Device and method for extracting high-carbon-nitrogen-ratio fermentation liquor by strengthening organic waste fermentation

Abstract

The invention belongs to the technical field of organic waste treatment, and discloses a device and a method for enhancing organic waste fermentation to extract a high-carbon-nitrogen-ratio fermentation broth, carboxyl is loaded on the surface of a fiber material to prepare carboxyl chelate fibers, the carboxyl chelate fibers are applied to the organic waste treatment process, the active carboxyl chelate fibers chelate and adsorb ammonia nitrogen on the surface of the carboxyl, and the active carboxyl chelate fibers adsorb the ammonia nitrogen on the surface of the carboxyl to prepare the high-carbon-nitrogen-ratio fermentation broth. Separation and removal of ammonia nitrogen in the organic waste fermentation liquor are realized, and the fermentation liquor with high C: N content is extracted as carbon source liquor, so that the carbon source recovery quality is improved; meanwhile, ammonia nitrogen in the carboxyl chelate fiber is desorbed, ammonia nitrogen enrichment is achieved, and ammonia nitrogen recycling is facilitated.

Description

Technical Field

[0001] This application belongs to the technical field of organic waste treatment, and particularly relates to a device and method for enhancing the fermentation of organic waste to extract fermentation broth with a high carbon-nitrogen ratio. Background Art

[0002] Organic wastes such as sludge and food waste are rich in organic matter, which contains a large amount of carbon sources. After proper treatment, they can be used as supplementary carbon sources for sewage treatment plants, carbon source raw materials for chemical production, carbon source substrates for bioelectricity generation or biohydrogen production, and carbon source substrates for the synthesis of biodegradable plastics, thereby realizing the recycling of carbon sources from organic wastes and having great potential for resource utilization. However, the organic matter in organic wastes not only contains carbon source components but also a large amount of nitrogen source components, resulting in too low C:N, which limits the quality of carbon source recovery. Therefore, if the nitrogen source components can be separated and removed from organic wastes while retaining the carbon source components, the C:N of organic wastes can be increased, and the quality of carbon source recovery can be improved. Anaerobic fermentation is widely regarded as an optimal way for the resource treatment of organic wastes, which can convert the organic matter of organic wastes into volatile fatty acids. In this process, the organic nitrogen in the organic matter can be converted into ammonia nitrogen, which is more easily separated and removed. If these ammonia nitrogen can be separated and removed, the C:N of organic wastes can be greatly increased, the quality of carbon source recovery of organic wastes can be improved, and at the same time, these separated ammonia nitrogen are also raw materials for chemical industry, pharmaceutical industry and agricultural fertilizer production, with resource value.

[0003] In response to the need for ammonia nitrogen removal and separation from organic wastes, currently, methods such as alkali adjustment-nitrogen blowing and struvite precipitation are mostly used. The alkali adjustment-nitrogen blowing method refers to adding alkaline agents to adjust the system to an alkaline condition, so that ammonia nitrogen is converted into ammonia gas, and then blown off by aeration. However, the alkali adjustment-nitrogen blowing method requires a large amount of alkaline agents, which cannot be reused, and the energy consumption of aeration blowing is relatively high, resulting in too high costs. In addition, the ammonia nitrogen concentration in organic wastes itself is insufficient and does not reach the condition of high-concentration ammonia nitrogen, so the alkali adjustment-nitrogen blowing method has poor enrichment effect on ammonia nitrogen and is not conducive to the recovery and utilization of ammonia nitrogen. The struvite precipitation method refers to adding Mg 2+ , and at the same time adjusting the ratios of Mg 2+ , NH4 + , PO4 2- and pH conditions to form struvite precipitation, so as to separate and remove ammonia nitrogen and recover and utilize ammonia nitrogen. However, the reaction conditions of the struvite precipitation method are harsh, and the ratios of Mg 2+ , NH4 + , PO4 2- are generally difficult to meet the requirements and need to be artificially adjusted. The costs of adding Mg 2+ and adjusting pH are relatively high, and the reaction is slow at normal temperature. Therefore, it is urgent to develop a new method for improving the carbon-nitrogen ratio and separating and enriching ammonia nitrogen from organic wastes with high economy and efficiency. Summary of the Invention

[0004] The purpose of this application is to solve the problems of the prior art and provide a device and method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio.

[0005] To solve the technical problems, the technical solution of this application is: A method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio, including the following steps: Step 1: Pretreat and activate carboxyl chelating fiber with an activation solution to obtain activated carboxyl chelating fiber; Step 2: Anaerobically ferment the organic waste at 30-60 o °C for 3-10 days with a stirring speed of 50-200 rpm, convert the macromolecular complex organic matter in the organic waste into small molecule carbon source substances, and convert the organic nitrogen into ammonia nitrogen to obtain fermented waste A after anaerobic fermentation treatment; Step 3: Mechanically dehydrate the fermented waste A after anaerobic fermentation treatment to obtain a dehydrated filtrate, which is the organic waste fermentation broth B; Step 4: Add 1-10 g / L of sodium ethylenediaminetetraacetate to the organic waste fermentation broth B to convert the polyvalent metal ions in the organic waste fermentation broth B into a chelated form; Step 5: Adjust the organic waste fermentation broth B to an acidic condition with a pH of 5.5-7.0 to promote the conversion of ammonia nitrogen in the organic waste fermentation broth B from the molecular state to the ionic state to obtain the organic waste fermentation broth C after pH adjustment; Step 6: Add the activated carboxyl chelating fiber in Step 1 into the organic waste fermentation broth C at a dosage of 20-60 g / L to obtain a mixture D of the activated carboxyl chelating fiber and the organic waste fermentation broth C; Step 7: Stir the mixture D for 5-10 hours, control the stirring speed at 100-300 rpm, and control the reaction temperature at 15-70 o °C; Step 8: Use a filter screen to separate the solid and liquid of the mixture D to obtain the separated fermentation broth E, and recycle the activated carboxyl chelating fiber that adsorbs ammonia nitrogen; Step 9: Detect the C:N value of the fermentation broth E. If C:N>13:1, recycle the fermentation broth E for use as a high-quality carbon source liquid; if C:N≤13:1, repeat Steps 4-Step 8 until C:N>13:1; Step 10: Perform ammonia nitrogen desorption treatment on the activated carboxyl chelating fiber that adsorbs ammonia nitrogen with a desorption solution, and reuse the activated carboxyl chelating fiber after desorption treatment.

[0006] Preferably, in step 1, the average diameter of the carboxyl chelating fiber ≥ 2 mm, the functional group of the carboxyl chelating fiber is carboxyl, the activating solution is 1 mol / L sodium hydroxide solution, and the ion chelating ability of the carboxyl chelating fiber after pretreatment with the activating solution ≥ 1.0 mmole - / g.

[0007] Preferably, in step 2, the organic waste includes one or more of sludge, organic garbage, and kitchen waste, and in step 3, the ammonia nitrogen in the organic waste fermentation broth B accounts for more than 70% of the total nitrogen.

[0008] Preferably, after adding sodium ethylenediaminetetraacetate in step 4, the total content of ionic multivalent metals in the organic waste fermentation broth B ≤ 0.5 mmol / L, so as not to interfere with the adsorption of ammonia nitrogen by the active carboxyl chelating fiber in steps 6 and 7.

[0009] Preferably, after adjusting the pH of the organic waste fermentation broth B to acidic in step 5, the ionic ammonia nitrogen accounts for more than 80% of the total ammonia nitrogen.

[0010] Preferably, in step 7, when the reaction temperature is 15~35 o °C, the dosage of the active carboxyl chelating fiber in step 6 is 40~60 g / L, and the stirring time is 7~10 hours; when the reaction temperature in step 7 is 35~70 o °C, the dosage of the active carboxyl chelating fiber in step 6 is 20~40 g / L, and the stirring time is 5~7 hours.

[0011] Preferably, in step 10, the desorbing solution is 1 mol / L sodium hydroxide desorbing solution, the volume of the desorbing solution is 3~5 times the volume of the active carboxyl chelating fiber adsorbing ammonia nitrogen, the desorbing treatment time is 1~3 hours, and the stirring speed is controlled at 100~200 rpm; The desorbing solution can be reused 5~20 times. Until the ammonia nitrogen content of the desorbing solution > 0.5 mol / L, the desorbing solution fails and needs to be replaced; the failed desorbing solution is rich in a large amount of ammonia nitrogen and is strongly alkaline. NH3 is removed by aeration stripping for ammonia purification and recycling.

[0012] Preferably, a device for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio is used for implementing the above method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio, including a chelating fiber activation and desorption module, an anaerobic fermentation module, an organic waste dehydration module, a reactor module, a chelating fiber separation module, a detection module, and a control module. The chelating fiber activation and desorption module, the anaerobic fermentation module, the organic waste dehydration module, the reactor module, the chelating fiber separation module, and the detection module are respectively electrically connected to the control module; The chelating fiber activation and release module includes a first reactor, a first stirring device, an activation liquid storage tank, an activation liquid delivery pump, a release liquid delivery pump, and a release liquid storage tank. The activation liquid storage tank is connected to the activation liquid inlet and outlet of the first reactor through the activation liquid delivery pump. The release liquid storage tank is connected to the release liquid inlet and outlet of the first reactor through the release liquid delivery pump. The first stirring device is arranged inside the first reactor. A chelating fiber feeding port is arranged at the top of the first reactor. The chelating fiber feeding port is used for feeding carboxyl chelating fiber. The carboxyl chelating fiber is pretreated and activated to obtain activated carboxyl chelating fiber. A chelating fiber extraction port and a release liquid discharge port are arranged at the bottom of the first reactor. A release liquid discharge port filter screen is arranged inside the release liquid discharge port. The anaerobic fermentation module includes an anaerobic fermentation tank, a second stirring device, and a temperature regulating device. The second stirring device and the temperature regulating device are arranged inside the anaerobic fermentation tank. An organic waste feeding port is arranged at the bottom of the anaerobic fermentation tank. An organic waste discharge port is arranged on the upper side of the anaerobic fermentation tank. The organic waste discharge port is connected to a mechanical dehydrator of the organic waste dehydration module. The reactor module includes a second reactor, a first feeding pump, a third stirring device, and a temperature monitoring and control device. A sodium ethylenediaminetetraacetate feeding port, an acidity regulating port, an organic waste fermentation liquid feeding port, and an activated chelating fiber feeding port are arranged at the top of the second reactor. The mechanical dehydrator is connected to the organic waste fermentation liquid feeding port through the first feeding pump. The chelating fiber extraction port is connected to the activated chelating fiber feeding port. The third stirring device and the temperature monitoring and control device are arranged inside the second reactor. A first material discharge port is arranged at the bottom of the second reactor. The chelating fiber separation module includes a chelating fiber separation tank, a second feeding pump, and a chelating fiber separation tank filter screen. A chelating fiber separation tank feeding port is arranged at the top of the chelating fiber separation tank. The chelating fiber separation tank filter screen is arranged below the chelating fiber separation tank feeding port. The first material discharge port is connected to the chelating fiber separation tank feeding port through the second feeding pump. A second material discharge port is arranged at the bottom of the chelating fiber separation tank. The activated carboxyl chelating fiber adsorbed with ammonia nitrogen separated by the chelating fiber separation tank filter screen is fed into the chelating fiber feeding port for ammonia nitrogen release treatment. The detection module includes a carbon-nitrogen detector, an ammonia-nitrogen detector, and a pH detection device. The carbon-nitrogen detector is used to detect the C:N value of the fermentation liquid E discharged from the second material discharge port. The ammonia-nitrogen detector is used to detect the ammonia nitrogen chelating ability of the activated carboxyl chelating fiber after the release liquid treatment in the first reactor. The pH detection device is used to detect the pH value of the organic waste fermentation liquid B in the second reactor.

[0013] Preferably, the release liquid inlet and outlet are arranged on the lower side of the first reactor, and the activation liquid inlet and outlet are arranged on the upper side of the first reactor.

[0014] Preferably, the first reactor is a cylindrical reactor with a ratio of R:H = 1:1, the second reactor is a cylindrical reactor with a ratio of R:H = 3:1 to 1:3, the chelating fiber separation tank is a cube separation tank with a ratio of L:B:H = 1:1:1, and the pore size of the filter screen of the chelating fiber separation tank is < 1 mm.

[0015] Compared with the prior art, the advantages of the present application are as follows: (1) The present application discloses a method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio. Carboxyl groups are loaded on the surface of fiber materials to form carboxyl chelating fibers, which are applied to the process of organic waste treatment. The active carboxyl chelating fibers chelate and adsorb ammonia nitrogen on the carboxyl surface, realizing the separation and removal of ammonia nitrogen in the organic waste fermentation broth, extracting the fermentation broth with a high C:N as the carbon source liquid, and improving the quality of carbon source recovery. At the same time, the ammonia nitrogen in the carboxyl chelating fibers is desorbed, realizing the enrichment of ammonia nitrogen, which is beneficial to the recycling of ammonia nitrogen; (2) In the method of the present application, the organic waste is first anaerobically fermented to convert the organic nitrogen in the organic waste into ammonia nitrogen. After mechanical dehydration, the fermentation broth is obtained, and the fermentation broth is adjusted to an acidic condition to convert the molecular ammonia nitrogen into ionic ammonia nitrogen, which is beneficial to the separation and removal of ammonia nitrogen by carboxyl chelating fibers; (3) Before removing ammonia nitrogen, the present application uses sodium ethylenediaminetetraacetate to convert the polyvalent metal ions in the organic waste fermentation broth B into a chelated form, avoiding affecting the treatment effect of subsequent active carboxyl chelating fibers, and improving the removal effect of active carboxyl chelating fibers on ammonia nitrogen; (4) After use, the carboxyl chelating fibers of the present application can be desorbed with a sodium hydroxide desorbing solution and can be reused after desorption, realizing the long-term recycling of carboxyl chelating fibers and reducing the cost. The carboxyl chelating fibers can be quickly separated and recovered, leaving no drug residues in the sludge and fermentation broth, not affecting the subsequent utilization of the fermentation broth, and posing no environmental threat, solving the drawbacks of traditional methods such as alkali adjustment - stripping and struvite precipitation, which require the addition of alkali agents, Mg 2+ , PO4 2- and other agents, and the drug residues caused by the inability to separate and recover affect the subsequent utilization of the fermentation broth; (5) During the desorption and reuse process of the carboxyl chelating fibers of the present application, the sodium hydroxide desorbing solution can also be reused, which not only further reduces the treatment cost, but also realizes the large-scale enrichment of ammonia nitrogen desorption, increases the ammonia nitrogen concentration. At this time, the strong alkalinity of the sodium hydroxide desorbing solution can realize the recycling of high-concentration ammonia during the aeration stripping process, providing an additional benefit of economically convenient ammonia nitrogen recovery with relatively high concentration and purity; (6) The removal rate of ammonia nitrogen in the organic waste fermentation broth of the present application exceeds 70%, and the C:N of the obtained fermentation broth > 13:1, improving the biological availability of the carbon source in the fermentation broth. It belongs to an ultra-high-quality carbon source, meets the requirements of current engineering practice, and has obvious advantages compared with similar products. Brief Description of the Drawings

[0016] Figure 1 is a reaction flow chart of a method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio in this application; Figure 2 is a schematic structural diagram of a device for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio in this application.

[0017] Description of the Reference Numerals: 1 - First reactor; 2 - Chelating fiber feeding port; 3 - First stirring device; 4 - Activating liquid storage tank; 5 - Activating liquid delivery pump; 6 - Chelating fiber extraction port; 7 - Anaerobic fermentation tank; 8 - Organic waste feeding port; 9 - Organic waste discharge port; 10 - Second stirring device; 11 - Temperature regulating device; 12 - Mechanical dehydrator; 13 - Second reactor; 14 - Sodium ethylenediaminetetraacetate feeding port; 15 - Acidic regulating port; 16 - pH detection device; 17 - First feed pump; 18 - Organic waste fermentation broth feeding port; 19 - Activated chelating fiber feeding port; 20 - Third stirring device; 21 - Temperature monitoring and control device; 22 - First material discharge port; 23 - Chelating fiber separation tank; 24 - Second feed pump; 25 - Chelating fiber separation tank feed port; 26 - Chelating fiber separation tank filter screen; 27 - Second material discharge port; 28 - Carbon-nitrogen detector; 29 - Ammonia-nitrogen detector; 30 - Desorption liquid delivery pump; 31 - Desorption liquid storage tank; 32 - Desorption liquid inlet and outlet; 33 - Desorption liquid discharge port; 34 - Activating liquid inlet and outlet. Detailed Embodiments

[0018] The following describes this application in detail with reference to the drawings and specific embodiments, but this application is not limited to these embodiments. This application covers any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this application. For the public to have a thorough understanding of this application, specific details are described in detail in the following embodiments of this application, but those skilled in the art can fully understand this application without these detailed descriptions.

[0019] As Figure 1 shown, this application discloses a method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio, including the following steps: Step 1: Pretreat and activate the carboxyl chelating fiber with an activating liquid to obtain activated carboxyl chelating fiber; Step 2: Anaerobically ferment the organic waste at 30 - 60 o °C for 3 - 10 days, with a stirring speed of 50 - 200 rpm, convert the macromolecular complex organic substances in the organic waste into small-molecule carbon source substances, and convert the organic nitrogen into ammonia nitrogen to obtain the fermented waste A after anaerobic fermentation treatment; Step 3: Mechanically dehydrate the fermented waste A after anaerobic fermentation treatment to obtain a dehydrated filtrate, i.e., the organic waste fermentation liquid B; Step 4: Add 1 - 10 g / L of sodium ethylenediaminetetraacetate to the organic waste fermentation liquid B to convert the polyvalent metal ions in the organic waste fermentation liquid B into a chelated form; Step 5: Adjust the organic waste fermentation liquid B to an acidic condition with a pH of 5.5 - 7.0 to promote the conversion of ammonia nitrogen in the organic waste fermentation liquid B from the molecular state to the ionic state, obtaining the adjusted pH organic waste fermentation liquid C; Step 6: Add the live carboxyl chelating fiber from Step 1 into the organic waste fermentation liquid C at a dosage of 20 - 60 g / L to obtain a mixture D of the live carboxyl chelating fiber and the organic waste fermentation liquid C; Step 7: Stir the mixture D for 5 - 10 hours, control the stirring speed at 100 - 300 rpm, and control the reaction temperature at 15 - 70 o °C; Step 8: Use a filter screen to perform solid - liquid separation on the mixture D to obtain the separated fermentation liquid E, and recycle the live carboxyl chelating fiber that has adsorbed ammonia nitrogen (NH4 + ); Step 9: Detect the C:N value of the fermentation liquid E. If C:N > 13:1, recycle the fermentation liquid E for use as a high - quality carbon source liquid; if C:N ≤ 13:1, repeat Steps 4 - 8 until C:N > 13:1; Step 10: Perform ammonia nitrogen desorption treatment on the live carboxyl chelating fiber that has adsorbed ammonia nitrogen using a desorption liquid, and reuse the desorbed live carboxyl chelating fiber.

[0020] Preferably, in Step 1, the average diameter of the carboxyl chelating fiber ≥ 2 mm, the functional group of the carboxyl chelating fiber is a carboxyl group, the activation liquid is a 1 mol / L sodium hydroxide solution, and the ion chelating ability of the carboxyl chelating fiber after pretreatment activation with the activation liquid ≥ 1.0 mmole - / g.

[0021] Preferably, in Step 2, the organic waste includes one or more of sludge, organic garbage, and kitchen waste, and in Step 3, the ammonia nitrogen in the organic waste fermentation liquid B accounts for more than 70% of the total nitrogen.

[0022] Preferably, after adding sodium ethylenediaminetetraacetate in Step 4, the total content of ionic polyvalent metals in the organic waste fermentation liquid B ≤ 0.5 mmol / L, so as not to interfere with the adsorption of ammonia nitrogen by the live carboxyl chelating fiber in Steps 6 and 7.

[0023] Preferably, after the acidic pH adjustment of the organic waste fermentation broth B in step 5, the ionic ammonia nitrogen accounts for more than 80% of the total ammonia nitrogen.

[0024] Preferably, in step 7, when the reaction temperature is 15 - 35 o °C, the dosage of the active carboxyl chelating fiber in step 6 is 40 - 60 g / L, and the stirring time is 7 - 10 hours; when the reaction temperature in step 7 is 35 - 70 o °C, the dosage of the active carboxyl chelating fiber in step 6 is 20 - 40 g / L, and the stirring time is 5 - 7 hours.

[0025] Preferably, in step 10, the eluent is 1 mol / L sodium hydroxide eluent. The volume of the eluent is 3 - 5 times the volume of the active carboxyl chelating fiber that adsorbs ammonia nitrogen. The elution treatment time is 1 - 3 hours, and the stirring speed is controlled at 100 - 200 rpm; The eluent can be reused 5 - 20 times. Until the ammonia nitrogen content of the eluent > 0.5 mol / L, the eluent fails and needs to be replaced; the failed eluent is rich in a large amount of ammonia nitrogen and is strongly alkaline. NH3 is removed by aeration stripping for ammonia purification and recycling.

[0026] As Figure 2 shown, preferably, a device for strengthening the extraction of high carbon-nitrogen ratio fermentation broth from organic waste is used for the implementation of the above method for strengthening the extraction of high carbon-nitrogen ratio fermentation broth from organic waste, including a chelating fiber activation and elution module, an anaerobic fermentation module, an organic waste dehydration module, a reactor module, a chelating fiber separation module, a detection module, and a control module. The chelating fiber activation and elution module, the anaerobic fermentation module, the organic waste dehydration module, the reactor module, the chelating fiber separation module, and the detection module are respectively electrically connected to the control module; The chelating fiber activation and elution module includes a first reactor 1, a first stirring device 3, an activation liquid storage tank 4, an activation liquid delivery pump 5, an eluent delivery pump 30, and an eluent storage tank 31. The activation liquid storage tank 4 is connected to the activation liquid inlet and outlet 34 of the first reactor 1 through the activation liquid delivery pump 5. The eluent storage tank 31 is connected to the eluent inlet and outlet 32 of the first reactor 1 through the eluent delivery pump 30. The first stirring device 3 is arranged inside the first reactor 1. A chelating fiber feeding port 2 is arranged at the top of the first reactor 1. The chelating fiber feeding port 2 is used for feeding carboxyl chelating fiber. After pretreatment activation, the active carboxyl chelating fiber is obtained. A chelating fiber extraction port 6 and an eluent discharge port 33 are arranged at the bottom of the first reactor 1. A filter screen for the eluent discharge port is arranged inside the eluent discharge port 33; The anaerobic fermentation module includes an anaerobic fermentation tank 7, a second stirring device 10, and a temperature regulating device 11. The second stirring device 10 and the temperature regulating device 11 are arranged inside the anaerobic fermentation tank 7. An organic waste feeding port 8 is arranged at the bottom of the anaerobic fermentation tank 7, and an organic waste discharging port 9 is arranged on the upper side of the anaerobic fermentation tank 7. The organic waste discharging port 9 is connected to a mechanical dehydrator 12 of the organic waste dehydration module; The reactor module includes a second reactor 13, a first feed pump 17, a third stirring device 20, and a temperature monitoring and control device 21. A sodium ethylenediaminetetraacetate feeding port 14, an acidic regulating port 15, an organic waste fermentation liquid feeding port 18, and a live carboxyl chelating fiber feeding port 19 are arranged at the top of the second reactor 13. The mechanical dehydrator 12 is connected to the organic waste fermentation liquid feeding port 18 through the first feed pump 17. The chelating fiber extraction port 6 is connected to the live carboxyl chelating fiber feeding port 19. The third stirring device 20 and the temperature monitoring and control device 21 are arranged inside the second reactor 13. A first material discharging port 22 is arranged at the bottom of the second reactor 13; The chelating fiber separation module includes a chelating fiber separation tank 23, a second feed pump 24, and a chelating fiber separation tank filter screen 26. A chelating fiber separation tank feeding port 25 is arranged at the top of the chelating fiber separation tank 23. The chelating fiber separation tank filter screen 26 is arranged below the chelating fiber separation tank feeding port 25. The first material discharging port 22 is connected to the chelating fiber separation tank feeding port 25 through the second feed pump 24. A second material discharging port 27 is arranged at the bottom of the chelating fiber separation tank 23. The live carboxyl chelating fiber adsorbing ammonia nitrogen separated by the chelating fiber separation tank filter screen 26 is put into the chelating fiber feeding port 2 for ammonia nitrogen release treatment; The detection module includes a carbon-nitrogen detector 28, an ammonia-nitrogen detector 29, and a pH detection device 16. The carbon-nitrogen detector 28 is used to detect the C:N value of the fermentation liquid E discharged from the second material discharging port 27. The ammonia-nitrogen detector 29 is used to detect the ammonia nitrogen chelating ability of the live carboxyl chelating fiber after the release liquid treatment in the first reactor 1. The pH detection device 16 is used to detect the pH value of the organic waste fermentation liquid B in the second reactor 13.

[0027] As Figure 2 shown, preferably, the release liquid inlet / outlet 32 is arranged on the lower side of the first reactor 1, and the activation liquid inlet / outlet 34 is arranged on the upper side of the first reactor 1.

[0028] Preferably, the first reactor 1 is a cylindrical reactor with R:H = 1:1, the second reactor 13 is a cylindrical reactor with R:H = 3:1 to 1:3, the chelating fiber separation tank 23 is a cube separation tank with L:B:H = 1:1:1, and the pore size of the chelating fiber separation tank filter screen 26 is <1 mm.

[0029] Example 1 As Figure 1 、2 As shown in the figure, the present application discloses a method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio, which specifically includes the following steps: Step 1: Add carboxylated chelating fiber into the first reactor 1 (R:H = 1:1) from the chelating fiber feeding port 2. Use the activated liquid delivery pump 5 to transport the 1 mol / L sodium hydroxide solution from the activated liquid storage tank 4 to the first reactor 1 and add it from the activated liquid inlet and outlet 34. Stir at a speed of 100 - 300 rpm using the first stirring device 3 to perform activation pretreatment on the carboxylated chelating fiber. Then, take out the activated carboxylated chelating fiber from the chelating fiber extraction port 6 to obtain the active carboxylated chelating fiber. The average diameter of the carboxylated chelating fiber used is ≥2 mm, the functional group is carboxyl, and the ion chelating ability is ≥1.0 mmole - / g; The 1 mol / L sodium hydroxide solution used as the activated liquid can be reused 5 - 30 times; Step 2: Add organic waste into the anaerobic fermentation tank 7 from the organic waste feeding port 8. Use the temperature regulating device 11 to control the temperature at 30 - 60 o °C, use the second stirring device 10 to control the stirring speed at 50 - 200 rpm, and perform anaerobic fermentation for 3 - 10 days to convert organic nitrogen into ammonia nitrogen, obtaining the fermented waste A after anaerobic fermentation treatment. The organic waste after anaerobic fermentation is discharged from the organic waste discharge port 9; Step 3: Dehydrate the organic waste after anaerobic fermentation treatment using a mechanical dehydrator 12 to obtain a dehydrated filtrate, which is the organic waste fermentation broth B. The ammonia nitrogen in the organic waste fermentation broth B should account for 70% of the total nitrogen. The above-mentioned organic waste is one or two of sludge, organic garbage, and kitchen waste; Step 4: Use the first feed pump 17 to put the organic waste fermentation broth B into the second reactor 13 from the organic waste fermentation broth feeding port 18, and put 1 - 10 g / L of sodium ethylenediaminetetraacetate from the sodium ethylenediaminetetraacetate feeding port 14 to convert the polyvalent metal ions in the organic waste fermentation broth B into a chelated form. The total content of ionic polyvalent metals should be ≤0.5 mmol / L to avoid affecting the treatment effect of the subsequent active carboxylated chelating fiber; Step 5: Add 1 mol / L hydrochloric acid solution to the organic waste fermentation broth B from the acidic conditioning port 15 to adjust the organic waste fermentation broth B to an acidic condition. Use the pH detection device 16 to detect the pH at 5.5 - 7.0 to promote the conversion of ammonia nitrogen in the organic waste fermentation broth B from the molecular state to the ionic state, obtaining the organic waste fermentation broth C after pH adjustment. At this time, the ionic ammonia nitrogen should account for more than 80% of the total ammonia nitrogen; Step 6: Put the live carboxyl chelating fiber into the second reactor 13 from the live chelating fiber feeding port 19. The dosage of the live carboxyl chelating fiber is 40 - 60 g / L to obtain a mixture D of the live carboxyl chelating fiber and the organic waste fermentation broth. Step 7: Stir the mixture D with the third stirring device 20 for 7 - 10 hours, control the stirring speed at 100 - 200 rpm, and control the reaction temperature at 15 - 35 o °C (medium and low temperature operation); Step 8: Discharge the mixture D from the first material discharge port 22, and then use the second feed pump 24 to put the mixture D into the chelating fiber separation tank 23 (L:B:H = 1:1:1) from the chelating fiber separation tank feeding port 25. Use the chelating fiber separation tank filter screen 26 (pore size < 1 mm) to separate the live carboxyl chelating fiber and the organic waste fermentation broth in the mixture D. After separation, the live carboxyl chelating fiber is retained on the chelating fiber separation tank filter screen 26 for easy recovery, and the fermentation broth percolates into the bottom of the chelating fiber separation tank 23 under the filter screen to obtain the separated organic waste fermentation broth E, which is discharged from the second material discharge port 27. At the same time, recover the separated live carboxyl chelating fiber. Step 9: Use the carbon-nitrogen detector 28 to detect the C:N value of the organic waste fermentation broth E. If C:N > 13:1, recover the organic waste fermentation broth D for use as a high-quality carbon source liquid. If C:N ≤ 13:1, repeat steps S4 - S8 until C:N > 13:1. Step 10: Put the separated and recovered live carboxyl chelating fiber into the first reactor 1 from the chelating fiber feeding port 2. Use the stripping solution delivery pump 30 to transport 1 mol / L sodium hydroxide stripping solution with a volume 3 - 5 times that of the live carboxyl chelating fiber from the stripping solution storage tank 31 to the first reactor 1. Use the 1 mol / L sodium hydroxide stripping solution to carry out ammonia nitrogen stripping treatment on the live carboxyl chelating fiber for 1 - 3 hours. Control the stirring speed at 100 - 200 rpm with the first stirring device 3. Then use the stripping solution delivery pump 30 to discharge the sodium hydroxide stripping solution from the stripping solution inlet and outlet 32 to the stripping solution storage tank 31, while the live carboxyl chelating fiber is intercepted, separated, and recovered through the filter screen (pore size < 1 mm) of the stripping solution discharge port 33. Use the ammonia nitrogen detector 29 to detect the NH4 + chelating ability of the live carboxyl chelating fiber after stripping solution treatment. If the reduction of NH4 + chelating ability ≤ 50%, then reuse the chelating fiber. If the reduction of NH4 + chelating ability > 50%, then replace with new chelating fiber for this method. Use the ammonia nitrogen detector 29 to detect the NH4 + content of the sodium hydroxide stripping solution. If NH4 +If the content ≤ 0.5 mol / L, the stripping solution can be reused. If the NH4 + content > 0.5 mol / L, it is considered that the sodium hydroxide stripping solution has failed, and the sodium hydroxide stripping solution is updated for this method; at this time, the failed sodium hydroxide stripping solution is rich in a large amount of NH4 + and is strongly alkaline, and ammonia can be stripped by aeration to achieve ammonia enrichment and ammonia recovery.

[0030] Example 2 In this application, carboxyl chelating fiber is used to strengthen the fermentation of excess sludge to extract high-carbon-nitrogen ratio fermentation broth and ammonia enrichment and recovery. The average diameter of the carboxyl chelating fiber is 2 mm, and the functional group is carboxyl; the carboxyl chelating fiber is added into the first reactor (R = 0.1 m, H = 0.1 m), and 1 mol / L sodium hydroxide solution is transported from the activating solution storage tank to the first reactor by the activating solution delivery pump. The volume of the NaOH solution is 3 L, and the carboxyl chelating fiber is activated for 1 hour to obtain the activated carboxyl chelating fiber.

[0031] 5 L of sludge is added into the anaerobic fermentation tank and anaerobically fermented for 4 days at 35 o °C. During this process, the stirring speed is maintained at 150 rpm to convert organic nitrogen into ammonia nitrogen, and the sludge A after anaerobic fermentation treatment is obtained. The sludge A after anaerobic fermentation treatment is mechanically dehydrated by a centrifuge to obtain a dehydration filtrate, which is the sludge fermentation broth B.

[0032] Take 3 L of sludge fermentation broth B and add it into a reactor (R = 0.5 m, H = 0.5 m), and add sodium ethylenediaminetetraacetate at 3 g / L to convert the polyvalent metal ions in the sludge fermentation broth B into a chelated form. After detection, the content of ionic polyvalent metals is reduced from 0.9 mmol / L to 0.2 mmol / L (as shown in Table 1). Then, 1 mol / L HCl solution is added to the sludge fermentation broth B from the acidic adjustment port to adjust the fermentation broth B to an acidic condition. The pH is detected by a pH detection device and reduced from 7.3 to 6.4 (as shown in Table 1), promoting the conversion of ammonia nitrogen in the sludge fermentation broth B from the molecular state to the ionic state, and obtaining the sludge fermentation broth C after pH adjustment. At this time, the ratio of ionic ammonia nitrogen to the total ammonia nitrogen increases from 68.9% to 83.7% (as shown in Table 1). 90 g of activated chelating fiber is put into the reactor, and the dosage is 30 g / L, obtaining a mixture D of activated chelating fiber and sludge fermentation broth. The mixture D is stirred for 4 hours by a stirring device, and the stirring speed is controlled at 200 rpm. The reaction temperature is controlled at 30 oC (medium-temperature operation). After the reaction, the treated mixture D is discharged into the chelating fiber separation tank (L = 0.15 m, B = 0.15 m, H = 0.15 m) by using the second feed pump. The living carboxyl chelating fiber and the sludge fermentation broth in the mixture D are separated by using a filter screen (pore size 0.25 mm, 60 meshes), and the separated sludge fermentation broth E is discharged from the discharge port. The C:N value of the sludge fermentation broth E is detected, and it is found that the C:N of the sludge fermentation broth E treated by the method of the present application is 17.2:1, which can be used as a high-quality carbon source liquid.

[0033] The C:N of the sludge fermentation broth in control group 1 is only 6.2:1, and the C:N of the sludge fermentation broth in control group 2 is only 10.1:1 (as shown in Table 1). The removal rate of ammonia nitrogen in the sludge fermentation broth by the method of the present application is 63.98%, and the separation and removal effect of ammonia nitrogen is obvious. While the removal rate of ammonia nitrogen by using biochar without the steps of the present application is only 38.61%, which is lower than the method of the present application (as shown in Table 1).

[0034] Subsequently, the recovered carboxyl chelating fiber is put into the first reactor (R = 0.1 m, H = 0.1 m). 1 mol / L sodium hydroxide eluent is transported from the eluent storage tank to the first reactor by using the eluent delivery pump, and it is treated for 2 hours. The volume of the sodium hydroxide eluent is 3 L. The stirring speed is controlled at 200 rpm by the fourth stirring device. Then the eluent is discharged from the discharge port to the eluent storage tank, and the carboxyl chelating fiber is intercepted, separated and recovered through the filter screen (pore size 0.25 mm, that is, 60 meshes) at the discharge port. The NH4 + chelating capacity of the chelating fiber is 0.85 mmole - / g (as shown in Table 1), a decrease of <50%, and it can be reused. The NH4 + content of the eluent is detected to be 459.17 mg / L (<1 mol / L) (as shown in Table 1), and it can be reused. Subsequently, under the condition of repeated use of the carboxyl chelating fiber and the eluent, the sludge fermentation broth is treated by using the carboxyl chelating fiber, and the operating parameters are the same as above. The C:N of the treated sludge fermentation broth B is 16.1:1, and the removal rate of ammonia nitrogen in the sludge fermentation broth is 61.25% (as shown in Table 2). The carboxyl chelating fiber is treated by using the above-mentioned eluent for repeated use, and the NH4 + chelating capacity of the chelating fiber is detected to be 0.83 mmole - / g (as shown in Table 2), a decrease of <50%, and it can be reused. The NH4 +The content is 838.36 mg / L (<1 mol / L) (as shown in Table 2), and it can be reused, indicating that the carboxyl chelating fiber and the desorption solution can be reused to achieve ammonia nitrogen enrichment. That is, while the method of this application separates and removes ammonia nitrogen from the sludge fermentation broth, ammonia nitrogen can be continuously desorbed and accumulated and enriched in the regeneration solution, increasing the ammonia nitrogen concentration in the regeneration solution, which is beneficial to the subsequent recovery of ammonia nitrogen from the regeneration solution.

[0035] Control group 1 It refers to the case where no carboxyl chelating fiber is added, the acidic fermentation broth is not adjusted, and the remaining treatment methods are the same as those in Example 2.

[0036] Control group 2 It refers to the case where no carboxyl chelating fiber is added, the acidic fermentation broth is not adjusted, and biochar is used to replace the carboxyl chelating fiber for adsorption, and the remaining treatment methods are the same as those in Example 2.

[0037] Table 1 Comparison of the effects of Example 2 and the control groups

[0038] Table 2 Comparison of the effects of Example 2 and the control groups

[0039] Example 3 The method of this example is basically the same as that of Example 1, except that: in step S5, the reaction temperature is controlled at 35 - 70 o °C (high-temperature operation). At this time, the stirring time in step S5 is 5 - 7 hours, and the dosage of the live chelating fiber in step S4 is 20 - 40 g / L.

[0040] Example 4 Carboxyl chelating fiber is used to strengthen the fermentation of food waste to extract high-carbon-nitrogen-ratio fermentation broth and ammonia enrichment and recovery. The average diameter of the fiber material is 2 mm, and the functional group is carboxyl. The carboxyl chelating fiber is added into the first reactor (R = 0.1 m, H = 0.1 m), and 1 mol / L sodium hydroxide solution is transported from the activation solution storage tank to the first reactor by the activation solution delivery pump. The volume of the NaOH solution is 3 L, and the carboxyl chelating fiber is activated for 1 hour to obtain the live carboxyl chelating fiber.

[0041] 5 L of food waste is added into the anaerobic fermentation tank and undergoes anaerobic fermentation for 6 days at 35 o °C. During this process, the stirring speed is maintained at 200 rpm to convert organic nitrogen into ammonia nitrogen, obtaining food waste A after anaerobic fermentation treatment. The food waste A after anaerobic fermentation treatment is mechanically dehydrated by a centrifugal dehydrator to obtain the dehydrated filtrate, which is the food waste fermentation broth B.

[0042] Take 3 L of food waste fermentation broth B and add it into the reactor (R = 0.5 m, H = 0.5 m). Add sodium ethylenediaminetetraacetate at a concentration of 5 g / L to convert the polyvalent metal ions in the food waste fermentation broth B into chelated forms. After detection, the content of ionic polyvalent metals at this time decreases from 0.3 mmol / L to 0.1 mmol / L (as shown in Table 3). Then, add 1 mol / L HCl solution to the food waste fermentation broth B through the acid adjustment port to adjust the fermentation broth B to an acidic condition. Use a pH detection device to detect that the pH decreases from 7.1 to 5.9 (as shown in Table 3), promoting the conversion of ammonia nitrogen in the food waste fermentation broth B from the molecular state to the ionic state, and obtaining the food waste fermentation broth C after pH adjustment. At this time, the proportion of ionic ammonia nitrogen to the total ammonia nitrogen increases from 73.5% to 87.1% (as shown in Table 3). Put 45 g of live chelating fiber into the reactor, with a dosage of 15 g / L, to obtain a mixture D of live chelating fiber and food waste fermentation broth. Use a stirring device to stir the mixture D for 3 hours, control the stirring speed at 250 rpm, and control the reaction temperature at 50 o °C (high-temperature operation). After the reaction, use the second feed pump to discharge the treated mixture D into the chelating fiber separation tank (L = 0.15 m, B = 0.15 m, H = 0.15 m). Use a filter screen (pore size 0.25 mm, 60 meshes) to separate the live carboxyl chelating fiber and the food waste fermentation broth in the mixture D, and obtain the separated food waste fermentation broth E and discharge it from the discharge port. Detect the C:N value of the food waste fermentation broth E and find that the C:N of the food waste fermentation broth E treated by the method of the present application is 21.7:1, which can be used as a high-quality carbon source solution. The C:N of the food waste fermentation broth in Control Group 3 is only 7.0:1, and the C:N of the food waste fermentation broth in Control Group 4 is only 11.7:1 (as shown in Table 3). The removal rate of ammonia nitrogen in the sludge fermentation broth by the method of the present application is 67.74%, and the separation and removal effect of ammonia nitrogen is obvious. While the removal rate of ammonia nitrogen by using biochar without going through the steps of the present application is only 40.17%, which is lower than the method of the present application (as shown in Table 3).

[0043] Subsequently, recycle the separated carboxyl chelating fiber. Put it into the first reactor (R = 0.1 m, H = 0.1 m). Use a stripping solution transfer pump to transfer 1 mol / L sodium hydroxide stripping solution from the stripping solution storage tank to the first reactor, and treat it for 2 hours. The volume of the sodium hydroxide stripping solution is 3 L. Control the stirring speed at 200 rpm by the fourth stirring device. Then discharge the stripping solution from the discharge port to the stripping solution storage tank. The carboxyl chelating fiber is intercepted and separated and recycled through the filter screen (pore size 0.25 mm, i.e., 60 meshes) at the discharge port. Detect the NH4 + chelating capacity of the chelating fiber is 0.9 mmole - / g (as shown in Table 3), a reduction of <50%, reusable, detecting the NH4 in the desorption solution + The content is 449.28 mg / L (<1 mol / L) (as shown in Table 3), reusable. Subsequently, under the condition of repeated use of carboxyl chelating fiber and desorption solution, the carboxyl chelating fiber was used to treat the fermentation broth of food waste, and the operating parameters were the same as above. After treatment, the C:N of sludge fermentation broth B was 19.6:1, and the ammonia nitrogen removal rate in the fermentation broth of food waste was 64.24% (as shown in Table 4). Using the above-mentioned desorption solution for repeated use to treat the carboxyl chelating fiber, detecting the NH4 of the chelating fiber + The chelating ability is 0.89 mmole - / g (as shown in Table 4), a reduction of <50%, reusable, detecting the NH4 in the desorption solution + The content is 808.31 mg / L (<1 mol / L) (as shown in Table 4), reusable, indicating that the repeated use of carboxyl chelating fiber and desorption solution can achieve ammonia nitrogen enrichment, that is, while separating and removing ammonia nitrogen from the fermentation broth of food waste by this method, ammonia nitrogen can be continuously desorbed and accumulated and enriched in the regeneration solution, increasing the ammonia nitrogen concentration in the regeneration solution, which is beneficial to the subsequent recovery of ammonia nitrogen from the regeneration solution.

[0044] Control group 3 It refers to not adding carboxyl chelating fiber and not adjusting the acidic fermentation broth, and the remaining treatment methods are the same as those in Example 4.

[0045] Control group 4 It refers to not adding carboxyl chelating fiber and not adjusting the acidic fermentation broth, and using biochar to replace carboxyl chelating fiber for adsorption, and the remaining treatment methods are the same as those in Example 4.

[0046] Table 3 Comparison of the effects of Example 4 and the control group

[0047] Table 4 Comparison of the effects of Example 4 and the control group

[0048] The principle of this application is as follows: Aiming at the limitation of the current low C:N of organic waste on carbon source recovery and the technical requirement of ammonia nitrogen separation and recovery, this application provides a device and method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio. Carboxyl groups are loaded on the surface of the fiber material to make carboxyl chelating fiber, and it is activated with NaOH solution. Then, the organic waste is anaerobically fermented to convert organic nitrogen into ammonia nitrogen. The organic waste is mechanically dehydrated to obtain the fermentation broth, which is more conducive to the separation and removal of ammonia nitrogen. Then, the pH of the fermentation broth is adjusted to acidic to convert molecular ammonia nitrogen into ionic ammonia nitrogen, which is beneficial to the separation and removal of ammonia nitrogen by carboxyl chelating fiber. The activated carboxyl chelating fiber is used to remove the ionic ammonia nitrogen (NH4 + ) in the organic waste fermentation broth, thereby increasing the C:N of the organic waste fermentation broth, effectively avoiding the limitation of ammonia nitrogen on the further utilization of the recovered fermentation broth, and realizing the extraction of a fermentation broth with a high carbon-nitrogen ratio from organic waste. The organic waste fermentation broth treated by chelating fiber has a high C:N, showing the characteristics of a high-concentration carbon source (volatile fatty acids) and a low-concentration nitrogen source (ammonia nitrogen), and it is a super-high-quality carbon source liquid, which can break through the bottleneck of the quality of traditional organic waste carbon source recovery. At the same time, after the carboxyl chelating fiber is used, the chelated and adsorbed NH4 + is desorbed with sodium hydroxide desorbing solution, so that it is desorbed and released into the sodium hydroxide desorbing solution. At this time, both the chelating fiber and the sodium hydroxide desorbing solution can be reused, and they can operate continuously for a long time. A large amount of NH4 + accumulates in the sodium hydroxide desorbing solution, realizing the separation and high-concentration enrichment of ammonia nitrogen, and the sodium hydroxide desorbing solution is strongly alkaline and can be collected by the aeration stripping method to realize the recovery and utilization of high-concentration ammonia.

[0049] The method of this application has the advantages of short treatment cycle, high ammonia nitrogen removal rate, high C:N of organic waste fermentation broth, easy recovery and recycling of carboxyl chelating fiber, high-concentration enrichment of ammonia nitrogen desorption and accumulation in NaOH solution for easy recovery, low drug consumption and energy consumption, and low treatment cost. Moreover, it will not leave exogenous substances in the organic waste and its fermentation broth, and there is no hidden danger of secondary environmental threat. The economic and environmental benefits are significantly better than traditional methods. During the operation of the method of this application, the C:N of the discharged material is monitored to evaluate the effect of ammonia nitrogen separation and removal, and the operation parameters such as the dosage of chelating fiber, treatment time, and treatment temperature are feedback-regulated to ensure the stable operation of the system.

[0050] This application discloses a method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio. Carboxyl groups are loaded on the surface of the fiber material to make carboxyl chelating fiber, and it is applied to the process of organic waste treatment. The active carboxyl chelating fiber chelates and adsorbs ammonia nitrogen on the carboxyl surface, realizing the separation and removal of ammonia nitrogen in the organic waste fermentation broth, extracting a fermentation broth with a high C:N as a carbon source liquid, and improving the quality of carbon source recovery. At the same time, the ammonia nitrogen in the carboxyl chelating fiber is desorbed to realize the enrichment of ammonia nitrogen, which is beneficial to the recovery and utilization of ammonia nitrogen.

[0051] In the method of the present application, organic waste is first anaerobically fermented to convert the organic nitrogen in the organic waste into ammonia nitrogen. After mechanical dehydration, the fermentation broth is obtained, and the fermentation broth is adjusted to an acidic condition to convert molecular ammonia nitrogen into ionic ammonia nitrogen, which is beneficial to the separation and removal of ammonia nitrogen by carboxyl chelating fiber.

[0052] Before removing ammonia nitrogen, the present application uses sodium ethylenediaminetetraacetate to convert the polyvalent metal ions in the organic waste fermentation broth B into a chelated form, avoiding affecting the treatment effect of the subsequent active carboxyl chelating fiber and improving the removal effect of the active carboxyl chelating fiber on ammonia nitrogen.

[0053] After use, the carboxyl chelating fiber of the present application can be regenerated with a sodium hydroxide regeneration solution and can be reused after regeneration, realizing the long-term recycling of the carboxyl chelating fiber and reducing the cost; the carboxyl chelating fiber can be quickly separated and recovered, leaving no drug residues in the sludge and fermentation broth, not affecting the subsequent utilization of the fermentation broth, and posing no environmental threat, solving the disadvantages of traditional methods such as alkali adjustment - stripping and struvite precipitation that require the addition of alkali agents, Mg 2+ , PO4 2- and other drugs, and the drug residues caused by the inability to separate and recover affect the subsequent utilization of the fermentation broth.

[0054] During the regeneration and reuse process of the carboxyl chelating fiber of the present application, the sodium hydroxide regeneration solution can also be reused, not only further reducing the treatment cost, but also enabling the large-scale enrichment of ammonia nitrogen desorption, increasing the ammonia nitrogen concentration. At this time, the strong alkalinity of the sodium hydroxide regeneration solution can achieve the recycling and utilization of high-concentration ammonia during the aeration stripping process, providing an additional benefit of economically convenient ammonia nitrogen recovery with relatively high concentration and purity.

[0055] The removal rate of ammonia nitrogen in the organic waste fermentation broth of the present application exceeds 70%, and the obtained fermentation broth C:N > 13:1, improving the bioavailability of the carbon source in the fermentation broth. It belongs to a super-high-quality carbon source, meets the requirements of current engineering practice, and has obvious advantages compared with similar products.

[0056] In summary, the device and method of the present application can separate and remove ammonia nitrogen from organic waste at low cost, improve the fermentation broth C:N and the quality of the carbon source, obtain a fermentation broth with a high carbon-nitrogen ratio, and at the same time enrich and recover the removed ammonia nitrogen at a high concentration, solving the problems of low C:N in the extraction of carbon source, ammonia nitrogen restricting the quality of the carbon source, and ammonia nitrogen waste during the current resource utilization process of organic waste. Moreover, the chelating fiber has the advantage of recycling, with excellent economic and environmental benefits.

[0057] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present application.

[0058] Many other changes and modifications can be made without departing from the spirit and scope of the present application. It should be understood that the present application is not limited to the specific embodiments, and the scope of the present application is defined by the appended claims.

Claims

1. A method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio, characterized in that: It includes the following steps: Step 1: Pretreat and activate the carboxyl chelating fiber with an activation solution to obtain an activated carboxyl chelating fiber; Step 2: Anaerobically ferment the organic waste at 30 - 60 o °C for 3 - 10 days with a stirring speed of 50 - 200 rpm, convert the large-molecule complex organic substances in the organic waste into small-molecule carbon source substances, and convert the organic nitrogen into ammonia nitrogen to obtain the fermented waste A after anaerobic fermentation treatment; Step 3: Mechanically dehydrate the fermented waste A after anaerobic fermentation treatment to obtain a dehydrated filtrate, i.e., the organic waste fermentation liquid B; Step 4: Add 1 - 10 g / L of sodium ethylenediaminetetraacetate to the organic waste fermentation liquid B to convert the polyvalent metal ions in the organic waste fermentation liquid B into a chelated form; Step 5: Adjust the organic waste fermentation liquid B to an acidic condition with a pH of 5.5 - 7.0 to promote the conversion of ammonia nitrogen in the organic waste fermentation liquid B from the molecular state to the ionic state, obtaining the adjusted - pH organic waste fermentation liquid C; Step 6: Add the activated carboxyl chelating fiber from Step 1 into the organic waste fermentation liquid C at a dosage of 20 - 60 g / L to obtain a mixture D of the activated carboxyl chelating fiber and the organic waste fermentation liquid C; Step 7: Stir the mixture D for 5 to 10 hours, control the stirring speed at 100 to 300 rpm, and control the reaction temperature at 15 to 70 o °C; Step 8: Use a filter screen to perform solid - liquid separation on the mixture D to obtain the separated fermentation liquid E, and recover the activated carboxyl chelating fiber that adsorbs ammonia nitrogen; Step 9: Detect the C:N value of the fermentation liquid E. If C:N > 13:1, then recover the fermentation liquid E for use as a high - quality carbon source liquid; if C:N ≤ 13:1, then repeat Steps 4 - 8 until C:N > 13:1; Step 10: Perform ammonia nitrogen desorption treatment on the activated carboxyl chelating fiber that adsorbs ammonia nitrogen with a desorption solution, and the activated carboxyl chelating fiber after desorption treatment is reused.

2. The method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio according to claim 1, wherein: In step 1, the average diameter of the carboxyl chelating fiber is ≥2 mm, the functional group of the carboxyl chelating fiber is carboxyl, the activation solution is 1 mol / L sodium hydroxide solution, and the ion chelating ability of the carboxyl chelating fiber after pretreatment with the activation solution is ≥1.0 mmole - / g.

3. A method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio according to claim 1, characterized in that: In Step 2, the organic waste includes one or more of sludge, organic garbage, and kitchen waste. In Step 3, the ammonia nitrogen in the organic waste fermentation liquid B accounts for more than 70% of the total nitrogen.

4. A method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio according to claim 1, characterized in that: After adding sodium ethylenediaminetetraacetate in Step 4, the total content of ionic polyvalent metals in the organic waste fermentation liquid B ≤ 0.5 mmol / L, so as not to interfere with the adsorption of ammonia nitrogen by the activated carboxyl chelating fiber in Steps 6 and 7.

5. A method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio according to claim 1, characterized in that: After adjusting the pH of the organic waste fermentation liquid B to acidic in Step 5, the ionic ammonia nitrogen accounts for more than 80% of the total ammonia nitrogen.

6. The method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio according to claim 1, wherein: In step 7, when the reaction temperature is 15~35 o °C, the dosage of the active carboxyl chelating fiber in step 6 is 40~60 g / L, and the stirring time is 7~10 hours; in step 7, when the reaction temperature is 35~70 o °C, the dosage of the active carboxyl chelating fiber in step 6 is 20~40 g / L, and the stirring time is 5~7 hours.

7. A method for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio according to claim 1, characterized in that: In Step 10, the desorption solution is a 1 mol / L sodium hydroxide desorption solution. The volume of the desorption solution is 3 - 5 times the volume of the activated carboxyl chelating fiber that adsorbs ammonia nitrogen. The desorption treatment time is 1 - 3 hours, and the stirring speed is controlled at 100 - 200 rpm; The desorption solution can be reused 5 - 20 times. When the ammonia nitrogen content of the desorption solution > 0.5 mol / L, the desorption solution fails and needs to be replaced; The failed desorption solution is rich in a large amount of ammonia nitrogen and is strongly alkaline. NH3 is removed by aeration stripping for ammonia purification and recycling.

8. An apparatus for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio, characterized in that: For the implementation of the method for intensifying the fermentation of organic waste to extract a high - carbon - nitrogen - ratio fermentation liquid according to any one of Claims 1 - 7, it includes a chelating fiber activation and desorption module, an anaerobic fermentation module, an organic waste dehydration module, a reactor module, a chelating fiber separation module, a detection module, and a control module. The chelating fiber activation and desorption module, the anaerobic fermentation module, the organic waste dehydration module, the reactor module, the chelating fiber separation module, and the detection module are respectively electrically connected to the control module; The chelating fiber activation and release module includes a first reactor (1), a first stirring device (3), an activation liquid storage tank (4), an activation liquid delivery pump (5), a release liquid delivery pump (30), and a release liquid storage tank (31). The activation liquid storage tank (4) is connected to the activation liquid inlet / outlet (34) of the first reactor (1) through the activation liquid delivery pump (5). The release liquid storage tank (31) is connected to the release liquid inlet / outlet (32) of the first reactor (1) through the release liquid delivery pump (30). A first stirring device (3) is arranged inside the first reactor (1). A chelating fiber feeding port (2) is arranged at the top of the first reactor (1), and the chelating fiber feeding port (2) is used for feeding carboxyl chelating fiber. After pretreatment activation, the carboxyl chelating fiber is obtained as the active carboxyl chelating fiber. A chelating fiber extraction port (6) and a release liquid discharge port (33) are arranged at the bottom of the first reactor (1). A release liquid discharge port filter screen is arranged inside the release liquid discharge port (33); The anaerobic fermentation module includes an anaerobic fermentation tank (7), a second stirring device (10), and a temperature regulation device (11). A second stirring device (10) and a temperature regulation device (11) are arranged inside the anaerobic fermentation tank (7). An organic waste feeding port (8) is arranged at the bottom of the anaerobic fermentation tank (7). An organic waste discharge port (9) is arranged on the upper side of the anaerobic fermentation tank (7), and the organic waste discharge port (9) is connected to a mechanical dehydrator (12) of the organic waste dehydration module; The reactor module includes a second reactor (13), a first feed pump (17), a third stirring device (20), and a temperature monitoring and control device (21). A sodium ethylenediaminetetraacetate feeding port (14), an acidity regulation port (15), an organic waste fermentation liquid feeding port (18), and an active chelating fiber feeding port (19) are arranged at the top of the second reactor (13). The mechanical dehydrator (12) is connected to the organic waste fermentation liquid feeding port (18) through the first feed pump (17). The chelating fiber extraction port (6) is connected to the active chelating fiber feeding port (19). A third stirring device (20) and a temperature monitoring and control device (21) are arranged inside the second reactor (13). A first material discharge port (22) is arranged at the bottom of the second reactor (13); The chelating fiber separation module includes a chelating fiber separation tank (23), a second feed pump (24), and a chelating fiber separation tank filter screen (26). A chelating fiber separation tank feed port (25) is arranged at the top of the chelating fiber separation tank (23), and the chelating fiber separation tank filter screen (26) is arranged below the chelating fiber separation tank feed port (25). The first material discharge port (22) is connected to the chelating fiber separation tank feed port (25) through the second feed pump (24). A second material discharge port (27) is arranged at the bottom of the chelating fiber separation tank (23). The active carboxyl chelating fiber adsorbing ammonia nitrogen separated by the chelating fiber separation tank filter screen (26) is fed into the chelating fiber feeding port (2) for ammonia nitrogen release treatment; The detection module includes a carbon-nitrogen detector (28), an ammonia-nitrogen detector (29), and a pH detection device (16). The carbon-nitrogen detector (28) is used to detect the C:N value of the fermentation broth E discharged from the second material discharge port (27). The ammonia-nitrogen detector (29) is used to detect the ammonia-nitrogen chelating ability of the activated carboxyl chelating fiber after the treatment of the liberation liquid in the first reactor (1). The pH detection device (16) is used to detect the pH value of the organic waste fermentation broth B in the second reactor (13).

9. The device for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio according to claim 8, characterized in that: The liberation liquid inlet and outlet (32) is arranged on the lower side of the first reactor (1), and the activation liquid inlet and outlet (34) is arranged on the upper side of the first reactor (1).

10. The device for enhancing the fermentation of organic waste to extract a fermentation broth with a high carbon-nitrogen ratio according to claim 8, characterized in that: The first reactor (1) is a cylindrical reactor with R:H = 1:

1. The second reactor (13) is a cylindrical reactor with R:H = 3:1 to 1:

3. The chelating fiber separation tank (23) is a cube separation tank with L:B:H = 1:1:

1. The pore diameter of the chelating fiber separation tank filter screen (26) is <1 mm.

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