CN111704240B - Negative-pressure backwashing denitrification biological filter and cleaning method - Google Patents
Negative-pressure backwashing denitrification biological filter and cleaning method Download PDFInfo
- Publication number
- CN111704240B CN111704240B CN202010586097.4A CN202010586097A CN111704240B CN 111704240 B CN111704240 B CN 111704240B CN 202010586097 A CN202010586097 A CN 202010586097A CN 111704240 B CN111704240 B CN 111704240B
- Authority
- CN
- China
- Prior art keywords
- water
- backwashing
- filter
- denitrification
- negative pressure
- 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
- C02F3/2826—Anaerobic digestion processes using anaerobic filters
-
- 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
- C02F3/2866—Particular arrangements for anaerobic reactors
-
- 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
-
- 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
- C02F2303/16—Regeneration of sorbents, filters
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)
- Biological Treatment Of Waste Water (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to the technical field of a backwashing cleaning process of a biological filter, in particular to a negative-pressure backwashing denitrification biological filter and a cleaning method. Including the filtering pond body, this internal packing layer that sets up in filtering pond, the packing layer below is equipped with the ejector, and the filtering pond body is equipped with blow vent, water inlet and delivery port, and the water inlet setting is in filtering pond body bottom, and the delivery port setting is at filtering pond body top, and the vacuum pump is linked together through the pipeline with filtering pond body top, still includes vibrating device, and vibrating device sets up on the outer wall of filtering pond body. The invention also provides a cleaning method of the negative pressure backwashing denitrification biological filter, which comprises the following steps: manufacturing negative pressure; jet flow backwashing; and (5) washing with water. According to the scheme, the packing layer is effectively and uniformly backwashed under the condition that the air washing step is not used, the problem of blockage of the packing layer is solved, the dissolved oxygen condition in the reactor is not damaged, the required energy consumption in the backwashing process is reduced, and the denitrification efficiency when the use scene is the denitrification filter tank is improved.
Description
Technical Field
The invention relates to the technical field of a backwashing cleaning process of a biological filter, in particular to a negative-pressure backwashing denitrification biological filter and a cleaning method.
Background
In recent years, the focus in the field of wastewater treatment has shifted from the degradation of organic matter to the deep removal of nutrient elements such as nitrogen and phosphorus. After excessive nitrogen or phosphorus elements are discharged into the water body, water bloom and other water body pollution conditions are easily generated. National and local governments are gradually raising the discharge standard of sewage and reducing the discharge content of pollutants such as nitrogen, phosphorus and the like. Phosphorus in the wastewater can be removed simply and efficiently by a chemical means, but deep denitrification is the main bottleneck of sewage upgrading and reconstruction. The traditional sewage treatment process has low nitrogen removal efficiency, which results in high nitrogen content in the effluent. The denitrification filter tank is an effective two-stage effluent advanced treatment process, has the characteristics of small floor area and good effluent quality, does not influence the preorder process, and can reduce the reconstruction cost. Because of good denitrification effect, the method becomes a hotspot technology for research and application in the field of sewage advanced treatment. However, in the course of operation of the denitrification biological filter, biological flocs, suspended solids and excessive biofilm on the surface of the filler contained in the inlet water may cause the blockage of the filter material layer, and the treatment effect of the filter is affected. Therefore, the filter chamber needs to be backwashed to restore its normal water purification function.
In the prior art, a back washing means is mostly adopted to clean the denitrification filter, and the back washing is an essential link for controlling the thickness of the biological membrane and preventing the filter from being blocked, and has important significance for the engineering application of the denitrification biological filter. For example, Chinese patent publication No. CN102092849A entitled "a novel denitrification and backwashing process method for biological filter", discloses a novel denitrification and backwashing process method for biological filter, which comprises the following steps: in the filtering operation period of the filter tank, before the filter materials are hardened, the filter tank is subjected to pre-air flushing, the microbial connectors among the filter materials are broken by air bubbles generated by air flushing, a drainage device is arranged in a sludge high-concentration area of the filter tank, the filter tank stops operating when the filter tank is filtered until the head loss reaches the designed maximum allowable head loss, water in a sludge medium-concentration area and water in a sludge low-concentration area are drained through the drainage device, and the sludge high-concentration area is subjected to pre-backwashing respectively when the head loss reaches the designed maximum allowable head loss.
In the prior art, a gas-water combined backwashing mode is generally adopted to carry out regular backwashing on the filter tank so as to elute suspended matters and fallen biological membranes in the filter tank. The procedure is as follows: firstly, washing with air, then washing with air and water, and finally rinsing with water. However, the strength, time and period of backwashing of the filter tanks with different functions, different forms and different filter materials are different, the method has the defects of high water consumption and energy consumption, uneven backwashing and weak shearing, collision and friction effects, and practice proves that the method is a weak backwashing mode and cannot completely eliminate mud balls and caking phenomena on the filter materials. Meanwhile, the expansion of the filter bed causes the hydraulic classification of the filter material after backwashing, which brings many disadvantages to the filtration, such as: the energy consumption is high; washing is not uniform, and dead corners are easy to remain; the large amount of air washing destroys the environment required by the denitrification filter.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the technical problems that when the biological filter is cleaned in the prior art, the air-water alternate backwashing energy consumption is overlarge, the cleaning is uneven, dead corners are easy to remain, and dissolved oxygen conditions can be damaged by air washing, so that the denitrification efficiency of the denitrification biological filter is influenced. The scheme provides the low-energy-consumption negative-pressure backwashing biological filter device, effectively and uniformly backwashing the filler under the condition of not using a gas washing step, solves the problem of blockage of the filler layer, saves energy consumption, does not damage the dissolved oxygen condition in the reactor, and improves the denitrification efficiency.
2. Technical scheme
In order to achieve the purpose, the technical scheme is as follows:
the invention relates to a negative pressure backwashing denitrification biological filter, which comprises a filter body, wherein a filler layer is arranged in the filter body; an ejector is arranged below the packing layer; the filter body is equipped with blow vent, water inlet and delivery port, still includes the vacuum pump, the water inlet sets up in filter body bottom, the delivery port sets up at filter body top, the vacuum pump is linked together through the pipeline with filter body top.
Furthermore, the distance between the top of the filler layer and the top of the filter body is 1/10-1/6 of the height of the filter body.
Further, a filter plate is arranged below the packing layer, and the ejector is arranged on the filter plate.
The water inlet is communicated with the back flush water pump through a pipeline, a water inlet valve is arranged on a connecting pipeline of the water inlet and the back flush water pump, and a water outlet valve is arranged at the water outlet.
Further, still include vibrating device, vibrating device sets up on the filtering pond body outer wall.
Furthermore, the vibrating device is annular and is arranged on the outer wall of the filter body corresponding to the packing layer.
A cleaning method of a negative pressure backwashing denitrification biological filter comprises the following steps:
manufacturing negative pressure: closing the air vent, the water inlet valve and the water outlet valve, and starting the vacuum pump;
backwashing: after reaching the set pressure range, closing the vacuum pump, starting the internal circulating water pump, and after reaching the set time, closing the internal circulating water pump and opening the air vent;
washing with water; after the internal and external pressures of the filter body are balanced, the water inlet valve and the water outlet valve are opened, and the backwashing water pump is started.
Further, the method also comprises the following steps: and after the water washing step is finished, starting a vibration device to exhaust.
Further, the pressure range is 50-80 kPa; the time of the back washing step is 15-20 min; the water washing step is carried out, wherein the strength is 8-15L/(m)2S) for 5-10 min.
Further, it is characterized in that: in the exhausting step, the opening time of the vibration device is 3-5 min.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) according to the negative pressure backwashing denitrification biological filter disclosed by the invention, the vacuum pump is arranged at the top of the filter body and is communicated by adopting the pipeline, water flows through the packing layer from bottom to top by utilizing a negative pressure environment formed by the vacuum pump to wash the packing layer, the air washing step in the prior art is eliminated, and the manufacturing negative pressure, jet flow backwashing and water washing steps are adopted, so that a smaller amount of gas can be generated during operation compared with the traditional air washing mode, and when the negative pressure backwashing denitrification biological filter is applied to occasions requiring anaerobic or anoxic conditions, such as the denitrification filter, the dissolved oxygen condition in a reactor cannot be destroyed, and the biodegradation of the reactor is more efficient and stable.
(2) According to the negative pressure backwashing denitrification biological filter disclosed by the invention, the distance between the top of the packing layer and the top of the filter body is 1/10-1/6 of the height of the filter body, a free water layer and an ultrahigh layer are formed between the top of the packing layer and the top of the filter body during cleaning, when the ejector and the internal circulation water pump are started, the washing force and the cleaning angle of water flow ejected by the ejector on the packing layer are effectively increased, and most of cleaned water is discharged through the water outlet valve. Along with the increase of inside water yield, and because the existence of super high-rise and free water layer, the inside rivers direction of whole equipment forms the washing effect to the packing layer towards the lower delivery port of pressure on equipment cross section, compares in traditional air purge, does not have clean blind area, and the dead angle region that the air purge is difficult to clean is also washed clean.
(3) According to the negative pressure backwashing denitrification biological filter disclosed by the invention, the vibrator is arranged on the filter body, after the cleaning step is completed, the reactor is used before the reactor starts to operate, and gas possibly accumulated in the filler in the cleaning process is discharged through the vibrator, so that the denitrification efficiency is further improved.
(4) According to the negative pressure backwashing denitrification biofilter and the method, by virtue of the negative pressure design of the ultra-high layer and the self-water layer, under the condition that the step of air washing is abandoned, the back washing is performed on the filler more effectively and uniformly, the problem of blockage of the filler layer is solved, and the pressure range is fixed to be 50-80 kPa; the time of the back washing step is 15-20 min; the strength of the water washing step is 8-15L/(m 2 & s), and the time is 5-10 min; and starting the vibration device for 3-5 min. Compared with the reactors with the same volume size which are subjected to gas washing in the market, the reactor is more efficient, saves cleaning time, saves energy and reduces energy consumption.
Drawings
FIG. 1 is a schematic structural diagram of a negative pressure backwashing denitrification biological filter of the invention.
In the figure, 1: a filter body; 2: a filler layer; 3: a super high layer; 4: a free aqueous layer; 5: filtering the plate; 6: an ejector; 7: an internal circulation water pump; 8: a water inlet valve; 9: backwashing the water pump; 10: backwashing the water pool; 11: a vacuum pump; 12: a negative pressure valve; 13: a water outlet pool; 14: a water outlet valve; 15: a vibrating device.
Detailed Description
The invention is further described with reference to specific examples.
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention relates to a negative pressure backwashing denitrification biological filter, which comprises a filter body 1, wherein a filler layer 2 and a vacuum pump 11 are arranged in the filter body 1, and the material of the filler layer can be freely selected according to the requirement; an ejector 6 is arranged below the packing layer 2; the filter body 1 is provided with an air vent, a water inlet and a water outlet. The water inlet is arranged at the bottom of the filter body 1, the water outlet is arranged at the top of the filter body 1, the vacuum pump 11 is communicated with the top of the filter body 1 through a pipeline, and a negative pressure valve 12 can be arranged between the vacuum pump 11 and the filter body 1. The air vent sets up on filtering pond body 1, in the actual scene, can also not set up the air vent, replaces the air vent with the water inlet, need cut off the connection of inlet valve 8 and water source this moment, treats filtering pond body 1 internal and external balanced back, connects the water source back again when filtering pond body 1 prepares to use.
The distance of 2 tops of packing layer and 1 top of filtering pond body sets up 1/10 ~ 1/6 for the filtering pond body 1 height, washs the operation when filtering pond body 1, and when vacuum pump 11 was opened, can form free water layer 4 and superelevation layer 3 in the packing layer 2 top, and air pump 11 enables superelevation layer 3 and is the negative pressure state, sets up the delivery port in free water layer department, and the waste water after the cleanness of being convenient for in time discharges, and can not influence the secondary cleaning effect of the comparatively clean water in lower part to the packing layer.
The filter plate 5 is arranged below the packing layer 2, the jet device 6 is arranged on the filter plate 5, in the practical application scene, the existence of the filter plate 5 enables the jet device 6 to have a better fixed point, and the number and the arrangement of the jet devices 6 can be optimally selected according to the size and the height of the filter body 1.
The jet device 6 is connected with an internal circulation water pump 7, a water inlet is communicated with a back flush water pump 9 through a pipeline, a water inlet valve 8 is arranged on a connecting pipeline of the two, a water outlet valve 14 is arranged at the water outlet, the back flush water pump 9 can also be connected with a back flush water pool 10, and the water outlet valve 14 can also be provided with a water outlet pool 13. The ejector 6 is connected with an internal circulating water pump 7. The vacuum pump 11 is used for making the super high layer 3 in a negative pressure state, in this state, when the ejector 6 and the internal circulation water pump 7 are started, the flushing force and the cleaning angle of the water flow ejected by the ejector 6 to the packing layer 2 are effectively increased, and most of the cleaned water is discharged through the water outlet valve 14. Along with the increase of inside water yield, and because the existence of super high-rise 3 and free water layer 4, the inside rivers direction of whole equipment is towards the lower delivery port of pressure, forms the effect of erodeing to packing layer 2 on the equipment cross section, compares in traditional air purge, does not have clean blind area, and the dead angle region that the air purge is difficult to clean is also washed cleanly.
The filter body 1 of the embodiment is further provided with a vibrating device 15, the vibrating device 15 is arranged on the outer wall of the filter body 1, and in an actual application scene, the vibrating device 15 can also be arranged on the inner wall of the filter body 1. The vibrating device 15 is annular, the vibrating device 15 is arranged on the outer wall of the filter tank body 1 corresponding to the filler layer 2, so that the vibration effect is mainly concentrated around the seasoning layer, and the vibrating device with annular design can form stable and maximum-efficiency vibration for the filler layer, so that the gas in the filler layer is discharged more thoroughly. In the application scene of the denitrification reactor, after the cleaning step is finished, the reactor is used before the operation is started, and the vibrator is used for removing gas possibly accumulated in the filler in the cleaning process, so that the denitrification efficiency is further improved.
Example 2
A cleaning method of a negative pressure backwashing denitrification biological filter comprises the following steps:
manufacturing negative pressure: closing the air vent, the water inlet valve 8 and the water outlet valve 14, and starting the vacuum pump 11;
backwashing: after the set pressure reaches 50kPa, the vacuum pump 11 is closed, the internal circulating water pump 7 is started, and after the set time reaches 15min, the internal circulating water pump 7 is closed, and the air vent is opened;
washing with water; after the internal and external pressures of the filter body 1 are balanced, the water inlet valve 8 and the water outlet valve 14 are opened, and the backwashing water pump 9 is started; the intensity is 8L/(m)2S) for 5 min;
and (3) exhausting: the vibrating device 15 is turned on for 3 min.
After the back flushing operation, compared with the prior back flushing operation, under the condition of the same water inlet pressure, the filtering speed of the filter tank is increased from 0.62m/h to 0.86m/h, which shows that the back flushing effectively dredges the blockage of the filter tank. The denitrification rates before and after the back flush of the denitrification filter tank are respectively 0.65kg N/(m)3D) and 0.72kg N/(m)3D), indicating that the back washing does not influence the denitrification efficiency, and on the contrary, the denitrification efficiency is improved to a certain extent due to the fact that the biological membrane is updated, the packing layer is dredged, and the mass transfer area between the biological membrane and water is increased.
Example 3
A cleaning method of a negative pressure backwashing denitrification biological filter comprises the following steps:
manufacturing negative pressure: closing the air vent, the water inlet valve 8 and the water outlet valve 14, and starting the vacuum pump 11;
backwashing: after the set pressure of 65kPa is reached, the vacuum pump 11 is closed, the internal circulating water pump 7 is started, and after the set time of 18 min is reached, the internal circulating water pump 7 is closed, and the air vent is opened;
washing with water; after the internal and external pressures of the filter body 1 are balanced, the water inlet valve 8 and the water outlet valve 14 are opened, and the backwashing water pump 9 is started; the intensity is 12L/(m)2S) for 8 min;
and (3) exhausting: after the water washing step, the vibrating device 15 was turned on for 4 min.
Example 4
A cleaning method of a negative pressure backwashing denitrification biological filter comprises the following steps:
manufacturing negative pressure: closing the air vent, the water inlet valve 8 and the water outlet valve 14, and starting the vacuum pump 11;
backwashing: after the set pressure of 80kPa is reached, the vacuum pump 11 is closed, the internal circulating water pump 7 is started, and after the set time is reached for 20min, the internal circulating water pump 7 is closed, and the vent is opened;
washing with water; after the internal and external pressures of the filter body 1 are balanced, the water inlet valve 8 and the water outlet valve 14 are opened, and the backwashing water pump 9 is started; the intensity is 15L/(m)2S) for 10 min;
and (3) exhausting: after the water washing step, the vibrating device 15 is turned on for 5 min.
Example 5
Treatment of 6m3The height-diameter ratio of the filler tank is 2.5, the height of the water distribution area is 0.8m, the filter material is cobblestones and sulfur particles, the overall height of the filter material is 1.6m, the height of the cobblestones on the bearing layer is 0.3m, and the vacuum pump is selected to be 1.5m3The water pump selection efficiency is 1m3The selection efficiency of the circulating water pump is 3m3H is used as the reference value. If a negative pressure mode is adopted for backwashing, the power of a vacuum pump, an internal circulation water pump, a backwashing water pump and a vibrator is respectively 0.45kw, 0.75kw, 0.55kw and 0.25kw, the running time is respectively 5min, 20min, 15min and 5min, and according to an energy consumption calculation formula: the power is multiplied by the time, and the energy consumption of the vacuum pump, the internal circulation water pump, the backwashing water pump and the vibrator can be calculated as follows: 0.04 kw.h, 0.25 kw.h, 0.14 kw.h and 0.02 kw.h, in total 0.45 kw.h.
The traditional backwashing mode generally adopts the steps of firstly moving gas to flush for 10min, then carrying out gas-water combined flushing for 6min and finally carrying out water flushing for 20 min. Under the same conditions, the consumed power is respectively: 0.08kw · h, 0.25kw · h, 0.33kw · h, in total 0.66kw · h.
The power equation consumed in the air impact process is as follows:
p in the formula, the power consumed by the slurry in the gas stirring tank, W;
h-thickness of the slurry in the tank, m;
z is the distance from the exhaust level to the bottom of the tank, m;
ρ 1 ——density of the slurry, kg/m3，
P0The pressure, Pa,
QAvolume flow of gas, m3/s。
It is known that when the pressure in the tube decreases, the power consumed by the gas purge decreases.
Comparing the total energy consumption, the energy consumption (0.45kw · h) of the negative pressure back washing mode is far less than the energy consumption (0.66kw · h) of the traditional back washing mode. The method can prove to have the following three good benefits: the problem of overlarge backwashing power is solved, and energy consumption is saved; the filler is effectively and uniformly back-flushed; solves the problem of blockage of the packing layer, does not use air washing, does not destroy the dissolved oxygen condition in the reactor, and eliminates the gas accumulated in the packing, thereby improving the denitrification efficiency.
Claims (6)
1. A negative pressure back-flushing denitrification biological filter comprises a filter body (1), wherein a filler layer (2) is arranged in the filter body (1); an ejector (6) is arranged below the packing layer (2); the filter body (1) is provided with an air vent, a water inlet and a water outlet, and is characterized in that: the water inlet is arranged at the bottom of the filter body (1), the water outlet is arranged at the top of the filter body (1), and the vacuum pump (11) is communicated with the top of the filter body (1) through a pipeline;
the distance between the top of the packing layer (2) and the top of the filter body (1) is 1/10-1/6 of the height of the filter body (1);
a filter plate (5) is arranged below the packing layer (2), and the ejector (6) is arranged on the filter plate (5);
the jet device (6) is connected with the internal circulating water pump (7), the water inlet is communicated with the back flush water pump (9) through a pipeline, a water inlet valve (8) is arranged on a connecting pipeline of the water inlet and the back flush water pump, and a water outlet valve (14) is arranged at the water outlet;
the filter tank is characterized by further comprising a vibrating device (15), wherein the vibrating device (15) is arranged on the outer wall of the filter tank body (1).
2. The negative pressure backwashing denitrification biofilter according to claim 1, wherein: the vibrating device (15) is annular, and the vibrating device (15) is arranged on the outer wall of the filter body (1) corresponding to the packing layer (2).
3. A method for cleaning a denitrification biological filter by using negative pressure back flushing according to any one of claims 1-2, which is characterized in that: the method comprises the following steps:
manufacturing negative pressure: closing the air vent, the water inlet valve (8) and the water outlet valve (14), and starting the vacuum pump (11);
backwashing: after reaching the set pressure range, closing the vacuum pump (11), starting the internal circulating water pump (7), and after reaching the set time, closing the internal circulating water pump (7) and opening the air vent;
washing with water: after the internal and external pressures of the filter body (1) are balanced, the water inlet valve (8) and the water outlet valve (14) are opened, and the backwashing water pump (9) is started.
4. The method for cleaning the negative pressure backwashing denitrification biofilter according to claim 3, wherein the method comprises the following steps: further comprises an exhaust step: after the water washing step is finished, the vibrating device (15) is started to exhaust.
5. The method for cleaning the negative pressure backwashing denitrification biofilter according to claim 3, wherein the method comprises the following steps: the pressure range is 50-80 kPa; the time of the back washing step is 15-20 min; the water washing step is carried out, wherein the strength is 8-15L/(m)2S) for 5-10 min.
6. The method for cleaning the negative pressure backwashing denitrification biofilter according to claim 4, wherein the method comprises the following steps: in the exhausting step, the opening time of the vibration device (15) is 3-5 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010586097.4A CN111704240B (en) | 2020-06-24 | 2020-06-24 | Negative-pressure backwashing denitrification biological filter and cleaning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010586097.4A CN111704240B (en) | 2020-06-24 | 2020-06-24 | Negative-pressure backwashing denitrification biological filter and cleaning method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111704240A CN111704240A (en) | 2020-09-25 |
| CN111704240B true CN111704240B (en) | 2021-11-02 |
Family
ID=72542525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010586097.4A Active CN111704240B (en) | 2020-06-24 | 2020-06-24 | Negative-pressure backwashing denitrification biological filter and cleaning method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111704240B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113480003A (en) * | 2021-07-13 | 2021-10-08 | 西安建筑科技大学 | Non-backwashing movable nitrogen-driving device for denitrification filter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007138604A2 (en) * | 2006-06-01 | 2007-12-06 | Ben-Gurion University Of The Negev Research And Development Authority | Denitrification treatment system and method |
| CN102092849A (en) * | 2011-01-07 | 2011-06-15 | 汤苏云 | New denitrification and backwashing process of biofilter |
| CN103011390A (en) * | 2012-12-29 | 2013-04-03 | 同济大学苏州研究院 | Novel diving jet-type biological aerated filter |
-
2020
- 2020-06-24 CN CN202010586097.4A patent/CN111704240B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007138604A2 (en) * | 2006-06-01 | 2007-12-06 | Ben-Gurion University Of The Negev Research And Development Authority | Denitrification treatment system and method |
| CN102092849A (en) * | 2011-01-07 | 2011-06-15 | 汤苏云 | New denitrification and backwashing process of biofilter |
| CN103011390A (en) * | 2012-12-29 | 2013-04-03 | 同济大学苏州研究院 | Novel diving jet-type biological aerated filter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111704240A (en) | 2020-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111054218A (en) | Green and rapid cleaning device and cleaning method for flat ceramic membrane | |
| CN111704240B (en) | Negative-pressure backwashing denitrification biological filter and cleaning method | |
| CN109399793A (en) | A kind of precipitating filter back-flush reinforcing mud-water separation integrated water treatment equipment | |
| CN102020370A (en) | Sewage advanced treatment method and device thereof | |
| CN209098440U (en) | A kind of small-sized integrated countryside sewage treatment equipment of double iris types | |
| CN202924819U (en) | Aeration biological filter tank | |
| CN102923842B (en) | Aerated biological filtration tank | |
| CN103112944B (en) | Internal circulating nitrification filtering tank | |
| JP2004141724A (en) | Solid-liquid separator and washing method therefor | |
| CN108483794B (en) | Sewage treatment system | |
| CN207525100U (en) | A kind of drum type brake integrated sewage treating apparatus | |
| CN214457093U (en) | High-efficiency ozone catalytic oxidation reactor | |
| CN206447745U (en) | A kind of small-sized septic tank | |
| CN214115164U (en) | Waste water treatment equipment for circulating water tank of spray tower | |
| CN212334941U (en) | Integrated high-efficiency biological sewage treatment device | |
| CN201501818U (en) | Efficient catalytic oxidation filter | |
| CN204474401U (en) | A kind of aeration/precipitation integral type active sludge waste disposal plant | |
| CN203768096U (en) | Reverse aeration biological filtration device | |
| CN210030226U (en) | Paper pulp sewage recovery system | |
| CN208700832U (en) | A kind of regeneration treatment system of high concentrated organic wastewater with high salt | |
| CN101585598A (en) | High-efficiency jet aeration rotational flow type active sludge sewage treatment system | |
| CN220413049U (en) | Batch tank type membrane bioreactor | |
| CN213347973U (en) | Gravity type valveless filter back-flushing wastewater filtering device | |
| CN213112713U (en) | Back flush system of upflow type denitrification filter | |
| CN219174383U (en) | Wastewater treatment mechanism |
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 |