Nanometer air flotation device

Abstract

The invention discloses a nanometer air flotation device, and relates to the field of sewage and wastewater treatment, the nanometer air flotation device comprises an air flotation box body, a mixing reaction chamber, a flow guide part, a jet flow mixer and a nanometer bubble generator, the air flotation box body extends along the up-down direction, and is sequentially divided into a scum area, a clear water area and a sludge settling area along the up-down direction; the mixing reaction chamber is arranged in the air floatation box body and extends in the vertical direction, the upper and lower ends of the mixing reaction chamber are respectively communicated with the air floatation box body, and the upper end of the mixing reaction chamber is positioned in the scum area; the flow guide piece is arranged in the mixing reaction chamber, extends in the vertical direction and is spiral; the jet mixer is used for reacting sewage, wastewater and a flocculating agent to form inlet water and is connected with the lower end of the mixing reaction chamber, and the inlet water is introduced into the mixing reaction chamber and flows upwards along the flow guide piece; the nanobubble generator is connected with the lower end of the mixing reaction chamber so as to introduce nanobubbles into the mixing reaction chamber to adsorb particles in water; thus, sewage and wastewater are efficiently treated, the structure is simple and compact, the occupied area is small, and the manufacturing cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of sewage and wastewater treatment, and in particular to a nanometer air flotation device. Background Art

[0002] Existing flotation devices can be divided into horizontal flow flotation devices, vertical flow flotation devices, oblique flow flotation devices, super-efficient shallow flotation devices and vortex flotation devices, etc. Generally, air compressors, circulating booster pumps and pressure dissolved air tanks are used to generate flotation bubbles with a diameter of 1-100μm to adsorb particles in sewage and wastewater for treatment. The treatment efficiency is low, the structure is complex, the manufacturing cost is high, and the area occupied is large. Summary of the invention

[0003] The main purpose of the present invention is to provide a nano-flotation device which utilizes nano-scale bubbles for adsorption to improve the wastewater treatment efficiency and has a small overall footprint and a simple structure.

[0004] In order to achieve the above-mentioned object, the present invention proposes a nano-air flotation device, which comprises:

[0005] The air flotation box is extended in the up-down direction and is divided into a scum area, a clear water area and a mud area in sequence in the up-down direction;

[0006] A mixing reaction chamber is arranged in the air flotation box and extends along the up-down direction, the upper and lower ends of the mixing reaction chamber are respectively connected to the air flotation box, and the upper end of the mixing reaction chamber is located in the scum area;

[0007] A flow guide member is disposed in the mixing reaction chamber, extending along the up-down direction and arranged in a spiral shape;

[0008] a jet mixer, used for reacting sewage and flocculant to form influent water, and connected to the lower end of the mixing reaction chamber, for passing the influent water into the mixing reaction chamber and flowing upward along the guide member; and

[0009] The nano bubble generator is connected to the lower end of the mixing reaction chamber so as to pass the nano bubbles generated by the nano bubble generator into the mixing reaction chamber to adsorb particles in the influent water.

[0010] Optionally, both upper and lower ends of the mixing reaction chamber are open, and the diameter of the upper port of the mixing reaction chamber gradually decreases along the up-down direction.

[0011] Optionally, the jet mixer is connected to the mixing reaction chamber via a water inlet pipe, and a water outlet of the water inlet pipe is arranged corresponding to the bottom end of the guide member and is extended along the tangential direction of the guide member.

[0012] Optionally, the nano-air flotation device further comprises:

[0013] water collection tanks; and,

[0014] At least one water outlet pipe, the water outlet pipe is extended in the horizontal direction, at least part of the water outlet pipe is inserted into the clean water area, and a plurality of water outlet holes are provided at intervals, and the water outlet pipe is connected to the water collecting tank;

[0015] Wherein, the horizontal direction and the up-down direction are perpendicular to each other.

[0016] Optionally, a water outlet valve is provided between the water collecting tank and the water outlet pipe.

[0017] Optionally, the nano-air flotation device further comprises:

[0018] a slag collecting box, connected to the upper end of the air flotation box; and

[0019] The scraper is arranged on the air flotation box and is used for moving the slag in the slag area into the slag collecting box.

[0020] Optionally, the slag collecting box is sleeved on the outer periphery of the upper end of the air flotation box;

[0021] The scraper comprises a driving member and at least one scraper, wherein the scraper is arranged at the upper end of the air flotation box and extends in the horizontal direction, and the driving member and the scraper are connected to drive the scraper to rotate around an axis extending in the up-down direction to push the slag in the slag area into the slag collecting box;

[0022] Wherein, the horizontal direction and the up-down direction are perpendicular to each other.

[0023] Optionally, the lower end of the sludge settling area is tapered.

[0024] Optionally, the lower end of the mixing reaction chamber is located in the sludge settling area.

[0025] Optionally, the nano-gas flotation device further comprises a releaser, and the releaser is arranged at the bottom of the mixing reaction chamber;

[0026] The nano bubble generator is connected to the releaser.

[0027] In the technical solution of the present invention, the jet mixer passes the influent formed by the reaction of sewage and wastewater and flocculant into the mixing reaction chamber, and then passes the nanobubbles with a diameter of 500-1000nm generated by the nanobubble generator into the mixing reaction chamber to realize the gas-liquid-solid multiphase flow contact reaction, and the influent drives the nanobubbles to flow upward in a spiral shape under the guidance of the guide member, wherein the lighter particle impurities adhering to the nanobubbles in the influent can float to the scum area to form scum, and the heavier particle impurities sink along the inner wall of the mixing reaction chamber under the action of the centrifugal force of the water flow. To the sludge settling area, and the water flowing to the outside of the mixing reaction chamber and located in the clean water area is the treated clean water, which effectively removes suspended matter, grease, organic matter, nitrogen and phosphorus in the water, realizes efficient treatment of sewage and wastewater, and has a simple and compact structure and a small footprint. Compared with the traditional flotation device, it can save about 50% of the floor space, low manufacturing cost, easy maintenance and replacement, low failure rate, suitable for various types of sewage pretreatment or deep treatment, low energy consumption, chemical agents can be saved by 30-50%, SS removal rate is greater than 96%, power consumption is saved by 20%-40%, and it has COD and ammonia nitrogen removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 A schematic structural diagram of an embodiment of a nanometer air flotation device provided by the present invention;

[0030] Figure 2 for Figure 1 A top view of part of the structure of the nano-flotation device.

[0031] Description of Figure Numbers:

[0032]

[0033]

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] Existing flotation devices can be divided into horizontal flow flotation devices, vertical flow flotation devices, oblique flow flotation devices, super-efficient shallow flotation devices and vortex flotation devices, etc. Generally, air compressors, circulating booster pumps and pressure dissolved air tanks are used to generate bubbles with a diameter of 1-100μm to adsorb particles in sewage and wastewater for treatment. The treatment efficiency is low, the structure is complex, the manufacturing cost is high, and the area occupied is large.

[0039] In view of this, the present invention provides a nanometer air floating device 100, Figure 1 and Figure 2 This is an embodiment of a nanometer air floating device 100 provided by the present invention.

[0040] See also Figure 1The nano-air flotation device 100 comprises an air flotation box 1, a mixing reaction chamber 2, a flow guide 3, a jet mixer 4 and a nano-bubble generator 5. The air flotation box 1 is extended in the up-down direction and is divided into a scum area 11, a clean water area 12 and a mud area 13 in sequence along the up-down direction; the mixing reaction chamber 2 is arranged in the air flotation box 1 and is extended in the up-down direction. The upper and lower ends of the mixing reaction chamber 2 are respectively connected to the air flotation box 1, and the upper end of the mixing reaction chamber 2 is located at the floating box 1. The guide member 3 is arranged in the mixing reaction chamber 2, extending along the up-down direction, and is arranged in a spiral shape; the jet mixer 4 is used for the sewage and wastewater to react with the flocculant to form influent, and is connected to the lower end of the mixing reaction chamber 2, so as to pass the influent into the mixing reaction chamber 2 and flow upward along the guide member 3; the nano bubble generator 5 is connected to the lower end of the mixing reaction chamber 2, so as to pass the nano bubbles generated by it into the mixing reaction chamber 2 to adsorb the particles in the influent.

[0041] In the technical solution of the present invention, the jet mixer 4 passes the influent formed by the reaction of sewage and flocculant into the mixing reaction chamber 2, and then passes the nanobubbles with a diameter of 500-1000nm generated by the nanobubble generator 5 into the mixing reaction chamber 2 to realize the gas-liquid-solid multiphase flow contact reaction, and the influent drives the nanobubbles to flow upward in a spiral shape under the guidance of the guide member 3, wherein the lighter particle impurities adhering to the nanobubbles in the influent can float to the scum area 11 to form scum 200, and the heavier particle impurities sink to the sludge area 13 along the inner wall of the mixing reaction chamber 2 under the centrifugal force of the water flow, and the water flowing out of the mixing reaction chamber 2 and located in the clean water area 12 is the treated clean water, which effectively removes suspended matter, grease, organic matter, nitrogen and phosphorus in the water, and realizes efficient treatment of sewage and wastewater.

[0042] The nano-bubbles produced by the nano-bubble generator 5 have a larger surface area, stronger gas solubility, slower rising speed, longer residence time in water, and longer reaction time with pollutants in water, compared with micron bubbles, thereby significantly improving the treatment efficiency. Since the surface of the nano-bubbles forms an ionosphere and carries a negative charge, it can adsorb substances with opposite electrical properties in the wastewater, so that the colloid destabilizes. With the adsorption of the particles in the water by the surface charge of the bubbles, the suspended matter in the water can be relatively fixed and gradually separated. After the nano-bubbles adsorb the suspended particles in the water, the suspended particles with a density greater than that of water will cause the adsorbed particles to increase in specific gravity and gradually sink to the bottom, while the particles adsorbed by the nano-bubbles have a density less than that of water and will gradually float, so the flotation performance is very good. In addition, since the nano-bubbles will produce hydroxyl radicals during the rupture process, OH is a strong oxidant that can oxidize and decompose organic matter and other reducing pollutants in the water.

[0043] The nano-air flotation device 100 provided by the present invention has dual functions of air flotation and sedimentation, good separation effect, high efficiency, short residence time of about 6 minutes, and adopts a spiral guide member 3, so that the incoming water and the nano-bubbles are in cyclonic contact, the contact and collision are more sufficient, the mass transfer effect is good, the bubble residence time is long, the adhesion is strong, and it has a high treatment efficiency, and can remove more than 95% of impurities such as suspended matter, grease, and colloids.

[0044] The nano-air flotation device 100 provided by the present invention uses the jet mixer 4 to achieve a mixing reaction between sewage and flocculant, with a fast mixing speed, low cost and less dosage than a stirring mixing method.

[0045] The nano-flotation device 100 provided by the present invention has a simple and compact structure and occupies a small area. Compared with the traditional flotation device, it can save about 50% of the floor space, has low manufacturing cost, adopts an integrated design, is easy to maintain and replace, has a low failure rate, is suitable for various types of sewage pretreatment or deep treatment, has low energy consumption, can save 30% to 50% of chemical agents, has a SS removal rate of more than 96%, saves 20% to 40% of electricity consumption, and has COD and ammonia nitrogen removal effects.

[0046] The nanometer air flotation device 100 provided by the present invention is suitable for treating wastewater containing oil, wastewater containing suspended matter and fine particles, reducing organic matter, nitrogen and phosphorus pollutants in wastewater, and can also remove algae, reduce turbidity, and increase dissolved oxygen in water. It is mainly used for food processing, slaughtering, papermaking, and chemical wastewater treatment, and can also be used for treating slightly polluted water in rivers and lakes, landscape water, and black and smelly water.

[0047] It should be noted that in the present invention, the flocculant is polyaluminium chloride or aluminium ferric chloride (PAFC). Specifically, in one embodiment of the present invention, the SS in the wastewater is 400mg / L, the COD is 500mg / L, polyaluminium chloride is used as a flocculant, the dosage is 25mg / L, the circulation flow is 20%, the hydraulic retention time is 7min, the water quality of the clean water area 12 is tested, and the COD removal rate is 59%, and the suspended solid SS removal rate is 97%. In another embodiment of the present invention, the oil content in the wastewater is 200mg / L, aluminium ferric chloride (PAFC) is used as a flocculant, the dosage is 30mg / L, the circulation flow is 20%, the hydraulic retention time is 10min, the water quality of the clean water area 12 is tested, the oil content is reduced to 8mg / L, and the removal rate is 96%.

[0048] It should also be noted that the nano bubble generator 5 inhales air, oxygen, ozone or nitrogen etc. from its air inlet to form a gas-liquid mixture.

[0049] For further information, see Figure 1 , the upper and lower ends of the mixing reaction chamber 2 are both open, and the diameter of the upper port of the mixing reaction chamber 2 gradually decreases along the upper and lower directions. In this way, the diameter of the upper port of the mixing reaction chamber 2 gradually increases from bottom to top, and the rising flow rate of the influent water gradually decreases. When it flows out of the mixing reaction chamber 2, that is, flows to the scum area 11, the heavier particulate impurities in the influent water will sink along the inner wall of the flotation box 1 to the sludge area 13, which is conducive to further improving the sewage treatment effect.

[0050] For details, please refer to Figure 1 The jet mixer 4 is connected to the mixing reaction chamber 2 through the water inlet pipe 6, and the water outlet of the water inlet pipe 6 is arranged corresponding to the bottom end of the guide member 3 and is extended along the tangent direction of the guide member 3. In this way, the water flowing out through the water outlet of the water inlet pipe 6 will drive the nano bubbles to flow in a spiral upward manner under the action of the guide member 3, and the solid-liquid separation efficiency in the water inlet is improved by centrifugal force, so that the particulate impurities in the water inlet and the nano bubbles contact and collide more fully, thereby improving the sewage treatment effect.

[0051] For details, please refer to Figure 1 The nano-air flotation device 100 further includes a water collecting box and at least one water outlet pipe 8, the water outlet pipe 8 is extended in the horizontal direction, at least part of which is inserted in the clean water area 12, and is provided with a plurality of water outlet holes 81 distributed at intervals, the water outlet pipe 8 is connected to the water collecting box 7; wherein the horizontal direction and the up-down direction are perpendicular to each other. In this way, the clean water in the clean water area 12 flows to the water collecting box through the water outlet pipe 8, and the water outlet hole 81 is provided on the water outlet pipe 8, so that the water outlet is more uniform, avoiding disturbance to the siltation area 13.

[0052] More specifically, the number of the water outlet pipes 8 is not limited, and may be one, two, three or more. When there are multiple water outlet pipes 8 , the multiple water outlet pipes 8 may be distributed at intervals along the circumference of the air flotation box 1 .

[0053] In addition, the plurality of water outlet holes 81 on each of the water outlet pipes 8 are distributed at intervals along the circumference of the water outlet pipe 8 and / or the length direction of the water outlet pipe 8 .

[0054] Specifically, in the present invention, the distribution height of the scum area 11, the distribution height of the clean water area 12, and the distribution height of the sludge area 13 are adjustable according to actual conditions (including the volume of sewage and wastewater, etc.).

[0055] For further information, see Figure 1A water outlet valve 9 is provided between the water collecting box and the water outlet pipe 8; thus, by setting the water outlet valve 9, the water output of the clean water area 12 can be controlled, thereby controlling the distribution height of the scum area 11, thereby controlling the thickness of the scum 200, ensuring that the separated scum 200 carries less water, and reducing water inlet loss.

[0056] Furthermore, in one embodiment of the present invention, the water outlet valve 9 is a gate valve.

[0057] For details, please refer to Figure 1 The nano-air flotation device 100 also includes a slag box 10 and a scraper 1A. The slag box 10 is connected to the upper end of the air flotation box 1; the scraper 1A is arranged in the air flotation box 1, and is used to move the slag 200 in the slag area 11 into the slag box 10.

[0058] For further information, see Figure 1 and Figure 2 In one embodiment of the present invention, the slag collecting box 10 is sleeved on the outer periphery of the upper end of the air flotation box 1; the scraper 1A includes a driving member 1A1 and at least one scraper 1A2, the scraper 1A2 is arranged at the upper end of the air flotation box 1 and extends in the horizontal direction, the driving member 1A1 and the scraper 1A2 are drivingly connected to drive the scraper 1A2 to rotate around the axis extending in the up-down direction to push the slag 200 in the slag area 11 into the slag collecting box 10. In this way, by driving the scraper 1A2 to rotate, the slag 200 in the slag area 11 is driven to move into the slag collecting box 10; and the scraper 1A2 requires little power to rotate, has a low failure rate, and has low energy consumption.

[0059] It should be noted that, in the present invention, the configuration of the driving member 1A1 is not limited, and may be a driving motor, a driving cylinder, etc. Specifically, in one embodiment of the present invention, the driving member 1A1 is a driving motor. More specifically, the scraper 1A further includes a controller, which is electrically connected to the driving motor to control the output power of the driving motor, thereby controlling the rotation rate of the scraper 1A2.

[0060] Furthermore, in one embodiment of the present invention, the scraper 1A2 is a flexible plate.

[0061] For details, please refer to Figure 1 The lower end of the mud settling area 13 is tapered to improve the sedimentation efficiency and collection efficiency of heavier particulate impurities. More specifically, a mud outlet is formed through the bottom wall of the air flotation box 1, and the mud outlet is connected to a mud collecting box.

[0062] For details, please refer to Figure 1The lower end of the mixing reaction chamber 2 is located in the sludge settling area 13 , which is beneficial to improving the clean water quality of the clean water area 12 .

[0063] For details, please refer to Figure 1 The nano-air flotation device 100 further includes a releaser 1B, which is disposed at the bottom of the mixing reaction chamber 2; the nano-bubble generator 5 is connected to the releaser 1B.

[0064] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A nanometer air flotation device, characterized in that: The nanometer air flotation device comprises: The air flotation box is extended in the up-down direction and is divided into a scum area, a clear water area and a mud area in sequence in the up-down direction; A mixing reaction chamber is arranged in the air flotation box and extends along the up-down direction, the upper and lower ends of the mixing reaction chamber are respectively connected to the air flotation box, and the upper end of the mixing reaction chamber is located in the scum area; A flow guide member is disposed in the mixing reaction chamber, extending along the up-down direction and arranged in a spiral shape; a jet mixer, used for reacting sewage and flocculant to form influent water, and connected to the lower end of the mixing reaction chamber, for passing the influent water into the mixing reaction chamber and flowing upward along the guide member; and The nano bubble generator is connected to the lower end of the mixing reaction chamber so as to pass the nano bubbles generated by the nano bubble generator into the mixing reaction chamber to adsorb particles in the influent water.

2. The nano-air flotation device according to claim 1, characterized in that: The upper and lower ends of the mixing reaction chamber are both open, and the diameter of the upper port of the mixing reaction chamber gradually decreases along the upper and lower directions.

3. The nano-air flotation device according to claim 1, characterized in that: The jet mixer is connected to the mixing reaction chamber via a water inlet pipe, and the water outlet of the water inlet pipe is arranged corresponding to the bottom end of the guide member and is extended along the tangent direction of the guide member.

4. The nano-air flotation device according to claim 1, characterized in that: The nanometer air flotation device also includes: water collection tanks; and, At least one water outlet pipe, the water outlet pipe is extended in the horizontal direction, at least part of the water outlet pipe is inserted into the clean water area, and a plurality of water outlet holes are provided at intervals, and the water outlet pipe is connected to the water collecting tank; Wherein, the horizontal direction and the up-down direction are perpendicular to each other.

5. The nano-air flotation device according to claim 4, characterized in that: A water outlet valve is arranged between the water collecting box and the water outlet pipe.

6. The nano-air flotation device according to claim 1, characterized in that: The nanometer air flotation device also includes: a slag collecting box, connected to the upper end of the air flotation box; and The scraper is arranged on the air flotation box and is used for moving the slag in the slag area into the slag collecting box.

7. The nano-air floating device according to claim 6, characterized in that: The slag collecting box is sleeved on the outer periphery of the upper end of the air flotation box; The scraper comprises a driving member and at least one scraper, wherein the scraper is arranged at the upper end of the air flotation box and extends in the horizontal direction, and the driving member and the scraper are connected to drive the scraper to rotate around an axis extending in the up-down direction to push the slag in the slag area into the slag collecting box; Wherein, the horizontal direction and the up-down direction are perpendicular to each other.

8. The nano-air flotation device according to claim 1, characterized in that: The lower end of the mud settling area is tapered.

9. The nano-air flotation device according to claim 1, characterized in that: The lower end of the mixing reaction chamber is located in the sludge settling area.

10. The nano-air flotation device according to claim 1, characterized in that: The nano-gas flotation device further comprises a releaser, which is arranged at the bottom of the mixing reaction chamber; The nano bubble generator is connected to the releaser.

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