CN113457231A - Washing method of ultra-light filter material filter tank - Google Patents
Washing method of ultra-light filter material filter tank Download PDFInfo
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- CN113457231A CN113457231A CN202110930288.2A CN202110930288A CN113457231A CN 113457231 A CN113457231 A CN 113457231A CN 202110930288 A CN202110930288 A CN 202110930288A CN 113457231 A CN113457231 A CN 113457231A
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- water
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- flushing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
- B01D24/4631—Counter-current flushing, e.g. by air
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- 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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Abstract
The invention discloses a washing method of an ultralight filter material filter tank. After valves on a raw water pipe and a clean water pipe of the ultra-light filter material filter tank are closed, the filter tank is washed by the following steps: (1) starting a blower and opening a valve on an air flushing pipe, wherein air passes through a filter material layer from bottom to top; (2) continuing air blasting and keeping the strength unchanged, opening a valve on a washing wastewater discharge pipe, and emptying water in the filter tank within 3-5 min; (3) stopping air blasting, starting a rinsing water pump, opening a valve on a rinsing water pipe, enabling rinsing water to flow through a filter material layer from top to bottom, rinsing the filter material, and gradually raising the water level in the filter; (4) and when the water level in the filter tank rises above the filter plate, keeping the water flushing strength unchanged, continuously flushing for 3-5 min, and finishing flushing. The method of the invention can obtain good washing effect on the filter material filter pool with small density, and has the advantages of simple and convenient operation, low water consumption and low operation power cost.
Description
Technical Field
The invention belongs to the technical field of research and development of water treatment devices, and particularly relates to a washing method of an ultralight filter material filter tank.
Background
The traditional quartz sand filter tank plays an important role in drinking water treatment, but has the following defects: (1) the construction and operation costs of the quartz sand filter tank are high because the quartz sand used as the filter material is expensive; (2) if a high-speed water flow backwashing mode is adopted, the whole filter layer can show an obvious hydraulic classification phenomenon after the flushing is finished, and the sewage interception capability of the filter layer can be greatly reduced; (3) even if the so-called 'homogeneous filter material' is relatively, the filter layer still has a certain degree of 'hydraulic classification' phenomenon, and the dirt intercepting capability of the whole filter layer is still relatively limited; (4) the specific gravity of the quartz sand is large, so that the resistance in washing is large, and the energy consumption is high.
In order to solve the problems, some experts focus on the research, development and application of the light filter material filter. The light filter material is a filter material with a specific gravity smaller than that of water, and mainly comprises foam filter beads, light diatomite ceramsite, ultra-light sludge ceramsite, polyvinyl formal suspension filter material and the like. At present, the light filter material filter is mainly researched and applied to the fields of sewage treatment and biological pretreatment of drinking water, and the research and the application in the field of conventional drinking water treatment are few.
The existing light filter material filter tank has an important defect that the back washing difficulty is high and the washing effect is poor. Because the light filter material is extruded below the filter plate under the buoyancy of water, the filter material is further extruded under the action of water flow when the upward flow is washed, and pollutants intercepted in the filter layer are not easy to remove. If downward flow flushing is adopted, great flushing intensity is needed, energy consumption is high, and water consumption is also high. The smaller the density of the filter material is, the larger the buoyancy force applied to the filter material in water is, and the larger the flushing difficulty is. The method for solving the problem mainly adopts a pulse backwashing mode, and comprises the following specific operation steps: firstly closing the water inlet valve and the aeration system, then opening the back-flushing air inlet valve, and inflating the air chamber for 5-6 min by the back-flushing fan, so as to discharge water in the air chamber, opening the air discharge pipe valve after an air cushion layer with a certain thickness is formed, instantly discharging air, rapidly replenishing the air chamber with the water at the upper part of the filter tank from top to bottom, scattering the compacted light filter material, and flushing the filter material. It can be seen that the operation procedure of the flushing mode is complex, the flushing time is limited, the flushing intensity is not easy to control, and the flushing effect is not ideal. While for ultra-light filter materials, which are much less dense than water, rinsing is more difficult. Because the density of the filter material is very small, the filter material is extruded together under the action of huge buoyancy in water, and pollutants adsorbed on the surface of the filter material and intercepted between the filter materials are difficult to wash out by the conventional washing method, thereby seriously influencing the subsequent filtering work of the filter chamber.
Disclosure of Invention
The invention aims to provide a washing method of an ultralight filter material filter tank, and aims to solve the problems that the existing washing mode is complex in operation procedure, limited in washing time, difficult to control in washing strength, unsatisfactory in washing effect and the like.
The invention is realized in this way, a washing method of ultra-light filter material filter pool, the ultra-light filter material filter pool includes the cell body, there are filter plates in the cell body, the cell body and filter plate are upper to be the clear water district, the cell body and filter plate under filter plate are the filtering layer that the ultra-light filter material piles up and locate at the water distribution district of filtering layer, the filter head of the said filter plate is distributed evenly; wherein, the water outlet section of the raw water pipe in the tank body is positioned at the bottom of the water distribution area, the water outlet section is in a pipe canal shape with an open upper part, the water inlet end of the raw water pipe is butted with the flushing wastewater discharge pipe outside the tank body, the air flushing section of the air flushing pipe is positioned at the bottom of the water distribution area and above the water outlet section of the raw water pipe, and air flushing holes are uniformly distributed on the air flushing section; the water inlet end of the clear water pipe is butted with the upper part in the clear water area, the water outlet end of the clear water pipe extends into the clear water tank, one end of the flushing water pipe is butted with the bottom in the clear water tank, and the other end of the flushing water pipe is butted with the upper part in the clear water area; a flushing water pump is arranged on the flushing water pipe, an air blower is arranged on the air flushing pipe, and valves are arranged on all the pipelines; after the valves on the raw water pipe and the clean water pipe are closed, the flushing method comprises the following steps:
(1) starting a blower and opening a valve on an air flushing pipe, wherein air passes through a filter material layer from bottom to top;
(2) continuing air blasting and keeping the strength unchanged, opening a valve on a washing wastewater discharge pipe, and emptying water in the filter tank within 3-5 min;
(3) stopping air blasting, starting a rinsing water pump, opening a valve on a rinsing water pipe, enabling rinsing water to flow through a filter material layer from top to bottom, rinsing the filter material, and gradually raising the water level in the filter;
(4) and when the water level in the filter tank rises above the filter plate, keeping the water flushing strength unchanged, continuously flushing for 3-5 min, and finishing flushing.
Preferably, the ultra-light filter material has a density of 15-20 kg/m3The polystyrene foam filter beads of (1).
Preferably, in the step (1), the air impact strength is 5-9L/s.m2The washing time is 1-3 min.
Preferably, in the step (3), the water impact strength is 4-8L/s.m2The water flushing time is 3-5 min.
The invention overcomes the defects of the prior art and provides a method for washing an ultralight filter material filter tank. The technical points of the method of the invention are as follows: (1) removing pollutants adhered to the surface of the filter material by adopting an air blast method, wherein the filter material can be violently vibrated and rotated by rising bubbles generated by air blast, and pollutants adsorbed on the surface of the filter material can be peeled off by violent friction among the filter materials; (2) the flushing wastewater in the tank is discharged by adopting an emptying method, and meanwhile, the whole filter material layer slides and becomes loose; in addition, in the emptying process, rising bubbles generated by air impact still promote the filter material to vibrate, rotate and rub with each other, so that the pollutants adsorbed on the surface of the filter material are peeled off; (3) the water is flushed downwards to rinse the filter material layer; the water from top to bottom can further enable the hardened and bonded filter materials to fall and become loose, gaps among the filter materials are enlarged, the filter materials can be rinsed more easily, and pollutants adsorbed on the surfaces of the filter materials are washed off and discharged; very importantly, before the water flushing, if the filter materials are not emptied, the filter materials are extruded below the filter plate under the action of strong buoyancy, gaps among the filter materials are small, and pollutants adsorbed on the surfaces of the filter materials and mixed in the middle of the filter material layers are difficult to flush out by the water flushing with ordinary strength.
Compared with the defects and shortcomings of the prior art, the invention has the following beneficial effects: the method of the invention is used for filtering materials with very low density (for example, the density is 15-20 kg/m)3Polystyrene foam filter beads) can obtain good washing effect, and has simple and convenient operation, low water consumption and low operation power cost.
Drawings
FIG. 1 is a schematic structural diagram of an ultralight filter material filter tank related to the method of the invention; wherein, 1, a raw water pipe; 2. a water distribution area; 3. a filtering layer; 4. a filter head; 5. filtering the plate; 6. a clear water pipe; 7. a clean water tank; 8. a blower; 9. an air blast pipe; 10. a water pump is flushed; 11. flushing the water pipe; 12. flushing the waste water discharge pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An ultra-light filter material filter tank is shown in figure 1 and comprises a tank body, wherein a filter plate 5 is arranged in the tank body, a clear water area is arranged in the tank body and above the filter plate 5, a filter layer 3 for accumulating ultra-light filter materials and a water distribution area 2 positioned below the filter layer 3 are arranged in the tank body and below the filter plate 5, and filter heads 4 are uniformly distributed on the filter plate 5; wherein, the water outlet section of the raw water pipe 1 in the tank body is positioned at the bottom of the water distribution area 2, the water outlet section is a pipe channel with an open upper part, the water inlet end of the raw water pipe 1 is butted with a flushing wastewater discharge pipe 12 outside the tank body, the air flushing section of the air flushing pipe 9 is positioned at the bottom of the water distribution area 2 and above the water outlet section of the raw water pipe 1, and air flushing holes are uniformly distributed on the air flushing section; the water inlet end of the clean water pipe 6 is butted with the upper part in the clean water area, the water outlet end extends into the clean water tank 7, one end of the flushing water pipe 11 is butted with the bottom in the clean water tank 7, and the other end is butted with the upper part in the clean water area; the flushing water pipe 11 is provided with a flushing water pump 10, the air flushing pipe 9 is provided with an air blower 8, and each pipeline is provided with a valve.
In the embodiment of the invention, the ultra-light filter material has the density of 15-20 kg/m3The polystyrene foam filter beads of (1).
When the ultra-light filter material filter tank is in a normal water purification working state, water to be treated enters the upper part of a filter plate 5 from a raw water pipe 1 through a water distribution area 2, a filter layer 3 and a filter head 4, and then enters a clean water tank 7 through a clean water pipe 6. At this time, the valves of the air purge pipe 9, the flush water pipe 11, and the flush wastewater discharge pipe 12 are closed, and the blower 8 and the flush water pump 10 are stopped.
When the filter chamber needs to be washed due to the interception of excessive pollutants, after the valves on the raw water pipe 1 and the clean water pipe 6 are closed, the invention provides a washing method of the ultra-light filter material filter chamber, which comprises the following steps:
(1) starting the blower 8 and opening the air blast pipe9, air passes through the filter material layer from bottom to top, the ultra-light filter material is vibrated, rotated and rubbed with each other under the influence of rising bubbles, pollutants adsorbed on the surface of the filter material can fall off, and the air impact strength at the stage is 5-9L/s.m2The washing time is 1-3 min;
(2) continuing air flushing and keeping the strength unchanged, opening a valve on the flushing wastewater discharge pipe 12, emptying water in the filter tank, and enabling the hardened and adhered filter materials to finally slide down under the action of gravity along with the reduction of the water level in the tank body, so that the whole filter material layer becomes loose, wherein the time of the stage is 3-5 min;
(3) stopping air blasting, starting a rinsing water pump 10, opening a valve on a rinsing water pipe 11, enabling rinsing water to flow through a filter material layer from top to bottom, rinsing the filter material, gradually raising the water level in the filter, and controlling the water blasting strength at the stage to be 4-8L/s.m2The time is 3-5 min;
(4) and when the water level in the filter tank rises above the filter plate, keeping the water flushing strength unchanged, continuously flushing for 3-5 min, and finishing flushing.
The method of the invention can obtain good washing effect on the filter material filter pool with small density, and has the advantages of simple and convenient operation, low water consumption and low operation power cost.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A washing method of an ultra-light filter material filter tank comprises a tank body, wherein a filter plate is arranged in the tank body, a clear water area is arranged in the tank body and above the filter plate, a filter layer for accumulating ultra-light filter materials and a water distribution area positioned below the filter layer are arranged in the tank body and below the filter plate, and filter heads are uniformly distributed on the filter plate; wherein, the water outlet section of the raw water pipe in the tank body is positioned at the bottom of the water distribution area, the water outlet section is in a pipe canal shape with an open upper part, the water inlet end of the raw water pipe is butted with the flushing wastewater discharge pipe outside the tank body, the air flushing section of the air flushing pipe is positioned at the bottom of the water distribution area and above the water outlet section of the raw water pipe, and air flushing holes are uniformly distributed on the air flushing section; the water inlet end of the clear water pipe is butted with the upper part in the clear water area, the water outlet end of the clear water pipe extends into the clear water tank, one end of the flushing water pipe is butted with the bottom in the clear water tank, and the other end of the flushing water pipe is butted with the upper part in the clear water area; a flushing water pump is arranged on the flushing water pipe, an air blower is arranged on the air flushing pipe, and valves are arranged on all the pipelines; the method is characterized in that after the valves on the raw water pipe and the clean water pipe are closed, the flushing method comprises the following steps:
(1) starting a blower and opening a valve on an air flushing pipe, wherein air passes through a filter material layer from bottom to top;
(2) continuing air blasting and keeping the strength unchanged, opening a valve on a washing wastewater discharge pipe, and emptying water in the filter tank within 3-5 min;
(3) stopping air blasting, starting a rinsing water pump, opening a valve on a rinsing water pipe, enabling rinsing water to flow through a filter material layer from top to bottom, rinsing the filter material, and gradually raising the water level in the filter;
(4) and when the water level in the filter tank rises above the filter plate, keeping the water flushing strength unchanged, continuously flushing for 3-5 min, and finishing flushing.
2. The method for washing a super light filter material filter tank according to claim 1, wherein the density of the super light filter material is 15 to 20kg/m3The polystyrene foam filter beads of (1).
3. The method for washing a filter with ultra-light filter material according to claim 1, wherein in the step (1), the air impact strength is 5 to 9L/s-m2The washing time is 1-3 min.
4. The method for washing a filter with ultra-light filter material according to claim 1, wherein in the step (3), the water impact strength is 4 to 8L/s-m2The water flushing time is 3-5 min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110930288.2A CN113457231B (en) | 2021-08-13 | 2021-08-13 | Washing method of ultra-light filter material filter tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110930288.2A CN113457231B (en) | 2021-08-13 | 2021-08-13 | Washing method of ultra-light filter material filter tank |
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| CN113457231A true CN113457231A (en) | 2021-10-01 |
| CN113457231B CN113457231B (en) | 2022-08-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115465945A (en) * | 2022-09-21 | 2022-12-13 | 徐州工程学院 | Filter medium series type membrane bioreactor and flushing method thereof |
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2021
- 2021-08-13 CN CN202110930288.2A patent/CN113457231B/en active Active
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| JPH10211404A (en) * | 1997-01-29 | 1998-08-11 | Shinko Pantec Co Ltd | Apparatus and method for filtration |
| CN202124515U (en) * | 2011-06-01 | 2012-01-25 | 董文艺 | Backflushing device of biological aerated filter for light filter materials |
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| EP3804830A1 (en) * | 2019-10-07 | 2021-04-14 | Ming-Chun Hu | Reversible washing, floating bed type reverse sewage treatment system and treatment method thereof |
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| CN115465945A (en) * | 2022-09-21 | 2022-12-13 | 徐州工程学院 | Filter medium series type membrane bioreactor and flushing method thereof |
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| CN113457231B (en) | 2022-08-26 |
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