Aging failure biochar-based alginate composite carrier material activation recycling method and system

Abstract

This invention discloses a method and system for activating and regenerating aged and degraded biochar-based alginate composite carrier materials, comprising the following steps: screening the aged and degraded biochar-based alginate composite carrier material to obtain intermediate substance 1; washing and swelling the intermediate substance 1, and purifying it to obtain intermediate substance 2; adding the intermediate substance 2 to an acid solution, stirring and reacting, and then purifying it to obtain intermediate substance 3; mixing the intermediate substance 3 with a sodium alginate solution, and reacting it ultrasonically to obtain intermediate substance 4; adding the intermediate substance 4 to a calcium chloride solution for cross-linking and solidification to obtain intermediate substance 5; collecting and purifying the intermediate substance 5 to obtain the product. This invention features a simple process, economical and easily controllable conditions, and can achieve the activation and regeneration of aged and degraded biochar-based alginate composite carrier materials under mild conditions, reducing disposal costs and effectively avoiding potential environmental pollution from aged and degraded carrier materials.

Description

Technical Field

[0001] This invention belongs to the field of ecological environment restoration and environmental functional materials technology, specifically relating to a method and system for activating and regenerating aging and deteriorating biochar-based alginate composite carrier materials. Background Technology

[0002] There are various methods for ecological remediation of pollution, among which microbial remediation technology is favored due to its advantages such as low cost, good effect, and less secondary pollution. Conventional microbial remediation technology is easily affected by various inhibitory factors during implementation, resulting in low efficiency. In engineering technology, methods such as adding functional carriers are generally used to enhance its effectiveness.

[0003] Biochar-based alginate composite carrier materials are formed by cross-linking and solidifying a biochar matrix, alginate, probiotics, and nutrients into granular materials, mostly regular-sized solid microspheres. They are widely used in wastewater treatment and aquatic environmental microbial remediation. They can enhance the degradation efficiency of indigenous or engineered microorganisms through various mechanisms such as nutrient supply, environmental factor regulation, microbial habitat improvement, and increased redox rates, thereby improving the efficiency and effectiveness of microbial remediation. Their preservation generally requires low to medium temperature and constant temperature and humidity conditions. In actual engineering implementation, they are often added in excess of the required amount at one time, requiring excessive preparation and procurement. Limited storage conditions under site conditions inevitably lead to excessive water loss, aging, breakage, and failure, hindering their ability to improve efficiency and effectiveness. There have been reports of biochar-based alginate composite carrier materials aging, failing, and being discarded.

[0004] Biochar-based alginate composite carrier materials have wide applications in ecological restoration, resulting in large consumption volumes and increasing potential environmental impacts after aging and failure. Currently, partially or completely aged biochar-based alginate composite carrier materials are often repurposed (e.g., as plant growth soil fillers) or disposed of as waste through stockpiling or landfilling. This not only occupies significant physical space but also poses a risk of leaching of substances fixed within the composite carrier material, often leading to secondary potential environmental pollution and hazards. Therefore, how to reduce functional failure and potential environmental pollution caused by aging and failure, revitalize and utilize the failed materials, and regenerate potential waste into resources has become an urgent problem to be solved. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a method and system for the activation and regeneration of aged and degraded biochar-based alginate composite carrier materials. The method for activating and regenerating aged and degraded biochar-based alginate composite carrier materials provided by the present invention promotes the swelling, pore-forming, and re-crosslinking solidification of aged and degraded composite carrier particles through multiple steps including sieving, swelling, acid leaching, mixing, solidification, and collection, thereby achieving activation and regeneration. Furthermore, the present invention provides a system for the activation and regeneration of aged and degraded biochar-based alginate composite carrier materials, including a sieving module, a swelling module, an acid leaching module, a mixing module, a solidification module, and a collection module, for implementing the above method.

[0006] This invention discloses a method for activating and regenerating aged and deteriorated biochar-based alginate composite carrier materials, which includes the following steps:

[0007] S1. The aged and failed biochar-based alginate composite carrier material was screened to obtain intermediate substance 1;

[0008] S2. The intermediate substance 1 is washed, swollen, and purified to obtain intermediate substance 2;

[0009] S3. The intermediate substance 2 is added to an acid solution, stirred and reacted, and then purified to obtain intermediate substance 3;

[0010] S4. Mix the intermediate substance 3 with sodium alginate solution and react with ultrasound to obtain intermediate substance 4;

[0011] S5. The intermediate substance 4 is added to a calcium chloride solution for cross-linking and curing to obtain intermediate substance 5;

[0012] S6. Collect and purify the intermediate substance 5 to obtain the product;

[0013] The composition of the aged and deteriorated biochar-based alginate composite carrier material includes 0.5-5 wt% biochar powder and 5-10 wt% alginate.

[0014] Furthermore, the aged and degraded biochar-based alginate composite carrier material has a multi-layered network structure and homogeneous microspheres. Its main components include biochar powder and its adsorbed and solidified components, alginate, and Ca. 2+ The composition includes 0.5–5 wt% biochar powder, 5–10 wt% alginate, and the remainder consisting of adsorbent carriers and water.

[0015] Furthermore, the aged and degraded biochar-based alginate composite carrier material also includes an adsorbent, a solidified substrate, and Ca. 2+ Water.

[0016] Furthermore, the particle size of the intermediate substance 1 obtained by sieving is 3-5 mm.

[0017] Further, the swelling is achieved by adding the intermediate substance 1 to a hydrogen peroxide solution for washing and swelling.

[0018] Furthermore, the concentration of the hydrogen peroxide solution is 5–30 wt%; the cleaning and swelling time is 1–6 h.

[0019] Preferably, the concentration of the hydrogen peroxide solution is 10 wt%, and the cleaning and swelling time is 2 hours.

[0020] Furthermore, the acid is selected from one or more of phosphoric acid, citric acid, nitric acid, and hydrochloric acid.

[0021] Further, the acid comprises phosphoric acid at a concentration of 0.5–15 wt% and citric acid at a concentration of 1.0–10 wt%.

[0022] Furthermore, the stirring reaction time is 2 to 12 hours, and the stirring speed is 15 to 100 rpm.

[0023] Furthermore, the concentration of the sodium alginate solution is 0.5–3.0 wt%.

[0024] Preferably, the sodium alginate solution has a concentration of 2.0 wt%.

[0025] Furthermore, the concentration of the calcium chloride solution is 0.5–3.0 wt%.

[0026] Figure 1 The present invention illustrates the steps of a method for activating and regenerating aged and deteriorated biochar-based alginate composite carrier material.

[0027] The present invention also discloses an activation and regeneration system for aged and deteriorated biochar-based alginate composite carrier materials, which includes a sieving module, a swelling module, an acid leaching module, a mixing module, a solidification module and a collection module;

[0028] The screening module is used to screen the aged and failed biochar-based alginate composite carrier material to obtain intermediate substance 1.

[0029] The swelling module is used to wash and swell the intermediate substance 1, and purify it to obtain the intermediate substance 2.

[0030] The acid leaching module is used to add the intermediate substance 2 to an acid solution, stir and react, and then purify to obtain the intermediate substance 3.

[0031] The mixing module is used to mix the intermediate substance 3 with sodium alginate solution and react with ultrasound to obtain intermediate substance 4;

[0032] The curing module is used to add the intermediate substance 4 to a calcium chloride solution for cross-linking and curing to obtain the intermediate substance 5;

[0033] The collection module is used to collect and purify the intermediate substance 5.

[0034] Figure 2 A structural diagram of an activation and regeneration system for aged and deteriorated biochar-based alginate composite carrier materials is shown.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. This invention first uses hydrogen peroxide solution to clean and swell the aged and failed composite carrier material. An appropriate amount of hydrogen peroxide solution releases oxygen and generates microbubbles during oxidation, promoting the swelling and unfolding of the multi-layered network structure to achieve structural self-repair. Simultaneously, it exposes the organic and inorganic contaminants adhering to the inner layer, allowing for better oxidation and removal. Then, an appropriate amount of a mixed solution of phosphoric acid and citric acid is added for acid leaching, cleaning the exposed inorganic contaminants in the inner layer. This also has the effects of melting and creating pores and modifying with biochar, effectively promoting the activation and regeneration of biochar. Thus, the synergistic effect enhances the porosity and adsorption performance of the composite carrier material.

[0037] 2. This invention effectively utilizes aged and degraded biochar-based alginate composite carrier materials. Through steps such as sieving, swelling, acid leaching, mixing, curing, and collection, it promotes re-crosslinking and curing, achieving functional activation and material regeneration. The implementation process is simple, the conditions are economical and easy to control, and it can efficiently revitalize and regenerate aged and degraded biochar-based alginate composite carrier materials under mild conditions, reducing disposal costs and effectively lowering potential pollution risks, thus having significant economic and social benefits. Attached Figure Description

[0038] Figure 1 The present invention illustrates the steps of a method for activating and regenerating aged and deteriorated biochar-based alginate composite carrier material.

[0039] Figure 2 A structural diagram of an activation and regeneration system for aged and deteriorated biochar-based alginate composite carrier materials is shown.

[0040] Figure 3 (a) shows the appearance of the aged and failed biochar-based alginate composite carrier material after activation and regeneration in Example 1; Figure 3 (b) shows the appearance morphology of a common biochar-based alginate composite carrier material. Detailed Implementation

[0041] To more clearly illustrate the technical solution of the present invention, the following embodiments are provided. Unless otherwise stated, the raw materials, reactions, and post-processing methods appearing in the embodiments are all commercially available raw materials and technical methods well known to those skilled in the art.

[0042] The aged and deteriorated biochar-based alginate composite material in this embodiment of the invention was taken from a material storage warehouse at a water environment remediation project site. It is a commercially available product, stored for more than 8 months, and appears as microspheres, many of which are damaged or cracked. The composition of the aged and deteriorated biochar-based alginate composite carrier material includes 0.5-5 wt% biochar powder and 5-10 wt% alginate.

[0043] Example 1

[0044] A method for activating and regenerating aged and degraded biochar-based alginate composite carrier material includes the following steps:

[0045] S1. Add the aged and deteriorated biochar-based alginate composite carrier material to a linear vibrating screen, set up a 3-layer grading screen, collect the complete composite carrier material particles with a particle size of 3-5 mm with minimal damage, and obtain intermediate substance 1;

[0046] S2. The intermediate substance 1 is added to a 10wt% hydrogen peroxide solution at a solid-liquid ratio of 200g / L, and stirred at 50rpm for 2h to swell. After removing floating matter and precipitate, the composite carrier material suspended in the solution is collected, and the water is drained using a vibration draining device to keep the material moist, thus obtaining intermediate substance 2.

[0047] S3. The intermediate substance 2 was added to a mixed solution of 10.0 wt% phosphoric acid solution and 5.0 wt% citric acid solution at a solid-liquid ratio of 400 g / L (the volume ratio of phosphoric acid solution to citric acid solution is 5:1). The mixture was stirred at 30 rpm and reacted for 4 h. After washing, the intermediate substance 3 was obtained.

[0048] S4. The intermediate substance 3 was added to a 2.0wt% sodium alginate solution at a solid-liquid ratio of 400g / L, and the mixture was ultrasonically reacted for 0.5h. The solid microspheres were collected, and the attached residue was removed by a vibration draining device to obtain the intermediate substance 4.

[0049] S5. The intermediate substance 4 was added to a 2.0 wt% calcium chloride solution at a solid-liquid ratio of 400 g / L for cross-linking and curing for 4 h to obtain intermediate substance 5;

[0050] S6. Collect the intermediate substance 5, wash it until neutral, and freeze-dry it under vacuum for 12 hours to obtain the final product.

[0051] Figure 3(a) shows the appearance of the aged and failed biochar-based alginate composite carrier material after activation and regeneration in Example 1; Figure 3 (b) shows the appearance morphology of a common biochar-based alginate composite carrier material.

[0052] Example 2

[0053] S1. Add the aged and deteriorated biochar-based alginate composite carrier material to a linear vibrating screen, set up a 3-layer grading screen, collect the complete composite carrier material particles with a particle size of 3-5 mm with minimal damage, and obtain intermediate substance 1;

[0054] S2. The intermediate substance 1 is added to a 5wt% hydrogen peroxide solution at a solid-liquid ratio of 150g / L. The mixture is stirred at 100rpm for 6h to clean and swell, remove floating matter and precipitate, collect the composite carrier material that is suspended in the solution, drain the water using a vibration draining device, keep the material moist, and obtain the intermediate substance 2.

[0055] S3. The intermediate substance 2 was added to a mixed solution of 10.0 wt% phosphoric acid solution and 5.0 wt% citric acid solution at a solid-liquid ratio of 400 g / L (the volume ratio of phosphoric acid solution to citric acid solution is 5:1). The mixture was stirred at 30 rpm and reacted for 4 h. After washing, the intermediate substance 3 was obtained.

[0056] S4. The intermediate substance 3 was added to a 2.0wt% sodium alginate solution at a solid-liquid ratio of 400g / L, and the mixture was ultrasonically reacted for 0.5h. The solid microspheres were collected, and the attached residue was removed by a vibration draining device to obtain the intermediate substance 4.

[0057] S5. The intermediate substance 4 was added to a 2.0 wt% calcium chloride solution at a solid-liquid ratio of 400 g / L for cross-linking and curing for 4 h to obtain intermediate substance 5;

[0058] S6. Collect the intermediate substance 5, wash it until neutral, and freeze-dry it under vacuum for 12 hours to obtain the final product.

[0059] Example 3

[0060] S1. Add the aged and deteriorated biochar-based alginate composite carrier material to a linear vibrating screen, set up a 3-layer grading screen, collect the complete composite carrier material particles with a particle size of 3-5 mm with minimal damage, and obtain intermediate substance 1;

[0061] S2. The intermediate substance 1 is added to a 10wt% hydrogen peroxide solution at a solid-liquid ratio of 200g / L. The mixture is stirred at 50rpm for 2h to clean and swell, remove floating matter and precipitate, collect the composite carrier material that is suspended in the solution, drain the water using a vibration draining device, keep the material moist, and obtain the intermediate substance 2.

[0062] S3. The intermediate substance 2 was added to a mixed solution of 5.0 wt% phosphoric acid solution and 2.0 wt% citric acid solution at a solid-liquid ratio of 300 g / L (the volume ratio of phosphoric acid solution to citric acid solution was 20:3). The mixture was stirred at 50 rpm and reacted for 8 hours. After washing, the intermediate substance 3 was obtained.

[0063] S4. The intermediate substance 3 is added to a 2.0wt% sodium alginate solution at a solid-liquid ratio of 400g / L, and the mixture is ultrasonically reacted for 1h. The solid microspheres are collected, and the attached residue is removed by a vibrating draining device to obtain the intermediate substance 4.

[0064] S5. The intermediate substance 4 was added to a 2.0 wt% calcium chloride solution at a solid-liquid ratio of 400 g / L for cross-linking and curing for 4 h to obtain intermediate substance 5;

[0065] S6. Collect the intermediate substance 5, wash it until neutral, and freeze-dry it under vacuum for 12 hours to obtain the final product.

[0066] Example 4

[0067] A method for activating and regenerating aged and degraded biochar-based alginate composite carrier material includes the following steps:

[0068] S1. Add the aged and deteriorated biochar-based alginate composite carrier material to a linear vibrating screen, set up a 3-layer grading screen, collect the complete composite carrier material particles with a particle size of 3-5 mm with minimal damage, and obtain intermediate substance 1;

[0069] S2. The intermediate substance 1 is added to a 10wt% hydrogen peroxide solution at a solid-liquid ratio of 200g / L. The mixture is stirred at 50rpm for 2h to clean and swell, remove floating matter and precipitate, collect the composite carrier material that is suspended in the solution, drain the water using a vibration draining device, keep the material moist, and obtain the intermediate substance 2.

[0070] S3. The intermediate substance 2 was added to a mixed solution of 10.0 wt% phosphoric acid solution and 5.0 wt% citric acid solution at a solid-liquid ratio of 400 g / L (the volume ratio of phosphoric acid solution to citric acid solution is 5:1). The mixture was stirred at 30 rpm and reacted for 4 h. After washing, the intermediate substance 3 was obtained.

[0071] S4. The intermediate substance 3 is added to a 1.0wt% sodium alginate solution at a solid-liquid ratio of 200g / L, and the reaction is carried out by sonication for 0.5h. The solid microspheres are collected, and the attached residue is removed by a vibration draining device to obtain the intermediate substance 4.

[0072] S5. The intermediate substance 4 was added to a 1.0 wt% calcium chloride solution at a solid-liquid ratio of 300 g / L and crosslinked and cured for 8 h to obtain intermediate substance 5;

[0073] S6. Collect the intermediate substance 5, wash it until neutral, and freeze-dry it under vacuum for 12 hours to obtain the final product.

[0074] Example 5

[0075] A method for activating and regenerating aged and degraded biochar-based alginate composite carrier material includes the following steps:

[0076] S1. Add the aged and deteriorated biochar-based alginate composite carrier material to a linear vibrating screen, set up a 3-layer grading screen, collect the complete composite carrier material particles with a particle size of 3-5 mm with minimal damage, and obtain intermediate substance 1;

[0077] S2. The intermediate substance 1 is added to a 10wt% hydrogen peroxide solution at a solid-liquid ratio of 200g / L. The mixture is stirred at 50rpm for 2h to clean and swell, remove floating matter and precipitate, collect the composite carrier material that is suspended in the solution, drain the water using a vibration draining device, keep the material moist, and obtain the intermediate substance 2.

[0078] S3. The intermediate substance 2 was added to a mixed solution of 10.0 wt% phosphoric acid solution and 5.0 wt% citric acid solution at a solid-liquid ratio of 400 g / L (the volume ratio of phosphoric acid solution to citric acid solution is 5:1). The mixture was stirred at 50 rpm and reacted for 4 h. After washing, the intermediate substance 3 was obtained.

[0079] S4. The intermediate substance 3 was added to a 3.0wt% sodium alginate solution at a solid-liquid ratio of 400g / L, and the reaction was carried out by sonication for 0.5h. The solid microspheres were collected, and the attached residue was removed by a vibration draining device to obtain the intermediate substance 4.

[0080] S5. The intermediate substance 4 was added to a 2.0 wt% calcium chloride solution at a solid-liquid ratio of 300 g / L and crosslinked and cured for 6 h to obtain intermediate substance 5;

[0081] S6. Collect the intermediate substance 5, wash it until neutral, and freeze-dry it under vacuum for 12 hours to obtain the final product.

[0082] Comparative Example 1

[0083] A method for activating and regenerating aged and deteriorated biochar-based alginate composite carrier material. The difference between this comparative example and Example 1 is that the phosphoric acid in step S3 is replaced with an equal volume of 2.0 wt% citric acid, while the other steps are the same as in Example 1.

[0084] Comparative Example 2

[0085] A method for activating and regenerating aged and deteriorated biochar-based alginate composite carrier material. The difference between this comparative example and Example 1 is that step S2 cleaning and swelling treatment was not performed, while the other steps are the same as in Example 1.

[0086] Test case

[0087] The performance of the composite carrier samples treated in Examples 1-5 and Comparative Examples 1-2 was tested using the following methods.

[0088] Adsorption test: 0.5g of the composite carrier sample microspheres obtained in Examples 1-5 and Comparative Examples 1-2 were weighed and added to a conical flask containing 100mL of 0.8g / L methylene blue solution. The mixture was magnetically stirred and reacted for 48h. The supernatant of the methylene blue solution was taken before and after the addition of the composite carrier sample microspheres and after 48h. The absorbance value at a wavelength of 665nm was measured. The concentration of the methylene blue solution before and after the addition was calculated. The adsorption performance was evaluated according to the concentration change rate. The larger the absolute value of the change rate, the better the performance.

[0089] Dissolution test: Weigh 0.5g of the composite carrier sample microspheres obtained in Examples 1-5 and Comparative Examples 1-2 respectively, and add them to a conical flask containing 1000mL of 0.8g / L methylene blue solution. Stir magnetically and allow the reaction to proceed until the solution color shows no change. Collect the composite carrier material, dry it to remove excess water, and weigh 0.2g of the saturated sample respectively. Add the sample to a conical flask containing 100mL of ultrapure water, stir magnetically, and allow the reaction to proceed for 24h. After standing for a while, take the supernatant and measure its absorbance value at a wavelength of 665nm. Calculate the concentration of methylene blue solution before and after addition. Evaluate the dissolution of pollutants based on the concentration change rate; the smaller the absolute value of the change rate, the better the performance.

[0090] The specific experimental results are shown in the table below:

[0091] Table 1 Performance test results of composite carrier material samples

[0092]

[0093] Table 1 shows that the activated and regenerated biochar-based alginate composite carrier material of the present invention has strong adsorption performance and reduces the risk of pollutant leaching, effectively avoiding secondary potential environmental pollution and hazards, and has good application prospects.

[0094] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0095] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An aging failure biochar-based alginate composite carrier material activation recycling method, characterized in that, Includes the following steps: S1. The aged and failed biochar-based alginate composite carrier material was screened to obtain intermediate substance 1; S2. The intermediate substance 1 is washed, swollen, and purified to obtain intermediate substance 2; S3. The intermediate substance 2 is added to an acid solution, stirred and reacted, and then purified to obtain intermediate substance 3; S4. Mix the intermediate substance 3 with sodium alginate solution and react with ultrasound to obtain intermediate substance 4; S5. The intermediate substance 4 is added to a calcium chloride solution for cross-linking and curing to obtain intermediate substance 5; S6. Collect, wash and purify the intermediate substance 5 to obtain the product; The composition of the aged and deteriorated biochar-based alginate composite carrier material includes 0.5-5 wt% biochar powder and 5-10 wt% alginate; In step S2, the cleaning and swelling process involves adding the intermediate substance 1 to a hydrogen peroxide solution for cleaning and swelling. In step S3, the acid is phosphoric acid and citric acid; the concentration of phosphoric acid in the acid solution is 0.5~15 wt%; and the concentration of citric acid is 1.0~10 wt%.

2. The method for activating and regenerating aged and deteriorated biochar-based alginate composite carrier material according to claim 1, characterized in that, In step S1, the particle size of the intermediate material 1 obtained by sieving is 3~5 mm.

3. The method for activating and regenerating aged and deteriorated biochar-based alginate composite carrier material according to claim 1, characterized in that, The concentration of the hydrogen peroxide solution is 5-30 wt%; the cleaning and swelling time is 1-6 h.

4. The method for activating and regenerating aged and deteriorated biochar-based alginate composite carrier material according to claim 1, characterized in that, In step S3, the stirring reaction takes 2 to 12 hours and rotates at a speed of 15 to 100 rpm.

5. The method for activating and regenerating aged and deteriorated biochar-based alginate composite carrier material according to claim 1, characterized in that, In step S4, the concentration of the sodium alginate solution is 0.5~3.0 wt%.

6. The method for activating and regenerating aged and deteriorated biochar-based alginate composite carrier material according to claim 1, characterized in that, In step S5, the concentration of the calcium chloride solution is 0.5~3.0 wt%.

7. A system for implementing the method for activating and regenerating aged and deteriorated biochar-based alginate composite carrier material according to any one of claims 1-6, characterized in that, The system includes a screening module, a swelling module, an acid leaching module, a mixing module, a solidification module, and a collection module; The screening module is used to screen the aged and failed biochar-based alginate composite carrier material to obtain intermediate substance 1. The swelling module is used to clean and swell the intermediate substance 1 to obtain intermediate substance 2 after purification; the cleaning and swelling is performed by adding the intermediate substance 1 to a hydrogen peroxide solution for cleaning and swelling. The acid leaching module is used to add the intermediate substance 2 to an acid solution, stir and react, and then purify to obtain the intermediate substance 3; the acid is phosphoric acid and citric acid; the concentration of phosphoric acid in the acid solution is 0.5~15 wt%; the concentration of citric acid is 1.0~10 wt%; The mixing module is used to mix the intermediate substance 3 with sodium alginate solution and react with ultrasound to obtain intermediate substance 4; The curing module is used to add the intermediate substance 4 to a calcium chloride solution for cross-linking and curing to obtain the intermediate substance 5; The collection module is used to collect and purify the intermediate substance 5.

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