CN210313696U - Improved denitrification deep bed filter - Google Patents
Improved denitrification deep bed filter Download PDFInfo
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- CN210313696U CN210313696U CN201921106737.6U CN201921106737U CN210313696U CN 210313696 U CN210313696 U CN 210313696U CN 201921106737 U CN201921106737 U CN 201921106737U CN 210313696 U CN210313696 U CN 210313696U
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Abstract
The utility model discloses an improved denitrification deep bed filter. The method is characterized in that: comprises a filter tank, a filter tank water distribution channel, a water inlet, a drug adding and mixing area, a clean water tank, a back flush wastewater tank, a filter material, a back flush water pump and a blower; the utility model discloses the main energy consumption in the deep bed filtering pond of denitrification that corresponds is back flush water pump and air-blower power consumption, at the back flush in-process, it is the important way of control microorganism volume to control the filter bed flow state, make old biofilm evenly drop, resume the ultra-thin biofilm of filter material, keep the lasting renewal of biofilm, this is the key link that the biological filter keeps high-efficient biological purification function for a long time, the lectotype of event back flush water pump becomes especially important, this technical scheme adopts the rotor pump as the back flush water pump, both reach energy-conserving purpose, can improve biological denitrification efficiency simultaneously again.
Description
Technical Field
The utility model relates to a sewage treatment field, particularly a deep bed filtering pond of improvement denitrification.
Background
With the development of economy and the increasing concern of people on environmental pollution, the standards of sewage discharge into water bodies are continuously improved in various places, and particularly the strict control standards on the nitrogen and phosphorus contents are provided.
The denitrification deep bed filter (DN) is a form of a biological filter, namely a biological membrane is cultured on the surface of a filter material of the filter, Suspended Solids (SS) are removed by means of denitrification of microorganisms, and simultaneously, nitrogen can be removed well. At present, the denitrification deep bed filter tank is widely applied to sewage plants. After the existing denitrification deep bed filter structure and matched equipment are analyzed, a rotor pump is adopted to replace a centrifugal pump mainly in the back washing process.
1) The delivery flow of the rotor pump can be accurately controlled, and the variable displacement pump can be conveniently manufactured. The output flow of the centrifugal pump cannot be controlled and decreases with the increase of the resistance.
The denitrification deep bed filter is gravity type filtration, and meanwhile, because denitrification is to convert nitrate into nitrogen under the anoxic condition, longer contact time is needed. In the backwashing process, the control of the flow state of the filter layer is an important way for controlling the microbial biomass, so that the old biological membrane is uniformly dropped, the ultrathin biological membrane of the filter material is recovered, and the continuous updating of the biological membrane is kept, which is a key link for keeping the high-efficiency biological purification function of the biological filter for a long time.
The inlet water of the denitrification deep bed filter tank is generally secondary outlet water, the content of organic matters is low, and the thickness of the biological membrane is only about 1/10 in the common sewage treatment process. Therefore, the backwashing strength of the filter bed is different from that of the traditional sewage treatment and water supply treatment, and the filter bed does not need to be completely fluidized in the backwashing process, so that the backwashing water flow speed and the backwashing air flow speed can be reduced, the backwashing uniformity is more sensitive, and the process has higher requirements.
The rotor pump can accurately control the flow, the rotating speed of the pump is very low, the backwashing water is stably output, the backwashing water distribution is more uniform, an old biological membrane can be better dropped off, a certain amount of biological membrane can be maintained, and the treatment capacity of the filter tank can be recovered more quickly; the rotating speed of the centrifugal pump is very high, the output flow cannot be controlled, and the output flow is reduced along with the increase of the resistance, so that the backwashing water distribution uniformity is not high due to unstable flow and flow state in the backwashing process, a certain impact is caused on a biological film on a filter material, and the biological denitrification efficiency is influenced.
2) The rotor pump optimizes the design of the rotor profile, the pulsation is stable, the error is extremely small, the vibration is very small, and the efficiency is high; in the operation process of the denitrification deep bed filter tank, the main energy consumption points are a back washing water pump and an air blower, so that a rotor pump is selected, and the energy consumption is lower than that of a centrifugal pump.
3) In the existing manner, the later maintenance cost of the centrifugal pump is very high: the back flush water pump of the denitrification deep bed filter tank runs in a clearance mode, the pump is frequently started and stopped, the failure rate of the centrifugal pump is high, the rotor pump can rotate forwards and backwards, and the failure rate is low. Meanwhile, the later maintenance cost of the centrifugal pump is high, particularly accessories are needed to be removed from a station during maintenance, and the rotor pump can be directly maintained by removing the pump cover with tools on a production line.
4) The nitrogen removal problem can be flexibly solved: in the denitrification deep bed filter, nitrate is converted into nitrogen, nitrogen gas is contained in a filter material layer, and when the amount of the nitrogen gas is accumulated in excess of a certain proportion, an air resistance field can be generated, so that the difference between a filter channel and load is reduced, the biological contact area of the surface of the filter material is reduced, the biological purification function is reduced, water is slightly backflushed, the water is stabilized within two minutes, and the water pressure and the flow required by nitrogen displacement are smaller than those of backflushed water. At present, a denitrification deep bed filter is not provided with a nitrogen driving device independently, nitrogen is driven during back flushing, and nitrogen cannot be discharged in time in the mode. During normal filtration, the backwashing water pump is normally started to drive nitrogen, and due to the fact that the flow and the pressure of backwashing water are high, impact can be caused on a microbial membrane which normally runs, and the biological purification efficiency is affected. And the rotor pump is adopted, the flow of the pump can be accurately adjusted and controlled through the frequency conversion device, and the back flushing nitrogen removal is started in an interlocking manner through program control and automatic judgment.
SUMMERY OF THE UTILITY MODEL
Therefore, in order to solve the above-mentioned insufficiency, the utility model provides an improvement denitrification deep bed filtering pond here. The main energy consumption of the denitrification deep bed filter tank is the electricity consumption of a backwashing water pump and an air blower, and in the backwashing process, the control of the flow state of a filter layer is an important way for controlling the microbial biomass, so that an old biological membrane is uniformly dropped, an ultrathin biological membrane of a biological filter material is recovered, and the continuous updating of the biological membrane is kept, which is a key link for keeping a high-efficiency biological purification function of the biological filter tank for a long time, so that the selection of the backwashing water pump becomes particularly important.
The utility model discloses a realize like this, construct an improvement denitrification deep bed filtering pond, its characterized in that: comprises a filter tank, a filter tank water distribution channel, a water inlet, a drug adding and mixing area, a clean water tank, a back flush wastewater tank, a filter material, a back flush water pump and a blower;
the main water inlet pipe is communicated with a dosing mixing area, and the water inlet and dosing mixing area is communicated with a water distribution channel of the filter tank; a filter material is arranged in the filter chamber; the upper part of the filter is provided with a filter water distribution weir; the bottom of the filter tank is provided with water distribution gallery outlet water which is communicated with a clean water tank through a pipeline; an air pipe and filter bricks are arranged at the bottom of the filter tank;
an outlet pipe of the backwashing blower is connected with an air pipe at the bottom of the filter tank, air branch pipes are uniformly arranged at the bottom of the filter tank, and the air branch pipes are distributed below filter bricks at the bottom; the water outlet pipe of the back flush water pump is connected with the water outlet pipe of the filter tank.
According to the utility model relates to an improvement denitrification deep bed filtering pond, its characterized in that: and a stirring and mixing device is arranged in the water inlet and medicine adding mixing area.
According to the utility model relates to an improvement denitrification deep bed filtering pond, its characterized in that: the filter tank is of a rectangular structure; the filter material is quartz sand, the thickness of the filter material layer with the particle size of 2-3 mm is 1.85m, and the filter material cushion layer is made of natural pebbles.
According to the utility model relates to an improvement denitrification deep bed filtering pond, its characterized in that: wherein the back flush water pump is the rotor pump, arranges the piping lane between filtering pond and clean water basin to adopt the accurate water flow of adjusting of frequency conversion.
The utility model has the advantages of as follows: the utility model discloses denitrification deep bed filtering pond, back flush water pump wherein adopt the impeller pump, main advantage:
1) the structure is compact, and the occupied area is small;
2) the operation efficiency is high, and the energy is saved and the environment is protected;
3) the water outlet flow can be adjusted and accurately controlled, and the backwashing can be better adapted;
4) by adjusting the water outlet flow and pressure, the microbial biomass of the filter tank can be better maintained in the nitrogen displacement process, and the biological purification efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of the internal structure of the denitrification deep-bed filter of the present invention.
Wherein: the device comprises a filter 1, a filter water distribution channel 2, a water inlet and chemical adding mixing area 3, a clean water tank 4, a backwashing wastewater tank 5, filter materials 6, a backwashing water pump 7, a blower 8, a main water inlet pipe 9, a pipeline 10, a pipeline 11, a pipeline 12, a pipeline 13, a stirring and mixing device 14 and a gate 15.
Detailed Description
The present invention will be described in detail with reference to the accompanying fig. 1, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides an improvement denitrification deep bed filter with simple structure, good water purification effect and energy conservation. The utility model discloses the advanced treatment of mainly used sewage and carry mark transformation etc. provide the assurance for sewage factory goes out water quality of water. The device comprises a filter 1, a filter water distribution channel 2, a water inlet and dosing mixing region 3, a clean water tank 4, a backwashing wastewater tank 5, a filter material 6, a backwashing water pump 7, an air blower 8, a control system of the filter, air distribution, water distribution, connecting pipelines, valves and the like in the filter.
Wherein, the main water inlet pipe 9 is communicated with the chemical adding mixing area 3, and the water inlet and chemical adding mixing area 3 is communicated with the water distribution channel 2 of the filter tank; a filter material 6 is arranged in the filter 1; the upper part of the filter 1 is provided with a filter water distribution channel 2; the bottom of the filter 1 is provided with water distribution gallery outlet water which is communicated with a clean water tank 4 through a pipeline 10; an air pipe and filter bricks are arranged at the bottom of the filter 1;
an outlet pipe of the backwashing blower 8 is connected with an air pipe at the bottom of the filter tank, air branch pipes are uniformly distributed at the bottom of the filter tank, and the air branch pipes are distributed below filter bricks at the bottom; the water outlet pipe of the backwashing pump 7 is connected with the water outlet pipe of the filter tank.
Wherein, a stirring and mixing device 14 is arranged in the water inlet and medicine adding mixing area 3.
Wherein, the filter 1 is a rectangular structure; the filter material 6 is made of quartz sand, the thickness of the filter material layer with the particle size of 2-3 mm is 1.85m, and the filter material cushion layer is made of natural pebbles.
Wherein, back flush water pump 7 is the impeller pump, arranges the piping lane between filtering pond and clean water basin to adopt the accurate water flow of adjusting of frequency conversion. As in fig. 1, run-time; sewage enters a dosing mixing area 3 through a main water inlet pipe 9, relevant medicaments such as a carbon source and the like are selectively added at the position according to the water quality condition of inlet water, the mixture is stirred and mixed and then enters a water distribution channel 2, then enters a water distribution weir channel at the upper part of a filter tank 1, water is uniformly distributed through a water distribution weir and enters the filter tank, water flows through a filter material from top to bottom for purification treatment, water flows out of a water distribution gallery at the bottom of the filter tank and enters a clean water tank through a pipeline 10, and the filtering process is completed.
The filter is a gravity type filter, back washing is required to be carried out periodically, and a gas-water combined washing mode is adopted. The back washing system comprises a back washing water pump 7 and a blower 8, and an aeration pipe and filter bricks are arranged at the bottom of the filter tank for ensuring the uniformity of water distribution and gas distribution, and the air-water back washing process comprises the following steps:
a. independent air washing: and (3) lasting for 3min, connecting an outlet pipe of the backwashing air blower 8 with an air pipe at the bottom of the filter tank, arranging air vents on each air branch pipe at the bottom of the filter tank, distributing air under the filter bricks at the bottom, and performing air blasting after the air is distributed through the filter bricks.
b. Backwashing by air water at the same time: and (3) after 15min, starting a backwashing water pump, connecting a water outlet pipe of the backwashing pump with a water outlet pipe of the filter, closing a valve from the water outlet of the filter to a clean water tank during backwashing, opening a valve from a backwashing water pipe to the filter, and enabling backwashing water to enter a water distribution gallery at the bottom of the filter, wherein air and water are simultaneously backwashed.
c. The water is used alone for 5 min. At this time, the blower is turned off and only the backwash water pump is operated.
And backwashing makes water and gas flow reversely to the filter bed, backwashing wastewater enters the water distribution channel through the water distribution weir, during backwashing, the water inlet valve is closed, the backwashing wastewater drainage valve is opened, and the wastewater enters the backwashing wastewater pool 5 through the pipeline.
The filter control system comprises filter backwashing control, nitrogen displacement control, carbon source adding control and the like.
The backwash procedure is described above.
Nitrogen removal procedure: closing the water inlet valve and the water outlet valve, starting the back washing water pump, opening a back washing water valve, opening a waste water discharge valve, back washing for about 2-5 minutes, removing accumulated nitrogen, recovering the operation of the filter, and setting the time or controlling the liquid level in the nitrogen release process.
The carbon source feeding is controlled by adopting a front-back feedback closed loop feeding, a control system collects a water inlet flow signal, a water inlet nitronitrogen concentration signal and a water outlet nitronitrogen concentration signal, and the carbon source feeding is accurately controlled through conversion, so that the notification of the denitrification effect of the filter tank is ensured, and the risk of BOD (biochemical oxygen demand) increase of the water outlet caused by excessive carbon source feeding is avoided.
The utility model discloses denitrification deep bed filtering pond, wherein the filtering pond is the rectangle structure, and the filter material adopts quartz sand, and the 2~3mm filter material layer thickness of particle diameter is 1.85m, and the filter material bed course adopts natural cobble.
The utility model discloses denitrification deep bed filtering pond, wherein the back flush water pump is the impeller pump, arranges the piping lane between filtering pond and clean water basin to adopt the accurate water flow of adjusting of frequency conversion.
The utility model discloses a denitrification deep bed filter, wherein the control system of the filter comprises a switching and air-water backwashing process which automatically controls the normal filtration and backwashing of the filter; monitoring the quality of inlet and outlet water so as to control the adding amount of a carbon source; controlling the nitrogen scavenging process, etc.
The advantages and the beneficial effects of the patent are embodied; the utility model discloses denitrification deep bed filtering pond, back flush water pump wherein adopt the impeller pump, main advantage:
1) the structure is compact, and the occupied area is small;
2) the operation efficiency is high, and the energy is saved and the environment is protected;
3) the water outlet flow can be adjusted and accurately controlled, and the backwashing can be better adapted;
4) by adjusting the water outlet flow and pressure, the microbial biomass of the filter tank can be better maintained in the nitrogen displacement process, and the biological purification efficiency is improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. An improvement denitrification deep bed filtering pond which characterized in that: comprises a filter (1), a filter water distribution channel (2), a water inlet and medicine adding mixing area (3), a clean water tank (4), a backwashing wastewater tank (5), a filter material (6), a backwashing water pump (7) and a blower (8);
the main water inlet pipe (9) is communicated with the dosing mixing area (3), and the water inlet and dosing mixing area (3) is communicated with the water distribution channel (2) of the filter tank; a filter material (6) is arranged in the filter tank (1); the upper part of the filter tank (1) is provided with a filter tank water distribution weir plate; the bottom of the filter tank (1) is provided with water distribution gallery outlet water which is communicated with a clean water tank (4) through a pipeline (10); an air pipe and filter bricks are arranged at the bottom of the filter tank (1);
an outlet pipe of the backwashing blower (8) is connected with an air pipe at the bottom of the filter tank, air branch pipes are uniformly arranged at the bottom of the filter tank, and the air branch pipes are distributed below filter bricks at the bottom; the water outlet pipe of the back flush water pump (7) is connected with the water outlet pipe of the filter tank.
2. An improved denitrification deep bed filter according to claim 1, characterized in that: and a stirring and mixing device is arranged in the water inlet and medicine adding mixing area (3).
3. An improved denitrification deep bed filter according to claim 1, characterized in that: the filter tank (1) is of a rectangular structure; the filter material (6) is made of quartz sand, the thickness of the filter material layer with the particle size of 2-3 mm is 1.85m, and the filter material cushion layer is made of natural pebbles.
4. An improved denitrification deep bed filter according to claim 1, characterized in that: wherein back flush water pump (7) are the impeller pump, arrange the piping lane between filtering pond and clean water basin to adopt the accurate water flow of adjusting of frequency conversion.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921106737.6U CN210313696U (en) | 2019-07-16 | 2019-07-16 | Improved denitrification deep bed filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921106737.6U CN210313696U (en) | 2019-07-16 | 2019-07-16 | Improved denitrification deep bed filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113501577A (en) * | 2021-06-29 | 2021-10-15 | 中环保水务投资有限公司 | Horizontal flow denitrification filter tank system |
| CN114873722A (en) * | 2022-05-26 | 2022-08-09 | 苏州振禹环保科技有限公司 | Deep bed filter of denitrification of back flush intake pipe installation of burying end |
-
2019
- 2019-07-16 CN CN201921106737.6U patent/CN210313696U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113501577A (en) * | 2021-06-29 | 2021-10-15 | 中环保水务投资有限公司 | Horizontal flow denitrification filter tank system |
| CN114873722A (en) * | 2022-05-26 | 2022-08-09 | 苏州振禹环保科技有限公司 | Deep bed filter of denitrification of back flush intake pipe installation of burying end |
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