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CN-121974477-A - Direct-current reinforced built-in pyrite filler AAO biological reaction device

CN121974477ACN 121974477 ACN121974477 ACN 121974477ACN-121974477-A

Abstract

The invention discloses a direct current reinforced built-in pyrite filler AAO biological reaction device, and relates to the technical field of sewage treatment. The device comprises a water inlet system, an AAO bioreactor, a mud-water separation system and a direct current power supply, wherein the AAO bioreactor comprises an anaerobic zone, an anoxic zone and an aerobic zone, pyrite filler and carbon brushes are filled in the anoxic zone and the aerobic zone, the water inlet system is connected with the anaerobic zone and is used for conveying sewage into the AAO bioreactor, the mud-water separation system is connected with the aerobic zone and is used for refluxing sludge to the anaerobic zone, and a cathode and an anode of the direct current power supply are both connected with a brush handle of the carbon brushes. By applying direct current, the electron transfer process of microorganisms is accelerated, and the nitrogen and phosphorus removal efficiency is improved. By adding carbon brushes and pyrite filler, the impact load resistance of the system is improved, and the generation of sludge is reduced. And the denitrification and dephosphorization can be realized without adding additional carbon sources and chemical agents, so that the cost is saved.

Inventors

  • Ai Li Jiang nuerla
  • ZHANG ZHIMING
  • YUAN BOBO
  • LI RUOYANG
  • LI WENYAN
  • Anival mamati
  • PENG JIE

Assignees

  • 新疆大学

Dates

Publication Date
20260505
Application Date
20260210

Claims (10)

  1. 1. The direct current reinforced built-in pyrite filler AAO biological reaction device is characterized by comprising a water inlet system (1), an AAO biological reactor (2), a mud-water separation system (3) and a direct current power supply (4); the AAO bioreactor (2) comprises an anaerobic zone (2.1), an anoxic zone (2.2) and an aerobic zone (2.3), wherein pyrite filler (2.10) and carbon brushes (2.5) are filled in the anoxic zone (2.2) and the aerobic zone (2.3); the water inlet system (1) is connected with the anaerobic zone (2.1) and is used for conveying sewage into the AAO bioreactor (2); The mud-water separation system (3) is connected with the aerobic zone (2.3) and is used for refluxing sludge to the anaerobic zone (2.1); The cathode and the anode of the direct current power supply (4) are connected with the brush handle of the carbon brush (2.5).
  2. 2. The direct current reinforced built-in pyrite filler AAO biological reaction device according to claim 1, wherein the water inlet system (1) comprises a water inlet barrel (1.1) and a water inlet pump (1.2); the sewage in the water inlet system (1) is connected with the anaerobic zone (2.1) of the AAO reactor (2) in the water inlet barrel (1.1) through the water inlet pump (1.2).
  3. 3. The direct current reinforced built-in pyrite filler AAO bioreactor device according to claim 1, wherein the AAO bioreactor (2) further comprises a stirrer (2.4), an aeration stone (2.6), a rotameter (2.7), an aeration pump (2.8), a guide plate (2.9) and an internal reflux pump (2.11); dividing the AAO bioreactor (2) into an anaerobic zone (2.1), an anoxic zone (2.2) and an aerobic zone (2.3) through a guide plate (2.9); the stirrer (2.4) is arranged in the anaerobic zone (2.1) and the anoxic zone (2.2); two ends of the internal reflux pump (2.11) are respectively connected with the anoxic zone (2.2) and the aerobic zone (2.3); The aeration pump (2.8) is connected with the aerobic zone (2.3) through the rotameter (2.7) and the aeration stone (2.6) to supply oxygen to the aerobic zone (2.3).
  4. 4. The direct current reinforced built-in pyrite filler AAO biological reaction device according to claim 1, wherein the mud-water separation system (3) comprises a secondary sedimentation tank (3.1) and a sludge reflux pump (3.2); One end of the secondary sedimentation tank (3.1) is connected with the aerobic zone (2.3), and the other end is connected with the sludge reflux pump (3.2).
  5. 5. The direct current enhanced built-in pyrite filler AAO biological reaction device according to claim 1, wherein the volume ratio of the anaerobic zone (2.1), the anoxic zone (2.2) and the aerobic zone (2.3) is 1:2:4.
  6. 6. The direct current reinforced built-in pyrite filler AAO bioreactor device according to claim 1, wherein the anoxic zone (2.2) and the aerobic zone (2.3) are respectively filled with 600g and 1000g of pyrite filler (2.10), and the pyrite filler (2.10) has a particle size of 5-8 mm.
  7. 7. The direct current enhanced built-in pyrite filler AAO bioreactor apparatus according to claim 1, wherein the hydraulic retention time of the AAO bioreactor (2) is 18h.
  8. 8. The direct current enhanced built-in pyrite filler AAO bioreactor apparatus according to claim 1, wherein the internal reflux ratio of the AAO bioreactor (2) is 150%.
  9. 9. The direct current enhanced built-in pyrite packing AAO bioreactor device according to claim 1, wherein the AAO bioreactor (2) has a length, width and height of 79cm, 15cm and 20cm, respectively, and an effective volume of 14L.
  10. 10. The direct current enhanced built-in pyrite filler AAO biological reaction device according to claim 1, wherein 4 and 6 carbon brushes (2.5) are placed in the anoxic zone (2.2) and the aerobic zone (2.3) respectively.

Description

Direct-current reinforced built-in pyrite filler AAO biological reaction device Technical Field The invention relates to the technical field of sewage treatment, in particular to a direct current reinforced AAO biological reaction device with built-in pyrite filler. Background The concentration of the carbon source of the existing urban sewage water is gradually reduced, the concentration of the nitrogen and phosphorus nutrient substances is higher and higher, the ratio of the chemical oxygen demand (Chemical oxygen demand, COD) to Total Phosphorus (TP) and Total Nitrogen (TN) is gradually lowered, and the traditional biological denitrification and dephosphorization process faces multiple technical bottlenecks. Urban sewage is characterized by low C/N (COD/TN < 5), the denitrification efficiency is low due to insufficient carbon source, a large amount of organic carbon sources such as methanol are required to be additionally added, the running cost is increased by 30% -50%, and the carbon sources are converted into CO2 after biochemical reaction and released to the atmosphere, so that a sewage treatment plant becomes an important source of fossil carbon emission. A large number of practical experience shows that when the mass concentration of TP in the inflow water of a sewage treatment plant is more than 4-5mg/L, m (BOD 5)/m (TKN) ratio is lower than 5-8, the traditional biological treatment method is difficult to ensure the dephosphorization and denitrification effect, the carbon source is a necessary factor for denitrification and dephosphorization, the reduction of the carbon source severely restricts the denitrification and dephosphorization effect of urban sewage, so that the urban sewage is difficult to fully denitrify and dephosphorize by simply relying on the inflow water carbon source, a large amount of carbon source is consumed, and chemical flocculation medicament is needed to assist in treatment, so that a large amount of resource waste and carbon emission are caused. An anaerobic-anoxic-aerobic bioreactor (AAO) is used as a sewage treatment process integrating anaerobic phosphorus release, denitrification and aerobic phosphorus absorption, and is widely applied to the field of biological denitrification and phosphorus removal. However, when treating low C/N urban sewage, the AAO process is limited by insufficient carbon source, the competition of the carbon source in the system is aggravated, the denitrification and biological dephosphorization processes are obviously inhibited, the denitrification and dephosphorization efficiency is reduced, and the operation stability is difficult to ensure. Disclosure of Invention The invention aims to provide a direct current reinforced built-in pyrite filler AAO biological reaction device, which aims to solve or improve at least one of the technical problems. In order to achieve the above object, the present invention provides the following solutions: A direct current enhanced built-in pyrite filler AAO bioreaction device comprising: the system comprises a water inlet system, an AAO bioreactor, a mud-water separation system and a direct current power supply; the AAO bioreactor comprises an anaerobic zone, an anoxic zone and an aerobic zone, wherein pyrite filler and carbon brushes are filled in the anoxic zone and the aerobic zone; the water inlet system is connected with the anaerobic zone and is used for conveying sewage into the AAO bioreactor; The mud-water separation system is connected with the aerobic zone and is used for refluxing sludge to the anaerobic zone; The cathode and the anode of the direct current power supply are connected with the brush handle of the carbon brush. Further, the water inlet system comprises a water inlet barrel and a water inlet pump; The sewage in the water inlet system is connected with the anaerobic zone of the AAO reactor in the water inlet barrel through a water inlet pump. Further, the AAO bioreactor also comprises a stirrer, an aeration stone, a rotameter, an aeration pump, a guide plate and an internal reflux pump; dividing the AAO bioreactor into an anaerobic zone, an anoxic zone and an aerobic zone through a guide plate; the stirrer is arranged in the anaerobic zone and the anoxic zone; Two ends of the internal reflux pump are respectively connected with the anoxic zone and the aerobic zone; The aeration pump is connected with the aerobic zone through the rotameter and the aeration stone to supply oxygen to the aerobic zone. Further, the mud-water separation system comprises a secondary sedimentation tank and a mud reflux pump; One end of the secondary sedimentation tank is connected with the aerobic zone, and the other end is connected with the sludge reflux pump. Further, the volume ratio of the anaerobic zone to the anoxic zone to the aerobic zone is 1:2:4. Further, 600g and 1000g of pyrite filler are respectively filled in the anoxic zone and the aerobic zone, and the pyrite filler has a particle size of 5-