CN217437927U - Oxidation and dissolved air flotation device - Google Patents
Oxidation and dissolved air flotation device Download PDFInfo
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- CN217437927U CN217437927U CN202220975372.6U CN202220975372U CN217437927U CN 217437927 U CN217437927 U CN 217437927U CN 202220975372 U CN202220975372 U CN 202220975372U CN 217437927 U CN217437927 U CN 217437927U
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Abstract
The embodiment of the application provides an oxidation and dissolved air flotation device, includes: the flocculation area is suitable for receiving sewage to be treated, a gas release device is arranged at the bottom of the flocculation area and is suitable for releasing oxidizing gas to oxidize substances needing to be oxidized in the sewage to be treated so as to obtain oxidized sewage; and the air flotation contact area is communicated with the flocculation area, is suitable for receiving the oxidized sewage, and is provided with an air dissolving release device which is suitable for releasing air flotation gas combined with suspended particles in the oxidized sewage to float the suspended particles to obtain the particle floating sewage. It can be seen that the oxidation and dissolved air flotation device that this application embodiment provided, through the gas release device that the flocculation area bottom set up, release oxidizing gas in the flocculation area, utilize rivers longer characteristic of dwell time in the flocculation area, can prolong the oxidation time to pending sewage, improve the degradation effect of organic matter COD in pending sewage.
Description
Technical Field
The embodiment of the application relates to the field of water treatment, in particular to an oxidation and dissolved air floatation device.
Background
Dissolved air floatation is a high-efficiency and quick solid-liquid separation process. The dissolved air flotation can use oxidizing gas to replace air in the traditional dissolved air flotation process as an air source for generating micro bubbles, and the oxidizing gas is used for oxidizing substances to be oxidized in organic matters waiting for sewage treatment, so that the Chemical Oxygen Demand (COD) and Total Phosphorus (TP) of the sewage to be treated are reduced, and meanwhile, the dissolved air flotation is realized by using the oxidizing gas to remove suspended particles, so that suspended matters (SS) are reduced, and the aim of purifying the sewage to be treated is fulfilled.
However, the existing process of replacing air in the traditional dissolved air floatation process with oxidizing gas as a gas source for generating micro bubbles is not mature, has the technical problem of unsatisfactory oxidation effect of substances to be oxidized in sewage to be treated, and is rarely applied in practice.
Therefore, how to enhance the oxidation effect of substances to be oxidized in sewage to be treated in the dissolved air flotation process becomes a technical problem which needs to be solved by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the embodiment of the application is how to enhance the oxidation effect of an oxidizing gas dissolved air flotation process on substances (COD) to be oxidized in sewage to be treated.
In order to solve the above technical problem, an embodiment of the present application provides an oxidation and dissolved air flotation device, including:
the flocculation area is suitable for receiving sewage to be treated, and the bottom of the flocculation area is provided with a gas release device which is suitable for releasing oxidizing gas to oxidize substances to be oxidized in the sewage to be treated so as to obtain oxidized sewage;
and the air flotation contact area is communicated with the flocculation area, is suitable for receiving the oxidized sewage, and is provided with an air dissolving and releasing device which is suitable for releasing air flotation gas combined with suspended particles in the oxidized sewage to air-float the suspended particles so as to obtain the particle floating sewage.
Optionally, the method further comprises:
and the air floatation separation area is communicated with the air floatation contact area and is suitable for receiving the floating sewage of the particles, the bottom of the air floatation separation area is provided with an outlet water collecting pore plate, and the hole distance of the water outlet hole of the outlet water collecting pore plate is gradually increased along the water flow direction.
Optionally, the aperture of the water outlet hole gradually decreases along the water flow direction.
Optionally, the method further comprises:
and the water inlet retaining wall is arranged between the air floatation contact area and the air floatation separation area, and the upper part of the water inlet retaining wall inclines to the air floatation separation area.
Optionally, the flocculation area is further provided with at least two groups of flocculation grid plates, each group of flocculation grid plates are arranged along the water flow direction, and the inclination directions of the grid strips on two adjacent groups of flocculation grid plates are opposite.
Optionally, the method further comprises:
the mechanical slag scraper is arranged above the air floatation separation area and is suitable for separating the suspended particles;
and the water outlet liquid level adjusting device is arranged between the air floatation separation area and the water outlet area communicated with the air floatation separation area and is suitable for adjusting the height of the water outlet liquid level.
Optionally, the gas release means comprises aeration means.
Optionally, the method further comprises:
and the gas pressurizing device is communicated with the dissolved gas releasing device and is suitable for increasing the pressure of the dissolved gas released by the dissolved gas releasing device.
Optionally, the method further comprises:
and the gas collecting hood is suitable for collecting the unreacted oxidizing gas.
Optionally, the gas-collecting hood covers above a sewage flow treatment area of the oxidation and dissolved air floatation device, and the sewage flow treatment area comprises the flocculation area, the floatation contact area, the floatation separation area and the water outlet area.
Compared with the prior art, the technical scheme of the embodiment of the application has the following advantages:
the oxidation and dissolved air flotation device provided by the embodiment of the application comprises a flocculation area, a gas release device and a water treatment device, wherein the flocculation area is suitable for receiving sewage to be treated, the bottom of the flocculation area is provided with the gas release device, and the gas release device is suitable for releasing oxidizing gas to oxidize substances to be oxidized in the sewage to be treated to obtain oxidized sewage; and the air flotation contact area is communicated with the flocculation area, is suitable for receiving the oxidized sewage, and is provided with an air dissolving release device which is suitable for releasing air flotation gas combined with suspended particles in the oxidized sewage to float the suspended particles to obtain the particle floating sewage. Therefore, when the sewage to be treated flows to the flocculation area for flocculation, the oxidizing gas released by the gas release device moves upwards from the bottom of the sewage to be treated in the form of bubbles, and substances needing to be oxidized in the sewage to be treated, which is in contact with the sewage to be treated in the oxidation movement process, change the sewage to be treated into oxidized sewage, then flow into the air flotation contact area, and then carry out air flotation treatment and air flotation on suspended particles.
Therefore, the oxidation and dissolved air flotation device provided by the embodiment of the application releases oxidizing gas in the flocculation zone through the gas release device arranged at the bottom of the flocculation zone, and can prolong the oxidation time of the sewage to be treated and improve the degradation effect of organic matter COD in the sewage to be treated by utilizing the characteristic that water flow stays for a long time in the flocculation zone. And after new suspended particles generated by the oxidized substances enter the air floatation contact zone, solid-liquid separation can be realized at the same time, and the treatment effect of the sewage to be treated is improved. The oxidizing gas released by the gas release device also has a certain air floatation function, so that the air floatation effect can be improved. Meanwhile, the change of the oxidation and dissolved air floatation device by arranging the gas release device at the bottom of the flocculation area is very small, so that the increase of the floor area of the oxidation and dissolved air floatation device and the extension of the water treatment time can be avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of an oxidation and dissolved air flotation apparatus according to an embodiment of the present disclosure.
Wherein: 1-a coagulation zone; 2-a flocculation zone; 21-a gas release device; 22-a flocculation grid; 31-an air flotation contact zone; 311-water inflow retaining wall; 312-a dissolved air release device; 32-air flotation separation zone; 321-an effluent collection well plate; 322-water outlet; 4-water outlet area; 5-a gas pressurization device; 6-dissolved air tank; 7-effluent liquid level regulating device; 8, mechanically scraping the slag machine; 9-a gas-collecting hood; 10-a tail gas elimination device; 110-a water inlet area; 120-oxidizing gas generating means; 121-total flow meter; 123-dissolved air regulating valve; 124-dissolved gas flow meter; 125-oxidizing gas regulating valve; 126-an oxidation flow meter; 130-reflux dissolved air booster pump; 131-reflux dissolved gas flowmeter.
Detailed Description
The oxidation and dissolved air flotation device generally comprises a water inlet area, a coagulation area, a flocculation area, an air flotation contact area, an air flotation separation area and a water outlet area, wherein the water inlet area is used for realizing that sewage to be treated enters the oxidation and dissolved air flotation device, the coagulation area is provided with a coagulation agent adding pipe suitable for adding a coagulation agent, the sewage to be treated entering from the water inlet area is fully mixed with the added agent in the coagulation area and then flows to the flocculation area, the flocculation area is provided with a flocculation agent adding pipe suitable for adding the flocculation agent, water flow fully reacts with the agent in the flocculation area to form flocs (suspended particles) and then flows into the air flotation contact area, the water flow enters the air flotation separation area after being subjected to dissolved air flotation and oxidation through microbubbles formed by oxidizing gas, and then enters the water outlet area after being subjected to solid-liquid separation in the air flotation separation area.
The air supporting contact zone is provided with dissolved air release, can release a large amount of microbubbles, each part in the microbubble utilizes the big characteristic transmission of self surface area and shifts rivers, the material that need be oxidized in oxidation rivers, when reducing Chemical Oxygen Demand (COD) and Total Phosphorus (TP), adhesion suspended particles (including the floc), make suspended particles in the rivers float to the rivers surface along with the microbubble and become the dross, realize solid-liquid separation, reduce Suspended Solid (SS), thereby reach the purification treatment purpose of treating the processing sewage. Wherein, the Chemical Oxygen Demand (COD) is the amount of reducing substances needing to be oxidized in the water sample measured by a chemical method; the total phosphorus TP is the mg of phosphorus contained in each liter of water sample which is measured after phosphorus in various forms is converted into orthophosphate in the water sample after digestion; suspended matter SS is the abbreviation for suspended matter (suspended solids) in the water environment research and treatment.
However, in the above treatment process, the time for the microbubbles in the floatation separation zone to float to the surface is too short, and the effective contact reaction time of the oxidizing gas and the substances to be oxidized in the sewage to be treated is short, so that the contact time required for sufficient oxidation is not achieved. Therefore, the COD of the sewage to be treated can not be effectively reduced by the existing dissolved air floatation process, and the effluent quality can not meet the new standards of drinking water quality and sewage discharge water quality.
In order to solve the foregoing problems, an oxidation and Dissolved Air Flotation device (oxy daf) is provided in the embodiments of the present application, and specifically, refer to fig. 1, where fig. 1 is the oxidation and Dissolved Air Flotation device provided in the embodiments of the present application.
As shown in fig. 1, an oxidation and dissolved air flotation device (OxyDAF) provided in the embodiment of the present application includes:
the flocculation area 2 is suitable for receiving sewage to be treated, a gas release device 21 is arranged at the bottom of the flocculation area, and the gas release device 21 is suitable for releasing oxidizing gas to oxidize substances to be oxidized in the sewage to be treated to obtain oxidized sewage;
the air flotation contact area 31 is communicated with the flocculation area 2, is suitable for receiving the oxidized sewage, and is provided with an air dissolution release device 312, wherein the air dissolution release device 312 is suitable for releasing air flotation gas combined with suspended particles in the oxidized sewage, so as to air float the suspended particles, and obtain the particle floating sewage.
It is easy to understand that the substances to be oxidized in the wastewater to be treated described herein are substances, including organic substances, that increase the COD value in the wastewater to be treated. Because organic matters in the sewage to be treated breed microorganisms and algae, the water quality is deteriorated, and the main reason for higher COD is also caused, the oxidizing gas described herein refers to a gas capable of oxidizing the organic matters in the sewage to be treated at normal temperature, and in a specific embodiment, the oxidizing gas may be ozone; the suspended particulate matters refer to impurities which can be subjected to solid-liquid separation by air floatation, and comprise flocs formed after coagulation and flocculation.
It is easy to understand that the flocculation zone 2 is used for fully reacting the sewage to be treated with the medicament, the water flow residence time is usually longer, and in particular, the water flow residence time at the flocculation zone 2 can be 10 minutes to 20 minutes. Therefore, the released oxidizing gas can have longer effective contact time with the substances needing to be oxidized in the water flow, so that the contact time of the water flow with the oxidizing gas in the whole oxidation and dissolved air floatation device is prolonged.
In one embodiment, the gas releasing means 21 may be provided at the front of the flocculation zone 2 in the water flow direction, so that the contact time of the oxidizing gas with the sewage to be treated can be further extended.
Thus, while the water flowing through the flocculation zone 2 is flocculated, substances to be oxidized in the sewage to be treated are oxidized by the oxidizing gas released by the gas release device 21 arranged at the bottom of the flocculation zone 2, and the oxidizing gas and the sewage to be treated can have a longer contact time.
Certainly, as shown in the figure, the oxidation and dissolved air flotation device provided in the embodiment of the present application may further include a coagulation area 1, where the coagulation area 1 is disposed in front of the coagulation area 1 and is provided with a coagulant feeding pipe suitable for feeding a coagulant, so that the sewage to be treated flows into the coagulation area 1 before flowing into the flocculation area 2, and thus the coagulant can be fed into the coagulation area 1 to perform coagulation treatment on the sewage to be treated, so as to meet the subsequent flocculation requirement.
Of course, in other embodiments, the wastewater to be treated flowing into the flocculation zone 2 can be coagulated with a coagulant in other wastewater treatment tanks.
In order to perform the coagulation more fully, in some embodiments, the coagulation area 1 may include two stages of mixing tanks connected in series to ensure the coagulation effect, and a coagulation stirring device may be further disposed in the coagulation tank, and in particular, may include two stages of coagulation stirring devices.
Of course, in one embodiment, the oxidation and dissolved air flotation device provided in the embodiments of the present disclosure may further include a water inlet region 110, and the water inlet region 110 may include a water inlet weir, so as to better control the water inlet speed.
Through the flocculation area 2, the substances to be oxidized in the sewage to be treated are oxidized, the oxidized substances are partially dissolved in water and partially converted into new suspended particles, so that the oxidized sewage is received by the air floatation contact area 31 communicated with the flocculation area 2, and the suspended particles in the sewage to be treated and the newly converted suspended particles are subjected to air floatation together.
It should be noted that the dissolved air releasing device 312 is added at the bottom of the flocculation zone 2, and no separate oxidation zone is added, so that the expansion of the floor area of the oxidation and dissolved air floatation device and the extension of the water treatment time can be prevented.
Of course, since the gas always floats from bottom to top to the surface of the water, the gas discharge means 21 is placed at the bottom of the flocculation zone 2 in order to prevent incomplete oxidation of the water area below the gas discharge means 21.
It is to be understood that the gas releasing device 21 may be a device that generates and releases the oxidizing gas, or may be a device that is connected to an oxidizing gas source and releases only the oxidizing gas. Of course, when the gas releasing means 21 is a means for performing the release of the oxidizing gas, the gas is transferred from the top of the flocculation zone 2 to the bottom of the flocculation zone 2 in order to prevent the sewage to be treated from flowing backward into the gas releasing means 21.
In some embodiments, the dissolved air released from the dissolved air releasing device 312 disposed in the air contact zone 31 and combined with the suspended particles in the oxidized sewage may be an oxidizing gas, so that the requirement for the retention time of the water flow in the flocculation zone 2 is reduced by further oxidation during the dissolved air flotation process, thereby further improving the efficiency of the purification treatment; in other embodiments, the dissolved air released from the dissolved air releasing device 312 and combined with the suspended particles in the oxidized sewage can be non-oxidizing gas, and it is understood that when the retention time of the water flow in the flocculation zone 2 has been sufficient for sufficient oxidation, and the oxidized sewage flowing out from the flocculation zone 2 has been sufficiently oxidized, the dissolved air is then subjected to the dissolved air using the non-oxidizing gas (such as air) so as to reduce the cost of the purification treatment.
It can be seen that the oxidation and dissolved air flotation device provided by the embodiment of the application releases oxidizing gas in the flocculation area 2 through the gas release device 21 arranged at the bottom of the flocculation area 2, and can prolong the oxidation time of the sewage to be treated and improve the degradation effect of organic matter COD in the sewage to be treated by utilizing the characteristic that the retention time of water flow in the flocculation area 2 is longer. And after new suspended particles generated by the oxidized substances enter the air floatation contact zone 31, solid-liquid separation can be realized at the same time, and the treatment effect of the sewage to be treated is improved. Of course, the oxidizing gas released by the gas releasing device 21 also has a certain air floating function, so that the air floating effect can be improved. Meanwhile, the gas release device 21 arranged at the bottom of the flocculation area 2 has little change on the oxidation and dissolved air floatation device, and can avoid the increase of the floor area of the oxidation and dissolved air floatation device and the extension of the water treatment time.
In one embodiment, in order to better extend the oxidation range of the oxidizing gas, the gas releasing device 21 may be an aeration device located at the bottom of the flocculation zone 2, connected to a gas pipe that transfers the oxidizing gas from the top of the flocculation zone 2 to the bottom of the flocculation zone 2.
In some embodiments, in order to further reduce the occupied area of the oxidation and dissolved air flotation device, the flocculation area 2 is further provided with at least two groups of flocculation grids 22, each group of flocculation grids 22 is arranged along the water flow direction, and the inclination directions of the grids on two adjacent groups of flocculation grids 22 are opposite.
As shown, the flocculation zone 2 comprises 4 groups of flocculation grids 22, the water flow direction is the direction shown by arrow a, the four groups of flocculation grids 22 are arranged along the direction shown by arrow a, and the inclined directions along the direction of arrow a are respectively the inclined directions shown in the figure, so the entering and outputting aspects of the flocculation grids 22 are sequentially the upper left entering and the lower right exiting, the lower left entering and the upper right exiting and the upper left entering and the lower right exiting in the figure, thereby the water flow flows through the flocculation zone 2 in a serpentine shape.
In this way, the provision of the flocculation grid 22 extends the path of the flow of water, and therefore the residence time of the sewage to be treated in the flocculation zone 2. Further, compared with a flocculation mode of mechanical stirring, the hydraulic flocculation mode realized by the flocculation grid plate 22 reduces the power consumption, enhances the flocculation reaction effect, reduces the dosage of the flocculating agent to be added and reduces the medicament consumption.
It is easy to understand that the number of groups of the flocculation grid plate is related to the floor area of the flocculation area 2, the water flow speed and other factors, and when in specific use, only one group or one group of the flocculation grid plate can be arranged, and the flocculation grid plate can not be arranged as long as the preset retention time of the sewage to be treated in the flocculation area 2 can be met.
In one embodiment, in order to achieve a better separation effect between the suspended particles and the water flow, the oxidation and dissolved air flotation device may further include a flotation separation area 32, which is communicated with the flotation contact area 31 and is adapted to receive the floating wastewater containing the particles, and the bottom of the flotation separation area is provided with an outlet water collection hole plate 321, and the hole distance of the outlet holes 322 of the outlet water collection hole plate 321 is gradually increased along the water flow direction.
The water outlet hole 322 through the water outlet collecting hole plate 321 is along the water flow in the oxidation and dissolved air floatation device, the hole distance of the flow direction is gradually increased, namely gradually increased along the arrow A direction, the water outlet speed of the water outlet collecting hole plate 321 is gradually reduced along the arrow A direction, the area with small water outlet pressure in the air floatation separation area 32 corresponds to the area with small hole distance of the water outlet hole 322 in the water outlet collecting hole plate 321, and the area with large water outlet pressure corresponds to the area with large hole distance. Meanwhile, the water flow can also flow into the flocculation zone 2 along the direction of arrow A and then flow back to the region with low water outlet speed in the air flotation separation zone 32 along the direction indicated by arrow A, namely, the region with small hole distance on the water outlet collecting hole plate 321. Of course, the effluent pressure refers to the pressure that urges the water through the outlet aperture 322 through the effluent collection orifice 321.
Like this, can improve the play water homogeneity on the whole air supporting separation zone 32 area, guarantee the even and higher hydraulic load that reaches of whole air supporting separation zone 32 velocity of water, avoid appearing short-term flow and go out the inhomogeneous etc. of water and lead to the condition that suspended particles and water flow separation effect are not good to improve the separation effect of suspended particles and rivers. Meanwhile, the path of the water flow and the stay time of the water flow are prolonged on the premise of the same floor area, the water yield per unit surface area of the air flotation separation area 32 is improved, and the separation effect of suspended particles and the water flow can be improved on the premise of not enlarging the floor area of the air flotation separation area 32.
In one embodiment, to further improve the separation effect of the suspended particles from the water, the aperture of the water outlet hole 322 is gradually reduced along the water flow direction, i.e. along the direction indicated by the arrow a.
Thus, the water outlet speed of the water outlet collecting hole plate 321 can be further gradually reduced along the direction indicated by the arrow A, the water outlet uniformity is further improved, the water outlet amount per unit surface area is further improved, and the separation effect of the suspended particles and the water flow is further improved.
It will be readily appreciated that in some embodiments, the apertures of the outlet holes 322 may be individually tapered in the direction of the water flow, without the outlet holes 322 of the outlet water collecting aperture plate 321 being tapered at an increasing pitch in the direction of arrow a. Therefore, the uniformity of the discharged water can be improved, the water yield per unit surface area can be improved, and the separation effect of the suspended particles and the water flow can be improved.
In one embodiment, in order to make the water flow enter the air flotation separation zone 32 in a more stable flow state, the oxidation and dissolved air flotation device provided in this embodiment may further include: and the water inlet retaining wall 311 is arranged between the air floatation contact area 31 and the air floatation separation area 32, and the upper part of the water inlet retaining wall 311 inclines towards the air floatation separation area 32.
The setting is cut apart the barricade 311 that intakes of air supporting contact zone 31 and air supporting disengagement zone 32, when making the sewage dissolve gas air supporting at air supporting contact zone 31 after the oxidation, can not collect orifice plate 321 outflow from going out water, thereby guarantee that sewage is through abundant dissolved air supporting before flowing from oxidation and dissolved air supporting device after the oxidation, suspended particles thing in the rivers floats to the surface of rivers, thereby prevented that partial rivers from flowing out oxidation and dissolved air supporting device before abundant dissolved air supporting, cause the decline of water treatment effect.
Certainly, in order to achieve sufficient dissolved air flotation, the rising speed of the water flow in the air flotation contact zone 31 should not be too high, specifically, it may be 10mm/s to 20mm/s, and the retention time of the water flow in the air flotation contact zone 31 should not be too short, for example: and may be not less than 60 seconds.
The setting of retaining wall 311 of intaking, particulate matter suspension sewage that can control in the air supporting contact zone 31 on the one hand does not flow into air supporting disengagement zone 32 before rising to a take the altitude, and furtherly, the upper portion of retaining wall 311 of intaking to air supporting disengagement zone 32 inclines, can prevent that particulate matter from floating the phenomenon that has influence solid-liquid separation effect such as short journey when retaining wall 311 gets into air supporting disengagement zone 32 from intaking to at the in-process of dissolving gas release device 312 release bubble, cross the water section grow gradually, the flow state of rivers is more stable, is favorable to the joint of microbubble with the particulate matter that suspends, reduces the emergence of short journey.
In some embodiments, the inclination angle of the water-feeding wall 311 to the air-floatation separation zone 32 can be represented by the angle between the water-feeding wall 311 and the horizontal plane, i.e. the angle "a" shown in the figure.
In some embodiments, to provide a stable pressure for the dissolved air, the oxidation and dissolved air flotation device may further include a gas pressurization device 5, which is in communication with the dissolved air releasing device 312 to increase the pressure of the dissolved air released by the dissolved air releasing device 312.
The gas supercharging device 5 is connected with the dissolved gas tank 6, dissolved gas is formed in the dissolved gas tank 6, the dissolved gas tank 6 is connected with the dissolved gas release device 312, and the gas pressure of the dissolved gas tank 6 can be improved to be suitable for normal dissolved gas through the gas supercharging device 5.
In some embodiments, the effluent obtained after the oxidation and dissolved air flotation device treatment may flow back to the dissolved air tank 6 according to a certain backflow ratio to compensate for the water flow loss generated when the dissolved air releasing device 312 releases the dissolved air.
Specifically, the reflux ratio can be 5% -15% of the water treatment amount designed for the single-seat air floatation separation area 32, and when the COD of the sewage to be treated is high, the reflux ratio can be properly increased to 10% -15%. In order to realize the backflow of the effluent to the dissolved air tank 6, the backflow pressure of the effluent can be 5-6.5 bar, and specifically, the backflow can be realized by the backflow dissolved air booster pump 130. Of course, a reflux dissolved gas flowmeter 131 for monitoring the reflux pressure may be further provided, and the reflux dissolved gas booster pump may be controlled according to the monitored reflux pressure, so as to maintain the reflux pressure at a suitable level.
Thus, the discharged water processed by the oxidation and dissolved air floatation device can be used for supplementing the water lost by the dissolved air tank 6 released by the connected dissolved air release device 312, and the water and the oxidizing gas pressurized by the gas pressurization device 5 are merged into new dissolved air in the dissolved air tank.
It can be seen that the gas pressure can be prevented from being lower through the gas supercharging device 5, and the gas-liquid mixture conveyed is unstable in the pipeline, so that the gas dissolving efficiency is improved, the hydraulic loss is reduced, and the energy consumption is reduced.
In a specific embodiment, the oxidation and dissolved air floatation device may further include a mechanical slag scraper 8 and a water outlet level adjusting device 7, wherein the mechanical slag scraper 8 is disposed above the air floatation separation zone 32 and is adapted to separate the suspended particles; and the effluent liquid level adjusting device 7 is arranged between the air floatation separation area 32 and the effluent area 4 communicated with the air floatation separation area 32 and is suitable for adjusting the height of the effluent liquid level.
In some embodiments, when the requirement on the concentration of the scum discharged is not high, specifically, 0.1% to 0.5%, the effluent level adjusting device 7 may be used, and when the requirement on the concentration of the scum discharged is high, specifically, 2% to 4%, the mechanical scum scraper 8 may be used.
It is easy to understand that as the scum increases, the scum discharge is required to be performed once per a predetermined period, specifically, the scum discharge period of the air floatation separation area 32 may be 4 to 6 hours, the thickness of the scum before scum discharge may be 50 to 100 mm, and the scum discharge time may be 3 to 5 minutes per time.
Therefore, by arranging the mechanical slag scraper 8 and the effluent liquid level adjusting device 7 at the same time, the flexible switching of two slag discharging modes of mechanical slag discharging and hydraulic slag discharging can be realized, the slag discharging concentration can be flexibly adjusted, and the requirements of different working conditions of scum dehydration treatment are met.
In one embodiment, in order to prevent the emission of oxidizing gases into the air, which could cause air pollution, the oxidation and dissolved air flotation device may further comprise a gas collection hood 9 adapted to collect said oxidizing gases that have not reacted.
The oxidizing gas may not be discharged into the air due to its harmfulness, and therefore it is necessary to prevent the oxidizing gas from being directly discharged into the air, and specifically, as shown in the figure, the discharged oxidizing gas may be collected first, and then the collected oxidizing gas may be collected into the tail gas elimination device 10 through the tail gas collection pipe, and then the collected oxidizing gas may be converted into a harmless gas in the tail gas elimination device 10 and then discharged into the air. In some embodiments, a gas collection hood 9 may be provided, it being understood that the gas collection hood 9 should at least cover the discharge of the oxidizing gas to the atmosphere.
Thus, the atmospheric environment can be prevented from being polluted by the oxidizing gas.
In a specific embodiment, the tank body of the oxidation and dissolved air flotation device is of an open structure without a discharge port, and the gas collecting hood 9 covers above a sewage flow treatment area of the oxidation and dissolved air flotation device, wherein the sewage flow treatment area includes the flocculation area 2, the air flotation contact area 31, the air flotation separation area 32 and the water outlet area 4.
Thus, the pool body of the oxidation and dissolved air floatation device can adopt an open structure through the covering of the gas collecting hood 9, thereby being suitable for large-scale water treatment scenes.
In some embodiments, the oxidizing gas may specifically be ozone. Thus, because ozone is a common oxidizing gas, the related process related to ozone is relatively mature, and the use of ozone as the oxidizing gas of the oxidation and dissolved air flotation device can facilitate the implementation of the oxidation and dissolved air flotation device provided in the embodiments of the present application. Secondly, the ozone has strong oxidizability, and can reduce COD of the sewage to be treated by oxidation at normal temperature and normal pressure. Finally, the ozone has strong oxidizing property and sterilizing property, and can sterilize and disinfect the sewage to be treated at the same time.
Experimental data are now available to demonstrate the water treatment effect of an oxidation and dissolved air flotation device when the oxidizing gas is ozone:
the quality of the sewage to be treated is as follows 1:
the treatment conditions were as follows: apparatus processing Scale 10m 3 The sewage to be treated enters a coagulation zone 1 from a water inlet, the polyaluminium chloride is added into the coagulation zone 1, the adding amount is 30mg/l, the coagulation reaction time is 3 minutes, and the velocity gradient is 400S –1 . Then enters a flocculation area 2, the retention time of a flocculation pool is 30 minutes, and the adding amount of ozone is aboutThe concentration was 10 mg/l. The effluent of the flocculation tank enters an air flotation zone, the ascending flow velocity of the air flotation zone is 25 m/h, the backflow ratio of pressurized water is 10 percent, and the pressure is 5-5.5 bar.
The oxidation and dissolved air flotation device operates continuously and stably, and the effluent quality is as follows 2:
| water temperature/. degree C | COD/(mg/L) | SS/(mg/L) | TP/(mg/L) |
| 19 | 25 | 5 | 0.2 |
The main water quality index of contrast business turn over water is visible, and the oxidation and dissolved air flotation device that this application provided can effectively get rid of organic matter COD, and the clearance is about 45%. For the old water plant upgrading and reconstruction project, the advanced treatment unit can be used for removing COD, and 30mg/L (25 mg/L in table 2) meeting the latest IV-class emission standard requirement is realized. Meanwhile, the system still realizes the removal of suspended solids SS and total phosphorus TP, the removal rate reaches 67 percent and 85 percent respectively, and the conventional process function of the air floatation tank is maintained and enhanced.
In some embodiments, the container floatation apparatus provided by the embodiments of the present application may further include a total flow meter 121 for monitoring the flow rate of the oxidizing gas generated by the oxidizing gas generation device 120, an oxidation flow meter 126 for monitoring the flow rate of the oxidizing gas supplied to the gas release device 21, and a dissolved gas flow meter 124 for monitoring the flow rate of the oxidizing gas supplied to the dissolved gas release device 312, so as to monitor the sufficiency of the oxidizing gas in each part of the oxidation and dissolved gas floatation apparatus. The flow of the oxidizing gas entering the gas releasing device 21 and the flow of the oxidizing gas entering the dissolved gas releasing device 312 can be respectively adjusted by the oxidizing gas adjusting valve 125 and the dissolved gas adjusting valve 123, so as to ensure that the oxidation and the dissolved gas floatation device are normal in oxidation and floatation. Furthermore, the device can also intelligently control the oxidation and dissolved air floatation device to treat the sewage, thereby reducing the cost of manpower control.
Although the embodiments of the present application are disclosed above, the present application is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present disclosure, and it is intended that the scope of the present disclosure be defined by the appended claims.
Claims (9)
1. An oxidation and dissolved air flotation device, characterized by comprising:
the flocculation area is suitable for receiving sewage to be treated, and the bottom of the flocculation area is provided with a gas release device which is suitable for releasing oxidizing gas to oxidize substances to be oxidized in the sewage to be treated so as to obtain oxidized sewage;
the air flotation contact area is communicated with the flocculation area, is suitable for receiving the oxidized sewage, and is provided with an air dissolving release device which is suitable for releasing air flotation gas combined with suspended particles in the oxidized sewage to float the suspended particles to obtain particle floating sewage;
the flocculation area is also provided with at least two groups of flocculation grid plates, each group of flocculation grid plates are arranged along the water flow direction, and the inclination directions of grid strips on two adjacent groups of flocculation grid plates are opposite.
2. The oxidation and dissolved air flotation device according to claim 1, further comprising:
and the air floatation separation area is communicated with the air floatation contact area and is suitable for receiving the floating sewage of the particles, the bottom of the air floatation separation area is provided with an outlet water collecting pore plate, and the hole distance of the water outlet hole of the outlet water collecting pore plate is gradually increased along the water flow direction.
3. The oxidation and dissolved air flotation device according to claim 2, wherein the aperture of said water outlet aperture decreases in the direction of said water flow.
4. The oxidation and dissolved air flotation device as set forth in claim 2, further comprising:
and the water inlet retaining wall is arranged between the air floatation contact area and the air floatation separation area, and the upper part of the water inlet retaining wall inclines to the air floatation separation area.
5. The oxidation and dissolved air flotation device according to claim 2, further comprising:
the mechanical slag scraper is arranged above the air floatation separation area and is suitable for separating the suspended particles;
and the water outlet liquid level adjusting device is arranged between the air floatation separation area and the water outlet area communicated with the air floatation separation area and is suitable for adjusting the height of the water outlet liquid level.
6. The oxidation and dissolved air flotation device according to claim 1, wherein said gas release means comprises aeration means.
7. The oxidation and dissolved air flotation device according to claim 1, further comprising:
and the gas pressurizing device is communicated with the dissolved gas releasing device and is suitable for increasing the pressure of the dissolved gas released by the dissolved gas releasing device.
8. The oxidation and dissolved air flotation device according to claim 5, further comprising:
and the gas collecting hood is suitable for collecting the unreacted oxidizing gas.
9. The oxidation and dissolved air flotation device of claim 8, wherein the gas collection hood covers a top of a wastewater flow treatment zone of the oxidation and dissolved air flotation device, the wastewater flow treatment zone comprising the flocculation zone, the flotation contact zone, the flotation separation zone, and the effluent zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220975372.6U CN217437927U (en) | 2022-04-26 | 2022-04-26 | Oxidation and dissolved air flotation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220975372.6U CN217437927U (en) | 2022-04-26 | 2022-04-26 | Oxidation and dissolved air flotation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217437927U true CN217437927U (en) | 2022-09-16 |
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|---|---|---|---|
| CN202220975372.6U Active CN217437927U (en) | 2022-04-26 | 2022-04-26 | Oxidation and dissolved air flotation device |
Country Status (1)
| Country | Link |
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| CN (1) | CN217437927U (en) |
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2022
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