Efficient sewage treatment and purification system

Abstract

The invention relates to the technical field of sewage treatment, in particular to an efficient sewage treatment and purification system, and solves the problems that in the sewage treatment process, high sludge concentration inevitably causes membrane pollution and blockage, and membrane surface pollutant deposition causes flux reduction, frequent cleaning and too high operation cost. Comprising a tank body, a deslagging end plate and a plurality of sewage inlet pipes are inserted into one end of the tank body in a penetrating manner, a clear water outlet end plate is inserted into the other end of the tank body in a penetrating manner, a membrane filtration module is detachably mounted in the tank body, and the interior of the tank body is divided into a biological treatment air flotation bin and a clear water bin by the membrane filtration module; the inner side of the biological treatment air floatation bin is filled with a plurality of biofilm carrier modules. According to the invention, collaborative optimization of sewage treatment efficiency, energy consumption and membrane service life is realized through the technologies of increasing the microbial loading capacity by polyurethane sponge, enhancing mass transfer by micro-nano bubbles and preventing pollution by membrane surface air floatation.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, specifically to a sewage efficient treatment and purification system. BACKGROUND

[0002] With the acceleration of urbanization and the development of industrialization, the sewage discharge is increasing, which causes serious pollution to the environment, sewage treatment is an important part of protecting the environment and human health, sewage treatment is a technology system for purifying water bodies through physical, chemical and biological methods to meet the discharge or reuse standards, which is mainly divided into two categories of production sewage treatment and domestic sewage treatment; The treatment process includes three levels: the first level treatment removes suspended solids by grating and sedimentation; the second level treatment degrades organic matter by biological technology such as activated sludge method and biofilm method; the third level treatment is deep purification by membrane separation and ion exchange technology, and the activated sludge method and the biofilm method usually use microorganisms and membrane filtration, which has high retention capacity for biomass.

[0003] However, in the sewage treatment process, the high sludge concentration inevitably leads to membrane pollution and blockage problems, the deposition of pollutants on the membrane surface leads to flux decline, frequent cleaning, and high operating cost; therefore, it does not meet the existing demand, and for this purpose, we propose a sewage efficient treatment and purification system. SUMMARY

[0004] The purpose of the present application is to provide a sewage efficient treatment and purification system to solve the problem of membrane pollution and blockage caused by high sludge concentration in the sewage treatment process, which leads to flux decline due to deposition of pollutants on the membrane surface, frequent cleaning, and high operating cost.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a sewage efficient treatment and purification system, comprising a pool body, one end of the pool body is inserted through a slag discharge end plate and a plurality of sewage inlet pipes, the other end of the pool body is inserted through a clear water outlet end plate, the inside of the pool body is detachably installed with a membrane filtration module, the membrane filtration module divides the inside of the pool body into a biological treatment air flotation bin and a clear water bin, the inside of the biological treatment air flotation bin is filled with a plurality of biofilm carrier modules, the filling rate of the biofilm carrier modules in the biological treatment air flotation bin is forty percent to sixty percent, and the inside of the biological treatment air flotation bin is further fixed with an inclined slag discharge guide plate, the end position of the slag discharge guide plate close to the slag discharge end plate is lower than the height position of the slag discharge end plate.

[0006] Preferably, the specific surface area of the biofilm carrier module is 500-800 m² / g, the open porosity is 95%, the biofilm carrier module uses polyurethane sponge, the polyurethane sponge has a three-dimensional porous structure, the volume is 2cm*2cm, and the polyurethane sponge is internally provided with aerobic bacteria, facultative bacteria and anaerobic bacteria.

[0007] Preferably, the membrane filtration module uses a microfiltration ceramic membrane with a pore size of 1-5 microns, and the membrane filtration module is externally provided with a frame plate and is connected to the inner wall of the pool body through the frame plate.

[0008] Preferably, the aeration module further comprises a micro-nano bubble generator, the micro-nano bubble generator is connected with a micro-nano bubble generator water inlet pipe and a micro-nano bubble generator water-gas conveying and mixing pipe, one end of the micro-nano bubble generator water inlet pipe extends through the bottom of the pool body to the inside of the clear water bin, one end of the micro-nano bubble generator water-gas conveying and mixing pipe extends through the bottom of the pool body to the inside of the biological treatment air floatation bin, and the air inlet of the micro-nano bubble generator is exposed to the outside air.

[0009] Preferably, the end of the micro-nano bubble generator water inlet pipe inside the clear water bin is connected with a micro-nano bubble generator water inlet head, the end of the micro-nano bubble generator water-gas conveying and mixing pipe inside the biological treatment air floatation bin is connected with a micro-nano bubble generator water-gas mixed liquid outlet head, the micro-nano bubble generator absorbs outside air to generate micro-nano bubbles, and the micro-nano bubbles are sent into the biological treatment air floatation bin through the micro-nano bubble generator water-gas conveying and mixing pipe and the micro-nano bubble generator water-gas mixed liquid outlet head.

[0010] Preferably, the surface of the residue discharging guide plate is provided with air floatation holes with a diameter less than 2cm.

[0011] Preferably, a residue separation and recovery module is arranged between the sewage inlet pipe and the residue discharging end plate, the residue separation and recovery module comprises a collection frame, the bottom surface of the collection frame is fixed with four support rods, the bottom ends of the support rods are fixed to the ground, and both ends of the collection frame are inserted with a collection pipe.

[0012] Preferably, two magnetic strips are fixed to the inner side of the collection frame, a metal filter screen is magnetically attached to the upper surfaces of the two magnetic strips, and two handles are fixed to the upper surface of the metal filter screen.

[0013] Preferably, a drainage plate is arranged on the inner side of the collection frame, the middle part of the drainage plate protrudes upward, so that the upper surface of the drainage plate has an inverted V-shaped structure, and two flow converging blocks are arranged on the upper surfaces of both ends of the drainage plate.

[0014] Preferably, the upper surface of the flow-converging block is an inclined slope, and the slope is divided into two points a and b, and the position of point a is higher than that of point b.

[0015] Compared with the prior art, the present application has the following advantages: 1. The present application improves the microbial load by using the biofilm carrier module, realizes efficient interception of suspended sludge in sewage, and cooperates with the membrane filtration module to perform biological filtration treatment on the sewage, and generates micro-nano bubbles by using the micro-nano bubble generator, the micro-nano bubble generator water inlet head, the micro-nano bubble generator water inlet pipe, the micro-nano bubble generator water-gas conveying and mixing pipe, and the micro-nano bubble generator water-gas mixture outlet, and the micro-nano bubbles are used to clean the surface of the membrane filtration module, so that the plugging rate of the membrane holes of the membrane filtration module is reduced, the pollution rate of the membrane filtration module is reduced, and the treatment efficiency of the sewage is improved. 2. The micro-nano bubbles generated by the micro-nano bubble generator and the clean water extracted by the micro-nano bubble generator water inlet head and the micro-nano bubble generator water inlet pipe form a water-gas mixture inside the micro-nano bubble generator, the water-gas mixture is conveyed into the biological treatment air flotation bin through the micro-nano bubble generator water-gas conveying and mixing pipe and the micro-nano bubble generator water-gas mixture outlet, and after the water-gas mixture enters the inside of the biological treatment air flotation bin, it is discharged along the section of the membrane filtration module, forming a gas-liquid shear flow and a shear force on the surface of the membrane filtration module, which performs backwashing on the membrane filtration module, promotes the cleaning of the surface of the membrane filtration module, reduces the plugging of the membrane holes of the membrane filtration module, and uses the air flotation effect to inhibit the pollution rate of the membrane filtration module, so that the aeration process replaces the backwashing requirement, without the need to additionally set a backwashing unit, thereby prolonging the service life of the membrane filtration module and reducing the operation cost. 3. The present application ensures that the suspended particles in the sewage can pass through the polyurethane sponge biofilm carrier, and after the surface of the membrane filtration module is cleaned by the micro-nano bubbles and rises, the pollutants generated by the cleaning are taken to the top of the biological treatment air flotation bin by the air flotation effect of the micro-nano bubbles, and are discharged through the discharge end plate, thereby strengthening the filtration characteristics and anti-pollution performance of the membrane filtration module. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 The figure is a structural schematic diagram of the whole application; Fig. 2 The figure is a structural schematic diagram of the inside of the pool body of the application; Fig. 3 The figure is a structural schematic diagram of the residue separation and recovery module of the application; Fig. 4 The figure is a top view of the collection frame of the application.

[0017] In the diagram: 1. Tank body; 2. Biological treatment flotation chamber; 3. Clear water chamber; 4. Sludge discharge end plate; 5. Sludge discharge guide plate; 6. Wastewater inlet pipe; 7. Clear water outlet end plate; 8. Biofilm carrier module; 9. Micro-nano bubble generator; 10. Micro-nano bubble generator inlet head; 11. Micro-nano bubble generator inlet pipe; 12. Micro-nano bubble generator water-air mixing pipe; 13. Micro-nano bubble generator water-air mixture outlet; 14. Membrane filtration module; 15. Micro-nano bubbles; 16. Residue separation and recovery module; 1601. Collection frame; 1602. Collection pipe; 1603. Metal filter screen; 1604. Handle; 1605. Drainage plate; 1606. Converging block; 1607. Magnetic strip; 17. Support rod. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] like Figs. 1 to 4 As shown, a high-efficiency wastewater treatment and purification system includes a tank 1. One end of the tank 1 is connected to a sludge discharge end plate 4 and multiple wastewater inlet pipes 6, and the other end of the tank 1 is connected to a clean water outlet end plate 7. A membrane filtration module 14 is detachably installed inside the tank 1. The membrane filtration module 14 divides the interior of the tank 1 into a biological treatment flotation chamber 2 and a clean water chamber 3. The inside of the biological treatment flotation chamber 2 is filled with multiple membrane carrier modules 8, and the filling rate of the membrane carrier modules 8 inside the biological treatment flotation chamber 2 is 40% to 60%. An inclined sludge discharge guide plate 5 is also fixed inside the biological treatment flotation chamber 2. The end of the sludge discharge guide plate 5 near the sludge discharge end plate 4 is lower than the height of the sludge discharge end plate 4. Through the membrane carrier modules 8, some suspended sludge is intercepted inside the biological treatment flotation chamber 2, alleviating the membrane fouling problem during the membrane filtration process.

[0020] It also includes an aeration module, which includes a micro-nano bubble generator 9. The micro-nano bubble generator 9 is connected to a micro-nano bubble generator inlet pipe 11 and a micro-nano bubble generator water-air mixing pipe 12. One end of the micro-nano bubble generator inlet pipe 11 extends through the bottom of the tank body 1 to the inside of the clear water chamber 3. One end of the micro-nano bubble generator water-air mixing pipe 12 extends through the bottom of the tank body 1 to the inside of the biological treatment flotation chamber 2. The air inlet of the micro-nano bubble generator 9 is exposed to the outside air.

[0021] The end of the micro-nano bubble generator water inlet pipe 11 inside the clean water bin 3 is connected with a micro-nano bubble generator water inlet head 10, the end of the micro-nano bubble generator water and gas conveying and mixing pipe 12 inside the biological treatment air flotation bin 2 is connected with a micro-nano bubble generator water and gas mixed liquid outlet head 13, the micro-nano bubble generator 9 absorbs external air to generate micro-nano bubbles 15 and sends them into the biological treatment air flotation bin 2 through the micro-nano bubble generator water and gas conveying and mixing pipe 12 and the micro-nano bubble generator water and gas mixed liquid outlet head 13, the micro-nano bubbles 15 generated by the micro-nano bubble generator 9 form a water and gas mixed liquid with the clean water drawn by the micro-nano bubble generator water inlet head 10 and the micro-nano bubble generator water inlet pipe 11 inside the micro-nano bubble generator 9, and the water and gas mixed liquid flushes the surface of the membrane filtration module 14 after entering the biological treatment air flotation bin 2.

[0022] The specific surface area of the biofilm carrier module 8 is 500-800 m² / g, and the opening rate is >95%, which is beneficial to the attachment and growth of microorganisms. The biofilm carrier module 8 adopts polyurethane sponge, which has a three-dimensional porous structure with a volume of 2 cm x 2 cm. The polyurethane sponge is provided with aerobic bacteria, facultative bacteria and anaerobic bacteria. The aerobic bacteria, facultative bacteria and anaerobic bacteria inside the polyurethane sponge form a biofilm, and the biofilm has enhanced microbial activity and denitrification potential compared with activated sludge flocs.

[0023] The membrane filtration module 14 adopts a microfiltration grade ceramic membrane with a pore size of 1-5 microns. The outer side of the membrane filtration module 14 is provided with a frame plate and is connected with the inner wall of the pool body 1 through the frame plate. The retention capacity of the ceramic membrane effectively solves the problems of sludge flushing and slow biofilm formation, accelerates the formation speed of the biofilm, and effectively reduces the suspended solids concentration through the filtration effect of the ceramic membrane, ensuring that clean water flows out and avoiding the blockage of the micro-nano bubble generator.

[0024] The surface of the residue discharge guide plate 5 is provided with air flotation holes with a diameter less than 2 cm, which can ensure that the suspended particles in the sewage can pass through, while the polyurethane sponge biofilm carrier cannot pass through. After the surface of the membrane filtration module 14 is cleaned by the micro-nano bubbles 15 and rises, the pollutants generated by the cleaning are removed by the air flotation effect of the micro-nano bubbles 15.

[0025] The sewage inlet pipe 6 and the residue discharge end plate 4 are provided with a residue separation and recovery module 16, the residue separation and recovery module 16 comprises a collecting frame 1601, the bottom surface of the collecting frame 1601 is fixed with four supporting rods 17, the bottom end of the supporting rod 17 is fixed with the ground, both ends of the collecting frame 1601 are penetrated and inserted with a collecting pipe 1602, the collecting pipe 1602 is connected with a water pump, the water pump is connected with a water storage tank through a water pipe, the inner side of the collecting frame 1601 is fixed with two magnetic strips 1607, the upper surface of the two magnetic strips 1607 is magnetically adsorbed with a metal filter screen 1603, the upper surface of the metal filter screen 1603 is fixed with two handles 1604, the liquid mixture discharged by the residue discharge end plate 4 is filtered by the metal filter screen 1603, the residue is intercepted and the aqueous solution passes through, the aqueous solution is recovered, and subsequent secondary purification and reuse after purification are facilitated.

[0026] The inner side of the collecting frame 1601 is provided with a drainage plate 1605, the middle part of the drainage plate 1605 protrudes upward, so that the upper surface of the drainage plate 1605 is a inverted V-shaped structure, the upper surface of both ends of the drainage plate 1605 is provided with two flow converging blocks 1606, the upper surface of the flow converging block 1606 is an inclined surface, the inclined surface is divided into two points a and b, the position of point a is higher than that of point b, through the drainage plate 1605, the aqueous solution is gathered to both ends of the collecting frame 1601, and the flow converging block 1606 ensures that the aqueous solution flows to the inside of the collecting pipe 1602, so that the aqueous solution is concentrated and collected.

[0027] Firstly, sewage is injected into the biological treatment air flotation bin 2 through the sewage inlet pipe 6, after the sewage is injected into the biological treatment air flotation bin 2, the biofilm formed by the growth of microorganisms in the membrane carrier module 8 is intercepted to the suspended sludge in the biological treatment air flotation bin 2, at the same time, the membrane filtration module 14 filters the sewage in the biological treatment air flotation bin 2, the filtered clean water passes through the membrane filtration module 14 and enters the clean water bin 3, at the same time, the micro-nano bubble generator 9 is powered on, the micro-nano bubble generator 9 inhales air from the outside and generates micro-nano bubbles 15, and the micro-nano bubble generator 9 mixes the clean water in the clean water bin 3 with the generated micro-nano bubbles 15 through the micro-nano bubble generator water inlet head 10 and the micro-nano bubble generator water inlet pipe 11, forms water-gas mixture, and sends the water-gas mixture into the biological treatment air flotation bin 2 through the micro-nano bubble generator water-gas conveying pipe 12 and the micro-nano bubble generator water-gas mixture outlet 13, after the water-gas mixture enters the biological treatment air flotation bin 2, the water-gas mixture enters the biological treatment air flotation bin 2 along the section of the membrane filtration module 14, forms a gas-liquid shear flow, and forms a shear force on the surface of the membrane filtration module 14, which performs backwashing on the membrane filtration module 14, promotes the cleaning of the surface of the membrane filtration module 14, reduces the blockage of the membrane holes of the membrane filtration module 14, at the same time, the micro-nano bubbles 15 carry oxygen to generate hydroxyl radicals (·OH), which can strengthen the oxidation of refractory organic matter, after the micro-nano bubbles 15 float up, the pollutants are sent to the surface of the slag discharging guide plate 5, the pollutants are discharged from the slag discharging end plate 4 and enter the collection frame 1601, realizing efficient purification and energy-saving operation of sewage.

[0028] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments but can be implemented in other embodiments without departing from the scope of the application. The embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description above, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A high-efficiency wastewater treatment and purification system, comprising a tank (1), characterized in that: One end of the tank (1) is connected to a slag discharge end plate (4) and multiple sewage inlet pipes (6), and the other end of the tank (1) is connected to a clear water outlet end plate (7). A membrane filtration module (14) is detachably installed inside the tank (1). The membrane filtration module (14) divides the inside of the tank (1) into a biological treatment flotation chamber (2) and a clear water chamber (3). The inside of the biological treatment flotation chamber (2) is filled with multiple biofilm carrier modules (8). The biofilm carrier modules (8) have a filling rate of 40% to 60% inside the biological treatment flotation chamber (2). An inclined slag discharge guide plate (5) is also fixed inside the biological treatment flotation chamber (2). The end of the slag discharge guide plate (5) near the slag discharge end plate (4) is lower than the height of the slag discharge end plate (4).

2. The wastewater high-efficiency treatment and purification system according to claim 1, characterized in that: The specific surface area of ​​the biofilm carrier module (8) is 500-800 m² / g and the porosity is >95%. The biofilm carrier module (8) is made of polyurethane sponge, which has a three-dimensional porous structure with a volume of 2 cm × 2 cm. The polyurethane sponge contains aerobic bacteria, facultative anaerobic bacteria and anaerobic bacteria.

3. The wastewater high-efficiency treatment and purification system according to claim 1, characterized in that: The membrane filtration module (14) uses a microfiltration-grade ceramic membrane with a pore size of 1-5 micrometers. The membrane filtration module (14) has a frame plate on its outer side and is connected to the inner wall of the pool body (1) through the frame plate.

4. The wastewater high-efficiency treatment and purification system according to claim 1, characterized in that: It also includes an aeration module, which includes a micro-nano bubble generator (9). The micro-nano bubble generator (9) is connected to a micro-nano bubble generator inlet pipe (11) and a micro-nano bubble generator water-air transport mixing pipe (12). One end of the micro-nano bubble generator inlet pipe (11) extends through the bottom of the pool body (1) to the interior of the clear water chamber (3). One end of the micro-nano bubble generator water-air transport mixing pipe (12) extends through the bottom of the pool body (1) to the interior of the biological treatment air flotation chamber (2). The air inlet of the micro-nano bubble generator (9) is exposed to the outside air.

5. The wastewater high-efficiency treatment and purification system according to claim 4, characterized in that: The end of the micro-nano bubble generator inlet pipe (11) located inside the clear water tank (3) is connected to the micro-nano bubble generator inlet head (10). The end of the micro-nano bubble generator water-air transport mixing pipe (12) located inside the biological treatment air flotation tank (2) is connected to the micro-nano bubble generator water-air mixture outlet (13). The micro-nano bubble generator (9) absorbs outside air to generate micro-nano bubbles (15), which are then sent into the biological treatment air flotation tank (2) through the micro-nano bubble generator water-air transport mixing pipe (12) and the micro-nano bubble generator water-air mixture outlet (13).

6. The wastewater high-efficiency treatment and purification system according to claim 1, characterized in that: The surface of the slag discharge guide plate (5) is provided with air flotation holes, and the diameter of the air flotation holes is less than 2cm.

7. The wastewater high-efficiency treatment and purification system according to claim 1, characterized in that: A residue separation and recycling module (16) is provided between the sewage inlet pipe (6) and the slag discharge end plate (4). The residue separation and recycling module (16) includes a collection frame (1601). Four support rods (17) are fixed on the bottom surface of the collection frame (1601). The bottom end of the support rods (17) is fixed to the ground. Collection pipes (1602) are inserted through both ends of the collection frame (1601). A water pump is connected to the collection pipe (1602). The water pump is connected to the water storage tank through a lubrication pipe.

8. The wastewater high-efficiency treatment and purification system according to claim 7, characterized in that: Two magnetic strips (1607) are fixed inside the collection box (1601). A metal filter screen (1603) is magnetically adsorbed on the upper surface of the two magnetic strips (1607). Two handles (1604) are fixed on the upper surface of the metal filter screen (1603).

9. The wastewater high-efficiency treatment and purification system according to claim 8, characterized in that: The inner side of the collection box (1601) is provided with a diversion plate (1605). The middle part of the diversion plate (1605) protrudes upward, so that the upper surface of the diversion plate (1605) is an inverted V-shaped structure. Two flow-gathering blocks (1606) are provided on the upper surfaces of both ends of the diversion plate (1605).

10. A high-efficiency wastewater treatment and purification system according to claim 9, characterized in that: The upper surface of the flow-gathering block (1606) is an inclined slope, which is divided into two points, a and b, with point a being higher than point b.

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