Carrier for retaining anammox bacteria for use in wastewater treatment, anammox bacteria-adhered particle, and wastewater treatment apparatus using the carrier

Patent metadata

Field	Value
Publication number	US-11427489-B2
Application number	US-201816772266-A
Country	US
Kind code	B2
Filing date	Dec 13, 2018
Priority date	Dec 13, 2017
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

[Problem] A carrier for retaining anammox bacteria, an anammox bacteria-adhered particle, and a wastewater treatment apparatus are provided that can remarkably reduce the start-up period for obtaining a nitrogen removal speed of 1 kg-N/m3/day.[Solution] A carrier for retaining anammox bacteria includes carbon particles. The carbon particles are desirably graphite particles, particularly isotropic graphite particles. The carbon particles desirably have a zeta potential of −35 mV to 0 mV and an average particle size of 2 μm to 1000 μm.

First claim

The invention claimed is:

1. An anammox bacteria-adhered particle, comprising a carrier comprising isotropic graphite particles and anammox bacteria adhered to the carrier.

2. The anammox bacteria-adhered particle according to claim 1 , wherein the carrier has an apparent zeta potential of −35 mV to 0 mV.

3. The anammox bacteria-adhered particle according to claim 2 , wherein the isotropic graphite particles have an average particle size of 2 μm to 1000 μm.

4. The anammox bacteria-adhered particle according to claim 1 , wherein the isotropic graphite particles have an average particle size of 2 μm to 1000 μm.

5. A wastewater treatment apparatus, characterized in that the anammox bacteria-adhered particle according to claim 1 is disposed in a wastewater treatment tank.

6. The wastewater treatment apparatus according to claim 5 , further comprising a carbon particle supply unit that supplies the isotropic graphite particles constantly or intermittently.

7. A wastewater treatment apparatus, characterized by comprising a wastewater treatment section that treats wastewater by stirring and flowingly moving the anammox bacteria-adhered particle according to claim 1 , and a waste material reserving section that stores the isotropic graphite particles that have lost anammox activity and from which the anammox bacteria have been detached, the wastewater treatment section and the waste material reserving section being separated from each other.

8. The wastewater treatment apparatus according to claim 7 , further comprising a carbon particle supply unit that supplies the isotropic graphite constantly or intermittently.

9. A wastewater treatment apparatus, characterized by comprising the anammox bacteria-adhered particle according to claim 1 and a nitrifying bacteria-adhered particle in which nitrifying bacteria are adhered to carbon particles, the anammox bacteria-adhered particle and the nitrifying bacteria-adhered particle being disposed in a common wastewater treatment tank.

10. The wastewater treatment apparatus according to claim 9 , further comprising a carbon particle supply unit that supplies the isotropic graphite particles constantly or intermittently.

11. An anammox bacteria-adhered particle, comprising a carrier consisting of carbon particles and only anammox bacteria adhered to the carrier.

12. The anammox bacteria-adhered particle according to claim 11 , wherein the carrier has an apparent zeta potential of −35 mV to 0 mV.

13. The anammox bacteria-adhered particle according to claim 11 , wherein the carbon particles have an average particle size of 2 μm to 1000 μm.

14. The anammox bacteria-adhered particle according to claim 11 , wherein the anammox bacteria-adhered particle consists of the carrier consisting of carbon particles and the anammox bacteria adhered to the carrier.

15. A wastewater treatment apparatus, characterized in that the anammox bacteria-adhered particle according to claim 14 is disposed in a wastewater treatment tank.

16. A wastewater treatment apparatus, characterized by comprising a wastewater treatment section that treats wastewater by stirring and flowingly moving the anammox bacteria-adhered particle according to claim 14 , and a waste material reserving section that stores the carbon particles that have lost anammox activity and from which the anammox bacteria have been detached, the wastewater treatment section and the waste material reserving section being separated from each other.

17. A wastewater treatment apparatus, characterized in that the anammox bacteria-adhered particle according to claim 11 is disposed in a wastewater treatment tank.

18. The wastewater treatment apparatus according to claim 17 , further comprising a carbon particle supply unit that supplies the carbon particles constantly or intermittently.

19. A wastewater treatment apparatus, characterized by comprising a wastewater treatment section that treats wastewater by stirring and flowingly moving the anammox bacteria-adhered particle according to claim 11 , and a waste material reserving section that stores the carbon particles that have lost anammox activity and from which the anammox bacteria have been detached, the wastewater treatment section and the waste material reserving section being separated from each other.

20. A wastewater treatment apparatus, characterized by comprising the anammox bacteria-adhered particle according to claim 11 and a nitrifying bacteria-adhered particle in which nitrifying bacteria are adhered to carbon particles, the anammox bacteria-adhered particle and the nitrifying bacteria-adhered particle being disposed in a common wastewater treatment tank.

Assignees

• Univ Toyo
• Toyo Tanso Co

Inventors

• Sumino Tatsuo
• Sakuma Satoshi
• Tojo Tetsuro
• Ishikawa Ai
• NAKAZONO Tomoya
• Takeshita Masatoshi

Classifications

• C02F3/106 Primary

  Carbonaceous materials · CPC title

• C02F3/307 Primary

  characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process · CPC title

• C02F3/303

  characterised by the nitrification · CPC title

• C02F2003/003

  using activated carbon or the like · CPC title

• C02F3/301

  Aerobic and anaerobic treatment in the same reactor · CPC title