CN113443707B - Reactor for enhancing stability of granular sludge - Google Patents
Reactor for enhancing stability of granular sludge Download PDFInfo
- Publication number
- CN113443707B CN113443707B CN202110883458.6A CN202110883458A CN113443707B CN 113443707 B CN113443707 B CN 113443707B CN 202110883458 A CN202110883458 A CN 202110883458A CN 113443707 B CN113443707 B CN 113443707B
- Authority
- CN
- China
- Prior art keywords
- reactor
- granular sludge
- water
- screen
- stability
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for enhancing the stability of granular sludge, and relates to the field of water pollution treatment. The invention is mainly characterized in that: an uneven screen which is perpendicular to the direction of water flow is arranged in a granular sludge forming area in the UASB reactor, the granular sludge formation is accelerated by utilizing hydraulic selective pressure, and the density of the granular sludge is increased. This inhomogeneous screen cloth can make the water distribution more even, avoids the blind spot, and increase hydraulic shear effect forms more compact granular sludge, and then avoids reactor load increase to lead to granular sludge disintegration and come-up, guarantees stable pollutant and gets rid of efficiency. When the load is further increased, the water outlet reflux switch is turned on, the water inlet peristaltic pump simultaneously sucks reflux water and sewage, and the peristaltic pump and the uneven screen mesh jointly act to further improve the flow velocity and strengthen the stability of the granular sludge.
Description
Technical Field
The invention belongs to the field of water pollution treatment, and provides a reactor for enhancing the stability of granular sludge and an application method thereof, which are mainly applied to removing nitrogen in high-concentration wastewater, solve the problem of granular sludge instability when the load is increased, and avoid reduction of removal efficiency caused by floating and disintegration of the granular sludge.
Background
The granular sludge technology is a novel wastewater biological treatment technology and has the advantages of good sedimentation performance, large biological retention amount, high treatment efficiency and the like. However, granular sludge is sensitive to environmental changes, and is prone to breaking, floating and the like during high-load operation, so that nitrogen removal efficiency is reduced, and therefore, some researchers develop researches on how to improve the stability of the granular sludge. At present, researches show that the formation of granular sludge in a reactor can be accelerated and the stability of the granular sludge can be improved by adding crystal nuclei, ions or specific bacteria into the reactor, stirring by gas, increasing hydraulic shear and the like.
The invention aims to increase hydraulic selective pressure by changing the internal structure of a reactor on the premise of not increasing added substances and equipment, accelerate the formation of more compact granular sludge and improve the stability of the granular sludge.
Disclosure of Invention
In order to solve the problems, the invention provides a method for enhancing the stability of granular sludge, which is provided with an uneven screen to ensure that water is uniformly distributed in a reactor without dead zones; the hydraulic shearing speed is increased, the rapid growth of microorganisms is inhibited, more compact granular sludge can be formed, the instability of the granular sludge under a high-load condition is avoided, the effluent quality is improved, and the engineering cost is reduced.
The technical scheme of the invention is as follows: a reaction device for enhancing the stability of granular sludge comprises a reactor main body, a water outlet return pipe, a non-uniform screen and a three-phase separator; the reactor main body is a cylinder, the lower part of the reactor main body is a cone frustum, the bottom of the reactor main body is connected with a water inlet, flocculent sludge is inoculated at the bottom of the reactor, and sewage and backflow water are pumped into the reactor by using a water inlet pump; water flows through an uneven screen which is arranged at the lower part of the cylinder of the reactor main body from bottom to top and is vertical to the water flow direction, the uneven screen is arranged in a granular sludge forming area, and the uneven screen is connected to the inner side of the reactor main body; then, the mud-water mixture passes through the three-phase separator, and granular mud, water and gas are discharged from a mud discharge port, a water outlet and an exhaust port respectively; the top of the reactor main body is provided with a water outlet, and supernatant is discharged from the water outlet and a water outlet return pipe.
A circular sieve hole is formed in the central circular area of the non-uniform sieve, and the diameter of the central circular area of the non-uniform sieve is 1.1-1.2 times of the diameter of the water inlet; fan-shaped sieve holes are arranged on the periphery of the circular sieve holes, the diameter of each circular sieve hole is larger than the short arc length of each fan-shaped sieve hole, water flow on the cross section of the reactor is uniformly distributed, and a dead zone is prevented from being formed inside the reactor; fan-shaped sieve mesh periphery sets up square sieve mesh the square sieve mesh diameter of inhomogeneous screen cloth is used for ripe mud to fall back extremely the reactor bottom, according to the actual quality of water condition, the great square sieve mesh diameter of maximize design avoids great granule mud to form the jam.
When the nitrogen load or anaerobic load of the inlet water of the reactor is less than 3 Kg/(m)3When d), the water outlet return pipe is not opened, and the hydraulic shearing force in the reactor can be raised to a proper value by the uneven screen;
when the nitrogen load or anaerobic load of the inlet water of the reactor is more than 3 Kg/(m)3D), opening a water outlet return pipe, adjusting the flow of the water outlet return pipe according to actual needs, adjusting the flow rate of a water inlet of the reactor by using a water inlet peristaltic pump, and increasing the hydraulic shearing force in the reactor to a proper value under the combined action of the uneven screen and the peristaltic pump.
The invention is further improved as follows: install inhomogeneous screen cloth in UASB reactor, make the interior water distribution of reactor even, simultaneously, increase water conservancy selective pressure makes the granule mud density that forms bigger, avoids the microorganism too fast to increase when the high load operation, leads to the granule come-up and disintegrates even.
The invention is characterized in that: the method has the advantages that no extra medicine and adding equipment are added, the internal components are added to optimize the flow field in the reactor, so that the water distribution is uniform without dead zones, the hydraulic shearing speed is increased, more compact granular sludge is formed, the granular sludge instability phenomenon under the high-load operation condition is solved, the effluent quality is improved, and the engineering cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a reactor configuration for enhancing the stability of granular sludge.
Figure 2 is a top view of a non-uniform screen.
FIG. 3 is a UASB reactor grid diagram.
FIG. 4 is a UASB reactor grid diagram in accordance with the present invention.
FIG. 5 is a UASB reactor internal flow field profile.
FIG. 6 is a UASB reactor internal flow field profile according to the present invention.
Reference numerals
FIG. 1-reactor body; 2-a water inlet pump; 3-water outlet; 4-a sludge discharge port; 5-a water outlet return pipe; 6-a three-phase separator; 7-an exhaust port; 8-a non-uniform screen; 9-circular sieve pores; 10-sector sieve pores; 11-square mesh.
Detailed Description
The invention will be further illustrated by way of example in the following description, with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of a reactor configuration for enhancing the stability of granular sludge.
Figure 2 is a top view of a non-uniform screen.
A wastewater biological treatment reactor is built as shown in figures 1 and 2, and comprises a reactor main body 1, a water inlet pump 2, a water outlet 3, a sludge discharge port 4, a water outlet return pipe 5, a three-phase separator 6, an exhaust port 7 and an uneven screen 8. Firstly, flocculent sludge is added to the bottom in the reactor. Then, waste water is introduced into the reactor, and when the volume load of the nitrogen load of the inlet water or the anaerobic load is less than 3 Kg/(m)3When d), the water outlet return pipe is not opened, and sewage is pumped into the reactor from the bottom of the reactor by using the water inlet pump 2; when the nitrogen load or anaerobic load of the inlet water is more than 3 Kg/(m)3D), opening a water outlet return pipe, wherein the flow of the water outlet return pipe is 10-200% of the flow of the original sewage, pumping the return water and the sewage into the reactor by a water inlet pump, and increasing the hydraulic shearing force in the reactor to an optimal value to control the density of the granular sludge in the formation area. Water flows through the circular and fan-shaped sieve pores of the uneven screen 8 from bottom to top, mud-water mixture enters the three-phase separator 6 to realize the separation of granular sludge, gas and clear water, the gas is discharged from the gas outlet 7, the granular sludge falls back to the bottom of the reactor through the square sieve pores on the outer edge of the uneven screen, excessive residual sludge is discharged from the reactor through the sludge discharge port 4, and supernatant is discharged from the reactor and recycled through the water discharge port 3 and the water outlet backflow pipe 5 respectively.
Example 1
Fluid mechanics (CFD) software Fluent is used for respectively simulating the flow field distribution in the UASB reactor without the non-uniform screen member and the UASB reactor of the invention, a three-dimensional solid model is established by using Solidwork, the meshes of the reactor are divided and processed by using ICEM, and the geometrical meshes of the UASB reactor without the non-uniform screen member and the UASB reactor of the invention are respectively shown in figures 3 and 4. The water inlet is a flow velocity inlet, the inflow flow velocity is 2m/h, the outlet is a pressure outlet, the flow field distribution in the UASB reactor without the non-uniform screen member and the UASB reactor of the invention are respectively shown in figures 5 and 6, the flow field distribution in the UASB reactor of the invention is more uniform, no dead zone is basically formed, the hydraulic selective pressure is increased, the more compact granular sludge is formed, and the stability of the granular sludge is increased.
Example 2
Treating nitrate wastewater by adopting a common UASB reactor and the UASB reactor of the invention, and adding flocculent sludge into the reactor before water inlet to ensure that the sludge concentration reaches 8 g/L; then, nitrate wastewater is pumped into the reactor, methanol is used as a carbon source, and the volume load of nitrate nitrogen is 1 Kg/(m)3D) the reactor is continuously fed with water.
After the operation for 23 days, granular sludge is not formed in the common UASB reactor, and the sludge concentration is increased to 14.4 g/L; flocculent sludge in the reactor is converted into granular sludge, and the concentration of the sludge is increased to 22.3 g/L.
When the reactor is continuously operated for 42 days, granular sludge is formed in the common UASB reactor, and the sludge concentration is increased to 21.5 g/L; the concentration of the granular sludge in the reactor is kept at 24 g/L.
On the 43 th to 46 th days, the nitrate nitrogen inflow load is gradually increased to 3 Kg/(m)3D). The sludge concentration in the common UASB reactor is rapidly reduced to 18.6g/L, the nitrate nitrogen removal rate is finally reduced to 85 percent, and the phenomena of loose and floating structure and increase of particle size of granular sludge are observed; the concentration of the granular sludge in the reactor is stabilized at 23.5g/L, the nitrate nitrogen removal effect is maintained at more than 95%, the particle size is clear, and the particle shape is observed to be unchanged.
On 47-50 days, the effluent reflux pipe of the reactor is opened to gradually increase the nitrate nitrogen inflow load to 6 Kg/(m)3D). The sludge concentration in the common UASB reactor is reduced to 12 g/L, and the phenomena of disintegration and loss of granular sludge are observed; the concentration of the granular sludge in the reactor is slightly reduced to 22g/L, the nitrate nitrogen removal effect is still kept above 94%, and the granular form is observed to have no obvious change.
Table 1 example 2 operational monitoring data
In conclusion, the results of the embodiment 1 and the embodiment 2 show that the UASB reactor is added with the uneven screen mesh internal member, so that the flow field distribution in the reactor is more uniform, the dead zone is reduced, the hydraulic selective pressure is increased, more compact granular sludge is formed, and the phenomenon that the microorganism grows too fast when the load is increased, so that the particles float upwards and even disintegrate, and finally the reactor collapses is avoided.
Claims (5)
1. A reactor for enhancing the stability of granular sludge is characterized by comprising a reactor main body (1), an effluent return pipe (5), a three-phase separator (6) and an uneven screen (8); the reactor main body (1) is a cylinder, and sewage and backflow water are pumped from the bottom of the reactor by using the water inlet pump (2); sewage flows through an uneven screen (8) which is arranged in a granular sludge forming area of the reactor main body (1) and is vertical to the water flow direction from bottom to top, and the uneven screen (8) is connected to the inner side of the reactor main body (1); after sewage flows through the uneven screen (8), the mud-water mixture passes through a three-phase separator (6) arranged at the upper part and the lower part of the reactor main body (1), and then clear water is discharged out of the reactor from the water outlet (3) and the water outlet return pipe (5) and recycled; a circular sieve hole (9) is formed in the central circular area of the uneven screen (8), fan-shaped sieve holes (10) are formed in the periphery of the circular sieve hole (9), and square sieve holes (11) are formed in the periphery of the fan-shaped sieve holes (10); the diameter of the circular sieve holes (9) is 12-180mm, the short arc length of the fan-shaped sieve holes (10) is 8-150mm, and the diameter of the circular sieve holes (9) is larger than the short arc length of the fan-shaped sieve holes (10).
2. The reactor for enhancing the stability of granular sludge according to claim 1, wherein the diameter of the central circular area of the non-uniform screen (8) is 1.1 to 1.2 times of the diameter of the bottom water inlet, the angle between the fan-shaped screen holes (10) and the horizontal direction is 0 to 60 degrees, and the uniform flow velocity distribution on the horizontal section after the water flow passes through the non-uniform screen (8) is maintained.
3. A reactor for enhancing the stability of granular sludge according to claim 1, wherein the diameter of the square sieve holes (11) is 25-400mm, and the matured granular sludge falls back to the bottom of the reactor through the square sieve holes (11) and is discharged out of the reactor main body (1) through the sludge discharge port (4).
4. A reactor for enhancing the stability of granular sludge according to claim 1, wherein the reactor body (1) has a height to diameter ratio of 2-10.
5. The method of claim 1 for using a reactor for enhancing the stability of granular sludge, wherein the reactor comprises: when the nitrogen load or anaerobic load of the reactor is less than 3 Kg/(m)3D), the water outlet return pipe (5) is in a closed state, and the flow velocity is increased only by using the uneven screen (8); when the nitrogen load or anaerobic load of the reactor is more than 3 Kg/(m)3D), the water outlet return pipe (5) is in an open state, the flow of the water outlet return pipe (5) is 10-200% of the flow of the original sewage, the sewage and the return water enter the reactor through the water inlet pump (2), and the flow velocity is increased by using the non-uniform screen (8) and the water inlet pump (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110883458.6A CN113443707B (en) | 2021-08-03 | 2021-08-03 | Reactor for enhancing stability of granular sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110883458.6A CN113443707B (en) | 2021-08-03 | 2021-08-03 | Reactor for enhancing stability of granular sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113443707A CN113443707A (en) | 2021-09-28 |
| CN113443707B true CN113443707B (en) | 2022-03-25 |
Family
ID=77818100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110883458.6A Active CN113443707B (en) | 2021-08-03 | 2021-08-03 | Reactor for enhancing stability of granular sludge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113443707B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007078195A1 (en) * | 2006-01-05 | 2007-07-12 | Biothane Systems International B.V. | Process and reactor for anaerobic waste water purification |
| CN101767875A (en) * | 2010-02-05 | 2010-07-07 | 浙江大学 | Double-circulation biological membrane anaerobic ammonia oxidation reactor |
| CN105129975A (en) * | 2015-09-09 | 2015-12-09 | 浙江省城乡规划设计研究院 | Built-in screen type aerobic granular sludge reactor and sewage treatment method thereof |
| CN105923760A (en) * | 2016-06-16 | 2016-09-07 | 北京工业大学 | Apparatus and operation method for quickly forming anammox particles using quorum sensing mechanism |
| WO2020205834A1 (en) * | 2019-04-01 | 2020-10-08 | Carollo Engineers, Inc. | Flow through aerobic granular sludge system and method |
-
2021
- 2021-08-03 CN CN202110883458.6A patent/CN113443707B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007078195A1 (en) * | 2006-01-05 | 2007-07-12 | Biothane Systems International B.V. | Process and reactor for anaerobic waste water purification |
| CN101767875A (en) * | 2010-02-05 | 2010-07-07 | 浙江大学 | Double-circulation biological membrane anaerobic ammonia oxidation reactor |
| CN105129975A (en) * | 2015-09-09 | 2015-12-09 | 浙江省城乡规划设计研究院 | Built-in screen type aerobic granular sludge reactor and sewage treatment method thereof |
| CN105923760A (en) * | 2016-06-16 | 2016-09-07 | 北京工业大学 | Apparatus and operation method for quickly forming anammox particles using quorum sensing mechanism |
| WO2020205834A1 (en) * | 2019-04-01 | 2020-10-08 | Carollo Engineers, Inc. | Flow through aerobic granular sludge system and method |
Non-Patent Citations (1)
| Title |
|---|
| 颗粒污泥沉降动力学模型研究;周丹等;《环境污染与防治》;20080331;第30卷(第3期);第36-38页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113443707A (en) | 2021-09-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107601656B (en) | Device for rapidly culturing aerobic granular sludge secondary flow air-stripping fluidized bed by granulating granular sludge | |
| CN207632576U (en) | Multistage sloping plate coagulative precipitation device | |
| CN110526395B (en) | Rotational flow anaerobic reactor for wastewater treatment system | |
| CN113443707B (en) | Reactor for enhancing stability of granular sludge | |
| CN108455727B (en) | Internal circulation anaerobic reactor for enhancing sludge granulation | |
| CN211311153U (en) | Non-uniform flow field effect generating device for industrial wastewater treatment | |
| CN107973399B (en) | High-efficient three-phase separation system | |
| CN115784435B (en) | Reinforced circulation micro-anaerobic reaction system | |
| CN105198080A (en) | Anaerobic particle sludge rapid culture method suitable for oil refining and chemical engineering wastewater treatment | |
| CN105523615A (en) | Multistage intensified catalytic oxidation, reduction and aeration internal electrolysis reactor and application thereof | |
| CN215480383U (en) | Equipment for treating chemical wastewater by using microorganism sludge particles | |
| CN204162573U (en) | A kind of Sewage treatment systems | |
| CN209824860U (en) | Rice field circulating water high density farming systems | |
| CN210176568U (en) | Anaerobic ammoxidation circulating reactor | |
| CN105174449A (en) | Up-flow anaerobic sludge blanket reactor of improved structure | |
| CN201276467Y (en) | High-efficiency sewage treatment circulating device | |
| CN211338962U (en) | Novel anaerobic internal circulation reactor | |
| CN111072142A (en) | Anaerobic reaction system for treating livestock and poultry breeding sewage or high-concentration organic wastewater | |
| CN205007660U (en) | A top is circle pipe chute mechanical stirring clarification membrane down for advanced waste treatment | |
| CN212609849U (en) | In-situ water quality circulating purifier | |
| CN205382071U (en) | Soyfood effluent treatment plant | |
| CN217947837U (en) | Ozone catalytic oxidation treatment device for pig-raising wastewater advanced treatment process | |
| CN213012497U (en) | River course sewage microorganism intensive treatment system | |
| CN113184981B (en) | Precipitation device capable of adjusting CFR (circulating fluidized bed) by converting SBR (styrene butadiene rubber) easy to disassemble and assemble into sludge | |
| CN219363387U (en) | Algae fungus mud fast granulation reactor based on whirl is selected separately |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |