A polyvinyl alcohol spherical microbial carrier production device

Abstract

The utility model discloses a polyvinyl alcohol spherical microbial carrier production device, which belongs to the field of microbial carrier production devices. The device includes a material tank and a reaction box, wherein a stirring device is arranged inside the material tank; a first pipeline is connected to the bottom of the material tank, the other end of the first pipeline is connected to one end of a centrifugal pump, the other end of the centrifugal pump is connected to a second pipeline, and the other end of the second pipeline is connected to an extrusion device; a reaction box is arranged directly below the extrusion device; a movable screen and a flow-pushing agitator are arranged inside the reaction box. The utility model significantly improves the efficiency of preparing PVA gel beads.

Description

Technical Field

[0001] The utility model relates to the field of microbial carrier production devices, in particular to a polyvinyl alcohol spherical microbial carrier production device. Background Art

[0002] Living cell immobilization technology refers to a biotechnology that uses physical or chemical means to confine living cells to a specific spatial area (inside or on the surface of a carrier material), so that they can be reused while maintaining their activity. Compared with traditional activated sludge treatment methods, living cell immobilization technology can significantly increase the concentration of microorganisms, shorten treatment time, and reduce treatment costs. The protective effect of the carrier makes it difficult for microorganisms to be lost, and their resistance to toxicity and tolerance are significantly increased. Solid-liquid separation is easy and can be reused repeatedly. It is an efficient, low-consumption, and easy-to-operate and manage sewage biological treatment technology that can effectively treat organic wastewater, ammonia-containing wastewater, heavy metal wastewater, and dye wastewater, etc., and has excellent development prospects.

[0003] The key to the technology is to select a suitable microbial carrier. The microbial carrier not only needs to have good biological affinity and a large specific surface area to meet the conditions for microbial growth, but also requires good mechanical properties to resist the impact of hydraulic shear, and also requires appropriate density to achieve a suspended state in water. Polymer materials have low density, high stability, and are easy to mold and process into various shapes, so they are widely used as microbial carrier materials.

[0004] Natural high molecular weight polysaccharides such as sodium alginate, gelatin, and agar have the advantages of wide sources, convenient solidification and forming, and low toxicity to microorganisms, but have low mechanical strength and are deformed by hydraulic scouring during long-term sewage treatment processes, thus losing their application value. Synthetic polymers such as polyacrylamide (PAM) and photoresin have the advantages of anti-biological decomposition and high mechanical strength, but the polymer molding conditions are relatively severe and often have high toxicity to microorganisms. Polyvinyl alcohol has the advantages of good chemical stability, high anti-biological decomposition ability, high mechanical strength, no biological toxicity and low price. It has great potential value in the field of microbial carriers and has quickly become a hot topic of research at home and abroad. However, polyvinyl alcohol needs to be cross-linked to eliminate water solubility before it can be used as a sewage treatment material. The existing boric acid cross-linking method has the characteristics of simple process and easy reaction. The prepared PVA gel beads have been widely used in microbial carrier materials. However, some of its devices require manual dripping of solution and control of cross-linking reaction, low production efficiency, and are not suitable for large-scale production or laboratory batch use. Therefore, it is necessary to design a production device for PVA gel beads to improve its production efficiency. Utility Model Content

[0005] The utility model provides a polyvinyl alcohol spherical microorganism carrier production device, which can solve the problems of complicated preparation process of polyvinyl alcohol gel beads and low production efficiency in the prior art.

[0006] The utility model provides a polyvinyl alcohol spherical microbial carrier production device, comprising a material tank and a reaction box, wherein a stirring device is arranged inside the material tank; a first pipeline is connected to the bottom of the material tank, the other end of the first pipeline is connected to one end of a centrifugal pump, the other end of the centrifugal pump is connected to a second pipeline, and the other end of the second pipeline is connected to an extrusion device; a reaction box is arranged directly below the extrusion device; a movable screen and a plug flow stirrer are arranged inside the reaction box.

[0007] Preferably, the wall of the material tank is a hollow structure and is filled with heat transfer oil.

[0008] Preferably, the bottom of the material tank is funnel-shaped.

[0009] Preferably, the extrusion device is a hollow tube with a cylindrical outlet end.

[0010] Preferably, the inner diameter of the outlet end of the hollow tube is 3 mm.

[0011] Preferably, the hollow tube outlet is detachably connected to a discharge pipe, and the discharge pipe has a diameter of 3 mm.

[0012] Preferably, the discharge pipe includes an inlet tube and a shunt tube; one end of the inlet tube is connected to the hollow tube, and the other end is provided with a plurality of shunt tubes, and the inner diameter of the shunt tube is 3 mm.

[0013] Preferably, a counterweight is provided outside the reaction box, and the counterweight is connected to the plug flow agitator.

[0014] Preferably, rollers are provided at the bottom of the reaction box.

[0015] Preferably, the reaction box is a cube.

[0016] The beneficial effects of the utility model are:

[0017] The utility model provides a production device for PVA gel beads, including a material tank, an agitator is arranged inside, and an external partition is filled with heat-conducting oil, which can heat the material in the tank, and the bottom is funnel-shaped, and the discharge pipe is connected by a hose. The material is lifted to the extrusion device by a centrifugal pump, and under the action of pressure, the material is squeezed out and drips into a reaction box containing a cross-linking agent. A plug-flow stirring device and a screen are arranged in the reaction box. The purpose of the plug-flow stirring device is to circulate the cross-linking agent in the reaction box to play a stirring role, and the function of the screen is to facilitate the extraction of the cross-linked gel beads.

[0018] The extrusion device is made of stainless steel, and the end of the discharge pipe is connected to a stainless steel hollow tube with a diameter of 3 mm, and the connection is a threaded connection. The diameter of the discharge pipe can be changed according to the diameter of the prepared carrier.

[0019] The reaction box is made of stainless steel and is provided with a screen inside. The screen is made of stainless steel to facilitate the extraction of the prepared gel balls. Rollers are provided at the bottom to facilitate transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model provides a cross-sectional schematic diagram of a polyvinyl alcohol spherical microbial carrier production device.

[0021] Figure 2 This is an enlarged view of a discharge pipe in a polyvinyl alcohol spherical microbial carrier production device provided by the utility model.

[0022] Description of reference numerals:

[0023] 1. Stirring device, 2. Material tank, 3. Centrifugal pump, 4. Extrusion device, 5. Plug flow agitator, 6. Reaction box, 7. Screen, 8. Discharge pipe, 9. Counterweight. DETAILED DESCRIPTION

[0024] A specific implementation of the present utility model is described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present utility model is not limited by the specific implementation mode.

[0025] The present invention provides a polyvinyl alcohol spherical microorganism carrier production device, such as Figure 1 As shown, it includes a material tank 2 and a reaction box 6, and the material tank 2 and the reaction box 6 both have a hollow structure to facilitate the accommodation and processing of materials. The material tank 2 is supported by a stainless steel pipe with a height of 30-40cm. A stirring device 1 is arranged inside the material tank 2, and the stirring device 1 is fixed in the material tank, and the material tank is supported by a stainless steel bracket, and the supporting point is at the tank mouth. The stirring device 1 is used to fully stir the material in the material tank 2 for subsequent treatment and processing. The bottom of the material tank 2 is connected to a first pipeline, and the other end of the first pipeline is connected to one end of a centrifugal pump 3. Through this connection, the material in the material tank 2 can be extracted by the centrifugal pump 3 and transported to the next process. The other end of the centrifugal pump 3 is connected to a second pipeline, and the other end of the second pipeline is connected to an extrusion device 4. All the pipelines are as short as possible under the conditions of ensuring connection. The extrusion device 4 is a hollow tube, and the material can be dripped into the cross-linking agent of the reaction box 6 through the extrusion device 4 by the power of the centrifugal pump 3 during the specific experiment.

[0026] Further, a discharge pipe 8 is connected to the outlet end of the extrusion device 4, and a reaction box 6 is arranged directly below the discharge pipe 8. The distance between the discharge pipe 8 and the reaction box 6 is 10-15cm. A movable screen 7 is arranged inside the reaction box 6, and the gel balls fall into the movable screen 7. The movable screen 7 is convenient for taking out the cross-linked gel balls. The movable screen 7 is made of stainless steel. To ensure that the polyvinyl alcohol gel balls fall into the screen without falling, the screen 7 is selected as a 100-mesh screen. A plug flow agitator 5 is arranged inside the reaction box 6 away from the extrusion device 4. The plug flow agitator 5 can keep the cross-linking agent uniform at all times and prevent the polyvinyl alcohol gel balls from sticking when dripping.

[0027] Furthermore, in order to improve the working efficiency and stability of the plug-flow agitator 5, a counterweight 9 is connected at one end thereof. The counterweight 9 is connected to the plug-flow agitator 5 through a stainless steel tube, one end of which is located inside the reaction box 6, and the other end of which passes through an opening at the upper end of the reaction box 6 and is connected to the counterweight 9. The function of the counterweight 9 is to balance the centrifugal force generated by the plug-flow agitator 5 when rotating at a high speed, thereby ensuring that the plug-flow agitator 5 can work stably.

[0028] like Figure 1 As shown, a polyvinyl alcohol spherical microorganism carrier production device provided by the embodiment of the utility model also includes a material tank 2 made of stainless steel, and its bottom is designed in a funnel shape, which can achieve high-speed flow and acceleration of liquid and help the rapid transfer of liquid. The tank wall adopts a hollow structure, and the interior of the hollow tank wall is filled with heat transfer oil, thereby realizing the heating function of the material. The heat transfer oil is purchased from Xingyu Heat Transfer Oil Manufacturing Co., Ltd. WD-300 type.

[0029] like Figure 1 As shown, a polyvinyl alcohol spherical microorganism carrier production device provided by an embodiment of the utility model also includes a reaction box 6 with rollers at the bottom to facilitate the transportation of the PVA gel balls.

[0030] like Figure 1 As shown, a polyvinyl alcohol spherical microorganism carrier production device provided by the embodiment of the utility model also includes an extrusion device 4, which is a stainless steel hollow tube with a cylindrical outlet end, the inner diameter of the stainless steel hollow tube outlet end is 3mm, and the outlet of the hollow tube is detachably connected with a discharge pipe 8, the connection is a threaded connection, the discharge pipe 8 has a diameter of 3mm, and the discharge pipe diameter can be changed according to the particle size of the prepared carrier. Preferably, the extrusion device 4 is made of stainless steel to withstand greater pressure.

[0031] like Figure 2As shown, a polyvinyl alcohol spherical microorganism carrier production device provided by an embodiment of the utility model also includes the discharge pipe 8 including a sample feeding tube 81 and a shunt tube 82. One end of the sample feeding tube 81 is connected to the hollow tube, and the other end is provided with a plurality of shunt tubes 82. The inner diameter of the shunt tube 82 is 3 mm. By connecting the sample feeding tube 81 with the plurality of shunt tubes 82, it is ensured that the material is evenly distributed after entering the shunt tube, which helps to obtain spherical microorganism carriers of uniform size and shape during the production process, and improves the consistency and quality of the product. In the embodiment of the utility model, a total of 7 shunt tubes are provided to shunt the material. The design of multiple shunt tubes to shunt the material allows the discharge amount of each shunt tube to be accurately controlled, and multiple spherical microorganism carriers can be produced at the same time, which significantly improves the production efficiency.

[0032] The working principle of this embodiment is as follows:

[0033] PVA (polyvinyl alcohol) and SA (sodium alginate) are added to the material tank, water is added, and the mixture is heated, stirred and dissolved uniformly. The heating temperature is 90-100 ° C, and the stirring speed can be set to 150-300 rpm to form a PVA-SA mixed solution, and then cooled to room temperature for standby use. Then, calcium chloride borate is dissolved in water and placed in a reaction box, and the plug flow stirring device is turned on to mix the boric acid and calcium chloride uniformly to prepare a mixed solution containing boric acid and calcium chloride, which is a cross-linking agent. Turn on the centrifugal pump, and transport the PVA-SA mixed solution to the extrusion device. Under pressure, the material is dripped into the cross-linking agent to obtain PVA gel beads. The pressure of the extrusion device comes from the centrifugal pump, and the outlet of the extrusion device is a stainless steel hollow tube with a terminal diameter of 3mm, and the cross-linking time is greater than 20 hours. The obtained PVA gel beads are taken out, washed, and soaked in a phosphate solution for esterification. After the esterification is completed, wash to obtain PVA gel beads. The PVA gel beads prepared by the above method are spherical with a diameter of 34-40mm.

[0034] The principle of using the PVA gel beads prepared by the above method as carriers is that the cross-linking reaction between sodium alginate and calcium ions is almost instantaneous, so that the droplets quickly form a smooth and non-sticky surface, thereby preventing the adhesion and aggregation between the beads, thereby achieving the purpose of improving the spheroidization of the PVA solution. Boric acid, as a cross-linking agent for PVA, generates a polymer network structure inside the beads. Phosphate solution can esterify polyvinyl alcohol to achieve the purpose of enhancing its toughness and reducing its water solubility.

[0035] In summary, the utility model has a material tank with an agitator inside, a hollow side wall, and heat transfer oil inside to achieve heating of the material; a movable screen and a plug-flow agitator are provided inside the reaction box, the screen can conveniently take out the prepared carrier, and the plug-flow agitator makes the cross-linking agent circulate in the reaction box to play a stirring role; a centrifugal pump can transport the material in the material tank to the extrusion device, and the material is dripped into the cross-linking agent in the reaction box through the extrusion device, and the outlet connection of the extrusion device 4 is a threaded connection, which can be replaced according to the particle size of the prepared carrier. The utility model is simple in equipment and easy to operate, which improves the preparation efficiency of PVA gel beads.

[0036] The above describes the utility model and its implementation methods, which are not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and do not deviate from the purpose of the invention of the utility model, they can creatively design a structure and embodiment similar to the technical solution, which should belong to the protection scope of the utility model.

Claims

1. A polyvinyl alcohol spherical microbial carrier production device, characterized in that: The invention comprises a material tank (2) and a reaction box (6), wherein a stirring device (1) is arranged inside the material tank (2); a first pipeline is connected to the bottom of the material tank (2), the other end of the first pipeline is connected to one end of a centrifugal pump (3), the other end of the centrifugal pump (3) is connected to a second pipeline, and the other end of the second pipeline is connected to an extrusion device (4); a reaction box (6) is arranged directly below the extrusion device (4); a movable screen (7) and a plug-flow agitator (5) are arranged inside the reaction box (6).

2. The polyvinyl alcohol spherical microorganism carrier production device according to claim 1, characterized in that: The wall of the material tank (2) is a hollow structure and is filled with heat transfer oil.

3. The polyvinyl alcohol spherical microorganism carrier production device according to claim 1, characterized in that: The bottom of the material tank (2) is funnel-shaped.

4. The polyvinyl alcohol spherical microorganism carrier production device according to claim 1, characterized in that: The extrusion device (4) is a hollow tube with a cylindrical outlet end.

5. The polyvinyl alcohol spherical microorganism carrier production device according to claim 4, characterized in that: The inner diameter of the outlet end of the hollow tube is 3 mm.

6. The polyvinyl alcohol spherical microorganism carrier production device according to claim 4, characterized in that: The outlet of the hollow tube is detachably connected to a discharge pipe (8), and the diameter of the discharge pipe (8) is 3 mm.

7. The polyvinyl alcohol spherical microorganism carrier production device according to claim 6, characterized in that: The discharge pipe (8) comprises a sample inlet pipe (81) and a flow diversion pipe (82); One end of the sample injection tube (81) is connected to the hollow tube, and the other end is provided with a plurality of shunt tubes (82), wherein the inner diameter of the shunt tubes (82) is 3 mm.

8. The polyvinyl alcohol spherical microorganism carrier production device according to claim 1, characterized in that: A counterweight (9) is provided outside the reaction box (6), and the counterweight (9) is connected to the plug flow stirrer (5).

9. The polyvinyl alcohol spherical microorganism carrier production device according to claim 1, characterized in that: The bottom of the reaction box (6) is provided with rollers.

10. The polyvinyl alcohol spherical microorganism carrier production device according to claim 1, characterized in that: The reaction box (6) is a cube.

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