Bean dreg biological activated carbon adsorbent for removing Cr (VI) as well as preparation method and device of bean dreg biological activated carbon adsorbent

Abstract

The invention belongs to the technical field of adsorbent preparation, and particularly relates to a bean dreg biological activated carbon adsorbent for removing Cr (VI) as well as a preparation method and a device thereof, and the formula comprises the following components in parts by weight: 80-90 parts of basic bean dreg activated carbon, 200-400 parts of dried bean dregs, 50-100 parts of wooden activated carbon, 20-60 parts of bentonite, 5-20 parts of an activating agent, 50-150 parts of water, 30-40 parts of a fecl3 solution and 20-50 parts of a hydrochloric acid solution. Wooden activated carbon, bentonite and an activating agent are added into a formula, the pore structure and the specific surface area of bean dreg biological activated carbon are enhanced, and therefore the Cr (VI) adsorption capacity of the bean dreg biological activated carbon is improved, accurate adjusting and controlling mechanisms are designed for a grinding assembly, a material mixing assembly and a drying assembly in the device, and the quality of the bean dreg biological activated carbon is improved. The stability and consistency of the preparation process are ensured, so that the stability of a final product is improved; the bean dreg biological activated carbon adsorbent prepared by the method is not only suitable for treating low-concentration wastewater, but also can cope with the fluctuation of wastewater quality and the change of operation conditions to a certain extent, so that the adaptability and the flexibility are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of adsorbent preparation, and in particular relates to a bean dregs bio-activated carbon adsorbent for removing Cr(VI) and a preparation method and device thereof. Background Art

[0002] Bean dregs bio-activated carbon adsorbent is made from bean dregs in kitchen waste through a series of treatment processes and has a high efficiency in removing Cr(VI). Its characteristics may include high specific surface area, rich microporous structure and good chemical stability, which enable bean dregs bio-activated carbon adsorbent to effectively adsorb Cr(VI) ions in water.

[0003] Generally, bean dregs collected from kitchen waste are used as the raw material for preparation. The collected bean dregs are dried to remove moisture. This step can be achieved by air drying in a ventilated outdoor place combined with oven drying. The dried bean dregs are crushed and sieved to obtain bean dregs particles with a certain particle size range. Due to the limitations of the adsorption and regeneration properties of bean dregs bio-activated carbon, it is only suitable for treating low-concentration or specific types of wastewater, and the operating stability of the bean dregs bio-activated carbon adsorption device is affected by many factors, such as fluctuations in wastewater quality, changes in operating conditions, etc., which will lead to unstable treatment effects and even failure to achieve the expected removal effect.

[0004] Therefore, a bean curd dregs bio-activated carbon adsorbent for removing Cr(VI) and a preparation method and device thereof are designed to solve the above problems. Summary of the invention

[0005] To solve the problems raised in the above background technology. The present invention provides a bean dregs bio-activated carbon adsorbent for removing Cr(VI) and a preparation method and device thereof. Due to the limitations of the adsorption performance and regeneration performance of bean dregs bio-activated carbon, it is only suitable for treating low-concentration or specific types of wastewater, and the operating stability of the bean dregs bio-activated carbon adsorption device is affected by many factors, such as wastewater quality fluctuations, changes in operating conditions, etc., which will lead to unstable treatment effects and even fail to achieve the expected removal effect.

[0006] To achieve the above object, the present invention provides the following technical scheme: a method for preparing a bean dregs bio-activated carbon adsorbent for removing Cr(VI), wherein the formula comprises, by weight: 80-90 parts of basic bean dregs activated carbon, 200-400 parts of dried bean dregs, 50-100 parts of wood activated carbon, 20-60 parts of bentonite, 5-20 parts of an activator, 50-150 parts of water, 30-40 parts of a FeCl3 solution, and 20-50 parts of a hydrochloric acid solution;

[0007] The preparation method thereof comprises:

[0008] S1. Evenly mix the dried bean dregs with wood activated carbon, bentonite and activator, and add appropriate amount of water to form a wet mixture;

[0009] S2, grinding the activated mixture to obtain a fine powdery substance;

[0010] S3, immersing the ground bean curd activated carbon in a mixed solution of FeCl3 and hydrochloric acid for surface modification;

[0011] S4, fully washing the modified bean dregs activated carbon to remove the residual modification solution, and drying the washed activated carbon;

[0012] S5. The adsorbent is further subjected to thermal or chemical treatment to improve its stability and adsorption performance.

[0013] A device for preparing a bean curd dregs bio-activated carbon adsorbent for removing Cr(VI), comprising a feed box, an inclined filter plate, a suction fan, a guide pipe, a mixing component, a grinding component and a drying component, wherein the inclined filter plate is threadedly connected to the interior of the feed box, the input end of the suction fan is fixedly connected to the surface of the guide pipe, the bottom of the guide pipe passes through the bottom inner wall of the grinding component and is welded and fixed to the inner surface of the grinding component, the mixing component is arranged at the lower end of the discharge port of the feed box, and the drying component is arranged below the discharge port of the mixing component.

[0014] Preferably, the grinding assembly includes a grinding box, a lower material bin, a driving motor, a driving shaft, a guide shaft and a pointed cone block; the bottom of the grinding box is fixedly connected to the top of the lower material bin, the driving motor is threadedly connected to one side of the grinding box, the inner side of the driving shaft is fixedly connected to the motor shaft of the driving motor through a coupling, the guide shaft is movably connected to the inside of the grinding box, and the pointed cone block is fixedly connected to the surfaces of the driving shaft and the guide shaft.

[0015] Preferably, the mixing assembly includes a mixing box, a DC motor, a rotating shaft, a mixing rod, a socket disk, a multi-claw bracket, an elastic rubber pad and a connecting pipe, the two sides of the connecting pipe are respectively fixedly connected to the surface of the lower hopper and the mixing box, the DC motor is installed on the top of the mixing box, the rotating shaft is fixedly connected to the outside of the output end of the DC motor, the mixing rod is welded to the outer wall of the rotating shaft, the socket disk is sleeved on the outside of the rotating shaft, the multi-claw bracket is fixedly connected to the outside of the socket disk, and the elastic rubber pad is fixedly connected to the outside of the multi-claw bracket.

[0016] Preferably, the drying assembly includes a screening box, a drying box, a dryer and a collecting tank, the screening box is arranged below the discharge end of the mixing box, the drying box is fixedly connected to the outside of the screening box, the dryer is installed on one side of the drying box, and the collecting tank is fixedly connected to the outside of the drying box.

[0017] Preferably, three groups of screen frames are further arranged inside the screening box, and the inner diameters of the meshes of the three groups of screen frames decrease successively from the top of the screening box.

[0018] Preferably, a belt conveyor platform and a storage plate for receiving materials are installed inside the drying box. The storage plate is installed inside the collecting tank and is used to collect materials conveyed by the belt conveyor platform.

[0019] Preferably, the driving shaft and one side of the guide shaft are also meshedly connected with a locking gear.

[0020] Preferably, the concentration of the Fecl3 solution is 0.3-0.5 mol / L, and the Fecl3 solution is used for surface modification to enhance Cr adsorption.

[0021] Preferably, the concentration of the hydrochloric acid solution is 1.0-2.0 mol / L, and the hydrochloric acid solution is used to adjust the pH value and promote the modification reaction.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, by adding wood activated carbon, bentonite and activator into the formula, the pore structure and specific surface area of ​​bean dregs bio-activated carbon are enhanced, thereby improving its adsorption capacity for Cr(VI).

[0024] 2. In the present invention, the grinding component, mixing component and drying component in the preparation device are designed with precise adjustment and control mechanisms to ensure the stability and consistency of the preparation process, thereby improving the stability of the final product.

[0025] 3. In the present invention, the bean dregs bioactivated carbon adsorbent prepared by this method is not only suitable for treating low-concentration wastewater, but also can cope with the fluctuation of wastewater quality and changes in operating conditions to a certain extent, thereby improving its adaptability and flexibility in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is a schematic diagram of the tree structure of the preparation method of the present invention;

[0029] Figure 3 is a distribution diagram of the connecting pipes in the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the mixing component in the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of the multi-claw bracket and the elastic rubber pad in the present invention;

[0032] Figure 6 It is a schematic diagram of the structure inside the screening box of the present invention;

[0033] Figure 7 It is a schematic diagram of the structure inside the drying box of the present invention;

[0034] Figure 8 It is a schematic diagram of the structure of the grinding assembly in the present invention;

[0035] Fig. 9 It is a structural schematic diagram of the raw material ratio in the present invention.

[0036] In the figure:

[0037] 1. Feed box; 2. Inclined filter plate; 3. Suction fan; 4. Guide pipe;

[0038] 5. Mixing assembly; 51. Mixing box; 52. DC motor; 53. Rotating shaft; 54. Mixing rod; 55. Socket plate; 56. Multi-claw bracket; 57. Elastic rubber pad; 58. Connecting pipe;

[0039] 6. Grinding assembly; 61. Grinding box; 62. Unloading bin; 63. Driving motor; 64. Driving shaft; 65. Guide shaft; 66. Cone block;

[0040] 7. Drying assembly; 71. Screening box; 72. Drying box; 73. Dryer; 74. Collection tank;

[0041] 8. Screen frame; 9. Belt conveyor table; 10. Storage plate; 11. Locking gear. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of 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.

[0043] like Figure 1-8 A method for preparing a bean dregs bio-activated carbon adsorbent for removing Cr(VI) is shown: the formula includes, by weight: 80-90 parts of basic bean dregs activated carbon, 200-400 parts of dried bean dregs, 50-100 parts of wood activated carbon, 20-60 parts of bentonite, 5-20 parts of activator, 50-150 parts of water, 30-40 parts of FeCl3 solution, and 20-50 parts of hydrochloric acid solution;

[0044] The preparation method thereof comprises:

[0045] S1. Evenly mix the dried bean dregs with wood activated carbon, bentonite and activator, and add appropriate amount of water to form a wet mixture;

[0046] S2, grinding the activated mixture to obtain a fine powdery substance;

[0047] S3, immersing the ground bean curd activated carbon in a mixed solution of FeCl3 and hydrochloric acid for surface modification;

[0048] S4, fully washing the modified bean dregs activated carbon to remove the residual modification solution, and drying the washed activated carbon;

[0049] S5. The adsorbent is further subjected to thermal or chemical treatment to improve its stability and adsorption performance.

[0050] A device for preparing a bean curd dregs bioactivated carbon adsorbent for removing Cr(VI), comprising a feed box 1, an inclined filter plate 2, a suction fan 3, a guide pipe 4, a mixing component 5, a grinding component 6 and a drying component 7, wherein the inclined filter plate 2 is threadedly connected to the interior of the feed box 1, the input end of the suction fan 3 is fixedly connected to the surface of the guide pipe 4, the bottom of the guide pipe 4 passes through the bottom inner wall of the grinding component 6 and is welded and fixed to the inner surface of the grinding component 6, the mixing component 5 is arranged at the lower end of the discharge port of the feed box 1, and the drying component 7 is arranged below the discharge port of the mixing component 5.

[0051] The grinding assembly 6 includes a grinding box 61, a lower material bin 62, a driving motor 63, a driving shaft 64, a guide shaft 65 and a pointed cone block 66. The bottom of the grinding box 61 is fixedly connected to the top of the lower material bin 62, the driving motor 63 is threadedly connected to one side of the grinding box 61, the inner side of the driving shaft 64 is fixedly connected to the motor shaft of the driving motor 63 through a coupling, the guide shaft 65 is movably connected to the inside of the grinding box 61, and the pointed cone block 66 is fixedly connected to the surface of the driving shaft 64 and the guide shaft 65.

[0052] The mixing assembly 5 includes a mixing box 51, a DC motor 52, a rotating shaft 53, a mixing rod 54, a socket disk 55, a multi-claw bracket 56, an elastic rubber pad 57 and a connecting pipe 58. The two sides of the connecting pipe 58 are respectively fixedly connected to the lower hopper 62 and the surface of the mixing box 51. The DC motor 52 is installed on the top of the mixing box 51, the rotating shaft 53 is fixedly connected to the outside of the output end of the DC motor 52, the mixing rod 54 is welded to the outer wall of the rotating shaft 53, the socket disk 55 is sleeved on the outside of the rotating shaft 53, the multi-claw bracket 56 is fixedly connected to the outside of the socket disk 55, and the elastic rubber pad 57 is fixedly connected to the outside of the multi-claw bracket 56.

[0053] The drying assembly 7 includes a screening box 71, a drying box 72, a dryer 73 and a collecting tank 74. The screening box 71 is arranged below the discharge end of the mixing box 51, the drying box 72 is fixedly connected to the outside of the screening box 71, the dryer 73 is installed on one side of the drying box 72, and the collecting tank 74 is fixedly connected to the outside of the drying box 72.

[0054] Three groups of screen frames 8 are further arranged inside the screening box 71 , and the inner diameters of the meshes of the three groups of screen frames 8 decrease in sequence from the top of the screening box 71 .

[0055] A belt conveyor platform 9 and a storage plate 10 for receiving materials are also installed inside the drying box 72. The storage plate 10 is installed inside the collecting tank 74 and is used to collect materials conveyed by the belt conveyor platform 9.

[0056] One side of the driving shaft 64 and the guide shaft 65 is also meshedly connected with a locking gear 11 .

[0057] The concentration of the Fecl3 solution is 0.3-0.5 mol / L, and the Fecl3 solution is used for surface modification to enhance Cr adsorption.

[0058] The concentration of the hydrochloric acid solution is 1.0-2.0 mol / L, and the hydrochloric acid solution is used to adjust the pH value and promote the modification reaction.

[0059] Working principle: Mix the dried bean dregs, wood activated carbon, bentonite and activator in proportion, and add an appropriate amount of water to form a wet mixture. In this step, the amount of water added needs to be moderate to ensure that the mixture can form a suitable wet state and facilitate the subsequent grinding process. The activated mixture is sent to the grinding assembly 6 for grinding to obtain a fine powdery substance. The grinding assembly 6 drives the drive shaft 64 and the guide shaft 65 to rotate through the drive motor 63, driving the pointed cone block 66 to grind the mixture efficiently. The setting of the locking gear 11 ensures the stable operation of the drive shaft 64 and the guide shaft 65, and avoids vibration and deviation during the grinding process. The ground bean dregs activated carbon is immersed in a mixed solution of FeCl3 and hydrochloric acid for surface modification. The FeCl3 solution, as a modifier, can enhance the adsorption capacity of activated carbon for Cr(VI); the hydrochloric acid solution is used to adjust the pH value and promote the modification reaction. The modified bean dregs activated carbon is fully washed to remove the residual modification solution. The washed activated carbon is sent to the drying assembly 7 for drying treatment to obtain the final bean dregs bio-activated carbon adsorbent. The drying assembly 7 uses the dryer 73 to efficiently dry the material, ensuring the dryness and stability of the adsorbent. During operation, the inclined filter plate performs preliminary filtration and separation on the raw materials to remove impurities and unqualified particles. The suction fan 3 sucks the raw materials into the grinding assembly 6 through the guide pipe 4. After the drive motor 63 is started, the drive shaft 64 and the guide shaft 65 are driven to rotate through the coupling. The pointed cone block 66 generates friction and extrusion with the inner wall of the grinding box 61 during the rotation process, and the mixture is efficiently ground. The setting of the locking gear 11 ensures the stable operation of the drive shaft 64 and the guide shaft 65, and the ground mixture enters the mixing assembly 5 through the connecting pipe 58. After the DC motor 52 is started, it drives the rotating shaft 53 to rotate, and the mixing rod 54 mixes the mixture with the raw materials such as the activator evenly during the rotation process. The mixture is then immersed in a mixed solution of FeCl3 and hydrochloric acid for surface modification treatment, and the screened material enters the drying box 72 for drying treatment. The dryer 73 uses hot air to efficiently dry the material, ensuring the dryness and stability of the adsorbent. The dried adsorbent is finally collected in a collection tank 74 for standby use.

[0060] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a bean curd dregs bioactivated carbon adsorbent for removing Cr(VI), characterized in that: The formula includes, by weight: 80-90 parts of basic bean dregs activated carbon, 200-400 parts of dried bean dregs, 50-100 parts of wood activated carbon, 20-60 parts of bentonite, 5-20 parts of activator, 50-150 parts of water, 30-40 parts of FeCl3 solution, and 20-50 parts of hydrochloric acid solution; The preparation method thereof comprises: S1. Evenly mix the dried bean dregs with wood activated carbon, bentonite and activator, and add appropriate amount of water to form a wet mixture; S2, grinding the activated mixture to obtain a fine powdery substance; S3, immersing the ground bean curd activated carbon in a mixed solution of FeCl3 and hydrochloric acid for surface modification; S4, fully washing the modified bean dregs activated carbon to remove the residual modification solution, and drying the washed activated carbon; S5. The adsorbent is further subjected to thermal or chemical treatment to improve its stability and adsorption performance.

2. The device for preparing bean curd dregs bio-activated carbon adsorbent for removing Cr(VI) according to claim 1, characterized in that: The invention comprises a feed box (1), an inclined filter plate (2), a suction fan (3), a guide pipe (4), a mixing component (5), a grinding component (6) and a drying component (7); the inclined filter plate is threadedly connected to the inside of the feed box (1); the input end of the suction fan (3) is fixedly connected to the surface of the guide pipe (4); the bottom of the guide pipe (4) passes through the bottom inner wall of the grinding component (6) and is welded and fixed to the inner surface of the grinding component (6); the mixing component (5) is arranged at the lower end of the discharge port of the feed box (1); and the drying component (7) is arranged below the discharge port of the mixing component (5).

3. The device for preparing bean curd dregs bio-activated carbon adsorbent for removing Cr(VI) according to claim 2, characterized in that: The grinding assembly (6) comprises a grinding box (61), a lower material bin (62), a driving motor (63), a driving shaft (64), a guide shaft (65) and a pointed cone block (66); the bottom of the grinding box (61) is fixedly connected to the top of the lower material bin (62); the driving motor (63) is threadedly connected to one side of the grinding box (61); the inner side of the driving shaft (64) is fixedly connected to the motor shaft of the driving motor (63) through a coupling; the guide shaft (65) is movably connected to the inside of the grinding box (61); and the pointed cone block (66) is fixedly connected to the surfaces of the driving shaft (64) and the guide shaft (65).

4. The device for preparing bean curd dregs bio-activated carbon adsorbent for removing Cr(VI) according to claim 3, characterized in that: The mixing assembly (5) comprises a mixing box (51), a DC motor (52), a rotating shaft (53), a mixing rod (54), a sleeve disc (55), a multi-claw bracket (56), an elastic rubber pad (57) and a connecting pipe (58). The two sides of the connecting pipe (58) are respectively fixedly connected to the surface of the lower bin (62) and the mixing box (51). The DC motor (52) is installed on the top of the mixing box (51). The rotating shaft (53) is fixedly connected to the outer side of the output end of the DC motor (52). The mixing rod (54) is welded to the outer wall surface of the rotating shaft (53). The sleeve disc (55) is sleeved on the outer side of the rotating shaft (53). The multi-claw bracket (56) is fixedly connected to the outer side of the sleeve disc (55). The elastic rubber pad (57) is fixedly connected to the outer side of the multi-claw bracket (56).

5. The device for preparing bean curd dregs bio-activated carbon adsorbent for removing Cr(VI) according to claim 4, characterized in that: The drying assembly (7) comprises a screening box (71), a drying box (72), a drying machine (73) and a collecting tank (74); the screening box (71) is arranged below the discharge end of the mixing box (51); the drying box (72) is fixedly connected to the outside of the screening box (71); the drying machine (73) is installed on one side of the drying box (72); and the collecting tank (74) is fixedly connected to the outside of the drying box (72).

6. The device for preparing bean curd dregs bio-activated carbon adsorbent for removing Cr(VI) according to claim 5, characterized in that: Three groups of screen frames (8) are further arranged inside the screening box (71), and the inner diameters of the mesh holes of the three groups of screen frames (8) decrease in sequence from the top of the screening box (71).

7. The device for preparing bean curd dregs bio-activated carbon adsorbent for removing Cr(VI) according to claim 5, characterized in that: A belt conveyor platform (9) and a storage plate (10) for receiving materials are also installed inside the drying box (72). The storage plate (10) is installed inside the collecting tank (74) and is used to collect materials conveyed by the belt conveyor platform (9).

8. The device for preparing bean curd dregs bio-activated carbon adsorbent for removing Cr(VI) according to claim 3, characterized in that: The driving shaft (64) and one side of the guide shaft (65) are also meshedly connected with a locking gear (11).

9. The device for preparing bean curd dregs bio-activated carbon adsorbent for removing Cr(VI) according to claim 1, characterized in that: The concentration of the Fecl3 solution is 0.3-0.5 mol / L, and the Fecl3 solution is used for surface modification to enhance Cr adsorption.

10. The device for preparing bean curd dregs bio-activated carbon adsorbent for removing Cr(VI) according to claim 1, characterized in that: The concentration of the hydrochloric acid solution is 1.0-2.0 mol / L, and the hydrochloric acid solution is used to adjust the pH value and promote the modification reaction.

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