Multi-channel shallow flotation technology and equipment

Abstract

The invention discloses a multi-channel shallow flotation process and equipment, which relates to the field of sewage treatment. To achieve the above purpose, the technical solution of the invention is as follows: air is added to the sewage to be treated, and the air generates a large number of micro-nano bubbles through the inclined micro-nano functional ceramic membrane, and these micro-nano bubbles bring impurities to the liquid surface during the floating process. It has the characteristics of low energy consumption, high separation efficiency, removal of organic matter, low operating cost, low investment, and simple maintenance.

Description

Technical Field

[0001] The invention relates to a multi-channel shallow-layer air flotation process and equipment, and mainly relates to the field of sewage treatment. Background Art

[0002] Flotation is an important water treatment technology. Special equipment is used to form highly dispersed tiny bubbles in water. These bubbles adhere to hydrophobic solid or liquid particles in the wastewater, forming flocs with an apparent density less than that of water and floating to the water surface. The scum layer formed is scraped off, thereby achieving the purpose of solid-liquid or liquid-liquid separation.

[0003] Flotation is currently used in water supply, industrial wastewater and urban sewage treatment. Its advantages lie in the fact that its solid-liquid separation equipment has the characteristics of low investment, small footprint, high degree of automation and convenient operation and management.

[0004] Flocs formed by bubbles adhering to the surface of solid and liquid are generally removed by a combination of natural floating and scraping. Since the flotation tank is deep, the natural floating speed is slow, which limits the efficiency of flotation separation. If smaller bubbles are used, the residence time will be prolonged and the efficiency will be reduced.

[0005] There are two commonly used methods for flotation to produce microbubbles: aeration and dissolved air. Aeration, also known as dispersed air, usually involves setting a microporous diffusion plate or diffusion tube at the bottom of the flotation tank. Compressed air escapes from the plate or tube surface in the form of tiny bubbles into the water. The bubbles produced by this method are usually large, and the flotation effect is poor. Dissolved air usually refers to gas dissolved in water, which can escape from the water when the air pressure on the water surface decreases. Commonly used equipment includes booster pumps, dissolved air tanks, air compressors, pressure reducing valves, etc., and the equipment maintenance and management is relatively complex. Summary of the invention

[0006] In view of the above deficiencies in the prior art, the present invention proposes a multi-channel shallow flotation device based on the principle of shallow sedimentation, which has the characteristics of low energy consumption, high separation efficiency, ability to remove organic matter, low operating cost, low investment and simple maintenance.

[0007] To achieve the above purpose, the technical solution of the present invention is: add air into the sewage to be treated, and the air generates a large number of micro-nano bubbles through the inclined micro-nano functional ceramic membrane, and these micro-nano bubbles bring impurities to the liquid surface during the floating process.

[0008] The technical principles and beneficial effects of the present invention are as follows:

[0009] By using micro-nano functional ceramic membranes to micronize the air, the diameter of the generated microbubbles can reach the micro-nano level. Under the same conditions, the contact area, mass transfer area and mass transfer efficiency can be greatly improved; at the same time, the nano-functional membrane can produce a certain concentration of hydroxyl radicals to enhance the oxidation effect of microbubbles.

[0010] A multi-channel shallow flotation device comprises a flotation tank, a bracket and a plurality of micro-nano functional ceramic membranes; the bracket is arranged in the flotation tank, and the plurality of micro-nano functional ceramic membranes are sequentially distributed on the bracket from top to bottom, one end of the micro-nano functional ceramic membrane is fixed on the bracket, and the other end of the micro-nano functional ceramic membrane is arranged upwardly tilted; the bracket is provided with an air flow channel, the air flow channel is externally connected to an air supply device, and the side wall of the air flow channel is provided with a plurality of exhaust holes, which are connected to the inner hole of the micro-nano functional ceramic membrane and the inner end of the air flow channel.

[0011] Air is filled into the interior through the bracket, and the air bubbles float upward under the action of buoyancy. During the floating process, the bubbles come into contact with the micro-nano functional ceramic membrane, which converts the injected air into micro-nano bubbles. The micro-nano bubbles will have a larger contact area and mass transfer area, higher mass transfer efficiency, and the nano-functional membrane can produce a certain concentration of hydroxyl free radicals to enhance the oxidation effect of micro-bubbles. The generated micro-nano air bubbles adhere to the particles in the water and separate from the water, separating the particulate impurities from the water more efficiently. It has the characteristics of low energy consumption, high separation efficiency, removal of organic matter, low operating cost, low investment, and simple maintenance.

[0012] Preferably, one end of the micro-nano functional ceramic membrane is blocked, and the other end is provided with an air cavity, the air cavity is communicated with the micro-nano functional ceramic membrane respectively, the air cavity is provided with a cannula, and the cannula is plugged into the exhaust hole. The air enters the air cavity through the cannula, and then enters each inner hole of the micro-nano functional ceramic membrane through the air cavity, and then enters the liquid through the micropores of the micro-nano functional ceramic membrane. At this time, the air has been micronized.

[0013] Preferably, the support is a vertically arranged wall, and the micro-nano functional ceramic membrane is fixed on both sides of the wall. The support with a wall structure has higher overall strength.

[0014] Preferably, a sealing section is vertically extended upward from the other end of the micro-nano functional ceramic membrane, and a slag discharge port is left between the upper end of the sealing section and the micro-nano functional ceramic membrane of the upper layer. By forming a chamber structure, the sewage can better contact with the micro-nano bubbles inside.

[0015] Preferably, a scraping device is provided in the flotation tank above the support to facilitate cleaning of the scum floating on the liquid surface.

[0016] Preferably, the scraping device includes a screw, a guide rod and a scraper; the screw and the guide rod are horizontally arranged in parallel, the two ends of the screw are rotatably matched with the flotation tank, the two ends of the guide rod are fixedly arranged with the flotation tank, the scraper is provided with a screw hole corresponding to the screw, the screw hole is matched with the screw thread, the scraper is provided with a through hole corresponding to the guide rod, the through hole is slidably matched with the guide rod, the scraper can be driven to slide on the guide rod by rotating the screw, and the scraper can be driven back and forth to clean the scum.

[0017] Preferably, a guide rod is provided on both sides of the screw respectively. By providing the guide rods on both sides respectively, the force of the screw driving the scraper can be more balanced.

[0018] Preferably, a plurality of scraping teeth are provided on the lower edge of the scraper, so that when the scum is driven to move, the sewage can flow away below, thereby better separating the liquid from the scum. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only three of the drawings of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A partial enlarged view of;

[0022] Figure 3 Schematic diagram of the structure of micro-nano ceramic membrane;

[0023] Figure 4 is a schematic diagram of a scraper according to an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of a scraping device according to an embodiment of the present invention.

[0025] Among them, there are an air flotation tank 1, a bracket 2, a micro-nano functional ceramic membrane 3, a sealing section 4, a screw 5, a scraper 6, scraper teeth 7, a screw hole 8, a through hole 9, a guide rod 10, an exhaust hole 11, a plug 12, and an air flow channel 13. DETAILED DESCRIPTION

[0026] The technical solutions in the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only preferred embodiments of the present invention, not all embodiments. Based on the embodiments in 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.

[0027] Example

[0028] like Figure 1 As shown, in the multi-channel shallow flotation process of the embodiment of the present invention, air bubbles are added into the sewage to be treated, and the air bubbles are generated by the inclined micro-nano functional ceramic membrane 3.

[0029] The micro-nano functional ceramic membrane 3 is a commonly used material, namely a micro-nano ceramic membrane. Due to its small pore size, the air passing through it can be processed into particles of very small volume.

[0030] The air is micronized by the micro-nano functional ceramic membrane 3, and the diameter of the generated microbubbles can reach the micro-nano level. Under the same conditions, the contact area, mass transfer area and mass transfer efficiency can be greatly improved; at the same time, the nano-functional membrane can produce a certain concentration of hydroxyl radicals to enhance the oxidation effect of microbubbles.

[0031] A multi-channel shallow flotation device comprises an air flotation tank 1, a support 2 and a plurality of micro-nano functional ceramic membranes 3.

[0032] The support 2 is arranged in the flotation tank 1, and a plurality of the micro-nano functional ceramic membranes 3 are sequentially distributed on the support 2 from top to bottom, one end of the micro-nano functional ceramic membrane 3 is fixed on the support 2, and the other end of the micro-nano functional ceramic membrane 3 is arranged upwardly inclined. The support 2 is a vertically arranged wall, and the micro-nano functional ceramic membrane 3 is fixed on both sides of the wall. The support 2 with a wall structure has a higher overall strength.

[0033] The support 2 has an air flow channel 13 built therein, the air flow channel 13 is externally connected to an air supply device, and a plurality of exhaust holes 11 are provided on the side wall of the air flow channel 13 , which are connected to the inner end of the air flow channel 13 through the inner hole of the micro-nano functional ceramic membrane 3 .

[0034] Air is filled into the interior through the bracket 2, and the air forms micro-nano bubbles under the action of the micro-nano functional ceramic membrane 3. The micro-nano bubbles float upward under the action of buoyancy, and contact the micro-nano functional ceramic membrane 3 during the floating process. The micro-nano functional ceramic membrane 3 micro-nanoizes the air bubbles, and the micro-nanoized bubbles will have a larger contact area and mass transfer area, higher mass transfer efficiency, and the nano-functional membrane can produce a certain concentration of hydroxyl free radicals to enhance the oxidation effect of micro-bubbles. The generated micro-nano air bubbles adhere to the particles in the water and separate from the water, separating the particulate impurities from the water more efficiently.

[0035] One end of the micro-nano functional ceramic membrane 3 is blocked, and the other end is provided with an air cavity, the air cavity is communicated with the micro-nano functional ceramic membrane 3 respectively, and the air cavity is provided with an insert 12, and the insert 12 is plugged into the exhaust hole 11. The air enters the air cavity through the insert 12, and then enters each inner hole of the micro-nano functional ceramic membrane 3 through the air cavity, and then enters the liquid through the micropores of the nano-functional ceramic membrane 3. At this time, the air has been micronized.

[0036] In this embodiment, a plurality of brackets 2 are provided, and a slag discharge channel is provided between the micro-nano functional ceramic membranes 3 of adjacent brackets 2 .

[0037] The other end of the micro-nano functional ceramic membrane 3 is vertically extended with a sealing section 4, and a slag discharge port is left between the upper end of the sealing section 4 and the micro-nano functional ceramic membrane 3 of the upper layer, so that a chamber structure is formed, and the sewage can better contact with the micro-nano bubbles inside. A scraping device is provided in the flotation tank 1 above the bracket 2 to facilitate the cleaning of the scum floating on the liquid surface.

[0038] The scraping device includes a screw 5, a guide rod 10 and a scraper 6; the screw 5 and the guide rod 10 are arranged horizontally and side by side, the two ends of the screw 5 are rotatably matched with the flotation tank 1, the two ends of the guide rod 10 are fixedly arranged with the flotation tank, the scraper 6 is provided with a screw hole 8 corresponding to the screw 5, the screw hole 8 is threadedly matched with the screw 5, the scraper 6 is provided with a through hole 9 corresponding to the guide rod 10, the through hole 9 is slidably matched with the guide rod 10, and the scraper 6 can be driven to slide on the guide rod 10 by rotating the screw 5, and the scraper 6 can be driven back and forth to clean the scum. A guide rod 10 is respectively provided on both sides of the screw 5, and by being respectively provided on both sides, the force of the screw 5 driving the scraper 6 can be made more balanced. A plurality of scraping teeth 7 are provided on the lower edge of the scraper 6, so that when the scum is driven to move, the sewage flows away below, and the liquid and the scum can be better separated.

[0039] The gas generated by the micro-nano functional ceramic membrane 3 repels the flocs, and is discharged into the middle slag discharge channel under the push of the bubbles rising along the lower part of the micro-nano functional ceramic membrane 3. It is then discharged to the top under the upward lifting action of the gas in the middle channel and finally discharged through the scraping equipment.

[0040] This technical solution has the characteristics of low flotation energy consumption, high separation efficiency, removal of organic matter, low operating cost, low investment and simple maintenance.

[0041] 1. The present invention micronizes air (or other gases) through a micro-nano functional ceramic membrane 3, and the diameter of the generated microbubbles can reach the micro-nano level. Under the same conditions, the contact area, mass transfer area and mass transfer efficiency can be greatly improved; a certain concentration of hydroxyl radicals can be generated during the micronization process, thereby enhancing the oxidation effect of the microbubbles.

[0042] 2. The present invention includes a multi-channel structure formed by arranging a number of micro-nano functional ceramic membranes 3, which provides the possibility for efficient flotation separation and enhances the separation effect.

[0043] 3. The slag discharge system of the present invention makes full use of the lifting effect of the floating characteristics of bubbles, so that the slag is continuously discharged under the power of gas, saving power.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Multi-channel shallow flotation process, characterized in that: The flotation process is as follows: air is added into the wastewater to be treated, and the air passes through the inclined micro-nano functional ceramic membrane (3) to generate a large number of micro-nano bubbles, which bring impurities to the liquid surface during the floating process; The process adopts a multi-channel shallow air flotation device, which comprises an air flotation tank (1), a support (2) and a plurality of micro-nano functional ceramic membranes (3); The support (2) is arranged in the flotation tank (1), and a plurality of the micro-nano functional ceramic membranes (3) are sequentially distributed on the support (2) from top to bottom, one end of the micro-nano functional ceramic membrane (3) is fixed on the support (2), and the other end of the micro-nano functional ceramic membrane (3) is arranged to be inclined upward; The support (2) has an internal air flow channel, the air flow channel is externally connected to an air supply device, and the side wall of the air flow channel is provided with a plurality of exhaust holes, which are connected to the inner hole of the micro-nano functional ceramic membrane (3) and the inner end of the air flow channel; A sealing section (4) is vertically extended upward from the other end of the micro-nano functional ceramic membrane (3), and a slag discharge port is provided between the upper end of the sealing section (4) and the micro-nano functional ceramic membrane (3) of the upper layer.

2. The multi-channel shallow flotation process according to claim 1, characterized in that: One end of the micro-nano functional ceramic membrane (3) is blocked, and the other end is provided with an air cavity, the air cavity is communicated with the micro-nano functional ceramic membrane (3) respectively, the air cavity is provided with an insertion tube (12), and the insertion tube (12) is plugged into the exhaust hole (11).

3. The multi-channel shallow flotation process according to claim 1, characterized in that: The support (2) is a vertically arranged wall, and the micro-nano functional ceramic membrane (3) is fixed on both sides of the wall.

4. The multi-channel shallow flotation process according to claim 1, characterized in that: A scraping device is provided in the air flotation tank (1) above the support (2).

5. The multi-channel shallow flotation process according to claim 4, characterized in that: The scraping device comprises a screw rod (5), a guide rod (10) and a scraper (6); the screw rod (5) and the guide rod (10) are arranged horizontally in parallel, the two ends of the screw rod (5) are rotatably matched with the flotation tank (1), the two ends of the guide rod (10) are fixedly arranged with the flotation tank, the scraper (6) is provided with a screw hole (8) corresponding to the screw rod (5), the screw hole (8) is threadedly matched with the screw rod (5), the scraper (6) is provided with a through hole (9) corresponding to the guide rod (10), and the through hole (9) is slidably matched with the guide rod (10).

6. The multi-channel shallow flotation process according to claim 5, characterized in that: A guide rod (10) is respectively provided on both sides of the screw rod (5).

7. The multi-channel shallow flotation process according to claim 5, characterized in that: A plurality of scraping teeth (7) are provided on the lower edge of the scraper (6).

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