Micro-nano bubble air floating device

Abstract

The utility model belongs to the field of industrial wastewater sewage pretreatment provides a kind of micro-nano bubble air floatation device, including dissolved gas mixing pump and micro-nano nozzle, gas-liquid mixing pump is matched with the setting mode of efficient micro-nano nozzle, and air intake control is assisted with gas flowmeter, reach the gas-liquid mixing of high efficiency to produce high flow rate gas-liquid and release micro-nano bubble by micro-nano nozzle, compared with the dissolved gas air floatation equipment in prior art more compact, while, can be realized with lower cost, and air floatation efficiency is as high as 99.5%, with better air floatation efficiency compared with prior art, sewage pretreatment effect is better, simultaneously, with wider scope of application.

Description

Technical Field

[0001] This utility model belongs to the field of industrial wastewater pretreatment, and particularly relates to a micro-nano bubble flotation device. Background Technology

[0002] Dissolved air flotation (DAF) systems are a crucial part of wastewater treatment. Through physicochemical processes, microbubbles act as carriers to adhere to suspended solids, grease, colloids, and other impurities in the water, forming a bubble-particle complex that floats to the surface for scraping and removal, thus achieving preliminary wastewater impurity treatment.

[0003] Existing dissolved air flotation (DAF) systems include dissolved air flotation (DAF) machines, vortex-type DAF machines, and shallow DAF machines. DAF machines and shallow DAF machines require a dissolved air pump, dissolved air tank, and dissolved air release device. They produce tiny bubbles, have a generally poor flotation effect, and a flotation efficiency of 90-95%. They also require a lot of equipment, are difficult to debug, and have large equipment size. Vortex-type DAF machines use an aerator and a diffuser impeller to produce micro-large bubbles. They rely on natural air intake, making it difficult to control the air volume. Their flotation effect is poor, with a flotation efficiency of 80%, and they are only suitable for water quality with low effluent requirements. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a micro-nano bubble flotation device, which aims to solve the problems mentioned in the background art.

[0005] This utility model embodiment is implemented as follows: a micro-nano bubble flotation device includes a flotation tank, with an inlet pipe and an outlet pipe respectively provided at both ends of the flotation tank. Wastewater flows through the flotation tank through the inlet pipe and the outlet pipe. The flotation device also includes a gas-liquid mixing mechanism provided on one side of the flotation tank and connected to the inside of the flotation tank. The gas-liquid mixing mechanism includes a dissolved gas mixing pump installed outside the flotation tank and micro / nano nozzles connected to the output end of the dissolved gas mixing pump. The micro / nano nozzles are spaced apart at the bottom of the flotation tank. The gas-liquid mixing mechanism also includes a high-efficiency gas dissolver, the two ends of which are connected to the inlet and outlet ends of the dissolved gas mixing pump, respectively. The inlet end of the dissolved gas mixing pump is also equipped with a connected gas flow meter, which is used to control the intake gas volume.

[0006] As a further aspect of this utility model: the high-efficiency gas-dissolving device is a small vortex gas-dissolving device, which is used for rapid gas-liquid mixing; The number of micro-nano nozzles is multiple, and they are arranged in an array perpendicular to the direction of sewage flow to guide the output of micro-nano bubbles after being mixed by a high-efficiency dissolved air device.

[0007] As a further embodiment of this utility model, it also includes a slag skimming mechanism and a slag discharge trough corresponding to the slag skimming mechanism; The skimming mechanism includes a driving component and a skimming component connected to the driving component via a transmission wheel set. The skimming component reciprocates under the action of the transmission wheel set to send air bubbles and impurities into the slag discharge trough.

[0008] As a further embodiment of this utility model: the flotation tank is also equipped with a water level control valve; The water level control valve is installed between the water outlet pipe and the slag discharge trough. The water level control valve is used to control the liquid level in the flotation tank by the valve opening and closing state. The water level control valve is associated with the slag skimming mechanism and the slag discharge trough.

[0009] As a further aspect of this invention, it also includes a stirring mechanism disposed between the water inlet pipe and the micro / nano nozzle, wherein the stirring mechanism causes impurities in the wastewater to be fully suspended by stirring.

[0010] This utility model provides a micro-nano bubble flotation device, which adopts a gas-liquid mixing pump combined with a high-efficiency micro-nano nozzle, and is supplemented by a gas flow meter to control the air intake. This achieves efficient gas-liquid mixing to generate high-velocity gas-liquid, which is then released as micro-nano bubbles through the micro-nano nozzle. Compared with the dissolved air flotation equipment in the prior art, this device is more compact and can be implemented at a lower cost. Moreover, it has a flotation efficiency of up to 99.5%, which is better than the prior art. It also has a better wastewater pretreatment effect and a wider range of applications. Attached Figure Description

[0011] Figure 1 A structural diagram of a micro / nano bubble flotation device provided in an embodiment of this utility model; Figure 2 A side view of a micro / nano bubble flotation device provided in an embodiment of this utility model; Figure 3 This is a partial magnified view of a micro / nano bubble flotation device provided in an embodiment of the present invention.

[0012] In the attached diagram: 1-Inlet pipe, 2-Stirring mechanism, 3-Scum skimming mechanism, 4-Micro-nano nozzle, 5-Scum discharge trough, 6-Water level control valve, 7-Outlet pipe, 9-High-efficiency dissolved air device, 10-Dissolved air mixing pump, 11-Gas flow meter. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0015] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0016] like Figures 1 to 3 As shown, a micro-nano bubble flotation device provided in one embodiment of the present invention includes a flotation tank. The flotation tank is provided with an inlet pipe 1 and an outlet pipe 7 at both ends. Wastewater flows through the flotation tank through the inlet pipe 1 and the outlet pipe 7. The flotation device also includes a gas-liquid mixing mechanism provided on one side of the flotation tank and connected to the inside of the flotation tank. The gas-liquid mixing mechanism includes a dissolved gas mixing pump 10 installed outside the flotation tank and a micro-nano nozzle 4 connected to the output end of the dissolved gas mixing pump 10. The micro-nano nozzle 4 is spaced out at the bottom of the flotation tank. The gas-liquid mixing mechanism also includes a high-efficiency gas dissolver 9, the two ends of which are respectively connected to the inlet and outlet ends of the dissolved gas mixing pump 10; The inlet end of the dissolved gas mixing pump 10 is also provided with a connected gas flow meter 11, which is used to control the intake gas volume.

[0017] In this embodiment of the invention, a gas-liquid mixing pump 10 is used in conjunction with a high-efficiency micro-nano nozzle 4, and a gas flow meter 11 is used to control the air intake. This achieves efficient gas-liquid mixing to generate high-velocity gas-liquid mixture, which is then released as micro-nano bubbles through the micro-nano nozzle 4. Compared with the dissolved air flotation equipment in the prior art, this method is more compact and can be implemented at a lower cost. Moreover, the flotation efficiency is as high as 99.5%, which is better than the prior art. This results in better wastewater pretreatment and a wider range of applications.

[0018] In one embodiment of this utility model, the matching release device is a high-efficiency micro-nano nozzle 4. An air inlet is added to the inlet end of the gas-liquid mixing pump 10. The air inlet is connected to a gas flow meter 11 by a hose. The gas flow meter 11 controls the air intake. The gas and liquid are rapidly mixed in the high-efficiency gas dissolver 9. After generating high-velocity gas and liquid, micro-nano bubbles are released through the micro-nano nozzle 4. Micro-nano bubbles are bubbles in water with a size of 10 to tens of micrometers. Bubbles with a size of less than hundreds of nanometers are called nano bubbles. The mixed state of bubbles between the two is called micro-nano bubbles. The generated micro-nano bubbles are produced by introducing fluid from the center of the oval body along the internal tangent direction. The gas and liquid mixed in a certain proportion flow into the nozzle, rotate at high speed inside the machine, and then spray out from the holes at both ends. The gas and water are mixed into a jet state with high mixing efficiency. At the same time, the formation of micron-sized bubbles has high dissolution efficiency. Because the bubbles have a small diameter, the residence time in the water is extended. The flotation effect reaches 99%, which can completely separate oily wastewater.

[0019] like Figures 1 to 3 As shown, in a preferred embodiment of the present invention, the high-efficiency gas-dissolving device 9 is a small vortex gas-dissolving device, which is used for rapid gas-liquid mixing. The number of micro-nano nozzles 4 is multiple, and they are arranged in an array perpendicular to the direction of sewage flow to guide the output of micro-nano bubbles after being mixed by the high-efficiency dissolved air device 9.

[0020] In one embodiment of this utility model, the specific selection of the high-efficiency gas dissolver 9 and the setting method of the micro-nano nozzle 4 are further defined. For the high-efficiency gas dissolver 9, the following can be selected: pressure gas dissolver, jet gas dissolver, and vortex aspiration gas dissolver system. The reason for using the vortex gas dissolver is that its structure is smaller than that of various systems, and it has a more stable gas dissolving effect and continuity. In the nanoscale gas dissolving requirement required in this embodiment, it can better achieve the purpose of gas-liquid mixing.

[0021] like Figure 1 and Figure 2 As shown, in another preferred embodiment of the present invention, it further includes a slag skimming mechanism 3 and a slag discharge trough 5 corresponding to the slag skimming mechanism 3; The skimming mechanism 3 includes a driving component and a skimming component connected to the driving component via a transmission wheel set. The skimming component reciprocates under the action of the transmission wheel set to send air bubbles and impurities into the slag discharge trough 5.

[0022] Furthermore, the flotation tank is also equipped with a water level control valve 6; The water level control valve 6 is installed at the position between the water outlet pipe 7 and the slag discharge trough 5. The water level control valve 6 is used to control the liquid level in the flotation tank by the valve opening and closing state. The water level control valve 6 is associated with the slag skimming mechanism 3 and the slag discharge trough 5.

[0023] Furthermore, it also includes a stirring mechanism 2 disposed between the water inlet pipe 1 and the micro / nano nozzle 4, wherein the stirring mechanism 2 suspends impurities in the wastewater by stirring.

[0024] In one embodiment of this utility model, the function of the skimming mechanism 3 is to skim off the bubble-particle combination formed after adhering to suspended matter, grease, colloids and other impurities in the water. When the bubble-particle combination is formed, it will gradually float to the surface under the action of buoyancy. Finally, the reciprocating motion of the skimming mechanism 3 will scrape it off on the liquid surface and send it into the slag discharge tank 5 to realize the preliminary treatment step of sewage.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A micro / nano bubble flotation device, comprising a flotation tank, wherein an inlet pipe (1) and an outlet pipe (7) are respectively provided at both ends of the flotation tank, and wastewater flows through the flotation tank via the inlet pipe (1) and the outlet pipe (7), characterized in that, The flotation device also includes a gas-liquid mixing mechanism that is provided on one side of the flotation tank and connected to the interior of the flotation tank; The gas-liquid mixing mechanism includes a dissolved gas mixing pump (10) installed outside the flotation tank and micro-nano nozzles (4) connected to the output end of the dissolved gas mixing pump (10). The micro-nano nozzles (4) are spaced apart at the bottom of the flotation tank. The gas-liquid mixing mechanism also includes a high-efficiency gas dissolver (9), the two ends of which are connected to the inlet and outlet ends of the dissolved gas mixing pump (10). The inlet end of the dissolved gas mixing pump (10) is also provided with a connected gas flow meter (11), which is used to control the intake gas volume.

2. The micro / nano bubble flotation device according to claim 1, characterized in that, The high-efficiency gas-dissolving device (9) is a small vortex gas-dissolving device, which is used for rapid gas-liquid mixing. The number of micro-nano nozzles (4) is multiple and arranged in an array perpendicular to the direction of sewage flow, used to guide the output of micro-nano bubbles after being mixed by the high-efficiency dissolved air device (9).

3. The micro / nano bubble flotation device according to claim 2, characterized in that, It also includes a slag skimming mechanism (3) and a slag discharge trough (5) provided corresponding to the slag skimming mechanism (3); The skimming mechanism (3) includes a driving component and a skimming component connected to the driving component via a transmission wheel set. The skimming component reciprocates under the action of the transmission wheel set to send air bubbles and impurities into the slag discharge trough (5).

4. The micro / nano bubble flotation device according to claim 3, characterized in that, The flotation tank is also equipped with a water level control valve (6). The water level control valve (6) is installed between the water outlet pipe (7) and the slag discharge trough (5). The water level control valve (6) is used to control the liquid level in the flotation tank by the valve opening and closing state. The water level control valve (6) is associated with the slag skimming mechanism (3) and the slag discharge trough (5).

5. The micro / nano bubble flotation device according to claim 4, characterized in that, It also includes a stirring mechanism (2) set between the water inlet pipe (1) and the micro-nano nozzle (4), which stirs the impurities in the sewage to be fully suspended.

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