CN112759189A - A fire fighting equipment for sewage biochemical treatment - Google Patents
A fire fighting equipment for sewage biochemical treatment Download PDFInfo
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- CN112759189A CN112759189A CN202011599585.5A CN202011599585A CN112759189A CN 112759189 A CN112759189 A CN 112759189A CN 202011599585 A CN202011599585 A CN 202011599585A CN 112759189 A CN112759189 A CN 112759189A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
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- 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
- C02F3/02—Aerobic processes
Abstract
The invention relates to a defoaming device for sewage biochemical treatment, which comprises an aerobic pool, a sedimentation pool, a defoaming agent storage and a spraying pipeline, wherein the aerobic pool is connected with the sedimentation pool; the spraying pipeline comprises a main pipe and a plurality of branch pipes connected with the main pipe in parallel, the water inlet end of the main pipe is connected with the water outlet end of the water injector, the branch pipes are perpendicular to the direction of water flow in the aerobic tank and distributed in the inner space of the aerobic tank, and a plurality of nozzles are arranged on each branch pipe at intervals and used for spraying mixed liquid of defoaming agent and supernatant.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a defoaming device for biochemical sewage treatment.
Background
Along with the acceleration of the urbanization process, the living standard of people in cities and city circles is continuously improved, the amount of sewage generated by life or industry is also improved year by year, and the system has higher pressure and higher requirements on sewage treatment and energy recycling systems. The biological method sewage technology utilizes aerobic or anaerobic microorganisms to degrade organic pollutants in sewage, is energy-saving and environment-friendly, but the sewage with more organic pollutants, especially the garbage percolate always generates foams in the biological method treatment process, and if the foams are not treated in time, the foams overflow a biochemical pool to cause secondary pollution.
The traditional defoaming device for sewage treatment is used for extracting waste water in the aerobic tank as spraying circulating water, the circulating water directly sprays through a main water distribution pipeline arranged along the wall of the tank and a branch pipe used for spraying, and contacts and crushes foam with the foam in the aerobic tank, and the waste water after defoaming enters the aerobic tank for recycling. At the same time, defoaming agents are also used to perform chemical defoaming.
However, the conventional bubble removing apparatus has the following problems: (1) the waste water of the aerobic tank or other process steps is extracted, if the waste water is not filtered, the mud-water mixture enters a tail end nozzle, the nozzle is often blocked due to the large amount of sludge or sediments, and the nozzle is easily attached and blocked by the sludge in the circulating waste water when the nozzle runs for a long time; (2) for a large aerobic biochemical treatment tank or device, a single-point liquid level meter or a large foam scraping plate is usually adopted at present, the condition that the large foam scraping plate is started only by a few foams or the condition that the foams are not detected in time respectively exists, multi-point detection cannot be achieved, a defoaming device can be started in time, the foams overflow, the defoaming effect is influenced, and the energy consumption is large; (3) no matter traditional fire fighting equipment no matter is fountain defoaming, sprinkle the defoaming agent or the physics is scraped the bubble, adopts a plurality of liquid pump to carry different water usually, and moving part is more, and not only the energy consumption is big, breaks down easily moreover. (4) For a large-scale sewage biochemical treatment tank, the added defoaming agent has larger dosage and higher treatment cost.
Disclosure of Invention
Aiming at the problems, the invention provides a defoaming device which comprises an aerobic tank, a sedimentation tank, a defoaming agent storage and a spraying pipeline, wherein the aerobic tank is connected with the sedimentation tank;
the spraying pipeline comprises a main pipe and a plurality of branch pipes connected with the main pipe in parallel, the water inlet end of the main pipe is connected with the water outlet end of the water injector, the branch pipes are perpendicular to the direction of water flow in the aerobic tank and distributed in the inner space of the aerobic tank, and a plurality of nozzles are arranged on each branch pipe at intervals and used for spraying mixed liquid of defoaming agent and supernatant.
Optionally, the liquid level meters include a first liquid level meter and a second liquid level meter, the first liquid level meters are distributed near the spraying pipeline in the aerobic tank, and the foam generation position is monitored to guide the spraying position of the spraying pipeline; the second liquid level meter is arranged inside the sedimentation tank, so that the sludge is prevented from being sucked by the circulating pump when the sedimentation tank is at a low water level.
The defoaming device provided by the invention utilizes the supernatant of the sedimentation tank after the water is discharged from the aerobic tank as defoaming spray water, so that a large amount of water is saved, and in order to further solve the problem that a nozzle of a spray pipeline is easy to block, a filter is additionally arranged, so that the water quality of the defoaming spray water is improved; the first level gauge of a plurality of distributes near the spray pipe in the aerobic tank, can disperse the foam in the monitoring aerobic tank and produce the condition, realizes the fixed point or fixes a position the defoaming, practices thrift defoaming agent and defoaming shower water quantity to reduce the energy consumption of circulating pump, filter and water dart.
The aerobic tank is connected with the sedimentation tank through a pipeline, sewage after biological treatment enters the sedimentation tank for mud-water separation, supernatant is arranged at the upper part of the sedimentation tank, and solid matters contained in the supernatant are less, so that the primary treatment of the defoaming spray water is realized.
Optionally, the upper portion of sedimentation tank connects outlet conduit, and outlet conduit connects gradually circulating pump, filter, water dart and spraying pipeline, and the supernatant of sedimentation tank accomplishes the secondary treatment through the filter, effectively avoids spraying pipeline's shower nozzle to block up.
Preferably, the filter is a Y-shaped filter, and a filter screen of the Y-shaped filter is 50-60 meshes, so that most of solid substances can be effectively intercepted.
The water ejector is connected with a defoaming agent storage device through a pipeline, when defoaming agent needs to be added, the water ejector generates certain negative pressure, a certain amount of defoaming agent is sucked into the water ejector, is uniformly mixed with defoaming spray water conveyed from the filter, and is conveyed to the spraying pipeline. The invention uses the water ejector to replace the traditional medicament feeding pump, avoids using equipment containing moving parts and reduces the maintenance probability.
Optionally, the spray pipe way is including being responsible for and rather than a plurality of branch pipe of parallelly connected, the end of intaking of being responsible for connects the play water end of water dart, the rivers direction in the branch pipe perpendicular to aerobic tank, all branch pipes distribute along the rivers direction in the aerobic tank each other parallelly promptly, and the interval is equipped with a plurality of nozzle on every branch pipe for sprinkle the mixed liquid of defoaming agent and defoaming shower water.
Optionally, the nozzle is an adjustable spherical spiral nozzle, the spraying direction can be flexibly adjusted according to needs, liquid blockage is reduced, sprayed liquid drops are fine and dense, and a good dispersing effect can be achieved.
Optionally, a branch valve is arranged at the water inlet end of each branch pipe to control the water inlet of the corresponding branch pipe; each nozzle can be individually controlled to activate or deactivate.
Optionally, the plurality of first liquid level meters are distributed near the nozzles in the aerobic tank, and foam generation positions are monitored to guide the using amount of the defoaming agent and spraying positions of the spraying pipelines. Specifically, the range radii of all the nozzles are the same, the distance between two adjacent nozzles on the same branch pipe is the sum of the range radii of the two nozzles, the distance between two adjacent branch pipes is the sum of the range radii of the two nozzles, namely, four adjacent nozzles on the two branch pipes form a square, and the first liquid level meter is arranged at the center of the square. The disinfection device of the invention forms a circular spraying range by taking each nozzle as a circle center and taking the range radius of the nozzle as a radius, four adjacent nozzles on two branch pipes form four circular spraying ranges which are tangent to each other, the centers of spaces between the four circular spraying ranges are provided with the first liquid level meter, the range ranges of each nozzle are not overlapped and are tangent to each other, thus the design can utilize the range of the nozzle to the maximum extent and save the defoaming agent and defoaming spray water, however, the spaces between the four circular spraying ranges are outside the spraying range, namely the first liquid level meter is outside the spraying range.
Optionally, an aerator pipe parallel to each branch pipe is arranged below each branch pipe, a plurality of aeration holes are uniformly formed in the upper surface of each aerator pipe, and the aerator pipes are arranged at the bottom of the aerobic tank and used for providing oxygen or air to promote activated sludge and sewage disturbance. Each aeration pipe is provided with an air valve, and each aeration pipe can independently control whether to start aeration or not.
The branch pipes, the nozzles, the first liquid level meter and the aeration pipes are arranged in a matching way, so that the defoaming agent can also act on the space between the four circular spraying ranges of the first liquid level meter on the basis of ensuring that the spraying ranges of the nozzles are not overlapped, specifically, the direct acting range of the defoaming agent is the spraying range of the nozzles, the aeration pipe is arranged below each branch pipe, namely, the space between the four circular spraying ranges is also positioned between the two aeration pipes, when each aeration pipe is aerated, the sewage and the activated sludge can be pushed to the two sides of the aeration pipe, therefore, when two adjacent aeration pipes are aerated, the sewage is pushed to the space between the two aeration pipes, namely the sewage is pushed to the space between the four circular spraying ranges, thereby creating the indirect action range of the defoaming agent, and leading the indirect action range of the defoaming agent to be expanded to the space between the four circular spraying ranges. Through the design, the function range of the defoaming agent is expanded by utilizing the original aeration pipe.
Optionally, the first liquid level meter is a radio frequency admittance material level switch, when foam is generated, the liquid level changes, admittance values around the radio frequency admittance material level switch change correspondingly, the radio frequency admittance material level switch can sense the generation of the foam, and the radio frequency admittance material level switch can prevent hanging of the material, so that the defoaming device is a more reliable and more accurate novel material level control technology, and the defoaming device is higher in sensitivity and more accurate in positioning in the aspect of foam detection.
Optionally, the radio frequency admittance material level switch is installed at a height of 1.5-3 m above the liquid level, a triangular bracket is made of angle steel or channel steel, and the radio frequency admittance material level switch is installed in the aerobic tank in a multi-point mode according to the design, so that the foam height in the whole aerobic tank is monitored.
Optionally, the installation height of the nozzle is not higher than that of the radio frequency admittance level switch.
When a certain radio frequency admittance material level switch detects foam, the foam is fed back to the control system, the control system starts the circulating pump and the water ejector, and supernatant of the sedimentation tank passes through the Y-shaped filter, is mixed with the sucked defoaming agent in the water ejector and is conveyed to the branch pipe through a main pipe of the spraying pipeline; the control system opens the branch pipe valves of the left branch pipe and the right branch pipe corresponding to the foam position, opens four adjustable spherical spiral nozzles around the foam position, and controls the adjustable spherical spiral nozzles to spray in a semi-circle or circular mode according to the number of detected foam positions; the control system starts the gas valves of the two aeration pipes corresponding to the working branch pipes to start aeration, and the sprayed defoaming agent is pushed to foam sites in a matching manner.
Optionally, the water ejector is connected with the control system, and the size of the generated negative pressure can be controlled according to the number of the radio frequency admittance material level switches for detecting the foam, so that the using amount of the defoaming agent is controlled.
Optionally, in order to increase the accuracy that radio frequency admittance material level switch detected the foam, add at radio frequency admittance material level switch and establish the pressure gauge, no matter be in the air pressure above the liquid level, still be in the pressure of the sewage under the liquid level, after producing the foam, pressure all can change, and the cooperation pressure gauge detects pressure variation to judge whether produce the foam, as the replenishment to radio frequency admittance material level switch.
Optionally, the defoaming device further comprises a foam scraping plate, the foam scraping plate is arranged above the first liquid level meter and used for mechanically removing large-area foam, and preferably, the foam scraping plate is arranged above the first liquid level meter by 0.1-1 meter. In order to reduce energy consumption, the bubble scraping plate is activated when foam is generated in a large area, and preferably, when foam is detected by 1/3-1/2 number of first liquid level meters.
The second liquid level meter is arranged in the sedimentation tank and used for monitoring the liquid level height of the sedimentation tank and is connected with the control system, the control system starts the circulating pump and the water ejector after receiving signals of the first liquid level meter and/or the pressure gauge and sprays the defoaming agent into the aerobic tank, and after foam is eliminated, the circulating pump is turned off in a delayed mode and stops working; when the time delay device goes wrong, the circulating pump may operate all the time, the liquid level of the sedimentation tank continuously decreases, when the liquid level is reduced to the low liquid level set by the second liquid level meter, the control system sends a stop command, the circulating pump stops, and sludge is prevented from entering the circulating pump, so that the purpose of protecting the circulating pump is achieved.
Optionally, the defoaming device still includes clean water basin and third level gauge, and the clean water basin is established at the downstream side of sedimentation tank to through pipe connection sedimentation tank, the outlet conduit of clean water basin connects the circulating pump, third level gauge set up in the clean water basin and monitor its liquid level height, third level gauge connection control system. Supernatant in the sedimentation tank is input into the clean water basin, is subsided for the second time, stores the supernatant simultaneously, and the effect of third level gauge is the same with the second level gauge, and when the intaking of circulating pump came from the clean water basin, third level gauge cooperation control system prevented that the circulating pump from changeing futilely.
Optionally, the second liquid level meter and the third liquid level meter are both ultrasonic liquid level meters, and influence caused by liquid viscosity, density and the like can be avoided by adopting non-contact measurement.
Optionally, the fire fighting equipment still includes control system, and control system includes the PLC controller, and the PLC controller communication is connected first level gauge, pressure gauge, scrape bubble board, branch pipe valve, nozzle, water dart, circulating pump, second level gauge and third level gauge to be equipped with built-in procedure, receive the signal of first level gauge, pressure gauge, start or stop scraping bubble board, branch pipe valve, nozzle, water dart, the work of circulating pump, and through the signal of second level gauge and third level gauge, the protection circulating pump in time stops working.
The defoaming device provided by the invention has the following advantages:
1. the water source adopted for defoaming is supernatant liquid after water outlet sedimentation of the aerobic tank, so that suspended matters are few, and a nozzle is not easy to block;
2. the branch pipes of the spraying pipeline are distributed in the inner space of the aerobic tank, and the nozzles are arranged, so that the defoaming agent can be directly sprayed at the foam position in the aerobic tank, and the defoaming efficiency is high;
3. the water ejector replaces an original defoaming agent adding pump, and the whole defoaming device only uses a circulating pump as a moving part, so that the moving parts are reduced, the power consumption is low, and the system operation failure rate is reduced;
4. the radio frequency admittance material level switch for detecting foam is arranged in a multi-point mode, so that the foam in different areas in the aerobic tank can be effectively detected when the tank body is large, and the problems of untimely defoaming and foam overflow caused by interference on foam liquid level monitoring and inaccurate and uneven monitoring due to the overlarge tank body of the aerobic tank are avoided;
5. the unique design of the position relation of the radio frequency admittance material level switch, the nozzle and the aeration pipe, provided by the invention, can comprehensively and accurately monitor the bubble condition in the aerobic tank, and can rationalize the spraying coverage of the defoaming agent, save the defoaming agent and improve the defoaming efficiency;
6. the defoaming device is high in automation degree, the circulating pump and the water ejector are automatically started and closed according to the foam detection condition of the first liquid level meter, the water ejector provides different negative pressures to feed a proper amount of defoaming agent, manual management is not needed, and only the defoaming agent needs to be supplemented or replaced regularly.
Drawings
FIG. 1 is a schematic structural view of the defoaming apparatus for biochemical treatment of wastewater according to example 1.
FIG. 2 is a schematic structural diagram of the defoaming device for biochemical treatment of wastewater according to embodiment 2.
Fig. 3 is a side view of the aerobic tank.
FIG. 4 is a schematic structural view of the defoaming device for biochemical treatment of wastewater according to embodiment 3.
In the attached figure, 1-an aerobic tank, 2-a sedimentation tank, 3-a filter, 4-a spraying pipeline, 401-a main pipe, 402-a branch pipe, 403-a nozzle, 5-a water ejector, 6-an antifoaming agent storage, 7-a circulating pump, 8-a first liquid level meter, 9-a second liquid level meter, 10-an aeration pipe, 11-a foam scraping plate, 12-a pressure gauge, 13-a clean water tank and 14-a third liquid level meter.
Detailed Description
Example 1
The defoaming device for sewage biochemical treatment described in this embodiment, as shown in fig. 1, includes an aerobic tank 1, a sedimentation tank 2, a filter 3, a water ejector 5 connected to a defoaming agent storage 6, and a spraying pipeline 4, where the aerobic tank 1 is connected to the sedimentation tank 2, the sedimentation tank 2 is connected to the spraying pipeline 4 sequentially through a circulating pump 7, the filter 3, and the water ejector 5, the circulating pump 7 inputs the supernatant of the sedimentation tank 2 into the water ejector 5, and the water ejector 5 sucks the defoaming agent and mixes with the supernatant and inputs the mixture into the spraying pipeline 4.
The spraying pipeline 4 comprises a main pipe 401 and five branch pipes 402 connected in parallel with the main pipe 401, the water inlet end of the main pipe 401 is connected with the water outlet end of the water ejector 5, the branch pipes 402 are perpendicular to the water flow direction in the aerobic tank 1 and are distributed in the inner space of the aerobic tank 1, and six nozzles 403 are arranged on each branch pipe 402 at intervals and used for spraying a mixed liquid of an antifoaming agent and a supernatant.
Example 2
The defoaming device for sewage biochemical treatment described in this embodiment, as shown in fig. 2 and 3, includes an aerobic tank 1, a sedimentation tank 2, a filter 3, a spraying pipeline 4 and a water injector 5 connected to a defoamer storage 6, the aerobic tank 1 is connected to the sedimentation tank 2 through a pipeline, sewage after biological treatment enters the sedimentation tank 2 for mud-water separation, and the upper part of the sedimentation tank is supernatant. The upper part of the sedimentation tank 2 is connected with a water outlet pipeline, the sedimentation tank 2 is connected with a spraying pipeline 4 through a circulating pump 7, a filter 3 and a water injector 5 in sequence, the circulating pump 7 inputs the supernatant of the sedimentation tank 2 into the water injector 5, and the water injector 5 sucks in the defoaming agent, mixes the defoaming agent with the supernatant and inputs the mixture into the spraying pipeline 4; the supernatant of the sedimentation tank 2 is processed for the second time through the filter 3, so that the blockage of a spray head of the spray pipeline 4 is effectively avoided. The filter 3 is a Y-shaped filter, and the filter screen of the Y-shaped filter is 60 meshes.
The spraying pipeline 4 is connected and introduced into the aerobic tank 1, and defoaming agents are sprayed; the spraying pipeline 4 comprises a main pipe 401 and four branch pipes 402 connected in parallel with the main pipe 401, the water inlet end of the main pipe 401 is connected with the water outlet end of the water ejector 5, the branch pipes 402 are perpendicular to the water flow direction in the aerobic tank 1, and three nozzles 403 are arranged on each branch pipe 402 at intervals and used for spraying a mixed liquid of a defoaming agent and defoaming shower water (namely supernatant). The nozzle 403 is an adjustable spherical spiral nozzle, and the spraying direction can be flexibly adjusted according to needs.
The first liquid level meter 8 is distributed near the spraying pipeline 4 in the aerobic tank 1, and the foam generation position is monitored to guide the spraying position of the defoaming agent. The second liquid level meter 9 is arranged inside the sedimentation tank 2, and prevents the circulating pump 7 from sucking sludge when the sedimentation tank 2 is at a low water level.
A branch pipe valve is arranged at the water inlet end of each branch pipe 402 to control the water inlet of the corresponding branch pipe; each nozzle 403 may be individually controlled for activation or not.
The throw radii of all the nozzles 403 are the same, the distance between two adjacent nozzles 403 on the same branch pipe 402 is the sum of the throw radii of the two nozzles 403, and the distance between two adjacent branch pipes 402 is the sum of the throw radii of the two nozzles 403, i.e. four adjacent nozzles 403 on the two branch pipes 402 form a square, and a first liquid level meter 8 is arranged in the center of the square.
The aeration pipe 10 parallel to the branch pipes 402 is arranged below each branch pipe 402, a plurality of aeration holes are uniformly formed in the upper surface of each aeration pipe 10, each aeration pipe 10 is arranged at the bottom of the aerobic tank 1, each aeration pipe 10 is provided with a gas valve, and each aeration pipe 10 can be independently controlled to start aeration or not.
The first liquid level meter 8 is a radio frequency admittance material level switch, when foam is generated, the liquid level changes, admittance values around the radio frequency admittance material level switch correspondingly change, and the radio frequency admittance material level switch can sense the generation of the foam.
The radio frequency admittance material level switch is arranged at the height of 1.5 m above the liquid level, a triangular bracket is made of angle steel, and the radio frequency admittance material level switch is arranged in the aerobic tank 1 in a multi-point mode according to the design, so that the foam height in the whole aerobic tank 1 is monitored. The nozzle 403 is mounted at the same height as the rf admittance level switch.
When a certain radio frequency admittance material level switch detects foam, the foam is fed back to a control system, the control system starts a circulating pump 7 and a water ejector 5, supernatant of the sedimentation tank 2 passes through the Y-shaped filter 3, is mixed with an inhaled defoaming agent in the water ejector 5, and is conveyed to a branch pipe 402 through a main pipe 401 of a spraying pipeline; the control system opens the branch pipe valves of the left and right branch pipes 402 corresponding to the foam position, opens four adjustable spherical spiral nozzles around the foam position, and controls the adjustable spherical spiral nozzles to spray in a semi-circle or circumference mode according to the number of detected foam positions; the control system starts the gas valves of the two aeration pipes 10 corresponding to the working branch pipes to start aeration, and the sprayed defoaming agent is pushed to foam sites in a matching manner.
The water ejector 5 is connected with a control system, and can control the size of the generated negative pressure according to the number of the radio frequency admittance material level switches for detecting foam, thereby controlling the dosage of the absorbed defoaming agent.
The defoaming device further comprises a foam scraping plate 11, wherein the foam scraping plate 11 is arranged above the first liquid level meters 8 for 0.5 meter and used for mechanically removing large-area foam, the foam scraping plate 11 is connected with a control system, and when the first liquid level meters 8 in 1/3-1/2 detect foam, the control system starts the foam scraping plate 11.
The second liquid level meter 9 is an ultrasonic liquid level meter, is arranged inside the sedimentation tank 2 and is used for monitoring the liquid level height of the sedimentation tank and is connected with a control system, after the control system receives a signal of the first liquid level meter 8, the circulating pump 7 and the water ejector 5 are started, a defoaming agent is sprayed into the aerobic tank 1, and after foam is eliminated, the circulating pump 7 is turned off in a delayed manner and stops working; when the time delay device goes wrong, the circulating pump 7 may run all the time, the liquid level of the sedimentation tank 2 continuously decreases, when the liquid level is lowered to the low liquid level set by the second liquid level meter 9, the control system sends a stop command, the circulating pump 7 stops, and sludge is prevented from entering the circulating pump 7, so that the purpose of protecting the circulating pump 7 is achieved.
Defoaming device still includes control system, and control system includes the PLC controller, and first level gauge 8 is connected in the PLC controller communication, scrapes bubble board 11, branch pipe valve, nozzle 403, water dart 5, circulating pump 7 and second level gauge 9 to be equipped with built-in procedure, receive the signal of first level gauge 8, start or stop scraping the work of bubble board 11, branch pipe valve, nozzle 403, water dart 5, circulating pump 7, and through the signal of second level gauge 9, protect circulating pump 7 in time stop work.
Example 3
The defoaming device for sewage biochemical treatment described in this embodiment, as shown in fig. 3 and 4, adds a pressure gauge 12 at the rf admittance level switch, where the pressure gauge is connected to the control system as a supplement to the rf admittance level switch.
The defoaming device also comprises a clean water tank 13 and a third liquid level meter 14, wherein the clean water tank 13 is arranged at the downstream side of the sedimentation tank 2 and is connected with the sedimentation tank 2 through a pipeline, a water outlet pipeline of the clean water tank 13 is connected with the circulating pump 7, the third liquid level meter 14 is arranged in the clean water tank 13 and monitors the liquid level height of the third liquid level meter, the third liquid level meter 14 is an ultrasonic liquid level meter, and the third liquid level meter 14 is connected with a control system. Supernatant in the sedimentation tank 2 is input into the clean water tank 13, secondary sedimentation is carried out, the supernatant is stored simultaneously, the effect of the third liquid level meter 14 is the same as that of the second liquid level meter 8 in the embodiment 1, and when the inlet water of the circulating pump 7 comes from the clean water tank 13, the third liquid level meter 14 is matched with a control system to prevent the circulating pump 7 from dry rotation.
The second liquid level meter 8 is not provided in this embodiment, and other components and connection relationships in this embodiment are the same as those in embodiment 2.
Claims (10)
1. A defoaming device for sewage biochemical treatment comprises an aerobic tank, a sedimentation tank, a defoaming agent storage and a spraying pipeline, wherein the aerobic tank is connected with the sedimentation tank;
the spraying pipeline comprises a main pipe and a plurality of branch pipes connected with the main pipe in parallel, the water inlet end of the main pipe is connected with the water outlet end of the water injector, the branch pipes are perpendicular to the direction of water flow in the aerobic tank and distributed in the inner space of the aerobic tank, and a plurality of nozzles are arranged on each branch pipe at intervals and used for spraying mixed liquid of defoaming agent and supernatant.
2. The defoaming apparatus according to claim 1, wherein the defoaming apparatus comprises a first liquid level meter and a second liquid level meter, a plurality of the first liquid level meters are distributed near the spraying pipeline in the aerobic tank, and the foam generation position is monitored to guide the spraying position of the spraying pipeline; the second liquid level meter is arranged inside the sedimentation tank, so that the sludge is prevented from being sucked by the circulating pump when the sedimentation tank is at a low water level.
3. The defoaming apparatus according to claim 2, wherein the nozzle is an adjustable spherical spiral nozzle, and a branch valve is arranged at the water inlet end of each branch pipe to control the water inlet of the corresponding branch pipe; each nozzle can be individually controlled to activate or deactivate.
4. The defoaming apparatus according to claim 3, wherein the range radii of all the nozzles are the same, the distance between two adjacent nozzles on the same branch pipe is the sum of the range radii of the two nozzles, the distance between two adjacent branch pipes is the sum of the range radii of the two nozzles, four adjacent nozzles on the two branch pipes form a square, and the first liquid level meter is arranged at the center of the square.
5. The defoaming device according to claim 4, wherein an aeration pipe is arranged below each branch pipe in parallel, a plurality of aeration holes are uniformly formed in the upper surface of the aeration pipe, and the aeration pipe is arranged at the bottom of the aerobic tank; each aeration pipe is provided with an air valve, and each aeration pipe can independently control whether to start aeration or not.
6. The bubble removal apparatus of claim 4, wherein the first level gauge is a radio frequency admittance level switch mounted at a height of 1.5-3 meters above a liquid level, and the nozzle is mounted at a height no greater than the mounting height of the radio frequency admittance level switch.
7. The defoaming apparatus according to claim 1, wherein the upper part of the sedimentation tank is connected with a water outlet pipeline, and the water outlet pipeline is sequentially connected with the circulating pump, the filter, the water ejector and the spraying pipeline; the filter is a Y-shaped filter.
8. The defoaming apparatus according to claim 6, wherein a pressure gauge is provided at the radio frequency admittance level switch to increase the accuracy of the radio frequency admittance level switch for foam detection;
the defoaming device further comprises a foam scraping plate, the foam scraping plate is arranged above the first liquid level meter and used for mechanically removing large-area foam, and the foam scraping plate is arranged above the first liquid level meter by 0.1-1 meter.
9. The defoaming apparatus of claim 8, further comprising a clean water tank disposed at a downstream side of the sedimentation tank and connected to the sedimentation tank by a pipe, an outlet pipe of the clean water tank being connected to the circulation pump, and a third level gauge disposed in the clean water tank and monitoring a liquid level thereof.
10. The defoaming apparatus according to claim 9, further comprising a control system, wherein the control system comprises a PLC controller, the PLC controller is in communication connection with the first liquid level meter, the pressure gauge, the foam scraping plate, the branch valve, the nozzle, the water ejector, the circulating pump, the second liquid level meter and the third liquid level meter, and is provided with a built-in program, receives signals of the first liquid level meter and the pressure gauge, starts or stops the operation of the foam scraping plate, the branch valve, the nozzle, the water ejector and the circulating pump, and protects the circulating pump from stopping operation in time through the signals of the second liquid level meter and the third liquid level meter.
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