CN111498937A - Multi-channel shallow air flotation process and equipment - Google Patents

Abstract

The invention discloses a multi-channel shallow-layer air flotation process and equipment, and relates to the field of sewage treatment. In order to achieve the above purpose, the technical scheme of the invention: add air into the sewage to be treated, and the air generates a large amount of air through the inclined micro-nano functional ceramic membrane Micro-nano bubbles, 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, organic removal, low operating cost, low investment and simple maintenance.

Description

Multi-channel shallow air flotation process and equipment

technical field

The invention relates to a multi-channel shallow air flotation process and equipment, and mainly relates to the field of sewage treatment.

Background technique

Air flotation is an important water treatment technology, which forms highly dispersed tiny air bubbles in the water through special equipment. These air bubbles adhere to the hydrophobic solid or liquid particles in the wastewater to form flocs with an apparent density less than water and float to the surface. On the water surface, the formed scum layer is scraped off, so as to achieve the purpose of solid-liquid or liquid-liquid separation.

Air flotation is currently used in water supply, industrial wastewater and urban sewage treatment.

The flocs with bubbles adhering to the solid-liquid surface are generally removed by a combination of natural floating and slag scraping. Because the air flotation tank is deep and the natural floating speed is slow, the efficiency of air flotation separation is limited. For example, the use of smaller bubbles It will cause problems such as prolonged residence time and reduced efficiency.

There are two commonly used methods for air flotation to generate microbubbles: aeration method and dissolved air method. The aeration method, also known as the dispersed air method, usually sets a microporous diffuser plate or a diffuser tube at the bottom of the air flotation tank, and the compressed air escapes from the surface of the plate or the tube surface in the form of tiny bubbles. Large, the air flotation effect is not good. Dissolved gas method usually refers to the gas dissolved in water, which can escape from the water when the pressure on the water surface decreases. Commonly used equipment includes pressurized pump, dissolved gas tank, air compressor, pressure reducing valve, etc., equipment maintenance and management are more complicated .

SUMMARY OF THE INVENTION

In view of the above shortcomings of the prior art, according to the principle of shallow sedimentation, the present invention proposes a multi-channel shallow air flotation device, which has the advantages of low energy consumption, high separation efficiency, organic removal, low operating cost, low investment and simple maintenance. Features.

In order to achieve the above object, the technical scheme of the present invention is: adding air into the sewage to be treated, the air generates a large number of micro-nano bubbles through the inclined micro-nano functional ceramic membrane, and the impurities are brought to the liquid surface during the floating process of these micro-nano bubbles.

The technical principle and beneficial effects of the present invention are as follows:

The air is micro-nano through the micro-nano functional ceramic membrane, and the diameter of the generated micro-bubble 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 amount of The concentration of hydroxyl radicals strengthens the oxidation effect of micro-bubble.

A multi-channel shallow air flotation device, including an air flotation tank, a bracket and a number of micro-nano functional ceramic membranes; the bracket is arranged in the air flotation tank, and a number of the 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 inclined upward; the bracket has a built-in airflow channel, the airflow channel is connected to an external air supply device, and the The side wall of the airflow channel is provided with a plurality of exhaust holes, and the inner hole of the micro-nano functional ceramic membrane (3) communicates with the inner end of the airflow channel.

Air is filled into the interior through the bracket, and the air bubbles float upward under the action of buoyancy. During the floating process of the bubbles, they contact the micro-nano functional ceramic membrane. The micro-nano functional ceramic membrane will form the injected air into micro-nano bubbles, which are micronized. The micro-bubble will have a larger contact area and mass transfer area, higher mass transfer efficiency, and the nano-functional film can generate a certain concentration of hydroxyl radicals to strengthen the oxidation effect of micro-bubble. The generated micro-nano air bubbles adhere to the particles in the water and separate from the water, separating the particles and impurities from the water more efficiently. It has the characteristics of low energy consumption, high separation efficiency, organic removal, low operating cost, low investment and simple maintenance.

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 respectively connected with the micro-nano ceramic membrane, the air cavity is provided with an intubation tube, and the intubation tube is inserted and connected to the vent hole. The air enters the air cavity through the cannula, and then flows into each inner hole of the micro-nano functional ceramic membrane through the air cavity, and then enters the liquid through the micro-pores of the micro-nano ceramic membrane. At this time, the air has been micro-nanoified.

Preferably, the bracket is a vertically arranged wall, the micro-nano functional ceramic membrane is fixed on both sides of the wall, and a bracket with a wall structure is adopted, and the overall strength is higher.

Preferably, a sealing section extends vertically upward at 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 upper layer of the micro-nano functional ceramic membrane, Through the structure of one chamber in the above stroke, the sewage can better contact the micro-nano bubbles inside.

Preferably, the air flotation tank above the support is provided with a slag scraping device, which is convenient for cleaning the scum floating on the liquid surface.

Preferably, the slag scraping device includes a screw rod, a guide rod and a scraper; the screw rod and the guide rod are arranged horizontally side by side, the two ends of the screw rod rotate and cooperate with the air flotation tank, and the two ends of the guide rod are connected with the air flotation tank. The undulating pool is fixedly arranged, the scraper is provided with a screw hole corresponding to the screw, the screw hole is threaded with the screw, the scraper is provided with a through hole corresponding to the guide rod, and the through hole is connected with the screw. The guide rod is slidingly matched, and the scraper can be driven to slide on the guide rod by rotating the screw, and the scum can be cleaned by driving the scraper back and forth.

Preferably, the two sides of the screw rod are respectively provided with a guide rod, and by setting the two sides respectively, the driving force of the screw rod on the scraper can be more balanced.

Preferably, the lower edge of the scraper is provided with a number of scraping teeth, so that when the scum is driven to move, the sewage flows away from the bottom, and the liquid and the scum can be better separated.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only for the present invention. For three of the drawings, for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic structural diagram of an embodiment of the present invention;

Fig. 2 is a partial enlarged view of A of Fig. 1;

Figure 3 is a schematic structural diagram of a micro-nano ceramic membrane;

4 is a schematic diagram of a scraper according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a slag scraping device according to an embodiment of the present invention.

Among them, the air flotation tank 1, the bracket 2, the micro-nano functional ceramic membrane 3, the sealing section 4, the screw 5, the scraper 6, the scraper 7, the screw hole 8, the through hole 9, the guide rod 10, the exhaust hole 11, the cannula 12. Air flow channel 13.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only preferred embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example

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

The micro-nano functional ceramic membrane 3 is an existing common material, that is, a micro-nano ceramic membrane. Due to its small pore size, the air passing through it can be processed into a very small volume of particles.

The air is micronanoified by the micronano functional ceramic membrane 3, and the diameter of the generated microbubbles can reach the micronano level. Under the same conditions, the contact area, mass transfer area and mass transfer efficiency can be greatly improved; at the same time, the nanofunctional membrane can produce A certain concentration of hydroxyl radicals can strengthen the oxidation effect of micro-bubble.

The multi-channel shallow air flotation equipment includes an air flotation tank 1, a bracket 2 and several micro-nano functional ceramic membranes 3.

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

The support 2 has a built-in airflow channel 13, and the airflow channel 13 is connected to an external air supply device. The side wall of the airflow channel 13 is provided with a plurality of exhaust holes 11. The inner ends of the airflow passages 13 communicate with each other.

Air is filled into the interior through the support 2, and the air forms micro-nano bubbles under the action of the micro-nano ceramic membrane. The micro-nano bubbles float upward under the action of buoyancy, and the bubbles are in contact with the micro-nano functional ceramic membrane 3 during the floating process. The micro-nano functional ceramic membrane 3 will micro-nanoize the air bubbles, and the micro-nanoized air bubbles will have a larger contact area and mass transfer area, higher mass transfer efficiency, and the nano-functional membrane can generate a certain concentration of hydroxyl radicals , strengthen the oxidation effect of micro-bubble. The generated micro-nano air bubbles adhere to the particles in the water and separate from the water, separating the particles and impurities from the water more efficiently.

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 respectively connected with the micro-nano ceramic membrane, and the air cavity is provided with an intubation tube 12, and the intubation tube 12 is inserted to the vent hole 11 . The air enters the air cavity through the cannula 12, and then flows into each inner hole of the micro-nano functional ceramic membrane 3 through the air cavity, and then enters the liquid through the micro-pores of the nano-ceramic membrane. At this time, the air has been micronized.

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

The other end of the micro-nano functional ceramic membrane 3 vertically extends upward 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 on the upper layer. , Through the structure of one chamber in the above stroke, the sewage can better contact with the micro-nano bubbles in the interior. The air flotation tank 1 above the support 2 is provided with a slag scraping device, which is convenient for cleaning the scum floating on the liquid surface.

The slag 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 side by side, the two ends of the screw 5 are rotated and matched with the air flotation tank 1, and the guide rod 10 Both ends are fixedly arranged with the air flotation tank, the scraper 6 is provided with a screw hole 8 corresponding to the screw 5, the screw hole 8 is threaded with the screw 5, and the scraper 6 corresponds to the guide rod 10 A through hole 9 is provided, and the through hole 9 is slidably matched with the guide rod 10. By rotating the screw 5, the scraper 6 can be driven to slide on the guide rod 10, and the scraper 6 can be driven back and forth, so that the scum can be removed. clean up. A guide rod 10 is respectively provided on both sides of the screw rod 5 , and the driving force of the screw rod 5 to the scraper 6 can be more balanced by setting the two sides respectively. The lower edge of the scraper 6 is provided with a number of scraping teeth 7, so that when the scum is driven to move, the sewage flows away from the bottom, and the liquid and the scum can be better separated.

The gas generated by the micro-nano functional ceramic membrane 3 repels the flocs, and is driven by the upward force of the bubbles along the lower part of the ceramic membrane, and is discharged to the middle slag discharge channel, and is discharged to the top under the upward lift of the gas in the middle channel. The device is finally discharged.

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

1. In the present invention, the air (or other gas) is micronanoized through the micronano functional ceramic membrane 3, and the diameter of the generated microbubbles can reach the micronano level. Under the same conditions, the contact area, mass transfer area and mass transfer efficiency can be improved. Greatly improved; a certain concentration of hydroxyl radicals can be generated in the process of micro-nano, which can strengthen the oxidation effect of micro-bubble.

2. The present invention includes a multi-channel structure in which several micro-nano functional ceramic membranes 3 are arranged, which provides the possibility for high-efficiency air flotation separation and strengthens the separation effect.

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

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (9)

1. multi-channel shallow air flotation process, it is characterized in that, in sewage to be treated, add air, this air generates a large amount of micro-nano bubbles by the inclined micro-nano functional ceramic membrane (3), these micro-nano bubbles float in the process to remove impurities. brought to the surface. 2. A multi-channel shallow air flotation device, characterized in that it comprises an air flotation tank (1), a support (2) and several micro-nano functional ceramic membranes (3); The support (2) is arranged in the air flotation tank (1), a plurality of the micro-nano functional ceramic membranes (3) are sequentially distributed on the support (2) from top to bottom, and the micro-nano functional ceramic membranes ( 3) one end is fixed on the support (2), and the other end of the micro-nano functional ceramic membrane (3) is inclined upward; The support (2) has a built-in air flow channel, the air flow channel is externally connected to an air supply device, the side wall of the air flow channel is provided with a number of exhaust holes, and the inner hole of the micro-nano functional ceramic membrane (3) is connected with the air supply device. The inner ends of the air flow channels are communicated with each other. 3. The multi-channel shallow air flotation device according to claim 2, 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, and the air cavity is connected to the micro-nano functional ceramic membrane (3). The nano-ceramic membranes are respectively connected, the air cavity is provided with an intubation tube (12), and the intubation tube (12) is inserted into the exhaust hole (11). 4 . The multi-channel shallow air flotation device according to claim 2 , wherein the support ( 2 ) is a vertically arranged wall, and the micro-nano functional ceramic membrane ( 3 ) is fixed on the wall. 5 . both sides of the body. 5 . The multi-channel shallow air flotation device according to claim 2 , wherein the other end of the micro-nano functional ceramic membrane ( 3 ) has a sealing section ( 4 ) extending vertically upwards. A slag discharge port is left between the upper end of the segment (4) and the upper layer of the micro-nano functional ceramic membrane (3). 6 . The multi-channel shallow air flotation device according to claim 2 , wherein a slag scraping device is provided in the air flotation tank ( 1 ) above the support ( 2 ). 7 . 7. The multi-channel shallow air flotation device according to claim 6, wherein the slag scraping device comprises a screw (5), a guide rod (10) and a scraper (6); the screw (5) and the guide rod (10) are horizontally arranged side by side, the two ends of the screw (5) are rotatably matched with the air flotation tank (1), the two ends of the guide rod (10) are fixedly arranged with the heave tank, the scraper The plate (6) is provided with a screw hole (8) corresponding to the screw (5), the screw hole (8) is threadedly matched with the screw (5), and the scraper (6) corresponds to the guide rod (10). ) is provided with a through hole (9), and the through hole (9) is slidably matched with the guide rod (10). 8 . The multi-channel shallow air flotation device according to claim 7 , wherein a guide rod ( 10 ) is respectively provided on both sides of the screw rod ( 5 ). 9 . 9 . The multi-channel shallow air flotation device according to claim 7 , characterized in that: the lower edge of the scraper ( 6 ) is provided with a plurality of scraping teeth ( 7 ). 10 .

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