Process for removing pollutants in industrial aquaculture tail water of penaeus vannamei boone

Abstract

The invention discloses a process for removing pollutants in industrial aquaculture tail water of penaeus vannamei boone, and belongs to the technical field of aquaculture tail water treatment. Comprising the following steps: (1) filtering breeding wastewater to remove solids; (2) compound bacteria are added into the filtered breeding wastewater for aeration treatment, aerated wastewater is obtained, and the compound bacteria comprise rhodococcus ruber, bacillus subtilis, brevibacterium halotolerans and photosynthetic bacteria according to the weight ratio of (1-2): (2-3): (3-4): (0.8-1.5); (3) adding a flocculating agent into the aerated wastewater, treating at 45-50 DEG C for 0.5-1 hour, and filtering to obtain a first filtrate; (3) adding modified activated carbon into the first filtrate, treating at 45-50 DEG C for 1-2 hours, and filtering to obtain a second filtrate; and (4) treating the second filtrate through mixed macroporous adsorption resin to obtain a third filtrate, and sterilizing the third filtrate. By combining physical, chemical and biological treatment, pollutants in the penaeus vannamei culture tail water are efficiently removed.

Description

Technical Field

[0001] This application relates to a process for removing pollutants from the wastewater of factory farming of Litopenaeus vannamei, belonging to the field of aquaculture wastewater treatment technology. Background Technology

[0002] Pollutants in the wastewater from factory farming of Litopenaeus vannamei mainly come from uneaten feed, shrimp excrement, biological metabolites, and water conditioning additives (such as disinfectants and water quality improvers) during the farming process. They may also contain trace pollutants such as antibiotics and heavy metals, which pose bioaccumulation and ecological risks.

[0003] Currently, shrimp factory farming wastewater treatment technology has formed three major systems: physical, chemical, and biological treatment. Physical treatment includes physical methods such as filtration, sedimentation, and interception, but the treatment effect is poor when used alone; chemical treatment includes chemical methods such as flocculation, oxidation-reduction, and complexation, but the cost is high when used alone; biological treatment involves using microorganisms and plants to degrade ammonia nitrogen, nitrite, and nitrate in the water, but the cost is also high when used alone.

[0004] With increasingly stringent environmental policies and the intensive upgrading of aquaculture models, existing treatment technologies are no longer able to meet the actual needs of low cost, high efficiency, easy operation and maintenance, and zero emissions. Therefore, developing efficient, economical, and stable treatment technologies suitable for the wastewater from factory farming of Litopenaeus vannamei and solving the bottleneck problems of existing technologies has become an urgent need to ensure the green and sustainable development of the aquaculture industry. Summary of the Invention

[0005] This application addresses the aforementioned problems by providing a process for removing pollutants from the wastewater of factory farming of Litopenaeus vannamei. This process combines physical, chemical, and biological treatments to achieve efficient removal of pollutants from the wastewater, improve the treatment efficiency of the wastewater from factory farming of Litopenaeus vannamei, and simultaneously achieve efficient resource recovery and utilization of the wastewater while ensuring that the wastewater meets discharge standards.

[0006] This application provides a process for removing pollutants from the effluent of factory farming of Litopenaeus vannamei, comprising the following steps: (1) Filter the aquaculture wastewater to remove solids; (2) Add compound bacteria to the filtered aquaculture wastewater for aeration treatment to obtain aerated wastewater. The amount of compound bacteria added is 6-8 g / L. The compound bacteria include Rhodococcus rubrum, Bacillus subtilis, salt-tolerant short bacilli and photosynthetic bacteria in a weight ratio of (1-2):(2-3):(3-4):(0.8-1.5). (3) Add 0.5wt%-1.0wt% of flocculant to the aerated wastewater, treat at 45-50℃ for 0.5-1h, and filter to obtain the first filtrate; (4) Add 1.5-2.0 wt% of modified activated carbon to the first filtrate, treat at 45-50℃ for 1-2 h, and filter to obtain the second filtrate; (5) The second filtrate is fed through a mixed macroporous adsorption resin at a loading flow rate of (3-5) BV / h to obtain the third filtrate, and the third filtrate is sterilized.

[0007] This process leverages the complementary advantages of biological, chemical, and physical treatments to specifically address the complex pollution in the wastewater from factory farming of Litopenaeus vannamei, thereby improving the treatment efficiency of this wastewater.

[0008] By applying compound bacteria, the entire process of synergistic purification of wastewater from Litopenaeus vannamei aquaculture can be achieved, reducing the ineffective adsorption of easily treated pollutants by activated carbon and focusing on targeted removal of high-risk pollutants: Rhodococcus rubrum targets and degrades recalcitrant organic matter in the wastewater, and can adsorb and degrade trace pollutants; Bacillus subtilis efficiently decomposes particulate or macromolecular organic matter in the wastewater, such as proteins, polysaccharides, and chitin in uneaten feed, shrimp feces, and molted shell debris; halophilic short bacilli can efficiently degrade compound organic matter, reduce the oxygen load of the water body, and can achieve simultaneous nitrogen and phosphorus conversion while utilizing organic carbon sources, thus assisting in nitrogen and phosphorus removal; photosynthetic bacteria decompose small molecular organic matter, such as amino acids and sugars, in a micro-anaerobic or anaerobic environment, assisting in the removal of COD and some nitrogen and phosphorus, and can also secrete growth-promoting factors, such as B vitamins and amino acids, improving the microecology of the aquaculture water and enhancing the shrimp's immunity.

[0009] The addition of flocculants can efficiently remove suspended particulate matter and simultaneously remove particulate nitrogen and phosphorus, providing low-load water quality for subsequent activated carbon adsorption treatment and ensuring stable effluent quality. Modified activated carbon and macroporous resin can efficiently adsorb antibiotics that cannot be degraded by complex bacteria, retain heavy metal ions, reduce biotoxicity, and improve water quality sensory quality and stability, adapting to the needs of recirculating aquaculture and providing finishing treatment for the purification process.

[0010] Specifically, the flocculant is at least one of polyaluminum ferric chloride, polyferric sulfate, and polyaluminum chloride.

[0011] Optionally, the concentration of the Rhodococcus is 1×10⁻⁶. 7 -1×10 8 CFU / ml.

[0012] Optionally, the concentration of Bacillus subtilis is 1×10⁻⁶. 7 -1×10 8 CFU / ml.

[0013] Optionally, the concentration of the salt-tolerant short bacilli is 1×10⁻⁶. 9 -1×10 10CFU / ml.

[0014] Optionally, the concentration of the photosynthetic bacteria is 1×10⁻⁶. 9 -1×10 10 CFU / ml.

[0015] Optionally, the modified activated carbon is prepared by: S1: Place the activated carbon in a dispersion of phosphoric acid and thiourea, and stir to obtain a mixture; S2: The mixture is spray-dried and calcined to obtain intermediate A; S3: Place the intermediate A in the mixed solution, treat for a certain period of time, and then dry to obtain the modified activated carbon. Modified activated carbon is first expanded with phosphoric acid, and then co-doped with thiourea. This treatment optimizes the pore structure and surface chemical properties of the activated carbon, overcoming the shortcomings of insufficient pore volume or single active sites in single-modification processes, and providing a strong guarantee for efficient adsorption. Furthermore, the improved modified porous carbon exhibits enhanced adsorption stability against impurities, enabling it to absorb more impurities with the addition of a small amount of modified activated carbon.

[0016] Specifically, the activation steps of the activated carbon are as follows: ①Dry the activated carbon and heat it to 600-800℃ in an inert gas atmosphere, and keep it at that temperature for 1-3 hours; ②After the heat preservation is completed, water vapor is introduced to raise the temperature to 800-950℃ and keep it for 1-6 hours; ③ After completion, cool to room temperature, rinse with deionized water until the pH of the filtrate is neutral, and finally dry to obtain the final product.

[0017] Optionally, the weight ratio of the activated carbon, phosphoric acid, and thiourea is 1:(0.8-1.2):(0.5-1.0).

[0018] Within this range, the maximum effects of phosphoric acid and thiourea can be fully realized: phosphoric acid can form an ideal hierarchical porous network, and thiourea can achieve the optimal N / S co-doping ratio. If the ratio of the three is unbalanced, the synergistic effect of phosphoric acid and thiourea will be weakened, and the dual enhancement of physical adsorption and chemical adsorption cannot be achieved simultaneously.

[0019] Optionally, the concentration of phosphoric acid in the dispersion of phosphoric acid and thiourea is 2wt%-6wt%.

[0020] Optionally, the spray drying temperature in step S2 is 150-250°C.

[0021] Optionally, the calcination temperature in step S2 is 800-1200℃ and the time is 0.2-1.0h.

[0022] Optionally, the heating rate of calcination in step S2 is 50-80℃ / min.

[0023] Optionally, the mixed solution in step S3 consists of glutamic acid, dodecylamine, and water in a weight ratio of (0.5-0.6):(0.3-0.5):10.

[0024] This mixed solution provides secondary functional enhancement to the modified activated carbon: glutamic acid provides amino and carboxyl bifunctional groups, exhibiting excellent biocompatibility and the ability to form hydrogen bonds and chelate with pollutants, thereby improving the adsorption capacity of pollutants; dodecylamine, as a cationic surfactant, can regulate the surface charge of activated carbon, enhance electrostatic adsorption and hydrophobic effects, and further enhance the surface adsorption performance on the basis of the already modified activated carbon, avoiding the limitations of single-component modification.

[0025] Optionally, the processing temperature in step S3 is 40-50℃, and the processing time is 3-4 hours.

[0026] The beneficial effects of this application include, but are not limited to: 1. The process for removing pollutants from the wastewater of factory farming of Litopenaeus vannamei according to this application combines physical, chemical and biological treatments to achieve efficient removal of pollutants from the wastewater of Litopenaeus vannamei farming, improve the treatment efficiency of wastewater from factory farming of Litopenaeus vannamei, and achieve efficient recycling of Litopenaeus vannamei wastewater while ensuring that the wastewater meets the discharge standards.

[0027] 2. According to the process for removing pollutants from the wastewater of factory farming of Litopenaeus vannamei in this application, the application of compound bacteria can achieve synergistic purification of wastewater from factory farming of Litopenaeus vannamei throughout the entire process, improve the micro-ecology of the farming water, and enhance the immunity of the shrimp.

[0028] 3. The process for removing pollutants from the effluent of factory farming of Litopenaeus vannamei according to this application enhances the surface adsorption performance of activated carbon by modifying it, thereby efficiently adsorbing antibiotic residues, retaining heavy metal ions, reducing biotoxicity, and improving the sensory quality and stability of the water, thus meeting the needs of recirculating aquaculture. Detailed Implementation

[0029] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0030] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application were all purchased commercially.

[0031] The Rhodococcus used in the embodiments of this application was purchased from the China Center for Type Culture Collection, with accession number CCTCC NO: M20191008.

[0032] The Bacillus subtilis used in the embodiments of this application was purchased from the China Center for Type Culture Collection, with accession number CCTCC NO: M2020355.

[0033] The salt-tolerant short bacilli used in the embodiments of this application were purchased from the China Center for Type Culture Collection, accession number CCTCC KB 20081310.

[0034] The photosynthetic bacteria used in the embodiments of this application were purchased from the China Center for Type Culture Collection, with accession number CCTCC NO: M 2022251.

[0035] The Bacillus belye used in Comparative Example 2 of this application was purchased from the China Center for Type Culture Collection, accession number CCTCC AB 200052.

[0036] The Rhodococcus rubrum used in Comparative Example 3 of this application was purchased from the China Center for Type Culture Collection, accession number CCTCC KA 2008001.

[0037] Unless otherwise specified, the methods used in the embodiments and comparative examples of this application are conventional methods in the prior art.

[0038] Example 1 This embodiment relates to a process for removing pollutants from the wastewater of factory farming of Litopenaeus vannamei, including the following steps: (1) Filter the aquaculture wastewater to remove solids; (2) Aeration treatment was carried out by adding compound bacteria to the filtered aquaculture wastewater to obtain aerated wastewater. The amount of compound bacteria added was 6 g / L. The compound bacteria included Rhodococcus rubrum, Bacillus subtilis, halophilic short bacilli, and photosynthetic bacteria in a weight ratio of 1:2:3:0.8. The concentration of Rhodococcus rubrum was 1×10⁻⁶. 7 CFU / ml, the concentration of Bacillus subtilis is 1×10⁻⁶. 8 CFU / ml; the concentration of salt-tolerant short bacilli was 1×10⁻⁶. 9 CFU / ml; the concentration of photosynthetic bacteria is 1×10⁻⁶. 10 CFU / ml; (3) Add 1.0 wt% of flocculant polyferric sulfate to the aerated wastewater, treat at 45°C for 1 h, and filter to obtain the first filtrate. (4) Add 1.5 wt% of modified activated carbon to the first filtrate, treat at 50°C for 1 h, and filter to obtain the second filtrate. (5) The second filtrate is passed through a mixed macroporous adsorption resin and processed at a loading flow rate of 3 BV / h to obtain the third filtrate, which is then sterilized.

[0039] The preparation method of modified activated carbon is as follows: ①Dry the activated carbon and heat it to 800℃ in a nitrogen inert gas atmosphere, and keep it at that temperature for 1 hour; ②After the heat preservation is completed, water vapor is introduced to raise the temperature to 950℃ and keep it warm for 1 hour; ③ After the process is completed, cool to room temperature, rinse with deionized water until the pH of the filtrate is neutral, and finally dry to obtain the activated carbon; S1: The activated carbon is placed in a dispersion of phosphoric acid and thiourea and stirred to obtain a mixed solution. The weight ratio of activated carbon, phosphoric acid and thiourea is 1:0.8:0.5, and the concentration of phosphoric acid in the dispersion of phosphoric acid and thiourea is 2wt%. S2: The mixture is spray-dried at 150°C and then calcined at 800°C for 1.0 h at a heating rate of 50°C / min to obtain intermediate A; S3: The intermediate A is placed in a mixed solution of glutamic acid, dodecylamine and water in a weight ratio of 0.5:0.3:10 and treated at 40°C for 4 hours. After drying, the modified activated carbon is obtained.

[0040] Example 2 This embodiment relates to a process for removing pollutants from the wastewater of factory farming of Litopenaeus vannamei, including the following steps: (1) Filter the aquaculture wastewater to remove solids; (2) Aeration treatment was carried out by adding compound bacteria to the filtered aquaculture wastewater to obtain aerated wastewater. The amount of compound bacteria added was 8 g / L. The compound bacteria included Rhodococcus rubrum, Bacillus subtilis, halophilic short bacilli, and photosynthetic bacteria in a weight ratio of 2:3:4:1.5. The concentration of Rhodococcus rubrum was 1×10⁻⁶. 8 CFU / ml, the concentration of Bacillus subtilis is 1×10⁻⁶. 7 CFU / ml; the concentration of salt-tolerant short bacilli was 1×10⁻⁶. 10 CFU / ml; the concentration of photosynthetic bacteria is 1×10⁻⁶. 9 CFU / ml; (3) Add 0.5 wt% of polyaluminum chloride flocculant to the aerated wastewater, treat at 50°C for 0.5 h, and filter to obtain the first filtrate; (4) Add 2.0 wt% of modified activated carbon to the first filtrate, treat at 45°C for 2 h, and filter to obtain the second filtrate. (5) The second filtrate is passed through a mixed macroporous adsorption resin and processed at a loading flow rate of 5 BV / h to obtain the third filtrate, which is then sterilized.

[0041] The preparation method of modified activated carbon is as follows: ①Dry the activated carbon and heat it to 600℃ in a nitrogen inert gas atmosphere, and keep it at that temperature for 3 hours; ②After the heat preservation is completed, water vapor is introduced to raise the temperature to 800℃ and keep it warm for 6 hours; ③ After the process is completed, cool to room temperature, rinse with deionized water until the pH of the filtrate is neutral, and finally dry to obtain the activated carbon; S1: The activated carbon is placed in a dispersion of phosphoric acid and thiourea and stirred to obtain a mixed solution. The weight ratio of activated carbon, phosphoric acid and thiourea is 1:1.2:1.0, and the concentration of phosphoric acid in the dispersion of phosphoric acid and thiourea is 6 wt%. S2: The mixture is spray-dried at 250°C and then calcined at 1200°C for 0.2 hours at a heating rate of 80°C / min to obtain intermediate A; S3: The intermediate A is placed in a mixed solution of glutamic acid, dodecylamine and water in a weight ratio of 0.6:0.5:10 and treated at 50°C for 3 hours. After drying, the modified activated carbon is obtained.

[0042] Example 3 This embodiment relates to a process for removing pollutants from the wastewater of factory farming of Litopenaeus vannamei, including the following steps: (1) Filter the aquaculture wastewater to remove solids; (2) Aeration treatment was carried out by adding compound bacteria to the filtered aquaculture wastewater to obtain aerated wastewater. The amount of compound bacteria added was 8 g / L. The compound bacteria included Rhodococcus rubrum, Bacillus subtilis, halophilic short bacilli, and photosynthetic bacteria in a weight ratio of 1.5:2:3:1.2. The concentration of Rhodococcus rubrum was 1×10⁻⁶. 8 CFU / ml, the concentration of Bacillus subtilis is 1×10⁻⁶. 7 CFU / ml; the concentration of salt-tolerant short bacilli was 1×10⁻⁶. 10 CFU / ml; the concentration of photosynthetic bacteria is 1×10⁻⁶. 9 CFU / ml; (3) Add 0.8 wt% of flocculant polyaluminum ferric chloride to the aerated wastewater, treat at 48°C for 0.8 h, and filter to obtain the first filtrate; (4) Add 1.8 wt% of modified activated carbon to the first filtrate, treat at 45°C for 2 h, and filter to obtain the second filtrate. (5) The second filtrate is passed through a mixed macroporous adsorption resin and processed at a loading flow rate of 5 BV / h to obtain the third filtrate, which is then sterilized.

[0043] The preparation method of modified activated carbon is as follows: ①Dry the activated carbon and heat it to 750℃ in a nitrogen inert gas atmosphere, and keep it at that temperature for 2.5 hours; ②After the heat preservation is completed, water vapor is introduced to raise the temperature to 900℃ and keep it warm for 4 hours; ③ After the process is completed, cool to room temperature, rinse with deionized water until the pH of the filtrate is neutral, and finally dry to obtain the activated carbon; S1: The activated carbon is placed in a dispersion of phosphoric acid and thiourea and stirred to obtain a mixed solution. The weight ratio of activated carbon, phosphoric acid and thiourea is 1:1.0:0.8, and the concentration of phosphoric acid in the dispersion of phosphoric acid and thiourea is 5 wt%. S2: The mixture is spray-dried at 200°C and then calcined at 1000°C for 0.5 hours at a heating rate of 60°C / min to obtain intermediate A. S3: The intermediate A is placed in a mixed solution of glutamic acid, dodecylamine and water in a weight ratio of 0.5:0.4:10 and treated at 45°C for 4 hours. After drying, the modified activated carbon is obtained.

[0044] Example 4 The difference between Example 4 and Example 3 is that the weight ratio of activated carbon, phosphoric acid and thiourea after activation in step S1 is 1:1.3:0.8, while the rest are the same.

[0045] Example 5 The difference between Example 5 and Example 3 is that the weight ratio of activated carbon, phosphoric acid and thiourea after activation in step S1 is 1:1.0:1.1, while the rest are the same.

[0046] Example 6 The difference between Example 6 and Example 3 is that the mixed solution in step S3 consists of glutamic acid, dodecylamine and water in a weight ratio of 0.7:0.4:10, while the rest are the same.

[0047] Example 7 The difference between Example 7 and Example 3 is that the mixed solution in step S3 consists of glutamic acid, dodecylamine and water in a weight ratio of 0.5:0.6:10, while the rest are the same.

[0048] Example 8 The difference between Example 8 and Example 3 is that thioacetamide is used instead of thiourea in step S1, while the rest are the same.

[0049] Example 9 The difference between Example 9 and Example 3 is that the mixed solution from step S3 is added to the dispersion of phosphoric acid and thiourea in step S1, but step S3 is omitted; all other steps are the same.

[0050] Example 10 The difference between Example 10 and Example 3 is that the mixed solution in step S3 consists of citric acid, octadecylamine and water in a weight ratio of 0.5:0.4:1, while the rest are the same.

[0051] Example 11 The difference between Example 11 and Example 3 is that step S3 is omitted, while the rest are the same.

[0052] Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that the amount of compound bacteria added in step (2) is 9 g / L, while the rest are the same.

[0053] Comparative Example 2 The difference between Comparative Example 2 and Example 3 is that Bacillus berreatus was used instead of salt-tolerant short bacilli in step (2) of the compound bacteria, while the rest were the same.

[0054] Comparative Example 3 The difference between Comparative Example 3 and Example 3 is that Rhodococcus rubrum is used instead of Rhodococcus erythrosporum in step (2) of the compound bacteria, while the rest are the same.

[0055] Comparative Example 4 The difference between Comparative Example 4 and Example 3 is that the compound bacteria in step (2) include Rhodococcus erythrosiformis, Bacillus subtilis, salt-tolerant short bacilli and photosynthetic bacteria in a weight ratio of 2.4:3.2:3:1.2, and the rest are the same.

[0056] Comparative Example 5 The difference between Comparative Example 5 and Example 3 is that the compound bacteria in step (2) include Rhodococcus erythrosiformis, Bacillus subtilis, salt-tolerant short bacilli and photosynthetic bacteria in a weight ratio of 1.5:2:4.2:1.7, and the rest are the same.

[0057] Comparative Example 6 The difference between Comparative Example 6 and Example 3 is that: in step (3), unmodified activated carbon is used, steps S1-S3 are omitted, and only the activated carbon obtained in steps ①-③ is used to treat the first filtrate. The rest are the same.

[0058] Test case The water samples treated by the above-described embodiments and comparative examples were tested for total nitrogen, total phosphorus, chemical oxygen demand, suspended particulate matter, and pH value. The test results are shown in Table 1. The specific test methods are as follows: Total nitrogen: Digested with alkaline potassium persulfate at 120℃ for 30 min and then determined by ultraviolet spectrophotometry, according to HJ 636-2012. Total phosphorus: Digested with potassium persulfate at 120℃ for 30 min and then determined by ammonium molybdate spectrophotometry, according to GB 11893-1989. Chemical oxygen demand (COD): Diluted with dichromate at 170℃ for 2 hours under strong oxidation, and the determination standard is GB / T11914-1989. Suspended particulate matter (SS): The water sample was filtered through a 0.45 μm filter membrane, dried at 103-105℃ to constant weight, weighed, and the difference was calculated. The determination standard is GB 11901-1989. pH value: determined by glass electrode method, the standard for determination is GB / T 6920-1986.

[0059] Table 1

[0060] According to the data in Table 1, the water samples treated in Examples 1-11 achieved efficient removal of pollutants from the tailwater of Litopenaeus vannamei farming, meeting the standards for circulating water samples. Among them, the treatment effect of Example 3 was the best. The treatment of water samples in Comparative Examples 1-6 was significantly poor, indicating that the bacterial composite in this application has a significant effect on the treatment of pollutants in the water samples, and that the adsorption effect of activated carbon after two-step modification is stronger. The adsorption effect of Example 9, which combines two-step modification into one step, and Example 11, which only modifies activated carbon in one step, were significantly worse than that of Example 3.

[0061] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, this application is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of this application without departing from the scope of this application should be within the protection scope of this application.

Claims

1. A process for removing pollutants from the effluent of the factory farming of Penaeus vannamei, characterized by, The method comprises the following steps: (1) filtering the aquaculture wastewater to remove solid matters; (2) adding composite bacteria into the filtered aquaculture wastewater for aeration treatment to obtain aeration wastewater, the adding amount of the composite bacteria being 6-8 g / L, the composite bacteria comprising Rhodococcus ruber, Bacillus subtilis, Halobacillus halophilus and photosynthetic bacteria at a weight ratio of (1-2):(2-3):(3-4):(0.8-1.5); (3) adding a flocculating agent accounting for 0.5wt%-1.0wt% of the aeration wastewater into the aeration wastewater, treating at 45-50℃ for 0.5-1h, and filtering to obtain a first filtrate; (4) adding modified activated carbon accounting for 1.5-2.0wt% of the first filtrate into the first filtrate, treating at 45-50℃ for 1-2h, and filtering to obtain a second filtrate; (5) flowing and mixing the second filtrate through a macroporous adsorption resin at a feeding flow rate of (3-5) BV / h to obtain a third filtrate, and sterilizing the third filtrate.

2. The process for removal of pollutants from P. vannamei farmed shrimp factory effluent as claimed in claim 1, wherein, The concentration of said Rhodococcus is 1 x 10 7 -1 x 10 8 CFU / ml; The concentration of the Bacillus subtilis is 1 x 10 7 -1 x 10 8 CFU / ml; The concentration of the salt-tolerant Brevibacterium is 1 x 10 9 -1 x 10 10 CFU / ml; The concentration of the photosynthetic bacteria is 1 x 10 9 -1 x 10 10 CFU / ml.

3. The process for removal of pollutants from P. vannamei farmed shrimp factory effluent as claimed in claim 1, wherein, The preparation method of the modified activated carbon is as follows: S1: placing activated activated carbon in a dispersion liquid of phosphoric acid and thiourea, and stirring to obtain a mixed liquid; S2: spray drying and calcining the mixed liquid to obtain an intermediate A; S3: placing the intermediate A in a mixed solution, drying after a certain period of treatment, and obtaining the modified activated carbon.

4. The process for removal of pollutants from P. vannamei farmed shrimp factory effluent as claimed in claim 3 wherein, The weight ratio of the activated activated carbon, the phosphoric acid and the thiourea is 1:(0.8-1.2):(0.5-1.0).

5. The process for removal of pollutants from P. vannamei farmed shrimp factory effluent as claimed in claim 4 wherein, The concentration of the phosphoric acid in the dispersion liquid of the phosphoric acid and the thiourea is 2wt%-6wt%.

6. The process for removal of pollutants from P. vannamei farmed shrimp factory effluent as claimed in claim 3 wherein, The temperature of the spray drying in step S2 is 150-250℃.

7. The process for removal of pollutants from P. vannamei farmed shrimp factory effluent as claimed in claim 3 wherein, The temperature of the calcining in step S2 is 800-1200℃, and the time is 0.2-1.0h.

8. The process for removal of pollutants from P. vannamei farmed shrimp factory effluent as claimed in claim 3 wherein, The heating rate of the calcining in step S2 is 50-80℃ / min.

9. The process for removal of pollutants from P. vannamei farmed shrimp factory effluent as claimed in claim 3 wherein, The mixed solution in step S3 is composed of glutamic acid, dodecylamine and water at a weight ratio of (0.5-0.6):(0.3-0.5):

10.

10. The process for removal of pollutants from P. vannamei farmed shrimp factory effluent as claimed in claim 9 wherein, The treatment temperature in step S3 is 40-50℃, and the treatment time is 3-4h.

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