A system and method for simultaneous hydrogen production by treating chloroform-containing wastewater with Fe-Pd hydroxide

Abstract

The application provides a system for treating chloroform-containing wastewater and simultaneously producing hydrogen by using Fe-Pd hydroxide, comprising a wastewater pool, a water inlet pool, a dosing pool, a reaction pool, a gas valve, an energy storage device, a clean water pool and a plurality of connecting pipelines. The application also provides a method for treating chloroform-containing wastewater and simultaneously producing hydrogen by using Fe-Pd hydroxide. The method adopts Fe-Pd hydroxide to degrade and treat the chloroform-containing wastewater, and removes the chloroform, and at the same time, recycles and utilizes the generated gas methane and hydrogen as fuel resources. The system provided by the application has a simple structure and the method is easy to operate. The system can produce 0.896 L of standard methane and 0.457 L of standard hydrogen per cubic meter of chloroform-containing wastewater, the methane hydrogen participation rate alpha reaches 34%, and the system has fuel utilization feasibility and economy. The system has important significance for environmental pollution control and clean energy development, and has a broad popularization and application prospect.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to a system for treating chloroform-containing wastewater with Fe-Pd hydroxide and simultaneously generating hydrogen, and also relating to a method for treating chloroform-containing wastewater with Fe-Pd hydroxide and simultaneously generating hydrogen. Background Technology

[0002] Chloroform (trichloromethane, CHCl3), as an important organic solvent and synthetic raw material, is widely used in various industries such as coatings, cleaning, pesticides, pharmaceutical synthesis, and daily chemicals. Furthermore, the chlorine disinfection process widely used in water treatment plants generates large amounts of chloromethane-based disinfection byproducts. Meanwhile, chloromethane pollution, represented by chloroform, has become a serious global problem, frequently detected in natural water bodies in various regions. As a toxic chemical reagent, chloroform poses extremely serious harm to human health and the natural environment; therefore, finding an efficient method to degrade chloroform is of significant theoretical and practical value.

[0003] Domestic and foreign scholars have conducted extensive research on the degradation of chloroform. Patent CN201320386111.1 involves heating and condensation, but it still cannot degrade chloroform and recover energy. Patent CN202011254416.8 involves activated carbon adsorption, but activated carbon is easily saturated, producing waste activated carbon (hazardous waste), which causes trouble for subsequent disposal. Patent CN201820240684.6 involves oxidizing chloroform tail gas with ozone to decompose chloroform into substances that are easily absorbed by aqueous solutions, and then using spray absorption to effectively treat trichloromethane tail gas. However, the treatment process consumes oxidants, is prone to secondary pollution, and has high operating costs.

[0004] Some studies have shown that bimetallic systems composed of iron and another catalytic metal can be used for the dechlorination of chlorinated organic compounds. Among them, the Fe-Pd bimetallic system exhibits strong catalytic reductive dechlorination efficiency, with a reaction rate many times higher than that of nano-zero-valent iron, and produces fewer intermediate chlorine-containing products. It possesses many advantages such as high reactivity, simple preparation, and environmental friendliness, and can play a significant role in the reductive dechlorination of chloromethane. However, current Fe-Pd bimetallic systems still have certain limitations. For example, there are currently no commercially available finished nano-iron-palladium bimetallic particles. Highly reducing nanoparticles are easily oxidized, difficult to store, and prone to agglomeration, which greatly increases the particle size and reduces the specific surface area. Furthermore, the nanoparticles are difficult to recover after application, so the loss of nano-metal particles significantly increases costs, which greatly limits its application.

[0005] At the same time, with increasingly severe environmental pollution, the demand for clean energy has become more urgent. Compared with fossil fuels, methane can alleviate energy shortages and reduce environmental pollution, making it a clean alternative energy source. Studies have shown that hydrogen can further improve the combustion efficiency of methane. Compared with pure methane, a mixture of methane and hydrogen has higher combustion efficiency, effectively reducing the generation of harmful pollutants and exhibiting better lean-burn capability.

[0006] Based on this, a novel system and method for degrading chloroform is provided, which avoids the defects and shortcomings of the current Fe-Pd bimetallic system in the application of chloroform degradation, and realizes the simultaneous production of hydrogen and methane during the degradation process, so that chloroform can be utilized as a resource in the form of fuel while being removed. This is a technical problem that researchers urgently need to solve. Summary of the Invention

[0007] One of the objectives of this invention is to provide a system for treating chloroform-containing wastewater and simultaneously generating hydrogen using Fe-Pd hydroxide.

[0008] The second objective of this invention is to provide a method for treating chloroform-containing wastewater and simultaneously generating hydrogen using Fe-Pd hydroxide.

[0009] One of the technical solutions adopted by the present invention to achieve the objective is to provide a system for treating chloroform-containing wastewater and simultaneously producing hydrogen using Fe-Pd hydroxide, comprising: a wastewater tank, an inlet tank, a dosing tank, a reaction tank, a gas valve, an energy storage device, a clear water tank, and several connecting pipelines;

[0010] The wastewater tank is used to store chloroform-containing wastewater; the wastewater tank is connected to the inlet tank through a first pipeline, and the outlet of the inlet tank is connected to the reaction tank through a second pipeline.

[0011] The dosing tank is used to mix ferrous salt aqueous solution, ferrous palladium salt aqueous solution and alkaline solution to obtain Fe-Pd hydroxide mixture; the outlet of the dosing tank is connected to a second pipeline;

[0012] The reaction tank is the site where the Fe-Pd hydroxide mixture reacts with chloroform-containing wastewater. A gas valve is installed at the outlet above the reaction tank, through which the methane and hydrogen produced by the reaction enter the energy storage device. The bottom outlet of the reaction tank is connected to a third pipeline, which is equipped with a three-way valve. The outlet of the three-way valve is connected to a clear water tank and a wastewater tank, respectively.

[0013] The overall concept and invention mechanism of the system for treating chloroform-containing wastewater and simultaneously generating hydrogen using Fe-Pd hydroxide provided by this invention are as follows:

[0014] This invention provides a system for treating chloroform-containing wastewater and simultaneously generating hydrogen using Fe-Pd hydroxide to address chloromethane pollution in industrial wastewater. This system effectively removes chloroform from the wastewater while using the treated products and byproducts as fuel. In the dosing tank of this invention, Pd... 2+ As a catalyst, through interaction with Fe 2+ The Fe-Pd hydroxides combine to form Fe-Pd hydroxides. Then, in a reaction tank, the Fe-Pd hydroxide mixture is mixed with chloroform-containing wastewater. The dechlorination and reduction of chloroform is a result of the combined action of the Fe-Pd hydroxides. Active hydrogen (H·) is present in the Fe-Pd hydroxide reaction system, and H· is a crucial participant in the chloroform dechlorination reaction and the source of hydrogen production. When H· is sufficient, chloroform can be directly reduced to methane by H·; when H· is insufficient, chloroform is reduced to dichloromethane by H·; when H· is scarce, chloroform is reduced to the CH2Cl2· active group, ultimately reacting to become dichloromethane. Fe-Pd hydroxides exhibit excellent reductive dechlorination and hydrogen production efficiency for chloroform. Upon completion of the reaction, chloroform is completely converted into a trace amount of the dechlorination intermediate product dichloromethane and the fully dechlorinated product methane, with a final methane yield exceeding 80%.

[0015] Furthermore, the first pipeline is equipped with a water pump; the water pump pumps the chloroform-containing wastewater in the wastewater pool to the inlet pool.

[0016] Furthermore, the second pipeline is equipped with a check valve to prevent the liquid in the reaction tank from flowing back into the inlet water tank.

[0017] Furthermore, both the dosing tank and the reaction tank are equipped with a stirring device. Preferably, the stirring device is an electric stirrer.

[0018] Furthermore, the third pipeline is equipped with a filter, a check valve, and a water quality detector. The reacted water in the reaction tank enters the third pipeline. The filter in the third pipeline is used to intercept Fe-Pd hydroxide. The reacted water flows downwards by gravity through the check valve. The water quality detector installed before the clear water tank is used to detect the water quality of the reacted water in the third pipeline. If the water quality meets the standard, the three-way valve opens to the clear water tank; if the water quality does not meet the standard, the three-way valve opens to the wastewater tank for circulation treatment.

[0019] Furthermore, the energy storage device is a hydrogen fuel cell. The methane and hydrogen produced in the reaction tank are stored together in the hydrogen production cylinder of the hydrogen fuel cell and converted into electrical energy through the hydrogen fuel cell device.

[0020] Preferably, the hydrogen fuel cell is used to power one or more electrical devices in the system. The electrical devices include one or more combinations of a water pump, a stirring device, and a water quality detector.

[0021] In some preferred embodiments, the system provided by the present invention is used to treat chloroform-containing wastewater. Based on the conversion between the wastewater volume and its hydrogen production concentration, it is found that treating chloroform-containing wastewater with a concentration of 50 μmol / L per cubic meter can produce 0.896 L of standard-condition methane and 0.457 L of standard-condition hydrogen, with a product fuel hydrogen content α = 34%.

[0022] The second objective of this invention is achieved by providing a method for treating chloroform-containing wastewater and simultaneously generating hydrogen using Fe-Pd hydroxide, comprising the following steps:

[0023] S1. Chloroform-containing wastewater in the wastewater tank enters the inlet tank through a water pump and the first pipeline, and then enters the reaction tank through the second pipeline.

[0024] S2. In the dosing tank, ferrous salt aqueous solution, palladium salt aqueous solution and alkaline solution are mixed to obtain Fe-Pd hydroxide mixture; Fe-Pd hydroxide mixture enters the reaction tank through the second pipeline;

[0025] S3. In the reaction tank, the Fe-Pd hydroxide mixture reacts with chloroform-containing wastewater, and the methane and hydrogen produced by the reaction enter the energy storage device through the gas valve.

[0026] S4. Test the wastewater after the reaction. Wastewater that meets the standards will enter the clear water tank, while wastewater that does not meet the standards will enter the wastewater tank for recycling.

[0027] Furthermore, both the dosing tank in step S2 and the reaction tank in step S3 are anaerobic environments. Anaerobic conditions ensure that Fe... 2+ It is not oxidized, thus maintaining its reducing activity to provide electrons to generate active hydrogen, thereby achieving the reduction and degradation of organic matter.

[0028] Further, in step S2, the ferrous salt is selected from ferric chloride, the palladium salt is selected from palladium chloride, and the alkaline solution is selected from an aqueous sodium hydroxide solution. Preferably, the concentration of the aqueous sodium hydroxide solution is 0.5–2 mol / L.

[0029] Furthermore, in steps S2 and S3, although the energy recovery potential is strongest when the pH of the Fe-Pd hydroxide mixture is high, the high pH also leads to the generation of the byproduct dichloromethane, affecting the wastewater treatment effect. Therefore, in practical applications, the relationship between energy recovery and treatment effect should be carefully controlled, prioritizing treatment effect before maximizing energy recovery efficiency. Preferably, the pH value of the Fe-Pd hydroxide mixture is 7-8, and in the Fe-Pd hydroxide mixture, Fe... 2+ With Pd 2+ The molar ratio is 5 to 100:1.

[0030] Preferably, in the Fe-Pd hydroxide mixture, Fe2+ The concentration of Fe is not less than 5 mmol / L. In this invention, Fe 2+ Iron is the only electron donor in the reaction system. Sufficient iron, under Pd catalyst and slightly alkaline conditions (pH ≥ 7.5), can generate enough H· to ensure the complete degradation of chloroform and the production of the target products hydrogen and methane. Preferably, Fe... 2+ With Pd 2+ The molar ratio is 10–30:1. More preferably, when Fe 2+ The concentration was 5 mmol / L, and Fe 2+ With Pd 2+ When the molar ratio is 12.5:1 or 25:1, Fe 2+ With Pd 2+ They can better exert the best synergistic effect. After 110 min of reaction, the conversion rate of chloroform to methane exceeded 60%, showing good chloroform degradation effect and high methane conversion rate.

[0031] Preferably, the aqueous solutions of ferrous salt and palladium salt are prepared using oxygen-free ultrapure water (UP water).

[0032] Furthermore, in step S3, the reaction time between the Fe-Pd hydroxide mixture and the chloroform-containing wastewater is 0.5 to 5 hours, preferably 1 to 2 hours.

[0033] Furthermore, research has revealed that in the system of this invention, SiO3... 2- and PO4 3- The presence of calcium salt has an overwhelming inhibitory effect on the chloroform degradation reaction; a concentration of only 1 mM is sufficient to completely prevent the methanogenesis and hydrogen production reactions in this system. Therefore, preferably, the chloroform-containing wastewater is pretreated by chemical precipitation of SiO3 through the addition of calcium salts. 2- and PO4 3- The removal of.

[0034] In addition, HA, CO3 2- and SO4 2- The inhibitory effect on the degradation of methanogenesis is relatively mild, and it promotes hydrogen production to varying degrees. Specifically, the promoting effect on CO3... 2- >HA>SO4 2- Therefore, preferably, an appropriate amount of CO3 can be added to the reaction system. 2- To improve treatment effectiveness.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] (1) The system for treating chloroform-containing wastewater and generating hydrogen simultaneously using Fe-Pd hydroxide provided by the present invention uses Fe-Pd hydroxide to degrade chloroform-containing wastewater, removes chloroform, and recovers and utilizes the gaseous methane and hydrogen generated by the reaction as fuel resources. It is of great significance for environmental pollution control and clean energy development, and has the potential for promotion and application.

[0037] (2) The method for treating chloroform-containing wastewater and simultaneously producing hydrogen using Fe-Pd hydroxide provided by this invention uses chloroform as the target pollutant and employs Fe-Pd hydroxide to reduce and dechlorinate chloroform to produce hydrogen. Calculations show that this invention can produce 0.896 L of standard-condition methane and 0.457 L of standard-condition hydrogen per cubic meter of chloroform wastewater, with a methane hydrogen content α reaching 34%, demonstrating feasibility and economic viability for fuel utilization. Attached Figure Description

[0038] Figure 1 A schematic diagram of a system for treating chloroform-containing wastewater and simultaneously generating hydrogen using Fe-Pd hydroxide, provided in an embodiment of the present invention;

[0039] Figure 2 A schematic flowchart of a method for treating chloroform-containing wastewater and simultaneously generating hydrogen using Fe-Pd hydroxide, provided as an embodiment of the present invention;

[0040] Figure 3 Different Fe values ​​were used in Examples 1-6 of this invention. 2+ / Pd 2+ Comparison of the effects of the prepared Fe-Pd hydroxide mixture on chloroform degradation and methane yield;

[0041] Figure 4 The degradation effects of chloroform on comparative examples 1 and 2 are shown in the graphs.

[0042] Among them, 1-wastewater tank; 11-first pipeline; 2-inlet tank; 21-second pipeline; 3-dosing tank; 4-reaction tank; 41-third pipeline; 42-triple valve; 5-gas valve; 6-energy storage device; 7-clear water tank. Detailed Implementation

[0043] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0045] Please see Figure 1 The present invention provides a system for treating chloroform-containing wastewater and simultaneously producing hydrogen using Fe-Pd hydroxide, comprising: a wastewater tank 1, an inlet tank 2, a dosing tank 3, a reaction tank 4, a gas valve 5, an energy storage device 6, a clear water tank 7, and several connecting pipelines.

[0046] The wastewater tank 1 (15cm×15cm×15cm) is used to store chloroform-containing wastewater; the wastewater tank 1 is connected to the inlet tank 2 through the first pipe 11, and the outlet of the inlet tank 2 is connected to the reaction tank 4 through the second pipe 21, which is equipped with a check valve; the first pipe 11 is equipped with a water pump (power 4W, flow rate 280L / h, head 0.75m, connected to a 13mm diameter hose), and the flow velocity of the wastewater entering the inlet tank 2 is about 0.3m / s. After the flow velocity is adjusted by the inlet tank, the flow velocity of the wastewater is reduced to 0.15m / s.

[0047] The dosing tank 3 (5cm in diameter and 10cm in height) is an oxygen-free environment and is equipped with an electric stirring device. The dosing tank 3 is used to mix ferrous salt aqueous solution, ferrous palladium salt aqueous solution and alkaline solution to obtain Fe-Pd hydroxide mixture. The outlet of the dosing tank 3 is connected to the second pipeline 21.

[0048] The reaction tank 4 (15cm in diameter, 20cm in height) is an anaerobic environment. Reaction tank 4 is the site for the reduction and dechlorination reaction between the Fe-Pd hydroxide mixture and chloroform-containing wastewater. The chloroform-containing wastewater is continuously introduced as the reaction proceeds and discharged intermittently, based on the effective volume of wastewater in the reaction tank (approximately 0.002m³). 3 The flow rate of wastewater treated per unit time is set by conditions such as the speed of the electric stirrer. In this embodiment of the invention, the wastewater treatment rate per unit time is approximately 0.00034 L / s. An electric stirring device is installed in the reaction tank 4, and a gas valve 5 is installed at the outlet above the reaction tank 4. The methane and hydrogen produced by the reaction enter the hydrogen production cylinder of the hydrogen fuel cell in the energy storage device 6 through the gas valve 5. Whether hydrogen is produced and the actual conversion result of fuel energy can be visually observed through the ammeter pointer and the rotation of the electric fan. The hydrogen fuel cell is used to power one or more electrical devices in the system (including water pumps, electric stirrers, etc.).

[0049] The bottom outlet of reaction tank 4 is connected to a third pipeline 41. The third pipeline 41 is equipped with a three-way valve 42, the outlet of which is connected to a clear water tank 7 and a wastewater tank 1. The third pipeline 41 is also equipped with a filter, a check valve, and a water quality detector. The filter intercepts Fe-Pd hydroxide in the third pipeline 41. The reacted water flows downwards by gravity through the check valve. The water quality detector, located before the clear water tank 7, monitors the quality of the reacted water in the third pipeline. If the water quality meets the standards, the three-way valve 42 opens to the clear water tank 7; if the water quality does not meet the standards, the three-way valve 42 opens to the wastewater tank 1 for recycling.

[0050] The present invention will be further described below with reference to specific embodiments, but these are not intended to limit the scope of the invention.

[0051] Example 1

[0052] This embodiment provides a method for treating chloroform-containing wastewater and simultaneously generating hydrogen using Fe-Pd hydroxide, as shown in the schematic diagram below. Figure 2 As shown, it includes the following steps:

[0053] Step 1: The chloroform-containing wastewater (chloroform concentration of 50 μmol / L) in wastewater tank 1 enters the inlet tank 12 through the water pump and the first pipeline 11, and then enters the reaction tank 4 through the second pipeline 21;

[0054] Step 2: In dosing tank 3, ferric chloride solution and palladium chloride solution are mixed, and then sodium hydroxide aqueous solution is added to adjust the pH to obtain a Fe-Pd hydroxide mixture with pH = 7.5; wherein, Fe 2+ The concentration is 5 mmol / L, Fe 2+ With Pd 2+ The molar ratio is 8.33:1; the Fe-Pd hydroxide mixture enters the reaction tank 4 through the second pipeline 21;

[0055] Step 3: In reaction tank 4, Fe-Pd hydroxide mixture reacts with chloroform-containing wastewater, and the methane and hydrogen produced by the reaction enter the energy storage device 6 hydrogen fuel cell through gas valve 5.

[0056] Step 4: Test the wastewater after the reaction. Wastewater that meets the standards will enter the clear water tank, while wastewater that does not meet the standards will enter wastewater tank 1 for recycling.

[0057] Example 2

[0058] The difference between this embodiment and Example 1 is that in the Fe-Pd hydroxide mixture obtained in step 2, Fe... 2+ With Pd 2 + The molar ratio is 12.5:1, and other operating steps and conditions remain unchanged.

[0059] Example 3

[0060] The difference between this embodiment and Example 1 is that in the Fe-Pd hydroxide mixture obtained in step 2, Fe... 2+ With Pd 2 + The molar ratio is 25:1, and other operating steps and conditions remain unchanged.

[0061] Example 4

[0062] The difference between this embodiment and Example 1 is that in the Fe-Pd hydroxide mixture obtained in step 2, Fe... 2+ With Pd 2 + The molar ratio is 31.25:1, and other operating steps and conditions remain unchanged.

[0063] Example 5

[0064] The difference between this embodiment and Example 1 is that in the Fe-Pd hydroxide mixture obtained in step 2, Fe... 2+ With Pd 2 + The molar ratio is 50:1, and other operating steps and conditions remain unchanged.

[0065] Example 6

[0066] The difference between this embodiment and Example 1 is that in the Fe-Pd hydroxide mixture obtained in step 2, Fe... 2+ With Pd 2 + The molar ratio is 100:1, and other operating steps and conditions remain unchanged.

[0067] Figure 3 Different Fe values ​​were used in Examples 1-6 of this invention. 2+ With Pd 2+ The effect of Fe-Pd hydroxide mixture prepared at a certain molar ratio on the degradation effect of chloroform and the methane yield is shown in the figure.

[0068] Depend on Figure 3 It can be seen that Fe in Example 2 2+ / Pd 2+ =12.5:1 and Fe in Example 3 2+ / Pd 2+ When the ratio was 25:1, the conversion rate of chloroform to methane exceeded 60% after 110 minutes of reaction. Compared with other examples, Examples 2 and 3 not only showed better chloroform degradation but also higher methane conversion rates. According to theoretical calculations, Example 2 can produce 0.896 L of standard-condition methane and 0.457 L of standard-condition hydrogen per cubic meter of chloroform wastewater, with a methane hydrogen content of 34%, demonstrating its application value.

[0069] Comparative Example 1

[0070] The difference between this comparative example and Example 1 is that in step 2, only a Fe hydroxide solution is prepared, and Fe... 2+ The concentration was 5 mmol / L, and other operating procedures and conditions remained unchanged.

[0071] Comparative Example 2

[0072] The difference between this comparative example and Example 1 is that in step 2, only a Pd hydroxide solution is prepared, and Pd... 2+ The concentration was 5 mmol / L, and other operating procedures and conditions remained unchanged.

[0073] Under the same experimental conditions as in Example 1, the degradation effects of chloroform and methane yield of Comparative Examples 1 and 2 were tested as follows: Figure 4 As shown.

[0074] Depend on Figure 4 It is understood that in this invention, the dechlorination reduction of chloroform is the result of the combined action of Fe-Pd hydroxides. Neither Fe(OH)2 nor Pd(OH)2 alone can achieve the same reaction effect as the coprecipitated Fe-Pd hydroxide system.

[0075] In summary, this invention provides a system and method for treating chloroform-containing wastewater and simultaneously generating hydrogen using Fe-Pd hydroxide. This novel bimetallic system, Fe-Pd hydroxide, efficiently reduces and dechlorinates the wastewater, producing environmentally friendly clean energy—methane and hydrogen. The device is then self-driven and sustainably operated via a hydrogen fuel cell. This system and method can not only be applied to the treatment of chloromethane pollutants in industrial wastewater, but the resulting gaseous products can also be utilized as clean energy resources, demonstrating broad prospects for promotion and application.

[0076] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the content of this specification should be included within the protection scope of the present invention.

Claims

1. A method for treating chloroform-containing wastewater and simultaneously generating hydrogen using Fe-Pd hydroxide, characterized in that, Includes the following steps: S1. The chloroform-containing wastewater in the wastewater tank (1) enters the inlet tank (2) through the water pump and the first pipeline (11), and then enters the reaction tank (4) through the second pipeline (21). S2. In the dosing tank (3), the aqueous solutions of ferrous salt and palladium salt are mixed, and then alkali solution is added to adjust the pH value to obtain a Fe-Pd hydroxide mixture with a pH value of 7-8; the Fe-Pd hydroxide mixture enters the reaction tank (4) through the second pipeline (21); in the Fe-Pd hydroxide mixture, Fe 2+ The concentration of Fe is not less than 5 mmol / L. 2+ With Pd 2+ The molar ratio is 12.5~25:1; S3. In the reaction tank (4), the Fe-Pd hydroxide mixture reacts with chloroform-containing wastewater, and the methane and hydrogen produced by the reaction enter the energy storage device (6) through the gas valve (5). S4. Test the wastewater after the reaction. Wastewater that meets the standard will enter the clear water tank, and wastewater that does not meet the standard will enter the wastewater tank (1) for recycling. Both the dosing tank (3) in step S2 and the reaction tank (4) in step S3 are anaerobic environments.

2. The method according to claim 1, characterized in that, In step S2, the divalent palladium salt is selected from palladium chloride, and the alkaline solution is selected from sodium hydroxide aqueous solution.

3. The method according to claim 1, characterized in that, In step S3, the reaction time between the Fe-Pd hydroxide mixture and the chloroform-containing wastewater is 0.5~5h.

4. The method according to claim 1, characterized in that, The method is implemented using a system that utilizes Fe-Pd hydroxide to treat chloroform-containing wastewater and simultaneously generate hydrogen. The system includes: a wastewater tank (1), an inlet tank (2), a dosing tank (3), a reaction tank (4), a gas valve (5), an energy storage device (6), a clear water tank (7), and several connecting pipelines; The wastewater tank (1) is used to store chloroform-containing wastewater; the wastewater tank (1) is connected to the inlet tank (2) through the first pipeline (11), and the outlet of the inlet tank (2) is connected to the reaction tank (4) through the second pipeline (21); The dosing tank (3) is used to mix the divalent iron salt aqueous solution and the divalent palladium salt aqueous solution, and then add alkali solution to adjust the pH value to obtain a Fe-Pd hydroxide mixture with a pH value of 7~8; the outlet of the dosing tank (3) is connected to the second pipeline (21). The reaction tank (4) is the place where Fe-Pd hydroxide mixture reacts with chloroform-containing wastewater. A gas valve (5) is provided at the upper outlet of the reaction tank (4). The methane and hydrogen produced by the reaction enter the energy storage device (6) through the gas valve (5). The bottom outlet of the reaction tank (4) is connected to the third pipeline (41). The third pipeline (41) is equipped with a three-turn valve (42). The outlet of the three-turn valve (42) is connected to the clear water tank (7) and the wastewater tank (1) respectively.

5. The method according to claim 4, characterized in that, The first pipeline (11) is equipped with a water pump; the second pipeline (21) is equipped with a check valve.

6. The method according to claim 4, characterized in that, Both the dosing tank (3) and the reaction tank (4) are equipped with stirring devices.

7. The method according to claim 4, characterized in that, The third pipeline (41) is equipped with a filter, a check valve and a water quality detector.

8. The method according to claim 4, characterized in that, The energy storage device (6) is a hydrogen fuel cell; the hydrogen fuel cell is used to supply power to one or more electrical devices in the system.

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