CN111606411A - Efficient, uniform and rapid water and gas distribution backwashing system of biological filter and using method - Google Patents
Efficient, uniform and rapid water and gas distribution backwashing system of biological filter and using method Download PDFInfo
- Publication number
- CN111606411A CN111606411A CN202010603417.2A CN202010603417A CN111606411A CN 111606411 A CN111606411 A CN 111606411A CN 202010603417 A CN202010603417 A CN 202010603417A CN 111606411 A CN111606411 A CN 111606411A
- Authority
- CN
- China
- Prior art keywords
- filter
- water
- backwashing
- air
- biological filter
- 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.)
- Granted
Links
- 238000009826 distribution Methods 0.000 title claims abstract description 161
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 152
- 238000011001 backwashing Methods 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 45
- 238000009423 ventilation Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 19
- 239000007789 gas Substances 0.000 claims description 92
- 238000011010 flushing procedure Methods 0.000 claims description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 10
- 239000011574 phosphorus Substances 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 5
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 230000000740 bleeding effect Effects 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 238000012217 deletion Methods 0.000 claims description 3
- 230000037430 deletion Effects 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000002861 polymer material Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 claims description 3
- 230000007774 longterm Effects 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- 238000005507 spraying Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 8
- 239000010865 sewage Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 238000007726 management method Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- 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
Abstract
The invention discloses a high-efficiency uniform and rapid water and gas distribution backwashing system of a biological filter, which comprises a biological filter water and gas distribution chamber body, a filter plate, a filter head, a backwashing gas distribution main pipe, backwashing gas distribution branch pipes, spaced filter beams, multi-lattice filter beams, a ventilation and gas distribution pipe, a pressure sensor, a backwashing water system, a backwashing gas system and an exhaust system; by adopting the treatment method, the problems that the water distribution and the air distribution are uneven and the hysteresis quality is high in the backwashing process of the biological filter, and the residual air cushion layer cannot be discharged out of the system after the backwashing is finished, so that continuous bubbles appear at multiple positions of the filter for a long time, the sense is influenced, and the pollutant removal efficiency is reduced are thoroughly solved; the system solves a series of operation management problems of filter material hardening, high operation pressure, unsmooth water passing, backwashing material spraying and material running and the like caused by insufficient local backwashing strength caused by uneven backwashing water distribution and air distribution of the biological filter tank from the source, and has great popularization and application values for the technical field of the biological filter tank.
Description
Technical Field
The invention belongs to the technical field of water pollution treatment, and particularly relates to a high-efficiency uniform and rapid water and gas distribution backwashing system of a biological filter and a using method thereof.
Background
In recent years, with the increasingly prominent water pollution problem in China, the improvement of the discharge standard of urban sewage treatment tends to be great, and the sewage treatment technology by the biofilm method is widely researched and applied, wherein the biofilter is widely applied to the field of sewage deep treatment by virtue of the advantages of small occupied area, low operating cost, small capital investment, high treatment load, convenient operation and management, good treatment effect, no need of sludge discharge and the like.
The existing biological filter generally adopts a 'precipitation level + air water combination method' to carry out periodic backwashing, and suspended matters intercepted by the filter and an aged and fallen biological membrane are discharged out of a system so as to ensure the permeability of filter materials in the filter, but the biological filter still has a plurality of problems in operation, such as: (1) in the backwashing process of the filter, the phenomenon of uneven water distribution and air distribution, overlarge backwashing strength of a local area and even strong material spraying frequently occurs, and the phenomenon of insufficient backwashing strength of the local area and even no air is generated; in the back flushing process of some filter tanks, the water distribution and the gas distribution have hysteresis, the local area close to the gas inlet end distributes water and gas in advance, even the strength is far beyond the designed strength, and the water distribution and the gas distribution in other areas have obvious hysteresis and extremely uneven strength; (2) after the backwashing of the filter tank is finished, continuous bubbles often appear at a plurality of positions, the duration is long, the bubbles cannot be discharged through an exhaust system, the operation attractiveness of the filter tank is seriously influenced, and particularly in a nitrogen removal or denitrification biological filter tank system, the pollutant removal efficiency of a denitrification filter tank is reduced due to the continuous bubbles; (3) because the backwashing water distribution and air distribution are uneven, the backwashing strength of the local area of the filter tank is insufficient, the local backwashing strength is too high, the problems of hardening, material spraying, filter material loss, mixed bed of a supporting layer and a filter material layer and the like of a filter material of the biological filter tank are easily caused in the past, serious production accidents are caused even when the filter plate is turned over, the daily production operation is tired, and the problems of the current situation are thoroughly solved by an efficient uniform and rapid air distribution backwashing system and a using method of the biological filter tank.
Disclosure of Invention
The invention aims to solve the problems and provides a high-efficiency uniform and rapid water and gas distribution backwashing system of a biological filter and a using method thereof so as to break through the problems encountered at present.
The invention specifically comprises the following contents:
a high-efficiency uniform and rapid water and gas distribution backwashing system of a biological filter consists of a biological filter water and gas distribution chamber body, a filter plate, a filter head, a backwashing gas distribution main pipe, a backwashing gas distribution branch pipe, spaced filter beams, a plurality of filter beam spaces, a ventilating and gas distributing device, a pressure sensor, a backwashing water system, a backwashing gas washing system and an exhaust system; the filter plate of the water distribution and air distribution chamber body is divided into a plurality of filter beams by the lower spacing filter beam; the filter head is arranged on the filter plate at the upper part of the multi-lattice filter beam; the pressure sensor is positioned below the filter plate; the backwashing water system is connected below the filter plate in the water distribution and air distribution chamber body; the back-washing gas distribution main pipe is connected with a plurality of back-washing gas distribution branch pipes, and outlets of the back-washing gas distribution branch pipes are respectively connected in the spaces among the single-lattice filter beams; the interval filter beams among the multi-lattice filter beams are communicated through a ventilation and gas distribution device with uniform elevation and uniform fixation, and the ventilation and gas distribution device is positioned at the top of the interval filter beams and below the filter plate; the exhaust system is located below the filter plate.
And at least 2 filter beams are arranged among the multi-grid filter beams.
The bottom of the backwash air distribution branch pipe extends to 1/5-4/5 of the backwash air distribution main pipe, and the top of the backwash air distribution branch pipe extends to 2-80mm below the filter plate.
The distance between the air ventilation and distribution devices in the spaced filter beams is 800mm, and the distance between the center of the air ventilation and distribution devices and the top surface of the filter beams is 5-100 mm.
The backwash air distribution main pipe and the backwash air distribution branch pipe are made of UPVC materials, carbon steel materials, stainless steel materials, concrete materials, plastic materials, high polymer materials, FRPP materials and other corrosion-resistant materials.
The structure form of the biological filter is an upward flow biological filter or a downward flow biological filter; the oxygen supply type of the biological filter can be an aerobic biological filter, an anoxic biological filter or an anaerobic biological filter; the function type of the biological filter can be a nitrification biological filter, a nitrogen deletion biological filter, a denitrification biological filter, a carbon removal nitrification biological filter or a phosphorus removal biological filter.
The filter head of the biological filter is a long-handle filter head, a short-handle filter head, an adjustable filter head or a detachable filter head; the ventilation and air distribution device is a communicating pipe or a communicating hole, and the shape of the pipe or the hole of the communicating pipe or the communicating hole is round, square or irregular.
The use method of the high-efficiency uniform and rapid water and gas distribution backwashing system of the biological filter comprises the following steps:
(1) before backwashing: the pressure sensor is used for measuring and reading the resistance value of the biological filter;
(2) air flushing: the backwashing gas enters the backwashing gas distribution branch pipes through the backwashing gas distribution main pipe and rapidly enters among the multiple filter beams in the water and gas distribution chamber of the biological filter to sequentially form air cushion layers with different thicknesses, the air cushion layers with different thicknesses among the multiple filter beams are communicated through a ventilation and gas distribution device with uniform height in the top of the interval filter beam, and an integral air cushion layer with uniform thickness is rapidly formed at the bottom of the filter plate of the water and gas distribution chamber and uniformly gas-washes the biological filter through the filter head, so that the condition that the biological filter is uniformly backwashed or excessively washed due to nonuniform gas distribution is avoided, and the abnormal conditions of hardened filter materials, sprayed materials, high water passing pressure and the like caused by insufficient long-term backwashing in a local area are avoided;
(3) air-water combined backwashing: keeping the starting process of the air backwashing system, enabling backwashing water to enter the water distribution and air distribution chamber of the biological filter through the backwashing water system, gradually rising through the bottom of the water distribution and air distribution chamber of the biological filter due to the fact that the specific gravity of water is larger than that of air, and gradually squeezing the air cushion layer among the multi-grid filter beams, so that air-water combined backwashing on the biological filter is formed through the filter head. Because of the air distribution device with uniform height which is pre-embedded at the top of the spacing filter beam (the bottom of the filter plate), the air cushion layer with reduced thickness can still keep uniform thickness under the action of backwash water pressure, thereby ensuring uniform water and air distribution in the air-water combined backwash stage of the biological filter, avoiding abnormal conditions of uneven backwash in the local area of the filter, overlarge local excessive backwash strength and the like, and ensuring that the filter material of the biological filter always keeps smooth and high-efficiency operation;
(4) rinsing with water: stopping the back flushing gas system, and carrying out a rinsing process of an independent back flushing water system;
(5) air bleeding: and stopping the rinsing process of the backwashing water system, opening the exhaust system, and quickly and thoroughly discharging the gas in the spaces among the multi-lattice filter beams out of the water and gas distribution chamber through the exhaust system by virtue of the air cushion layer remained at the bottom of the filter plate through the ventilation and gas distribution device with the uniform elevation at the top of the spaced filter beams under the action of gravity extrusion of water. The uniformity of water distribution of the normal operation of the biological filter after backwashing is ensured, and meanwhile, the long-time continuous bubble connection in the local area of the filter, which is not completely caused by the residual air cushion layer discharge system at the bottom of the filter plate, is avoided, and the problems of poor water outlet sense, large water inlet resistance and poor nitrogen and carbon removal and phosphorus removal of the biological filter, which are caused by the long-time continuous bubble connection, are solved.
The back washing system can adopt a back washing program of 'air washing + air-water combined back washing + water rinsing' or a back washing program of 'water level reduction + air washing + air-water combined back washing + water rinsing'.
And the flow velocity of the cross section in the filter rod at the lower end of each filter head is not less than 0.1m/s during the water level reduction backwashing.
The invention thoroughly solves the problems of uneven water and air distribution during the backwashing of the biological filter, water and air distribution hysteresis in the backwashing process of the biological filter, and low efficiency of removing pollutants caused by the influence of continuous bubbles at multiple positions of the filter due to the fact that a residual air cushion layer cannot be discharged out of a system after the backwashing is finished; the invention solves a series of operation management problems of filter material hardening, high operation pressure, unsmooth water passing, backwashing material spraying and material running and the like caused by insufficient local backwashing strength caused by uneven backwashing water distribution and air distribution of the biological filter from the source,
has great popularization and application value in the technical field of biological filter.
Drawings
FIG. 1 is a schematic sectional structure view of a high-efficiency uniform and rapid water and gas distribution backwashing system of a biological filter.
FIG. 2 is a schematic diagram of the top view structure of the lower part of the filter plate of the high-efficiency uniform and rapid water and gas distribution back flush system of the biofilter.
Wherein: a biological filter 0, a water distribution and air distribution chamber body 1 of the biological filter; a filter plate 2; a filter head 3; a back-flushing gas distribution main pipe 4; back flushing the gas distribution branch pipe 5; a spacing filter beam 6; a multi-grid filter beam room 7; a ventilation and gas distribution device 8; a pressure sensor 9; a backwash water system 10; a recoil gas system 11; an exhaust system 12.
Detailed Description
The invention is further described with reference to fig. 1 and 2:
a high-efficiency uniform and rapid water and gas distribution backwashing system of a biological filter 0 is composed of a biological filter water and gas distribution chamber body 1, filter plates 2, filter heads 3, a backwashing gas distribution main pipe 4, backwashing gas distribution branch pipes 5, spacing filter beams 6, multi-lattice filter beam spaces 7, a ventilation and gas distribution device 8, a pressure sensor 9, a backwashing water system 10, a backwashing gas system 11 and an exhaust system 12; the filter plate 2 of the water distribution and air distribution chamber body 1 is divided into a multi-grid filter beam room 7 by a lower spacing filter beam 6; the filter head 3 is arranged on the filter plate 2 at the upper part of the multi-grid filter beam room 6; the pressure sensor 9 is positioned below the filter plate 2; the backwashing water system 11 is connected below the filter plate 2 in the water distribution and air distribution chamber body 1; the back-flushing gas distribution main pipe 4 is connected with a plurality of back-flushing gas distribution branch pipes 5, and outlets of the back-flushing gas distribution branch pipes 5 are respectively connected into the single-lattice filter beam spaces 6; the interval filter beams 6 among the multi-lattice filter beams 7 are communicated through air-ventilating and air-distributing devices 8 which are uniformly fixed at uniform elevations, and the air-ventilating and air-distributing devices 8 are positioned at the tops of the interval filter beams 6 and below the filter plates 2; the exhaust system 12 is located below the filter sheet 2.
The multi-grid filter beam space 7 is at least 2 grid filter beam spaces.
The bottom of the backwash air distribution branch pipe 5 extends to the backwash air distribution main pipe 41/5-4/5, and the top of the backwash air distribution branch pipe 5 extends to the position 2-80mm below the filter plate 2.
The distance between the ventilation and air distribution devices 8 in the spaced filter beams 6 is 100-800mm, and the distance between the centers of the ventilation and air distribution devices 8 and the top surfaces of the filter beams 6 is 5-100 mm.
The backwash air distribution main pipe 4 and the backwash air distribution branch pipe 5 are made of UPVC materials, carbon steel materials, stainless steel materials, concrete materials, plastic materials, high polymer materials, FRPP materials and other corrosion-resistant materials.
The structure form of the biological filter 0 is an upward flow biological filter or a downward flow biological filter; the oxygen supply type of the biological filter can be an aerobic biological filter, an anoxic biological filter or an anaerobic biological filter; the function type of the biological filter can be a nitrification biological filter, a nitrogen deletion biological filter, a denitrification biological filter, a carbon removal nitrification biological filter or a phosphorus removal biological filter.
The filter head of the biological filter 0 is a long-handle filter head, a short-handle filter head, an adjustable filter head or a detachable filter head; the ventilation and air distribution device 8 is a communicating pipe or a communicating hole, and the shape of the pipe or the hole of the communicating pipe or the communicating hole is round, square or irregular.
The use method of the high-efficiency uniform and rapid water and gas distribution backwashing system of the biological filter 0 comprises the following steps:
(1) before backwashing: the pressure sensor 9 is used for measuring and reading the resistance value of the biological filter 0;
(2) air flushing: backflushing gas respectively enters the backflushing gas distribution branch pipes 5 through the backflushing gas distribution main pipe 4, and rapidly enters the multi-grid filter beam spaces 7 in the water and gas distribution chamber 1 of the biological filter 0, so that air cushion layers with different thicknesses are formed in sequence, the air cushion layers with different thicknesses among the multi-grid filter beam spaces 7 are communicated through the ventilation and gas distribution device 8 with uniform height in the top of the separation filter beam 6, an integral air cushion layer with uniform thickness is rapidly formed at the bottom of the filter plate 2 of the water and gas distribution chamber 1, and the biological filter 0 is uniformly gas-washed through the filter head 3, so that the condition that the backflushing of the biological filter 0 is uniform or excessively washed due to nonuniform gas distribution is avoided, and the conditions that the filter material is hardened, the material is sprayed, the water passing pressure is high and;
(3) air-water combined backwashing: keeping the starting process of the back flushing air system, enabling the back flushing water to enter the water distribution and air distribution chamber 1 of the biological filter 0 through the back flushing water system 10, gradually rising through the bottom of the water distribution and air distribution chamber 1 of the biological filter due to the fact that the specific gravity of water is larger than that of air, gradually squeezing an air cushion layer between the multi-grid filter beams 7, and accordingly forming air-water combined back flushing on the biological filter 0 through the filter head 3. Because of the air distribution device 8 with uniform height which is pre-buried at the top of the spacing filter beam 6 (at the bottom of the filter plate), the air cushion layer with reduced thickness can still keep uniform thickness under the action of backwash water pressure, thereby ensuring uniform water and air distribution in the 0 air-water combined backwash stage of the biological filter, avoiding abnormal conditions of uneven backwash in the local area of the filter, overlarge local excessive backwash strength and the like, and ensuring that the filter material of the biological filter 0 always keeps smooth and operates efficiently;
(4) rinsing with water: stopping the backwashing gas system 10 and carrying out the rinsing process of the single backwashing water system 11;
(5) air bleeding: the rinsing process of the backwashing water system 11 is stopped, the exhaust system 12 is opened, due to the gravity extrusion effect of water, the residual air cushion layer at the bottom of the filter plate 2 passes through the air ventilation and distribution device 8 with the uniform height at the top of the spacing filter beam 6, the gas in each multi-grid filter beam space 7 is rapidly and thoroughly discharged out of the water distribution and distribution chamber 1 through the exhaust system 12, the water distribution uniformity of the biological filter 0 in normal operation after backwashing is ensured, meanwhile, the long-time continuous bubble connection in the local area of the filter which does not thoroughly appear in the exhaust system of the residual air cushion layer at the bottom of the filter plate 2 is also avoided, and the problems of poor water outlet sense, large water inlet resistance and poor nitrogen, carbon and phosphorus removal of the biological filter 0 caused by the above.
The back washing system can adopt a back washing program of 'air washing + air-water combined back washing + water rinsing' or a back washing program of 'water level reduction + air washing + air-water combined back washing + water rinsing'.
And the flow velocity of the cross section in the filter rod at the lower end of each filter head 3 is ensured to be not less than 0.1m/s during the water level reduction backwashing.
Example 1:
the treatment flow of a certain sewage treatment plant in Henan province is 100000m3/d, the prokaryotic core process is an oxidation ditch, a secondary sedimentation tank and a front denitrification biological filter, and the biological filter is an upward flow biological filter, wherein a carbon source is added outside the front denitrification biological filter and is mainly used for water quality standard improvement, the operation is about 1 year, the operation pressure is high, the back flushing is extremely uneven, and the treatment effect is poor. The system is transformed, water and gas distribution is uniform after transformation, the pollutant removal efficiency is obviously improved, and the system can continuously and stably run for many years.
Example 2:
a municipal sewage treatment plant in Huaian city, Jiangsu province has the treatment flow of 50000m3/d, the original main process is the process of 'AAO + secondary sedimentation tank + downflow denitrification biological filter', the filter after construction and casting has serious water and gas distribution hysteresis in the back washing process, about one fourth of the gas output at the rear end is small, after carbon source is added, the back washing pressure is too large, the back washing fan is usually protected by overpressure, and the denitrification effect can not reach the design requirement all the time. And then, the system is reformed, a backwashing procedure of 'gas flushing + air-water combined backwashing + water rinsing + air discharging' is adopted, the problem of water and gas distribution hysteresis is thoroughly solved after reforming, the region with insufficient original backwashing gas amount does not exist, and after a carbon source is added, the denitrification removal effect meets or even exceeds the design requirement.
Example 3:
a newly-built treatment plant for certain municipal sewage in Hubei province has the treatment flow of 200000m3/d, adopts the process of a main high-density pond and a preposed denitrification biological filter, adopts a backwashing program of 'water level reduction, air flushing, air water combined backwashing, water rinsing and air discharging', and has the advantages that the backwashing of the filter after construction and casting is even and effective, and after a carbon source is cast, the denitrification removal effect meets or even exceeds the design requirement.
Example 4:
a100000 m3/d standard-improvement nitrogen and phosphorus removal project is newly built in Jiangsu province, a single-stage downward flow biological filter is adopted, a carbon source is added for denitrification and phosphorus removal, a small amount of chemical agent is added for phosphorus removal, a backwashing program of water level reduction, air flushing, air-water combined backwashing, water rinsing and air discharging is adopted, backwashing of the filter is uniform and effective after construction and delivery, and after the carbon source and PAC are added, the denitrification and phosphorus removal effects meet or even far exceed the design requirements.
Example 5:
a newly-built 2000m3/d mark-lifting dephosphorization biofilter marking project in Jiangsu province adopts an adsorption dephosphorization biofilter and adopts a backwashing program of 'air flushing + air-water combined backwashing + water rinsing + air discharging', so that the backwashing of the filter is uniform and effective after the construction and the dephosphorization effect meets or even exceeds the design requirement.
The invention thoroughly solves the problems of uneven water and air distribution during the backwashing of the biological filter, water and air distribution hysteresis in the backwashing process of the biological filter, and low efficiency of removing pollutants caused by the influence of continuous bubbles at multiple positions of the filter due to the fact that a residual air cushion layer cannot be discharged out of a system after the backwashing is finished; the invention solves a series of operation management problems of filter material hardening, high operation pressure, unsmooth water passing, backwashing material spraying and material running and the like caused by insufficient local backwashing strength caused by uneven backwashing water distribution and air distribution of the biological filter from the source,
has great popularization and application value in the technical field of biological filter.
The above-mentioned embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides a high-efficient even quick water distribution gas distribution back flush system of biological filter which characterized in that: the system consists of a biological filter water and gas distribution chamber body, a filter plate, a filter head, a back flush gas distribution main pipe, a back flush gas distribution branch pipe, an interval filter beam, a multi-grid filter beam, a ventilation and gas distribution device, a pressure sensor, a back flush water system, a back flush gas washing system and an exhaust system; the filter plate of the water distribution and air distribution chamber body is divided into a plurality of filter beams by the lower spacing filter beam; the filter head is arranged on the filter plate at the upper part of the multi-lattice filter beam; the pressure sensor is positioned below the filter plate; the backwashing water system is connected below the filter plate in the water distribution and air distribution chamber body; the back-washing gas distribution main pipe is connected with a plurality of back-washing gas distribution branch pipes, and outlets of the back-washing gas distribution branch pipes are respectively connected in the spaces among the single-lattice filter beams; the interval filter beams among the multi-lattice filter beams are communicated through a ventilation and gas distribution device with uniform elevation and uniform fixation, and the ventilation and gas distribution device is positioned at the top of the interval filter beams and below the filter plate; the exhaust system is located below the filter plate.
2. The efficient, uniform and rapid water and gas distribution backwashing system of the biological filter as claimed in claim 1, wherein: and at least 2 filter beams are arranged among the multi-grid filter beams.
3. The efficient, uniform and rapid water and gas distribution backwashing system of the biological filter as claimed in claim 1, wherein: the bottom of the backwash air distribution branch pipe extends to 1/5-4/5 of the backwash air distribution main pipe, and the top of the backwash air distribution branch pipe extends to 2-80mm below the filter plate.
4. The efficient, uniform and rapid water and gas distribution backwashing system of the biological filter as claimed in claim 1, wherein: the distance between the air ventilation and distribution devices in the spaced filter beams is 800mm, and the distance between the center of the air ventilation and distribution devices and the top surface of the filter beams is 5-100 mm.
5. The efficient, uniform and rapid water and gas distribution backwashing system of the biological filter as claimed in claim 1, wherein: the backwash air distribution main pipe and the backwash air distribution branch pipe are made of UPVC materials, carbon steel materials, stainless steel materials, concrete materials, plastic materials, high polymer materials, FRPP materials and other corrosion-resistant materials.
6. The efficient, uniform and rapid water and gas distribution backwashing system of the biological filter as claimed in claim 1, wherein: the structure form of the biological filter is an upward flow biological filter or a downward flow biological filter; the oxygen supply type of the biological filter can be an aerobic biological filter, an anoxic biological filter or an anaerobic biological filter; the function type of the biological filter can be a nitrification biological filter, a nitrogen deletion biological filter, a denitrification biological filter, a carbon removal nitrification biological filter or a phosphorus removal biological filter.
7. The efficient, uniform and rapid water and gas distribution backwashing system of the biological filter as claimed in claim 1, wherein: the filter head of the biological filter is a long-handle filter head, a short-handle filter head, an adjustable filter head or a detachable filter head; the ventilation and air distribution device is a communicating pipe or a communicating hole, and the shape of the pipe or the hole of the communicating pipe or the communicating hole is round, square or irregular.
8. A use method of a high-efficiency uniform and rapid water and gas distribution backwashing system of a biological filter comprises the following steps:
(1) before backwashing: the pressure sensor is used for measuring and reading the resistance value of the biological filter;
(2) air flushing: the backwashing gas enters the backwashing gas distribution branch pipes through the backwashing gas distribution main pipe and rapidly enters among the multiple filter beams in the water and gas distribution chamber of the biological filter to sequentially form air cushion layers with different thicknesses, the air cushion layers with different thicknesses among the multiple filter beams are communicated through a ventilation and gas distribution device with uniform height in the top of the interval filter beam, and an integral air cushion layer with uniform thickness is rapidly formed at the bottom of the filter plate of the water and gas distribution chamber and uniformly gas-washes the biological filter through the filter head, so that the condition that the biological filter is uniformly backwashed or excessively washed due to nonuniform gas distribution is avoided, and the abnormal conditions of hardened filter materials, sprayed materials, high water passing pressure and the like caused by insufficient long-term backwashing in a local area are avoided;
(3) air-water combined backwashing: keeping the starting process of the air backwashing system, enabling backwashing water to enter the water distribution and air distribution chamber of the biological filter through the backwashing water system, gradually rising through the bottom of the water distribution and air distribution chamber of the biological filter due to the fact that the specific gravity of water is larger than that of air, and gradually squeezing the air cushion layer among the multi-grid filter beams, so that air-water combined backwashing on the biological filter is formed through the filter head. Because of the air distribution device with uniform height which is pre-embedded at the top of the spacing filter beam (the bottom of the filter plate), the air cushion layer with reduced thickness can still keep uniform thickness under the action of backwash water pressure, thereby ensuring uniform water and air distribution in the air-water combined backwash stage of the biological filter, avoiding abnormal conditions of uneven backwash in the local area of the filter, overlarge local excessive backwash strength and the like, and ensuring that the filter material of the biological filter always keeps smooth and high-efficiency operation;
(4) rinsing with water: stopping the back flushing gas system, and carrying out a rinsing process of an independent back flushing water system;
(5) air bleeding: and stopping the rinsing process of the backwashing water system, opening the exhaust system, and quickly and thoroughly discharging the gas in the spaces among the multi-lattice filter beams out of the water and gas distribution chamber through the exhaust system by virtue of the air cushion layer remained at the bottom of the filter plate through the ventilation and gas distribution device with the uniform elevation at the top of the spaced filter beams under the action of gravity extrusion of water. The uniformity of water distribution of the normal operation of the biological filter after backwashing is ensured, and meanwhile, the long-time continuous bubble connection in the local area of the filter, which is not completely caused by the residual air cushion layer discharge system at the bottom of the filter plate, is avoided, and the problems of poor water outlet sense, large water inlet resistance and poor nitrogen and carbon removal and phosphorus removal of the biological filter, which are caused by the long-time continuous bubble connection, are solved.
9. The use method of the high-efficiency uniform and rapid water and gas distribution backwashing system of the biological filter according to claim 8, wherein the system comprises the following steps: the back washing system can adopt a back washing program of 'air washing + air-water combined back washing + water rinsing' or a back washing program of 'water level reduction + air washing + air-water combined back washing + water rinsing'.
10. The use method of the high-efficiency uniform and rapid water and gas distribution backwashing system of the biological filter according to claim 9, wherein the system comprises the following steps: and the flow velocity of the cross section in the filter rod at the lower end of each filter head is not less than 0.1m/s during the water level reduction backwashing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010603417.2A CN111606411B (en) | 2020-06-29 | 2020-06-29 | Efficient, uniform and rapid water and gas distribution backwashing system of biological filter and application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010603417.2A CN111606411B (en) | 2020-06-29 | 2020-06-29 | Efficient, uniform and rapid water and gas distribution backwashing system of biological filter and application method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111606411A true CN111606411A (en) | 2020-09-01 |
| CN111606411B CN111606411B (en) | 2024-04-12 |
Family
ID=72202490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010603417.2A Active CN111606411B (en) | 2020-06-29 | 2020-06-29 | Efficient, uniform and rapid water and gas distribution backwashing system of biological filter and application method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111606411B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112279345A (en) * | 2020-10-26 | 2021-01-29 | 济南大学 | Method for solving electrochemical cathode scaling |
| CN112678943A (en) * | 2020-12-25 | 2021-04-20 | 马鞍山奥柯环保科技发展有限公司 | Modularized biological aerated filter |
| CN113072168A (en) * | 2021-04-16 | 2021-07-06 | 安徽三番环保工程有限公司 | Force eliminating grid, cleaning method thereof and biological filtering equipment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008055282A (en) * | 2006-08-30 | 2008-03-13 | Toshiba Corp | Filtration system |
| CN203829718U (en) * | 2014-05-21 | 2014-09-17 | 广州海滔环保科技有限公司 | High efficiency energy-saving automatic V-type filter |
| CN204170467U (en) * | 2014-09-30 | 2015-02-25 | 天津市华水自来水建设有限公司 | A kind of conventional rapid filter adopting combined water and air backwash |
| CN206607121U (en) * | 2016-12-27 | 2017-11-03 | 浩蓝环保股份有限公司 | Biological activated carbon absorption, degraded, filtering integral equipment |
| CN207748917U (en) * | 2017-11-29 | 2018-08-21 | 宁夏绿色之星环保工程有限公司 | A kind of short-cut nitrification and denitrification water-distributing device |
| CN209651975U (en) * | 2019-02-22 | 2019-11-19 | 合肥中盛水务发展有限公司 | Denitrification deep-bed filter system |
| CN213416406U (en) * | 2020-06-29 | 2021-06-11 | 安徽绿衡环保科技有限公司 | Efficient, uniform and rapid water and gas distribution backwashing system of biological filter |
-
2020
- 2020-06-29 CN CN202010603417.2A patent/CN111606411B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008055282A (en) * | 2006-08-30 | 2008-03-13 | Toshiba Corp | Filtration system |
| CN203829718U (en) * | 2014-05-21 | 2014-09-17 | 广州海滔环保科技有限公司 | High efficiency energy-saving automatic V-type filter |
| CN204170467U (en) * | 2014-09-30 | 2015-02-25 | 天津市华水自来水建设有限公司 | A kind of conventional rapid filter adopting combined water and air backwash |
| CN206607121U (en) * | 2016-12-27 | 2017-11-03 | 浩蓝环保股份有限公司 | Biological activated carbon absorption, degraded, filtering integral equipment |
| CN207748917U (en) * | 2017-11-29 | 2018-08-21 | 宁夏绿色之星环保工程有限公司 | A kind of short-cut nitrification and denitrification water-distributing device |
| CN209651975U (en) * | 2019-02-22 | 2019-11-19 | 合肥中盛水务发展有限公司 | Denitrification deep-bed filter system |
| CN213416406U (en) * | 2020-06-29 | 2021-06-11 | 安徽绿衡环保科技有限公司 | Efficient, uniform and rapid water and gas distribution backwashing system of biological filter |
Non-Patent Citations (1)
| Title |
|---|
| 马志毅: "《工业水污染控制》", 中国建筑工业出版社, pages: 386 - 387 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112279345A (en) * | 2020-10-26 | 2021-01-29 | 济南大学 | Method for solving electrochemical cathode scaling |
| CN112678943A (en) * | 2020-12-25 | 2021-04-20 | 马鞍山奥柯环保科技发展有限公司 | Modularized biological aerated filter |
| CN112678943B (en) * | 2020-12-25 | 2024-01-30 | 马鞍山奥柯环保科技发展有限公司 | Modularized aeration biological filter |
| CN113072168A (en) * | 2021-04-16 | 2021-07-06 | 安徽三番环保工程有限公司 | Force eliminating grid, cleaning method thereof and biological filtering equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111606411B (en) | 2024-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111606411B (en) | Efficient, uniform and rapid water and gas distribution backwashing system of biological filter and application method | |
| CN205294949U (en) | High -efficient bological aerated filter | |
| CN108314183A (en) | A kind of operation method of denitrification deep-bed filter system | |
| CN213416406U (en) | Efficient, uniform and rapid water and gas distribution backwashing system of biological filter | |
| CN111470612A (en) | Efficient intelligent backwashing system of upward flow biological filter | |
| CN111186965A (en) | Sewage upgrading and modifying method adopting ultra-high filtration speed denitrification biological filter system | |
| CN206783391U (en) | A kind of efficiently backwash BAF | |
| CN111170590A (en) | Ultra-high-filtration-speed IV-class upgrading modified nitrogen and phosphorus removal device and treatment process thereof | |
| CN100564280C (en) | But the high-rate filter of back flushing | |
| CN212246647U (en) | Ultra-high-filtration-speed nitrogen and phosphorus removal device improved by IV-class water standard | |
| CN206447646U (en) | Sewage-treatment plant | |
| CN2568636Y (en) | Contact oxidation biological filter cell adapting suspension filtering material | |
| CN201406344Y (en) | Biologic fixed bed reactor | |
| CN212246397U (en) | Novel denitrification filter device based on organic polymer carrier | |
| CN111689573A (en) | Multiple-water-level-reduction backwashing method for thoroughly solving hardening of biological filter | |
| CN208964618U (en) | The box biological aerated filter of integration | |
| CN211620045U (en) | Novel hydrolysis acidification pool | |
| CN2773061Y (en) | Biological-membrane waste water treater | |
| CN208361984U (en) | It is a kind of for being electroplated, board wastewater processing multi-stage aeration biological filter tank | |
| CN209276220U (en) | A kind of triangle helical packing for biofilter | |
| CN202322494U (en) | Anaerobic and aerobic sewage treatment device | |
| CN207158890U (en) | Circulation pressure-fired fixed-bed bioreactor in a kind of | |
| CN201971682U (en) | Micro-flocculating and dephosphorizing device of upflow type nitrifying/denitrifying biological filtration pond | |
| CN111138047A (en) | Denitrification and dephosphorization device with advanced standard improvement and treatment process thereof | |
| CN219526395U (en) | Nitrifying and denitrifying mobile biomembrane reactor |
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 |