Rapid decolorization device for dye wastewater based on biochar synergistic with persulfate catalysis

Abstract

The present invention discloses a rapid decolorization device for dye wastewater based on biochar and persulfate catalysis. Along the direction of the dye wastewater to be treated, the device comprises: an activation chamber, which has an activation zone with a metal-modified adsorption material; a first adsorption chamber and a second adsorption chamber, which are provided with adsorption materials and are both connected to the activation chamber; wherein the dye wastewater to be treated is first mixed with persulfate before entering the activation chamber. The present invention utilizes metal-modified biochar to efficiently catalyze persulfate to produce SO4 with strong oxidizing properties. ·‑ , quickly converting macromolecular dye molecules into colorless small molecular intermediates, achieving rapid decolorization of dye wastewater, and finally mineralizing it into CO2 and H2O. Subsequently, the pH adjustment and adsorption properties of biochar (non-metal modified) were used to further solve the defects of acidification and partial metal dissolution of the metal modified biochar / persulfate advanced oxidation technology system.

Description

Technical Field

[0001] The present invention relates to the field of dye wastewater treatment equipment, and more specifically, to a dye wastewater rapid decolorization device based on biochar-coordinated persulfate catalysis. Background Art

[0002] With the development of the printing and dyeing industry, the demand for dyes is increasing, and synthetic dyes are gradually developed and mass-produced for use in various industries. Relevant data show that my country produces more than 100,000 types of commercial dyes each year, with an output of up to 700,000 tons. Although the emergence of synthetic dyes has solved the problem of natural dye decolorization, it has also brought new problems. Since the dye mixture (dye molecules and chemicals) cannot be completely attached to fabrics or textiles, about 20% of the dyes will be lost and wasted during the printing and dyeing process. In addition, synthetic dye molecules contain co-pigments (water-soluble bonding compounds) and chromophores (color-giving compounds), and their structures are relatively complex and stable, which can resist degradation when in contact with water or other detergents. If wastewater containing high-concentration dyes is discharged into the water environment in large quantities without proper treatment, it will seriously affect the water quality and beauty of the water body, thereby hindering the social functions performed by the ecosystem and threatening the sustainable development of the environment. Therefore, the treatment of dye wastewater is imperative, and the first step is to efficiently destroy the stable chromophore dyes in the dye molecules.

[0003] Therefore, it is urgent to propose a device that can efficiently treat dye wastewater. Summary of the invention

[0004] The purpose of the present invention is to provide a rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, which mainly utilizes metal-modified biochar to efficiently catalyze persulfate to produce SO4 with strong oxidizing properties. ·- , quickly converting macromolecular dye molecules into colorless small molecular intermediates, thereby achieving rapid decolorization of dye wastewater, and finally mineralizing it into CO2 and H2O. Subsequently, the pH adjustment and adsorption properties of biochar (non-metal modified) are used to further solve the defects of acidification and partial metal dissolution of the metal modified biochar / persulfate catalytic system, thereby achieving efficient removal of dye substances in dye wastewater.

[0005] In order to achieve these purposes and other advantages according to the present invention, a rapid decolorization device for dye wastewater based on biochar and persulfate catalysis is provided. Along the direction of the dye wastewater to be treated, the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis comprises:

[0006] An activation chamber having an activation zone in which the metal-modified adsorption material is arranged;

[0007] A first adsorption chamber connected to the activation chamber, wherein an adsorption material is disposed in the first adsorption chamber; and

[0008] a second adsorption chamber, which is connected to the first adsorption chamber, and the second adsorption chamber is provided with adsorption material;

[0009] Wherein, the dye wastewater to be treated is first mixed with persulfate before entering the activation bin.

[0010] In one of the preferred embodiments, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, a plurality of diverter plates are arranged in the activation chamber along the traveling direction of the dye wastewater to be treated, and all the diverter plates and the inner wall of the activation chamber together form a relatively independent space, which is filled with the metal-modified adsorption material to form the activation zone.

[0011] In one preferred embodiment, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, the first adsorption chamber is arranged inside the activation chamber, and the liquid outlet end of the activation chamber is connected to the internal space of the activation chamber, in which the adsorption material is arranged.

[0012] In one preferred embodiment, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, a liquid inlet for the dye wastewater to be treated is arranged at the bottom of the activation bin, the inner diameter of the upper end of the activation bin is larger than the inner diameter of the top of the lower end, and the upper end of the activation bin is open and connected to the interior of the first adsorption bin, so that the activated wastewater can overflow and enter the first adsorption bin.

[0013] In one preferred embodiment, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, the second adsorption bin is mounted on the outside of the activation bin, and the second adsorption bin is located inside the first adsorption bin, the second adsorption bin and the activation bin form an annular second adsorption zone, and the first adsorption bin and the second adsorption bin form an annular first adsorption zone.

[0014] In one preferred embodiment, in the device for rapid decolorization of dye wastewater based on biochar and persulfate catalysis, a support plate is horizontally arranged in the first adsorption zone, and an adsorption material is filled on the support plate;

[0015] A first baffle is disposed in the first adsorption zone, and rotates along the annular first adsorption zone under the impact of the liquid;

[0016] A second baffle is arranged in the second adsorption zone and rotates along the annular second adsorption zone under the impact of liquid.

[0017] In one preferred embodiment, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, the metal-modified adsorption material is prepared by the following steps:

[0018] The waste biomass is pyrolyzed once to obtain biochar particles;

[0019] Mixing the biochar particles with a metal salt solution for modification to obtain a first biochar mixed solution;

[0020] The first biochar mixed liquid is dried, and then subjected to secondary pyrolysis and grinding to obtain the metal-modified biochar.

[0021] In one preferred embodiment, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, the adsorption material is non-metal modified biochar, which is prepared by the following steps:

[0022] The waste biomass is pyrolyzed once to obtain biochar particles;

[0023] Mixing the biochar particles with a chemical solution for modification to obtain a second biochar mixed solution;

[0024] The second biochar mixed liquid is dried, and then subjected to secondary pyrolysis and grinding to obtain the non-metallic modified biochar.

[0025] In one preferred embodiment, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, the metal salt solution is any one or a mixture of the following metal salts: FeCl3, FeSO4, MnCl2, MnSO4, CoCl2 or CoSO4.

[0026] In one preferred embodiment, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, a one-way water inlet is provided below the first adsorption bin to allow the liquid treated by the first adsorption bin to flow into the second adsorption bin;

[0027] The bottom of the activation bin is provided with a drainage end for outputting waste water;

[0028] A backwash water distribution pipe for backwashing is arranged below the first adsorption bin and the second adsorption bin, and the backwash water distribution pipe is connected to an external clean water source.

[0029] The present invention at least includes the following beneficial effects: The device in the present invention mainly utilizes metal-modified biochar to efficiently catalyze persulfate to produce SO4 with strong oxidizing properties. ·-, quickly converting the macromolecular dye molecules into colorless small molecular intermediates, and finally mineralizing them into CO2 and H2O. Then, the pH adjustment and adsorption properties of biochar (non-metal modified) are used to further solve the defects of acidification and partial metal dissolution of the metal modified biochar / persulfate advanced oxidation technology system, thereby achieving efficient removal of dye substances in dye wastewater.

[0030] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of a rapid decolorization device for dye wastewater based on biochar and persulfate catalysis in one embodiment.

[0032] Figure 2 This is a schematic diagram of the structure of a rapid decolorization device for dye wastewater based on biochar and persulfate catalysis in another embodiment. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0034] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0035] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0036] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0037] In order to achieve these purposes and other advantages according to the present invention, a rapid decolorization device for dye wastewater based on biochar synergistic persulfate catalysis is provided, along the direction of movement of the dye wastewater to be treated, such as Figure 1 As shown, the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis comprises:

[0038] An activation chamber 1 having an activation zone 4 in which a metal-modified adsorption material is arranged;

[0039] A first adsorption chamber 2, which is connected to the activation chamber, and an adsorption material is arranged in the first adsorption chamber 2; and

[0040] A second adsorption chamber 3, which is connected to the first adsorption chamber 2, and an adsorption material is arranged in the second adsorption chamber 3;

[0041] Wherein, the dye wastewater to be treated is first mixed with persulfate before entering the activation chamber 1 .

[0042] In the above embodiment, the metal-modified biochar in the activation chamber 1 efficiently catalyzes persulfate to produce SO4 with strong oxidizing properties. ·- , quickly converting the macromolecular dye molecules into colorless small molecular intermediates, and finally mineralizing them into CO2 and H2O, thereby effectively removing the macromolecular dye molecules in the wastewater. The persulfate can be a solid pure persulfate or a liquid persulfate solution, both of which are acceptable, or other raw materials containing persulfate.

[0043] However, the effluent after the activation process inevitably has the problem of acidification and metal ion dissolution. Therefore, in order to solve this problem, the first adsorption chamber 2 and the second adsorption chamber 3 are set after the activation chamber 1. The adsorption materials in the first adsorption chamber 2 and the second adsorption chamber 3 are non-metal modified biochar. The purpose of this setting is: (1) neutralizing the pH value of the effluent; (2) adsorbing dissolved metal ions; (3) adsorbing dye molecules; (4) biochar partially activates PS and consumes persulfate; (5) intercepts suspended matter. Further solve the defects of acidification and partial metal dissolution of the metal modified biochar / persulfate advanced oxidation technology system, thereby achieving efficient removal of dye substances in dye wastewater.

[0044] In the above embodiment, the sewage is first activated by the activation chamber 1, and then enters the first adsorption chamber 2 and the biochar layer therein. Since the biochar layer has a large area and a long hydraulic retention time, sufficient time is provided for biochar adsorption and neutralization. After the adsorption and neutralization of the biochar, the sewage enters the second adsorption chamber 3 for further adsorption treatment.

[0045] It should be further explained that the water inlet 12 of the activation bin 1 is used to inlet sewage, the water outlet of the activation bin 1 is connected to the water inlet of the first adsorption bin 2, the water outlet of the first adsorption bin 2 is connected to the water inlet of the second adsorption bin 3, and the water outlet of the third adsorption bin is for purified water to flow out.

[0046] Furthermore, in order to prolong the contact time between sewage and the metal-modified adsorption material in the activation chamber 1 and improve the activation treatment effect, the water inlet end 12 of the activation chamber 1 may be arranged at the bottom.

[0047] like Figure 2 As shown, in another preferred embodiment, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, a plurality of diverter plates 11 are arranged in the activation bin 1 along the direction of travel of the dye wastewater to be treated, and all the diverter plates 11 and the inner wall of the activation bin 1 together form a relatively independent space, which is not really completely and absolutely independent, but relatively independent relative to other spaces in the activation bin 1, and the metal-modified adsorption material is filled in the relatively independent space to form the activation zone 11. The metal-modified adsorption material can be fixed in the activation zone 11 in a certain manner, such as fixing the metal-modified adsorption material in a mesh structure, and then fixing the mesh structure in the activation zone 11. Now, one distribution mode of the diverter plates 11 is provided as follows, all the diverter plates 11 include a plurality of upper diverter plates located in an annular distribution at the top and a plurality of lower diverter plates located in an annular distribution at the bottom, and the upper diverter plates and the lower diverter plates are respectively inclined, and are relatively oriented to form a relatively independent space.

[0048] In another preferred embodiment, the first adsorption chamber 2 houses the activation chamber, the liquid outlet of the activation chamber 1 is connected to the internal space of the activation chamber 1, and an adsorption material is arranged therein, and the adsorption material is non-metallic modified biochar.

[0049] In one of the preferred embodiments, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, a liquid inlet 12 for the dye wastewater to be treated is provided at the bottom of the activation bin 1, the inner diameter of the upper end of the activation bin 1 is larger than the inner diameter of the top of the lower end, and the upper end of the activation bin 1 is open and connected to the interior of the first adsorption bin 2, so that the activated wastewater can overflow and enter the first adsorption bin 2.

[0050] In more detail, the upper part of the activation bin 1 is a gradually expanding opening (truncate), the middle part is cylindrical, and the lower part is funnel-shaped. In this way, when the water flows too fast, the upper part is a gradually expanding opening, which can slow down the flow rate of the water, allowing it to slowly overflow and flow into the first adsorption bin 2 without splashing waves. An overflow sump is set at the top of the activation bin 1. When sewage flows out of the external dye wastewater storage tank 5 and mixes with the persulfate solution flowing out through the persulfate storage tank 10, it enters the activation zone 4 in the activation bin 1 from the liquid inlet end 12 at the bottom of the activation bin 1. The persulfate is immediately activated by the metal-modified biochar to produce a large amount of active substances with strong oxidizing properties, which then attack the dye molecules in the mixed solution. The macromolecular dye is then decolorized and oxidatively degraded, converted into small molecule intermediates that are easy to handle or completely mineralized into CO2 and H2O. Due to the internal arrangement of the diverter plate 11, the water flows in the activation zone to form a water circulation, which is conducive to the full contact reaction of the metal-modified biochar, persulfate, and dye. The treated water continues to rise to the end of the central activation zone, that is, the top of the activation bin 1, and then overflows into the first adsorption bin 2 through the overflow sump.

[0051] In one preferred embodiment, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, the second adsorption bin 3 is sleeved outside the activation bin 1, and the second adsorption bin 3 is located inside the first adsorption bin 2, the second adsorption bin 3 and the activation bin 1 form an annular second adsorption zone, and the first adsorption bin 2 and the second adsorption bin 3 form an annular first adsorption zone. A one-way water inlet is arranged below the first adsorption bin 2 to allow the liquid treated by the first adsorption bin 2 to flow into the second adsorption bin 3;

[0052] The non-metal modified biochar in the first adsorption chamber 2 further adjusts the pH value of the sewage and adsorbs it, and then enters the second adsorption chamber 3 through the one-way water inlet.

[0053] In one of the preferred embodiments, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, a support plate 21 is horizontally arranged in the first adsorption zone, and adsorption material is filled on the top of the support plate 21; a first baffle 22 is arranged in the first adsorption zone, and rotates along the annular first adsorption zone under the impact of liquid; the first baffle 22 is located below the support plate 21, and the liquid can be stirred without the aid of external power, so that the impurities therein can sink to the bottom and cannot enter the next process for adsorption treatment.

[0054] A second baffle 31 is arranged in the second adsorption zone, which rotates along the annular second adsorption zone under the impact of liquid, and can stir the liquid without the aid of external power, so that the impurities therein sink to the bottom and cannot enter the next process for adsorption treatment.

[0055] In one preferred embodiment, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, the metal-modified adsorption material is prepared by the following steps:

[0056] Waste biomass is pyrolyzed to obtain biochar particles; wherein the waste biomass is one or a combination of sewage sludge, millet bran, straw, peanut shell, cotton shell, wormwood, peach pit; the preparation process of the biochar particles is as follows: waste biomass is used as raw material, crushed and ground, and then placed in a tubular furnace with nitrogen gas for pyrolysis for 1 to 6 hours, and the pyrolysis temperature is 200 to 800°C. The biochar particles obtained by pyrolysis are washed and deashed several times, and then placed in an oven for drying. In order to facilitate later modification, the dried biochar is ground to control its particle size to 0.50 to 0.80 mm.

[0057] The biochar particles are mixed with a metal salt solution for modification to obtain a first biochar mixed solution; the purpose is to successfully load the biochar with a transition metal having high persulfate activation performance. The metal salt solution is a mixture of any one or more transition metal salts, and specifically, for example, it can be a mixture of any one or more of the following metal salts: FeCl3, FeSO4, MnCl2, MnSO4, CoCl2 or CoSO4.

[0058] The first biochar mixed liquid is dried, and then subjected to secondary pyrolysis and grinding to obtain the metal-modified biochar.

[0059] In one preferred embodiment, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, the adsorption material is non-metal modified biochar, which is prepared by the following steps:

[0060] Waste biomass is pyrolyzed to obtain biochar particles; wherein the waste biomass is one or a combination of sewage sludge, millet bran, straw, peanut shell, cotton shell, wormwood, peach pit; the preparation process of the biochar particles is as follows: waste biomass is used as raw material, crushed and ground, and then placed in a tubular furnace with nitrogen gas for pyrolysis for 1 to 6 hours, and the pyrolysis temperature is 200 to 800°C. The biochar particles obtained by pyrolysis are washed and deashed several times, and then placed in an oven for drying. In order to facilitate later modification, the dried biochar is ground to control its particle size to 0.50 to 0.80 mm.

[0061] The biochar particles are mixed with a chemical solution for modification to obtain a second biochar mixture; wherein the modification method is one or more of acid modification, alkali modification, physical modification, oxidant modification, and reductant modification, and the purpose is mainly to change the pore structure of the original biochar, increase the specific surface area, and enhance the adsorption capacity. The chemical solution is phosphoric acid, hydrochloric acid, potassium carbonate, sodium hydroxide, potassium hydroxide, sodium persulfate, etc. Taking phosphoric acid modification as an example, the preparation steps of phosphoric acid modified biochar are as follows: the biochar particles are put into a phosphoric acid solution with a mass percentage of 50%, fully immersed, and the mixed solution is placed in a constant temperature water bath shaker, and oscillated for 3 hours at 50°C and a speed of 160rpm / min. Taking potassium carbonate modification as an example, the preparation steps of potassium carbonate modified biochar are as follows: the biochar particles are put into a potassium carbonate solution with a mass percentage of 23%, fully immersed, and the mixed solution is placed in a constant temperature water bath shaker, and oscillated at 35°C and a speed of 200rpm / min.

[0062] The second biochar mixed liquid is dried, and then subjected to secondary pyrolysis and grinding to obtain the metal-modified biochar and the non-metal-modified biochar.

[0063] In one preferred embodiment, in the rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, a drainage end for outputting wastewater is provided at the bottom of the activation bin 1, which is controlled by a valve;

[0064] When the metal-modified biochar used to activate persulfate in the activation bin 1 loses its activity, the water inlet 12 of the dye wastewater and persulfate mixture is closed, and the valve for controlling clean water is opened (the water inlet 12 of the activation bin 1 is also connected to an external clean water source 7), and the water flow rate is increased. Due to the effect of the strong water flow, the metal-modified biochar can easily flow out with the water flow and be discharged into the first adsorption bin 2. Due to the fast flow rate and the fast activation reaction speed in the activation zone 11, the metal-modified biochar will gradually lose its activity against persulfate, but it still has good adsorption performance, because the adsorption rate is slower than that of advanced oxidation. Therefore, the metal-modified biochar can still play its adsorption role after entering the first adsorption bin 2.

[0065] A backwash water distribution pipe 6 for backwashing is disposed below the first adsorption bin and the second adsorption bin, and the backwash water distribution pipe 6 is connected to an external clean water source 7. In practical applications, valves and pumps for controlling the opening and closing of each pipeline are installed on each pipeline.

[0066] Specifically, a recovery pipe 8 is also provided, one end of which is connected to the first adsorption bin 2 and the second adsorption bin 3 so as to adsorb and recycle the biochar (metal-modified biochar and non-metal-modified biochar) therein, and the other end of the recovery pipe 8 is connected to a biochar recovery pool 9.

[0067] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A rapid decolorization device for dye wastewater based on biochar and persulfate catalysis, characterized in that: Along the direction of the dye wastewater to be treated, the dye wastewater rapid decolorization device based on biochar and persulfate catalysis includes: An activation chamber having an activation zone in which the metal-modified biochar is arranged; a first adsorption chamber connected to the activation chamber, wherein an adsorption material is arranged in the first adsorption chamber, and the adsorption material is non-metal modified biochar; and a second adsorption chamber, which is connected to the first adsorption chamber, wherein an adsorption material is arranged in the second adsorption chamber, and the adsorption material is non-metal modified biochar; Wherein, the dye wastewater to be treated is first mixed with persulfate before entering the activation chamber; A plurality of diverter plates are arranged in the activation bin along the direction of flow of the dye wastewater to be treated, and all the diverter plates and the inner wall of the activation bin together form a relatively independent space, and the metal-modified biochar is filled in the space to form the activation zone; The first adsorption chamber covers the activation chamber, the liquid outlet of the activation chamber is connected to the internal space of the activation chamber, and the adsorption material is arranged in the space between the first adsorption chamber and the activation chamber; The bottom of the activation bin is provided with a liquid inlet for the dye wastewater to be treated to enter, the inner diameter of the upper end of the activation bin is larger than the inner diameter of the top of the lower end, the upper end of the activation bin is open and communicated with the interior of the first adsorption bin, so that the activated wastewater overflows and enters the first adsorption bin; The second adsorption chamber is sleeved outside the activation chamber, and the second adsorption chamber is located inside the first adsorption chamber, the second adsorption chamber and the activation chamber form an annular second adsorption zone, and the first adsorption chamber and the second adsorption chamber form an annular first adsorption zone; A support plate is disposed transversely in the first adsorption area, and adsorption material is filled on the support plate; A first baffle is disposed in the first adsorption zone, and rotates along the annular first adsorption zone under the impact of the liquid; A second baffle is arranged in the second adsorption zone, and rotates along the annular second adsorption zone under the impact of the liquid; A one-way water inlet is provided below the first adsorption bin to allow the liquid treated by the first adsorption bin to flow into the second adsorption bin; The bottom of the activation bin is provided with a drainage end for outputting waste water; A backwash water distribution pipe for backwashing is disposed below the first adsorption bin and the second adsorption bin, and the backwash water distribution pipe is connected to an external clean water source; All the diverter plates include a plurality of upper diverter plates located above and distributed in an annular direction and a plurality of lower diverter plates located below and distributed in an annular direction, and the upper diverter plates and the lower diverter plates are respectively inclined and face each other to form a relatively independent space; The activation chamber has an upper portion that is gradually expanded and has a cylindrical middle portion and a funnel-shaped lower portion; An overflow sump is arranged at the top of the activation bin. When sewage flows out from the external dye wastewater storage tank and mixes with the persulfate solution flowing out from the persulfate storage tank, it enters the activation zone in the activation bin from the liquid inlet end at the bottom of the activation bin.

2. The rapid decolorization device for dye wastewater based on biochar and persulfate catalysis according to claim 1 is characterized in that: The metal-modified biochar is prepared by the following steps: The waste biomass is pyrolyzed once to obtain biochar particles; Mixing the biochar particles with a metal salt solution for modification to obtain a first biochar mixed solution; The first biochar mixed liquid is dried, and then subjected to secondary pyrolysis and grinding to obtain the metal-modified biochar.

3. The rapid decolorization device for dye wastewater based on biochar and persulfate catalysis according to claim 1 is characterized in that: The adsorption material is non-metal modified biochar, which is prepared by the following steps: The waste biomass is pyrolyzed once to obtain biochar particles; Mixing the biochar particles with a chemical solution for modification to obtain a second biochar mixed solution; The second biochar mixture is dried, and then subjected to secondary pyrolysis and grinding to obtain non-metal modified biochar.

4. The rapid decolorization device for dye wastewater based on biochar and persulfate catalysis according to claim 2 is characterized in that: The metal salt solution is any one or a mixture of several transition metal salts.

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