a sludge layer filtering sedimentation tank and a method thereof, which comprises a tank body, a water inlet pipe, a water outlet pipe, a water distributor and a sludge discharge pipe, wherein the water inlet pipe is arranged at the lower part of the tank body, the lower part of the other side of the tank body is provided with the sludge discharge pipe, the upper part of the tank body is provided with the water outlet pipe, a barrier with an opening at the upper part is arranged around a sludge discharge port of the sludge discharge pipe to form a sludge hopper, and a slag separating plate with an opening at the upper part is arranged around a water outlet of the water; the water inlet pipe is also connected with a water distributor arranged in the tank body. The square sedimentation tank adopted by the method has high suspended matter in the effluent, wide occupied area and higher cost, and is particularly not beneficial to the popularization and the application of the sedimentation tank for the advanced treatment of the wastewater.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for treating wastewater by using a circular sedimentation tank with a mechanical sludge discharge device, which can treat wastewater on a large scale, improve the efficiency of wastewater treatment and reduce suspended matters in effluent.
The technical scheme of the invention is as follows:
a method for treating wastewater by using a circular sedimentation tank with a mechanical sludge discharge device comprises the steps that the circular sedimentation tank with the mechanical sludge discharge device comprises a sedimentation tank main body, the sedimentation tank main body is provided with the mechanical sludge discharge device, and the mechanical sludge discharge device comprises a sludge scraper positioned at the bottom of the sedimentation tank main body and a motor connected through a transmission shaft; a mud-water separation device is further arranged at the part, above the mud scraper, in the sedimentation tank main body, and comprises a support frame, and a filler is arranged on the support frame;
a water outlet groove is formed in the side wall of the sedimentation tank body, a water drainage groove is formed above the mud-water separation device and is connected with the water outlet groove, and a water outlet is formed in the water outlet groove;
the sedimentation tank main body also comprises a water inlet device, the water inlet device comprises a water inlet pipe, and the water inlet pipe is connected with the mud-water separation device through a central cylinder;
the method for treating wastewater comprises the following steps:
the method comprises the following steps of enabling waste water to be treated to enter a central cylinder through a water inlet pipe, distributing the waste water to a mud-water separation device through the central cylinder, after mud-water separation is completed in the mud-water separation device through fillers, collecting clear water to a water outlet groove through a water discharge groove, discharging the clear water through a water outlet, enabling separated sludge to fall to the bottom of a sedimentation tank main body, and collecting and discharging the sludge through a sludge scraper.
According to the invention, the surface load design value of the sedimentation tank is preferably 0.8-3.5 tons of water per square meter per day, and the suspended matter of the effluent is 5-25 mg/L.
According to the invention, the filler is preferably an inclined tube filler or an inclined plate filler; further preferably, the inclination angle of the filler is 45-78 degrees, and the vertical height of the filler is 200-1800 mm; further preferably, the material of the filler is selected from polypropylene, polyvinyl chloride or glass fiber reinforced plastic.
According to the invention, in the preferable mechanical sludge discharge device, a reduction box is arranged below the motor. For maintaining the stability of the motor.
According to the invention, the water outlet groove is preferably arranged on the inner side wall or the outer side wall of the sedimentation tank body.
According to the invention, the vertical distance between the mud-water separation device and the mud scraper is preferably 200-30000 mm.
According to the invention, the bottom of the sedimentation tank main body is preferably provided with a sludge collecting groove. For storing sludge collected by the scraper.
According to the invention, the mud collecting groove is preferably provided with a mud discharging pipe. For discharging the sludge.
According to the invention, the drainage channel is preferably composed of a single drainage channel pipeline or two or more drainage channel pipelines; further preferably, the drainage system consists of 4-10 drainage channel pipelines.
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 adopts a circular sedimentation tank with a mechanical mud discharging device, the sedimentation tank is redesigned on the basis of the existing water treatment sedimentation tank, a mode of water outlet at the periphery of the central water inlet is adopted, the whole sedimentation tank is divided into a water inlet area, a separation area, a rectifying area and a mud discharging area, a plurality of intensive inclined pipes or inclined plates are arranged in the separation area, the mud separated by the inclined plates or inclined pipes falls to the mud discharging area through the rectifying area under the action of gravity and then is discharged out of the tank through the mechanical mud discharging device, and the separated clear water is collected by the water outlet groove at the upper parts of the inclined plates or inclined pipes and then is discharged out of the tank through a water collecting groove. The invention combines the advantages of the radial flow sedimentation tank and the inclined plate or inclined tube sedimentation tank, so that suspended impurities in water are precipitated in the inclined plate or inclined tube, water flows upwards along the inclined plate or inclined tube, separated sludge slides downwards to a sludge discharge area along the inclined plate or inclined tube under the action of gravity, sludge accumulation at the bottom of the tank and sludge deposition of sludge discharge pipelines are reduced, the sedimentation efficiency can be improved by 50-60%, and suspended matters in water discharged from the system are reduced to 5-25 mg/L.
2. The sedimentation tank is integrally stressed in an annular manner by adopting a circular structure, so that the problem that the construction cost of the sedimentation tank is higher due to the fact that a single-side straight wall of a square sedimentation tank bears pressure is solved, meanwhile, the sedimentation tank can save the floor area of 1/2-5/6 compared with a common advection or amplitude flow sedimentation tank, and precious land resources are greatly saved.
3. The circular sedimentation tank with the mechanical sludge discharge device can continuously and uniformly discharge sludge falling into a sludge discharge area through the sludge discharge device, does not cause sludge accumulation, ensures the continuous and stable operation of a system, improves the surface load design value of the conventional sedimentation tank from 0.4 to 0.6 ton/square meter/day to 0.8 to 3.5 ton/square meter/day, solves the problem that the conventional sedimentation tank is only suitable for small-sized water treatment, can treat wastewater on a large scale, and has the advantages of simple operation, strong adaptability, stable operation and the like.
Drawings
Fig. 1 is a schematic structural diagram of a circular sedimentation tank with a mechanical sludge discharge device in the invention.
FIG. 2 is a schematic diagram of the arrangement of the water outlet device of the sedimentation tank in the invention.
Fig. 3 is a schematic structural view of a mud scraper and a mud collecting tank of the sedimentation tank of the invention.
Wherein: 1. the device comprises a motor, 2, a reduction gearbox, 3, a transmission shaft, 4, a filler, 5, a support frame, 6, a mud scraper, 7, a mud collecting groove, 8, a central cylinder, 9, a water outlet, 10, a water outlet groove, 11, a water drainage groove, 12, a water inlet pipe, 13, a sedimentation tank main body, 14 and a mud drainage pipe.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following specific examples.
The equipment used in the examples was a center drive mud scraper.
Example 1
A method for treating wastewater by using a circular sedimentation tank with a mechanical sludge discharge device comprises the circular sedimentation tank with the mechanical sludge discharge device, wherein the circular sedimentation tank comprises a sedimentation tank main body 13, the sedimentation tank main body 13 is provided with the mechanical sludge discharge device, the mechanical sludge discharge device comprises a sludge scraper 6 positioned at the bottom of the sedimentation tank main body 13 and a motor 1 connected through a transmission shaft 3, and a reduction box 2 is also arranged below the motor 1; a mud-water separation device is further arranged at the part, located above the mud scraper 6, in the sedimentation tank main body 13, and the vertical distance between the mud-water separation device and the mud scraper 6 is 10000 mm; the mud-water separation device comprises a support frame 5, wherein a filler 4 is arranged on the support frame 5;
a water outlet groove 10 is formed in the side wall of the sedimentation tank main body 13, a drainage groove 11 is formed above the mud-water separation device and is connected with the water outlet groove 10, and a water outlet 9 is formed in the water outlet groove 10; the water outlet groove 10 is arranged on the inner side wall or the outer side wall of the sedimentation tank body 13; the drainage channel 11 consists of 8 drainage channel pipelines.
The sedimentation tank main body 13 further comprises a water inlet device, the water inlet device comprises a water inlet pipe 12, and the water inlet pipe 12 is connected with the mud-water separation device through the central cylinder 8.
The filler 4 is an inclined tube filler or an inclined plate filler, the inclination angle of the filler 4 is 60 degrees, and the vertical height of the filler 4 is 800 mm. The material of the filler is polyvinyl chloride.
The bottom of the sedimentation tank main body 13 is provided with a sludge collecting groove 7 for storing sludge collected by the sludge scraper 6; the sludge collecting groove 7 is provided with a sludge discharge pipe 14 for discharging sludge.
The method for treating wastewater comprises the following steps:
the waste water enters the central cylinder 8 through the water inlet pipe 12, is distributed to the mud-water separation device through the central cylinder 8, is subjected to mud-water separation in the mud-water separation device by the filler 4, clear water is collected to the water outlet groove 10 through the water discharge groove 11 and then is discharged through the water outlet 9, the separated sludge falls to the bottom of the sedimentation tank main body 13, the sludge is collected to the sludge collection groove 7 through the sludge scraper 6, and finally the sludge is discharged through the sludge discharge pipe 14 when the sedimentation tank with the mechanical sludge discharge device is used for waste water treatment, wherein the design value of the surface load of the sedimentation tank can reach 3 tons of water/square meter/day.
Example 2
As described in example 1, except that:
the filler 4 in the mud-water separation device is an inclined tube made of polypropylene, the inclination angle is set to be 75 degrees, and the vertical height of the filler 4 is 1500 mm.
Example 3
As described in example 1, except that:
the filler 4 in the mud-water separation device is an inclined tube made of glass fiber reinforced plastics, the inclination angle is set to be 60 degrees, and the vertical height of the filler 4 is 200 mm.
Comparative example 1
A common sedimentation tank with filler is generally square, muddy water enters the bottom of a filler separation area through one side or two sides, waste water is separated through the filler, collected through a water outlet groove and enters a water collecting groove, the waste water passes through a water outlet discharge system, sludge precipitated in a sedimentation area enters a plurality of sludge accumulating pits to be collected, and then the waste water is discharged out of the sedimentation tank through a sludge accumulating hopper. Because of being equipped with a plurality of long-pending mud hoppers in this shape sedimentation tank, because mud hopper advances mud volume and distributes unevenly, and the mud discharge of every mud hopper can't the accurate control, and continuous long-term operation causes the mud hopper to arrange mud unevenly easily, and some mud hoppers can seriously long-pending mud, cause the mud come-up, make the change of play water suspended solid great, can't satisfy the emission standard requirement.
Comparative example 2
A sedimentation tank with a sludge discharge device adopts a horizontal flow sedimentation tank, sludge water enters a sedimentation area through a water distribution device from one side or two sides, and after passing through a filler separation area, separated water is collected by a water outlet tank, enters a water collecting tank and is discharged through a water outlet. The mud that deposits is collected mud collecting bucket discharge system through the mud scraper, and this shape sedimentation tank adopts square design, and square sedimentation tank is because unilateral straight wall bears pressure, and sedimentation tank construction cost is higher, can't satisfy circular sedimentation tank transformation requirement.
Comparative example 3
The utility model provides a general sedimentation tank, muddy water enters into the sedimentation tank through the central island water distribution by the inlet tube, after the sedimentation tank dwell certain time, overflow through the peripheral play weir of sedimentation tank and get into the basin of discharging water and discharge through the delivery port, mud is discharged by bottom mud collecting hopper after the mud is collected through the mud scraper, because the overflow does not pass through filler intensive separation, the play water suspended solid is higher, can't satisfy discharge standard requirement, consequently, increase at the sedimentation tank rear end under the general condition and set up sand filtration system or other devices, in order to satisfy discharge standard requirement. The process has poor treatment effect, long flow, high management difficulty and effluent which can not meet the requirements of national standards.
Test examples
The wastewater treatment methods in example 1 and comparative examples 1 to 3 were each subjected to an effect test. After biochemical treatment, the wastewater to be treated is subjected to advanced oxidation reaction and then enters a sedimentation tank for sludge-water separation, after the wastewater is subjected to advanced oxidation dosing reaction, the concentration of suspended matters in the wastewater is 600mg/L, the tests are respectively carried out according to the methods of example 1 and comparative examples 1-3, and the test data are detailed in Table 1.
TABLE 1
| Item | Example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Before treatment, suspended matter mg/L | 600 | 600 | 600 | 600 |
| After treatment, the suspended matter mg/L of the effluent is | 12 | 35 | 26 | 50 |
As can be seen from Table 1, the effluent suspended matter of comparative example 1 is only 12mg/L, while the effluent suspended matters of comparative examples 1 to 3 are all above 25mg/L, which shows that the method adopted by the invention fully improves the precipitation efficiency of wastewater treatment, and greatly reduces the concentration of the effluent suspended matter, so that the effluent suspended matter reaches the national discharge standard.
Claims (10)
1. A method for treating wastewater by using a circular sedimentation tank with a mechanical sludge discharge device comprises the steps that the circular sedimentation tank with the mechanical sludge discharge device comprises a sedimentation tank main body, the sedimentation tank main body is provided with the mechanical sludge discharge device, and the mechanical sludge discharge device comprises a sludge scraper positioned at the bottom of the sedimentation tank main body and a motor connected through a transmission shaft; a mud-water separation device is further arranged at the part, above the mud scraper, in the sedimentation tank main body, and comprises a support frame, and a filler is arranged on the support frame;
a water outlet groove is formed in the side wall of the sedimentation tank body, a water drainage groove is formed above the mud-water separation device and is connected with the water outlet groove, and a water outlet is formed in the water outlet groove;
the sedimentation tank main body also comprises a water inlet device, the water inlet device comprises a water inlet pipe, and the water inlet pipe is connected with the mud-water separation device through a central cylinder;
the method for treating wastewater comprises the following steps:
the method comprises the following steps of enabling waste water to be treated to enter a central cylinder through a water inlet pipe, distributing the waste water to a mud-water separation device through the central cylinder, after mud-water separation is completed in the mud-water separation device through fillers, collecting clear water to a water outlet groove through a water discharge groove, discharging the clear water through a water outlet, enabling separated sludge to fall to the bottom of a sedimentation tank main body, and collecting and discharging the sludge through a sludge scraper.
2. The method for treating wastewater by using a circular sedimentation tank with a mechanical sludge discharge device according to claim 1, wherein the surface load design value of the sedimentation tank is 0.8-3.5 tons/m/day, and the suspended matter of the effluent is 5-25 mg/L.
3. The method of treating wastewater using a circular settling tank with a mechanical sludge discharge device as claimed in claim 1, wherein the packing is an inclined tube packing or an inclined plate packing.
4. The method for treating wastewater by using a circular sedimentation tank with a mechanical sludge discharge device according to claim 1, wherein the inclination angle of the filler is 45 to 78 degrees, and the vertical height of the filler is 200 to 1800 mm; further preferably, the material of the filler is selected from polypropylene, polyvinyl chloride or glass fiber reinforced plastic.
5. The method for treating wastewater by using a circular sedimentation tank with a mechanical sludge discharge device as claimed in claim 1, wherein a reduction box is further provided below the motor in the mechanical sludge discharge device.
6. The method of claim 1, wherein the outlet channel is disposed on an inner or outer sidewall of the main body of the sedimentation tank.
7. The method for treating wastewater by using a circular sedimentation tank with a mechanical sludge discharge device as claimed in claim 1, wherein the vertical distance between the sludge-water separation device and the sludge scraper is 200 to 30000 mm.
8. The method for treating wastewater by using a circular sedimentation tank with a mechanical sludge discharge device as claimed in claim 1, wherein a sludge collection tank is provided at the bottom of the sedimentation tank main body; the sludge collecting groove is provided with a sludge discharge pipe.
9. The method of treating wastewater using a circular settling tank with a mechanical sludge discharge device as claimed in claim 1, wherein the drainage channel is composed of a single drainage channel pipe or two or more drainage channel pipes.
10. The method for treating wastewater by using a circular sedimentation tank with a mechanical sludge discharge device as claimed in claim 9, wherein the drainage channel is composed of 4-10 drainage channel pipes.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113041666A (en) * | 2021-03-22 | 2021-06-29 | 山东环发科技开发有限公司 | Method for treating wastewater by utilizing composite efficient sedimentation tank with mechanical sludge discharge function |
| CN113041663A (en) * | 2021-03-22 | 2021-06-29 | 山东环发科技开发有限公司 | Method for treating wastewater by utilizing composite efficient sedimentation tank |
| 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 |
| CN117101201A (en) * | 2023-10-24 | 2023-11-24 | 国投瑞能(山东)环境集团有限公司 | Biological pond mud collection device |
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| CN113041666A (en) * | 2021-03-22 | 2021-06-29 | 山东环发科技开发有限公司 | Method for treating wastewater by utilizing composite efficient sedimentation tank with mechanical sludge discharge function |
| CN113041663A (en) * | 2021-03-22 | 2021-06-29 | 山东环发科技开发有限公司 | Method for treating wastewater by utilizing composite efficient sedimentation tank |
| 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 |
| CN117101201A (en) * | 2023-10-24 | 2023-11-24 | 国投瑞能(山东)环境集团有限公司 | Biological pond mud collection device |
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Application publication date: 20200306 |