Biomass energy comprehensive utilization system and method

Abstract

The biomass energy comprehensive utilization system is characterized in that microorganisms in a first anaerobic reactor decompose organic matters in wastewater to generate biogas; ammonia nitrogen and nitrite nitrogen are converted into nitrogen in the first anaerobic ammonia oxidation reactor; solid particles in the wastewater are separated by the water separator; organic matters in the wastewater are decomposed into biogas in the second anaerobic reactor; magnesium ions, phosphate and ammonium ions in the struvite reaction tower react to generate struvite; ammonia nitrogen and nitrite nitrogen are converted into nitrogen in the second anaerobic ammonia oxidation reactor; denitrifying bacteria in the anoxic tank degrade nitrate by using organic matters in the wastewater to generate nitrogen; ammonia nitrogen in the aerobic tank is converted into nitrate, part of the nitrate-containing wastewater flows back to the anoxic tank, and the remaining part of the nitrate-containing wastewater is conveyed to a primary sedimentation tank; activated sludge in the wastewater is separated out through precipitation, one part of the wastewater flows back to the anoxic tank, and the remaining activated sludge is discharged to a sludge dewatering workshop; and adding a flocculating agent into the phosphorus-containing wastewater, and precipitating phosphorus in the secondary sedimentation tank.

Description

Technical Field

[0001] This invention relates to the field of biomass energy utilization technology, and specifically to a comprehensive biomass energy utilization system and method. Background Technology

[0002] Livestock farms generate large amounts of animal manure and wastewater, which contain significant amounts of organic matter, nitrogen, and phosphorus. Direct discharge of these substances pollutes the environment. Therefore, it is necessary to treat the animal manure and wastewater to separate the organic matter, nitrogen, and phosphorus before discharging the waste, thus reducing environmental pollution. Furthermore, the separated organic matter, nitrogen, and phosphorus can be reused. Therefore, a system is needed to treat animal manure and wastewater, effectively separating the organic matter, nitrogen, and phosphorus from it. Summary of the Invention

[0003] The purpose of this invention is to provide a biomass energy comprehensive utilization system that removes nitrogen and phosphorus from wastewater through multiple stages, thereby achieving wastewater purification.

[0004] On the one hand, a comprehensive biomass energy utilization system is provided, including: In the first anaerobic reactor, microorganisms decompose organic matter in wastewater to generate biogas, which is then stored in a biogas storage tank. In the first anaerobic ammonia oxidation reactor, anaerobic ammonia oxidizing bacteria convert ammonia nitrogen and nitrite nitrogen into nitrogen gas and discharge it, while the wastewater is transported to the anoxic tank. Sand separators are used to separate solid particles from wastewater. In the second anaerobic reactor, microorganisms decompose organic matter in wastewater to generate biogas, which is then stored in a biogas storage tank. The struvite reaction tower reacts magnesium ions, phosphate, and ammonium ions to form struvite, thereby removing phosphate and ammonium ions from wastewater. In the second anaerobic ammonia oxidation reactor, anaerobic ammonia oxidizing bacteria convert ammonia nitrogen and nitrite nitrogen in the wastewater into nitrogen gas and discharge it. Then the wastewater is transported to the anoxic tank. Anoxic tank, in which denitrifying bacteria utilize organic matter in wastewater to degrade nitrates and produce nitrogen gas; In the aerobic tank, ammonia nitrogen is converted into nitrate. Then, part of the wastewater containing nitrate is returned to the anoxic tank, and the remainder is transported to the primary sedimentation tank. The primary sedimentation tank separates the activated sludge from the wastewater through sedimentation. Part of the separated activated sludge is returned to the anoxic tank to maintain the bacterial concentration, while the remaining activated sludge is discharged to the sludge dewatering workshop. A secondary sedimentation tank is used to add flocculants to phosphorus-containing wastewater, causing phosphorus to precipitate within the secondary sedimentation tank. The sulfur-based solid-state denitrification reactor reduces nitrate nitrogen to nitrogen gas through denitrification by autotrophic microorganisms. This process removes large amounts of nitrogen and phosphorus from industrial wastewater and animal excrement before discharge, thereby reducing environmental pollution.

[0005] On the other hand, a method for comprehensive utilization of biomass energy is provided, applicable to the aforementioned comprehensive utilization system of biomass energy, comprising the following steps: Step 1: The wastewater to be treated is transported to the first anaerobic reactor. In the first anaerobic reactor, microorganisms decompose the organic matter in the wastewater to generate biogas, which is then stored in a biogas storage tank. Step 2: The biogas in the biogas storage tank is transported to the desulfurization equipment, which desulfurizes the biogas to produce elemental sulfur. The desulfurized biogas is then transported to the biogas purification equipment for purification to obtain biogas with a high methane content. Step 3: In the first anaerobic ammonia oxidation reactor, anaerobic ammonia oxidizing bacteria convert ammonia nitrogen and nitrite nitrogen into nitrogen gas, and the wastewater is transported to the anoxic tank. Step 4: After the animal manure is mixed evenly in the homogenizing tank, it is transported to the sand-water separator, which separates the solid particles in the wastewater. Step 5: Microorganisms decompose the organic matter in the wastewater to generate biogas in the second anaerobic reactor. The biogas is stored in a biogas storage tank, and the wastewater is transported to the struvite reaction tower. Step 6: Inside the struvite reaction tower, magnesium ions, phosphate ions, and ammonium ions in the wastewater react to form struvite, thereby removing phosphate ions and ammonium ions from the wastewater. Step 7: In the second anaerobic ammonia oxidation reactor, anaerobic ammonia oxidizing bacteria convert ammonia nitrogen and nitrite nitrogen in the wastewater into nitrogen gas and discharge it. Then the wastewater is transported to the anoxic tank. Step 8: In the anoxic tank, denitrifying bacteria use the organic matter in the wastewater to degrade nitrates and produce nitrogen gas. The wastewater is then sent to the aerobic tank. Step 9: Ammonia nitrogen is converted into nitrate in the aerobic tank. Then, part of the wastewater containing nitrate is returned to the anoxic tank, and the remaining part is transported to the primary sedimentation tank. Step 10: Separate the activated sludge from the wastewater through sedimentation in the primary sedimentation tank. Part of the separated activated sludge is returned to the anoxic tank to maintain the bacterial concentration, and the remaining activated sludge is discharged to the sludge dewatering workshop. Step 11: In the secondary sedimentation tank, a flocculant is added to the phosphorus-containing solution, and the phosphorus precipitates in the secondary sedimentation tank; In the sulfur-based solid-state denitrification reactor, denitrification by autotrophic microorganisms reduces nitrate nitrogen to nitrogen gas.

[0006] The advantages of this invention are as follows: For wastewater discharged from the sewage treatment plant, the first anaerobic reactor treats the organic matter in the wastewater to produce biogas, achieving the recovery and utilization of organic matter from the wastewater. A desulfurization device is used to desulfurize the biogas, and the generated elemental sulfur is used as packing material in the sulfur-based solid-phase antinitrification reactor to remove nitrogen from the wastewater, achieving sulfur recovery and utilization while purifying the biogas. In the first anaerobic ammonia oxidation reactor, ammonia nitrogen and nitrite nitrogen in the wastewater are converted into nitrogen gas, removing nitrogen from the wastewater.

[0007] Animal manure discharged from farms is high in phosphorus and nitrogen. It is first treated in a homogenizing tank, then separated from particulate matter using a sand-water separator. The organic matter in the wastewater is treated in the second anaerobic reactor, generating biogas and achieving organic matter recycling. Magnesium ions are added to the struvite reaction tower, where they react with phosphate and ammonium ions in the wastewater to form struvite, removing large amounts of phosphorus and nitrogen from the wastewater. In the second anaerobic ammonia oxidation reactor, ammonia nitrogen and nitrite nitrogen in the wastewater are converted into nitrogen gas, removing nitrogen from the wastewater.

[0008] In the anoxic tank, denitrifying bacteria utilize organic matter in the wastewater to degrade nitrates, producing nitrogen gas and thus removing nitrogen from the wastewater while simultaneously removing organic matter. In the aerobic tank, ammonia nitrogen is converted into nitrate nitrogen, providing "raw material" for denitrification in the anoxic tank. In the secondary sedimentation tank, the flocculants produced by the reaction are precipitated and discharged. In a sulfur-based solid-state denitrification reactor, nitrate nitrogen is reduced to nitrogen gas, further removing nitrogen from the wastewater.

[0009] Through the above steps, organic matter and elemental sulfur in wastewater can be recycled and utilized. Phosphorus and nitrogen in wastewater can be removed through multiple reactions, and the wastewater can be purified before being discharged, reducing environmental pollution. Attached Figure Description

[0010] Figure 1 This is a logic block diagram of the biomass energy comprehensive utilization system in this embodiment; Figure 2 This is a schematic diagram of the anoxic tank and the aerobic tank in this embodiment; Figure 3 This is a top view of the secondary sedimentation tank in this embodiment; Figure 4 This is a side view of the secondary sedimentation tank in this embodiment; Figure 5 This is an appendix to this embodiment. Figure 4 A magnified view of the area indicated by the mark B in the middle; Figure 6 This is an appendix to this embodiment. Figure 4 A magnified view of the area indicated by the mark A in the middle; Figure 7 This is a schematic diagram of the chicken manure homogenizing tank, cyclone grit chamber, and sand-water separator in this embodiment; Figure 8 This is a schematic diagram of the first anaerobic ammonia oxidation reactor and the second anaerobic ammonia oxidation reactor in this embodiment; Figure 9 This is a schematic diagram of the struvite reaction tower in this embodiment; Figure 10 This is a schematic diagram of the second anaerobic reactor in this embodiment; Figure 11 This is a schematic diagram of the second anaerobic ammonia oxidation reactor in this embodiment; Figure 12 This is a schematic diagram of the primary sedimentation tank, phosphorus removal reaction tank, flocculation tank, secondary sedimentation tank, first dosing tank, and second dosing tank in this embodiment; Figure 13 This is a schematic diagram of the biogas storage tank in this embodiment.

[0011] Figure label: 1. Chicken manure homogenizing tank; 2. Cyclone grit chamber; 3. Sand-water separator; 4. Biogas storage tank; 5. First anaerobic reactor; 6. Struvite reaction tower; 7. First anaerobic ammonia oxidation reactor; 8. Second anaerobic reactor; 9. Second anaerobic ammonia oxidation reactor; 10. Anoxic tank; 11. Aerobic tank; 1101. Aeration pipe; 1102. Air inlet pipe; 1103. Tank body; 1104. Valve; 12. Alkali dosing tank; 13. Blower; 14. Primary sedimentation tank; 15. Phosphorus removal reaction tank; 16. Flocculation tank; 17. Secondary sedimentation tank; 171. 172. Inlet pipe; 173. Tank; 174. Walkway plate; 175. Outlet weir plate; 176. Slag baffle plate; 177. Flow guide cylinder; 178. Support base; 179. Slag skimming device; 1710. Sludge scraper; 1711. Support truss; 1712. Slag discharge hopper; 1713. Transmission mechanism; 17131. Motor; 17132. Roller; 1714. Slag discharge pipe; 1715. Sludge discharge pipe; 1716. Base; 1717. Collection tank; 1718. Outlet weir; 18. First dosing tank; 19. Second dosing tank. Detailed Implementation

[0012] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0013] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0014] To harmlessly treat animal manure and wastewater generated by livestock farms and fully utilize the resources in the wastewater, this embodiment provides a biomass energy comprehensive utilization system, referring to... Figure 1 ,include: Reference Figure 8 The biomass energy comprehensive utilization system includes a first anaerobic reactor 5. Wastewater from the sewage treatment plant is directly transported to the first anaerobic reactor 5. Within the first anaerobic reactor 5, microorganisms decompose the organic matter in the wastewater to generate biogas. The biogas is stored in a biogas storage tank 4, thus achieving the treatment of organic matter in the wastewater to reduce environmental pollution and generating biogas for resource recovery and utilization. The wastewater produced after the reaction in the first anaerobic reactor 5 is then transported to a first anaerobic ammonia oxidation reactor 7. Anaerobic reactors are existing technology and will not be described in detail further.

[0015] Reference Figure 8 The biomass energy comprehensive utilization system includes a first anaerobic ammonia oxidation reactor 7, which is connected to the outlet of the first anaerobic reactor 5. In the anoxic environment inside the first anaerobic ammonia oxidation reactor 7, anaerobic ammonia oxidizing bacteria convert ammonia nitrogen and nitrite nitrogen in the wastewater into nitrogen gas, which is then discharged from the wastewater, thus treating the ammonia nitrogen and nitrite nitrogen in the wastewater and reducing environmental pollution. The wastewater from the first anaerobic ammonia oxidation reactor 7 is then transported to anoxic tank 10. The anaerobic ammonia oxidation reactor is existing technology and will not be described in detail further.

[0016] Reaction formula:

[0017] Animal manure collected from farms, such as chicken manure from chicken farms, is transported to a manure homogenization tank where it is stirred in water to form a slurry. This slurry is then transported to the sand-water separator 3. The sand-water separator 3 is used to separate solid particles from the wastewater. Sand-water separators are existing technology and will not be described in detail here.

[0018] Reference Figure 10The biomass energy comprehensive utilization system includes a second anaerobic reactor 8. Wastewater separated by the sand-water separator 3 is transported to the second anaerobic reactor 8. Inside the second anaerobic reactor 8, microorganisms decompose the organic matter in the wastewater to generate biogas. The biogas is stored in a biogas storage tank 4, thus achieving the treatment of organic matter in the wastewater to reduce environmental pollution and realizing resource recovery and utilization through biogas production. The second anaerobic reactor 8 is identical to the first anaerobic reactor 5 and will not be described in detail further.

[0019] Reference Figure 9 The biomass energy comprehensive utilization system includes a struvite reaction tower 6. Wastewater is transported to the struvite reaction tower 6, and magnesium salts, such as magnesium oxide (MgO), are added to the wastewater. In the struvite reaction tower 6, magnesium ions, phosphate ions, and ammonium ions react to generate struvite, thereby removing phosphorus and nitrogen from the wastewater.

[0020] Reaction formula:

[0021] Reference Figure 11 The biomass energy comprehensive utilization system includes a second anaerobic ammonia oxidation reactor 9, in which anaerobic ammonia oxidizing bacteria convert ammonia nitrogen and nitrite nitrogen in the solution into nitrogen gas. The second anaerobic ammonia oxidation reactor 9 is the same as the first anaerobic ammonia oxidation reactor 7, and will not be described in detail further.

[0022] Reference Figure 2 The biomass energy comprehensive utilization system includes an anoxic tank 10, in which denitrifying bacteria utilize organic matter in wastewater to degrade nitrates and produce nitrogen gas. Specifically, nitrate nitrogen (NO3⁻) is used as an electron acceptor, and organic matter in wastewater is used as an electron donor (carbon source) to produce nitrogen gas for discharge, thereby achieving denitrification of wastewater and removal of organic matter from the wastewater at the same time.

[0023] Reaction formula:

[0024] Reference Figure 2 The biomass energy comprehensive utilization system includes an aerobic tank 11. Inside the aerobic tank 11, nitrifying bacteria (ammonia oxidizing bacteria and nitrite oxidizing bacteria) and aerobic heterotrophic bacteria convert ammonia nitrogen in wastewater into nitrate. Then, a portion of the nitrate-containing wastewater is returned to the anoxic tank 10, and the remaining wastewater is transported to the primary sedimentation tank 14. Specifically, the flow path of the pipeline from the aerobic tank 11 to the anoxic tank 10 is controlled by opening or closing valves to regulate the amount of nitrate returned from the aerobic tank 11 to the anoxic tank 10. In the aerobic tank 11, ammonia nitrogen is converted into nitrate nitrogen, providing "raw material" for denitrification in the anoxic tank 10.

[0025] Reaction formula:

[0026] Reference Figure 12 The biomass energy comprehensive utilization system includes a primary sedimentation tank 14, which separates activated sludge from wastewater through sedimentation. A portion of the separated activated sludge is returned to an anoxic tank to maintain the bacterial community concentration (i.e., the bacteria carried in the sludge are returned to the anoxic tank to maintain the bacterial community level). The remaining activated sludge is discharged to the sludge dewatering workshop. The primary sedimentation tank 14 and the secondary sedimentation tank 17 have the same structure; see the description of the secondary sedimentation tank 17 for details. The activated sludge contains a flocculent mixture of microbial communities (bacteria, etc.), organic and inorganic particles.

[0027] Reference Figure 12 The biomass energy comprehensive utilization system includes a secondary sedimentation tank 17, in which flocculants are added to phosphorus-containing wastewater, and phosphorus precipitates in the secondary sedimentation tank.

[0028] The biomass energy comprehensive utilization system includes a sulfur-based solid-state denitrification reactor. Within this reactor, denitrification by autotrophic microorganisms reduces nitrate nitrogen to nitrogen gas, removing large amounts of nitrogen and phosphorus from industrial wastewater and animal excrement before discharge to reduce environmental pollution. The sulfur-based solid-state denitrification reactor is existing technology and will not be described in detail here. Reaction formula:

[0029] In a sulfur-based solid-state denitrification reactor, autotrophic denitrifying microorganisms use sulfur particles as energy and electron donors to carry out denitrification reactions without the need to add organic carbon, and the process does not increase carbon emissions.

[0030] Reference Figure 13 The biomass energy comprehensive utilization system includes a desulfurization device. This device desulfurizes the biogas from the biogas storage tank 4 (removing hydrogen sulfide) to produce elemental sulfur. The desulfurized biogas is then transported to a biogas purification device for further purification, resulting in biogas with a high methane content. The generated elemental sulfur can be added to the sulfur-based solid-state antinitrification reactor to remove nitrogen, eliminating the need for additional sulfur purchases and achieving sulfur resource recovery. The desulfurization device employs dry desulfurization equipment, wet desulfurization equipment, etc., which are existing technologies and will not be described in detail here. The desulfurization device uses ferric oxide as packing material for biogas desulfurization.

[0031] Reaction formula:

[0032] In summary, the aforementioned biomass energy comprehensive utilization system: For wastewater discharged from the sewage treatment plant, the first anaerobic reactor treats the organic matter in the wastewater and produces biogas, achieving the recovery and utilization of organic matter. A desulfurization device is used to desulfurize the biogas, and the generated elemental sulfur is used as packing material in the sulfur-based solid-phase antinitrification reactor to remove nitrogen from the wastewater, achieving sulfur recovery and utilization. In the first anaerobic ammonia oxidation reactor, ammonia nitrogen and nitrite nitrogen in the wastewater are converted into nitrogen gas, removing nitrogen from the wastewater.

[0033] Animal manure discharged from farms is high in phosphorus and nitrogen. It is first treated in a homogenizing tank, then separated from particulate matter using a sand separator. A second anaerobic reactor treats the organic matter in the wastewater and produces biogas, achieving organic matter recycling. In the struvite reaction tower, magnesium ions react with phosphate and ammonium ions to form struvite, which removes large amounts of phosphorus and nitrogen from the wastewater. In the second anaerobic ammonia oxidation reactor, ammonia nitrogen and nitrite nitrogen in the wastewater are converted into nitrogen gas, removing nitrogen from the wastewater.

[0034] Within the anoxic tank 10, denitrifying bacteria utilize organic matter in the wastewater to degrade nitrates, producing nitrogen gas and thus removing nitrogen from the wastewater while simultaneously removing organic matter. Within the aerobic tank 11, ammonia nitrogen is converted into nitrate nitrogen, providing "raw material" for denitrification in the anoxic tank 10. In the secondary sedimentation tank, the flocculants produced by the reaction are precipitated and discharged. In a sulfur-based solid-state denitrification reactor, nitrate nitrogen is reduced to nitrogen gas, further removing nitrogen from the wastewater.

[0035] Through the above steps, organic matter and elemental sulfur in wastewater can be recycled and utilized. Phosphorus and nitrogen in wastewater can be removed through multiple reactions, and the wastewater can be purified before being discharged, reducing environmental pollution.

[0036] Reference Figure 2 The aerobic tank 11 includes a tank body 1103, an aeration pipe 1101 is arranged at the bottom of the tank body 1103, and multiple aeration pipes 1101 can be laid in parallel inside the tank body 1103. The outlet of the air inlet pipe 1102 is connected to the aeration pipe 1101, and the inlet of the air inlet pipe 1102 is connected to the blower 13.

[0037] The blower 13 delivers air to the aeration pipe 1101 through the air inlet pipe 1102. The air flows from the aeration pipe 1101 into the aerobic tank 11. As the air floats upward from the bottom of the tank 1103, it can fully contact the ammonium ions in the liquid, which is conducive to the full reaction in the aerobic tank 11.

[0038] Reference Figure 12The biomass energy comprehensive utilization system also includes a phosphorus removal reaction tank 15, which is connected to the drain outlet of the primary sedimentation tank 14 to receive the wastewater output from the primary sedimentation tank 14. Polyferric chloride (PFC) solution in the first dosing tank 18 is added to the phosphorus removal reaction tank 15, releasing iron ions that react with phosphate ions in the wastewater to generate ferric phosphate. Ferric phosphate is insoluble in water and precipitates out.

[0039] Reaction formula:

[0040] Reference Figure 12 The biomass energy comprehensive utilization system also includes a flocculation tank 16, which is connected to the outlet of the phosphorus removal reaction tank 15. The water containing ferric phosphate in the phosphorus removal reaction tank 15 is transported to the flocculation tank 16. Polyacrylamide (PAM) in the second dosing tank 19 is added to the flocculation tank 16. Polyacrylamide (PAM) is a flocculant used to aggregate small particles in the water to form larger and denser flocs, which is used to accelerate the flocculation and sedimentation of ferric phosphate in the water. Afterwards, the wastewater and sediment in the flocculation tank 16 are transported to the secondary sedimentation tank 17.

[0041] Reference Figure 3 and Figure 4 The secondary sedimentation tank 17 includes a base 1716, and a collection tank 1717 is provided at the center of the base 1716. The upper surface of the base 1716 extends downward from the edge toward the center to the collection tank 1717. The base 1716 forms a funnel shape, and the collection tank 1717 is located at the funnel opening position after the base 1716 has contracted.

[0042] The secondary sedimentation tank 17 also includes a tank 173. In this embodiment, the tank 173 is cylindrical and is installed at the upper edge of the base 1716.

[0043] The secondary sedimentation tank 17 also includes a guide pipe 171, which is vertically installed at the center of the base 1716. A first outlet is provided in the upper side wall of the guide pipe 171, and multiple first outlets are distributed around the circumference of the guide pipe 171.

[0044] The secondary sedimentation tank 17 also includes an inlet pipe 172, which connects to the lower part of the guide pipe 171. Wastewater is transported into the guide pipe 171 through the inlet pipe 172, and discharged into the tank 173 through the first outlet of the guide pipe 171. The ferric phosphate in the wastewater flocculates and precipitates onto the base 1716, and then the precipitate slides down the upper surface of the base 1716 into the collection tank 1717, completing the collection of the precipitate.

[0045] The secondary sedimentation tank 17 also includes a sludge discharge pipe 1715, which is connected to the collection tank 1717. The sediment deposited in the collection tank 1717 can be discharged through the sludge discharge pipe 1715.

[0046] Reference Figure 4 The secondary sedimentation tank 17 also includes a support base 178, which is installed at the top of the guide pipe 171.

[0047] The secondary sedimentation tank 17 also includes a guide tube 177, which covers the upper end of the guide pipe 171. In this embodiment, the guide tube 177 is cylindrical, and a second water outlet is provided inside the side wall of the guide tube 177. Multiple second water outlets are distributed along the circumference of the guide tube 177. Water enters the guide tube 177 from the first water outlet on the guide pipe 171, and then exits through the second water outlet on the side wall of the guide tube 177 into the tank 173.

[0048] The secondary sedimentation tank 17 also includes a support truss 1711, which is rotatably mounted on the support base 178 with the support base 178 as the pivot, and the support truss 1711 is arranged radially inside the tank 173.

[0049] The secondary sedimentation tank 17 also includes a sludge scraper 1710, which is installed at the bottom of the support truss 1711. The sludge scraper 1710 is inclined in the same direction as the upper surface of the base 1716 and is close to the upper surface of the base 1716.

[0050] The secondary sedimentation tank 17 also includes a walkway 174, which is installed at the top edge of the tank 173 to form a ring structure.

[0051] Reference Figure 5The secondary sedimentation tank 17 further includes a transmission mechanism 1713, which is fixed to the lower side of the end of the support truss 1711. The transmission mechanism 1713 includes a motor and rollers. The motor is fixedly installed on the lower side of the support truss 1711. The motor 17131 drives the rollers 17132 to rotate. The rollers move along the walkway 174 and simultaneously drive the support truss 1711 and the scraper 1710 to rotate around the support base 178 inside the tank 173.

[0052] As the scraper blade 1710 rotates inside the tank 173, it scrapes the sediment deposited on the upper surface of the base 1716. After being scraped, the sediment slides down the base 1716 into the collection tank 1717, thereby accelerating the deposition of sediment into the collection tank 1717.

[0053] Reference Figure 6 The secondary sedimentation tank 17 further includes: The water outlet weir 1718 is installed inside the tank 173 near the upper port. In this embodiment, the water outlet weir 1718 forms a circle, and the water outlet weir 1718 and the upper part of the tank 173 form an annular area to contain overflowing water. The water that overflows into the annular area can then be pumped away by a water pump.

[0054] A water outlet weir plate 175 is installed on the upper end of the water outlet weir 1718. Multiple water outlet weir plates 175 are arranged along the circumference of the water outlet weir 1718. In this embodiment, the water outlet weir plate 175 is a triangular plate with a notch between two adjacent water outlet weir plates 175. The notch is an inverted triangle. When the liquid level in the water outlet weir 1718 rises to the position of the water outlet weir plate 175, the water overflows from the notch into the annular area formed by the upper part of the water outlet weir 1718 and the tank 173. Then, the overflowing water can be discharged by a water pump.

[0055] The slag baffle 176 is installed on the inner side of the outlet weir 1718. The upper end of the slag baffle 176 is at a higher position than the upper end of the outlet weir plate 175. The slag baffle 176 forms a circle to block floating slag on the liquid surface.

[0056] The slag discharge hopper 1712 is installed on the inner side of the upper part of the effluent weir 1718. The slag discharge hopper 1712 is located in the space enclosed by the slag baffle 176 and the opening faces upward, and is used to collect floating slag.

[0057] In this embodiment, refer to Figure 6The skimming device 179 is fixed to the support truss 1711. The skimming device 179 comprises two parts, both of which are rectangular plates. The first part is directly connected to the support truss 1711, and the second part is welded to the end of the first part, near the inner side of the baffle plate 176. In the height direction of the tank 173, the thickness of the second part is less than the thickness of the first part.

[0058] As the supporting truss 1711 rotates, the skimming device 179 scrapes the scum on the liquid surface at one end (i.e., the first part) near the baffle plate 176. When the skimming device 179 passes through the scum discharge hopper 1712, it scrapes the scum into the scum discharge hopper 1712.

[0059] The slag discharge pipe 1714 is installed inside the side wall of the tank 173, as shown in the figure. Figure 6 The slag discharge pipe 1714 is bent into an L-shape. The vertical part of the slag discharge pipe 1714 is connected to the bottom of the slag discharge hopper 1712, and the horizontal part of the slag discharge pipe 1714 extends laterally to the outside of the tank 173. The scum (flocculation, mud) collected in the slag discharge hopper 1712 is discharged through the slag discharge pipe 1714.

[0060] The process of removing scum and overflowing water: When scum is present on the liquid surface, the scum skimming device 179 will move the scum as it rotates. When the scum is pushed to the scum discharge hopper 1712, it will slide into the scum discharge hopper 1712, and then the scum will flow along the attached... Figure 6 The slag is discharged from the discharge pipe 1714 in the direction indicated by the middle arrow D.

[0061] Reference Figure 6 During the process of the liquid level rising inside the tank 173, the baffle plate 176 and the outlet weir 1718 are connected by a metal plate, forming a space between the baffle plate 176 and the outlet weir 1718 for the liquid to rise and pass through. Figure 6 The liquid enters between the baffle plate 176 and the outlet weir 1718 in the direction indicated by the middle arrow C. In the vertical direction, the upper end of the baffle plate 176 is positioned above the outlet weir plate 175. When the liquid level rises to the gap between the two outlet weir plates 175, the liquid will flow through the gap into the annular area formed by the outlet weir 1718 and the tank 173, completing the overflow of water. Then, the water between the outlet weir 1718 and the tank 173 can be pumped away using a water pump.

[0062] In another embodiment, a method for comprehensive utilization of biomass energy is provided, applicable to the aforementioned comprehensive utilization system of biomass energy, comprising the following steps: Step 1: For the wastewater in the sewage treatment plant, the wastewater to be treated is transported to the first anaerobic reactor 5. In the first anaerobic reactor 5, microorganisms decompose the organic matter in the wastewater to generate biogas, which is then stored in a biogas storage tank.

[0063] Step 2: The biogas in the biogas storage tank is transported to the desulfurization equipment, which desulfurizes the biogas to produce elemental sulfur. The desulfurized biogas is then transported to the biogas purification equipment for purification to obtain biogas with a high methane content, thus realizing resource recovery and utilization.

[0064] Step 3: The wastewater in the first anaerobic reactor 5 is transported to the first anaerobic ammonia oxidation reactor 7. In the first anaerobic ammonia oxidation reactor 7, anaerobic ammonia oxidizing bacteria convert ammonia nitrogen and nitrite nitrogen into nitrogen gas. After that, the wastewater is transported to the anoxic tank.

[0065] Step 4: Animal manure collected from the farm is transported to a homogenizing tank. After being mixed evenly in the homogenizing tank, the manure is then transported to a cyclone separator 2, as per [reference needed]. Figure 7 The cyclone separator 2 separates the solids and liquids in the slurry and transports the separated wastewater to the sand-water separator 3, which separates the solid particles.

[0066] The cyclone sedimentation tank 2 and the sand-water separator 3 are existing technologies and will not be described in detail here.

[0067] Step 5: The wastewater in the sand-water separator is transported to the second anaerobic reactor 8. In the second anaerobic reactor 8, microorganisms decompose the organic matter in the wastewater to generate biogas. The biogas is stored in a biogas storage tank, and the wastewater is transported to the struvite reaction tower 6.

[0068] Step 6: Add magnesium hydroxide to the struvite reaction tower 6. The magnesium ions produced react with phosphate and ammonium ions in the wastewater to form struvite, thereby removing phosphate and ammonium ions from the wastewater.

[0069] Step 7: In the second anaerobic ammonia oxidation reactor 9, anaerobic ammonia oxidizing bacteria convert ammonia nitrogen and nitrite nitrogen in the wastewater into nitrogen gas and discharge it, and then transport the wastewater to the anoxic tank.

[0070] Step 8: In the anoxic tank 10, denitrifying bacteria use the organic matter in the wastewater to degrade nitrates and produce nitrogen gas. The wastewater is then sent to the aerobic tank 11.

[0071] Step 9: Ammonia nitrogen is converted into nitrate in the aerobic tank 11. Then, part of the wastewater containing nitrate is returned to the anoxic tank, and the remaining part is transported to the primary sedimentation tank 14.

[0072] Step 10: In the primary sedimentation tank 14, the activated sludge in the wastewater is separated by sedimentation. Part of the separated activated sludge is returned to the anoxic tank to maintain the bacterial concentration, and the remaining activated sludge is discharged to the sludge dewatering workshop.

[0073] Step 11: Add flocculant to the phosphorus-containing solution, and phosphorus precipitates in the secondary sedimentation tank 17.

[0074] In the sulfur-based solid-state denitrification reactor, denitrification by autotrophic microorganisms reduces nitrate nitrogen to nitrogen gas.

[0075] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A biomass energy comprehensive utilization system, characterized in that it comprises: In the first anaerobic reactor (5), microorganisms decompose organic matter in wastewater to generate biogas, which is then stored in a biogas storage tank (4). In the first anaerobic ammonia oxidation reactor (7), anaerobic ammonia oxidizing bacteria convert ammonia nitrogen and nitrite nitrogen into nitrogen gas and discharge it, and the wastewater is transported to the anoxic tank. Sand separator (3) is used to separate solid particles from wastewater; The second anaerobic reactor (8) is in which microorganisms decompose organic matter in wastewater to generate biogas, which is then stored in a biogas storage tank. The struvite reaction tower (6) reacts magnesium ions, phosphate and ammonium ions to generate struvite, thereby removing phosphate and ammonium ions from the wastewater. The second anaerobic ammonia oxidation reactor (9) is in which anaerobic ammonia oxidizing bacteria convert ammonia nitrogen and nitrite nitrogen in wastewater into nitrogen gas and discharge it. Then the wastewater is transported to the anoxic tank. Anoxic tank (10), in which denitrifying bacteria utilize organic matter in wastewater to degrade nitrates and produce nitrogen gas; In the aerobic tank (11), ammonia nitrogen is converted into nitrate, and then the wastewater containing nitrate is partially returned to the anoxic tank, and the remaining part is transported to the primary sedimentation tank (14). Primary sedimentation tank (14) separates activated sludge from wastewater through sedimentation. Part of the separated activated sludge is returned to the anoxic tank to maintain the bacterial concentration, and the remaining activated sludge is discharged to the sludge dewatering workshop. In the secondary sedimentation tank (17), flocculant is added to the phosphorus-containing wastewater, and phosphorus precipitates in the secondary sedimentation tank. The sulfur-based solid-state denitrification reactor reduces nitrate nitrogen to nitrogen gas through denitrification by autotrophic microorganisms. This process removes large amounts of nitrogen and phosphorus from industrial wastewater and animal excrement before discharge, thereby reducing environmental pollution.

2. The biomass energy comprehensive utilization system according to claim 1, characterized in that... The aerobic tank (11) includes a tank body (1103), an aeration pipe (1101) is arranged at the bottom of the tank body (1103), the outlet of the air inlet pipe (1102) is connected to the aeration pipe (1101), and the inlet of the air inlet pipe (1102) is connected to the blower (13); the blower (13) supplies air to the aerobic tank (11) through the air inlet pipe (1102) to meet the reaction needs in the aerobic tank (11).

3. The biomass energy comprehensive utilization system according to claim 1, characterized in that... It also includes a desulfurization device, which desulfurizes the biogas transported from the biogas storage tank to produce elemental sulfur, and then transports the desulfurized biogas to a biogas purification device for purification to obtain biogas with a high methane content.

4. The biomass energy comprehensive utilization system according to claim 1, characterized in that... It also includes a phosphorus removal reaction tank (15), which is connected to the drain outlet of the primary sedimentation tank (14) to receive the wastewater output from the primary sedimentation tank (14). The polyferric chloride solution in the first dosing tank (18) is added to the phosphorus removal reaction tank (15) and reacts with the phosphate in the wastewater to generate ferric phosphate.

5. The biomass energy comprehensive utilization system according to claim 4, characterized in that... It also includes a flocculation tank (16), which is connected to the outlet of the phosphorus removal reaction tank (15). The water containing ferric phosphate in the phosphorus removal reaction tank (15) is transported to the flocculation tank (16), and polyacrylamide in the second dosing tank (19) is added to the flocculation tank (16) to accelerate the flocculation and sedimentation of ferric phosphate in the water. The water and sediment in the flocculation tank (16) are transported to the secondary sedimentation tank (17).

6. The biomass energy comprehensive utilization system according to claim 1, characterized in that... The secondary sedimentation tank (17) includes: A base (1716) has a collection pool (1717) at the center of the base (1716), and the upper surface of the base (1716) extends downward from the edge toward the center to the collection pool (1717). The can (173) is mounted on top of the base (1716); A guide pipe (171) is vertically installed at the center of the base (1716), and a first outlet is provided in the upper side wall of the guide pipe (171). The inlet pipe (172) is connected to the lower part of the guide pipe (171); wastewater is transported into the guide pipe (171) through the inlet pipe (172), and the wastewater is discharged into the tank (173) through the first outlet of the guide pipe (171). The ferric phosphate in the wastewater flocculates and precipitates onto the base (1716) and slides down into the collection tank (1717); A sludge discharge pipe (1715) is connected to the collection tank (1717) for discharging sediment.

7. The biomass energy comprehensive utilization system according to claim 6, characterized in that... The secondary sedimentation tank (17) further includes a support base (178), which is installed at the top of the guide pipe (171); A guide tube (177) is installed on the upper end of the guide pipe (171). Water is output from the first outlet on the guide pipe (171) and enters the guide tube (177). Then, the water is discharged through the second outlet on the side wall of the guide tube (177) and enters the tank (173). A support truss (1711) is rotatably mounted on the support base (178) about the support base (178) as a pivot, and the support truss (1711) is arranged radially inside the tank (173). A scraper blade (1710) is installed at the bottom of the support truss (1711). The scraper blade (1710) is inclined in the same direction as the upper surface of the base (1716) and is close to the upper surface of the base (1716). A walkway plate (174) is installed at the top edge of the tank (173); The transmission mechanism (1713) is fixed on the lower side of the end of the support truss (1711). The transmission mechanism (1713) includes a motor and a roller. The motor drives the roller to rotate. The roller moves along the walkway plate (174) and simultaneously drives the support truss (1711) and the sludge scraper (1710) to rotate around the support base (178) in the tank (173) to promote the sediment to settle into the collection tank (1717).

8. The biomass energy comprehensive utilization system according to claim 7, characterized in that... The secondary sedimentation tank (17) further includes: an effluent weir (1718), installed inside the tank (173) near the upper port; A water outlet weir plate (175) is installed at the upper end of the water outlet weir (1718). Multiple water outlet weir plates (175) are arranged along the circumference of the water outlet weir (1718). A gap is reserved between two adjacent water outlet weir plates (175) so that water overflows from the gap. A slag baffle (176) is installed on the inner side of the outlet weir (1718). The slag baffle (176) forms a circle to block slag floating on the liquid surface. The slag discharge hopper (1712) is installed on the upper side of the effluent weir (1718), within the space enclosed by the slag baffle plate (176), and its opening faces upward. A skimming device (179) is fixed on the support truss (1711). During rotation, the skimming device (179) scrapes the scum floating on the liquid surface into the scum discharge hopper (1712). The slag discharge pipe (1714) is connected to the slag discharge hopper (1712) for discharging the collected slag.

9. A method for comprehensive utilization of biomass energy, applicable to the comprehensive utilization system of biomass energy as described in any one of claims 1 to 8, characterized in that... The steps include: Step 1: The wastewater to be treated is transported to the first anaerobic reactor (5). In the first anaerobic reactor, microorganisms decompose the organic matter in the wastewater to generate biogas, which is then stored in a biogas storage tank (4). Step 2: The biogas in the biogas storage tank is transported to the desulfurization equipment, which desulfurizes the biogas to produce elemental sulfur. The desulfurized biogas is then transported to the biogas purification equipment for purification to obtain biogas with a high methane content. Step 3: In the first anaerobic ammonia oxidation reactor (7), anaerobic ammonia oxidizing bacteria convert ammonia nitrogen and nitrite nitrogen into nitrogen gas, and the wastewater is transported to the anoxic tank; Step 4: After the animal manure is mixed evenly in the homogenizing tank, it is transported to the sand-water separator, which separates the solid particles in the wastewater. Step 5: Microorganisms decompose the organic matter in the wastewater to generate biogas in the second anaerobic reactor (8). The biogas is stored in the biogas storage tank and the wastewater is transported to the struvite reaction tower (6). Step 6: Inside the struvite reaction tower (6), magnesium ions react with phosphate ions and ammonium ions in the wastewater to generate struvite, thereby removing phosphate and ammonium ions from the wastewater. Step 7: In the second anaerobic ammonia oxidation reactor (9), anaerobic ammonia oxidizing bacteria convert ammonia nitrogen and nitrite nitrogen in the wastewater into nitrogen gas and discharge it, and then transport the wastewater to the anoxic tank. Step 8: In the anoxic tank (10), denitrifying bacteria use the organic matter in the wastewater to degrade nitrates and produce nitrogen gas. The wastewater is then sent to the aerobic tank (11). Step 9: Ammonia nitrogen is converted into nitrate in the aerobic tank (11), and then part of the wastewater containing nitrate is returned to the anoxic tank, and the remaining part is transported to the primary sedimentation tank (14). Step 10: Separate the activated sludge from the wastewater through sedimentation in the primary sedimentation tank (14). Part of the separated activated sludge is returned to the anoxic tank to maintain the bacterial concentration, and the remaining activated sludge is discharged to the sludge dewatering workshop. Step 11: Add flocculant to the phosphorus-containing solution, and the phosphorus precipitates in the secondary sedimentation tank (17); In the sulfur-based solid-state denitrification reactor, denitrification by autotrophic microorganisms reduces nitrate nitrogen to nitrogen gas.

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