Water sterilization devices and uses thereof

Patent metadata

Field	Value
Publication number	US-11267727-B2
Application number	US-201314390009-A
Country	US
Kind code	B2
Filing date	Mar 13, 2013
Priority date	Apr 2, 2012
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A water sterilization device includes: (1) a conduit; (2) a first porous electrode housed in the conduit; (3) a second porous electrode housed in the conduit and disposed adjacent to the first porous electrode; and (4) an electrical source coupled to the first porous electrode and the second porous electrode to apply a voltage difference between the first porous electrode and the second porous electrode. The conduit is configured to provide passage of a fluid stream through the first porous electrode and the second porous electrode, and an inactivation efficiency of pathogens in the fluid stream is at least about 99%, such as at least about 99.9% or at least about 99.95%.

First claim

What is claimed is:

1. A water sterilization device comprising:
a conduit including an inlet to provide entry of untreated water and an outlet to provide exit of treated water;
a porous electrode housed in the conduit and disposed between the inlet and the outlet, the porous electrode including an electrically conductive mesh, nanostructures coupled to a surface of the electrically conductive mesh, and an insulating coating conformally disposed to cover an active surface of the electrically conductive mesh;
a counter electrode housed in the conduit and spaced apart from the porous electrode, wherein the counter electrode and the porous electrode are spaced apart by 1 to 100 μm; and
an electrical source coupled to the porous electrode and the counter electrode to apply a voltage difference between the porous electrode and the counter electrode,
wherein the porous electrode includes pores sized in a range of 5 μm to 400 μm.

2. The water sterilization device of claim 1 , wherein the electrically conductive mesh is a copper mesh.

3. The water sterilization device of claim 1 , wherein the electrically conductive mesh is a stainless steel mesh.

4. The water sterilization device of claim 1 , wherein the porous electrode is a first porous electrode, and further comprising a second porous electrode housed in the conduit and spaced apart from the first porous electrode, and the electrical source is coupled to the second porous electrode to apply a voltage difference between the first porous electrode and the second porous electrode.

5. The water sterilization device of claim 1 , wherein the electrical source is an oscillating voltage source.

6. The water sterilization device of claim 5 , wherein the oscillating voltage source is configured to induce an alternating electric field at a frequency in a range of 0.5 Hz up to 1,000 kHz.

7. The water sterilization device of claim 1 , wherein the pores are sized in a range of 30 μm to 300 μm.

8. The water sterilization device of claim 1 , wherein the porous electrode has a porosity of 0.1 and up to 0.95.

9. The water sterilization device of claim 1 , wherein the insulating coating has a thickness in a range of 100 nm to 10 μm.

10. The water sterilization device of claim 1 , wherein the insulating coating comprises one of a metal oxide, silicon oxide, a carbide, a boride, a nitride, or a silicide.

11. A water sterilization device comprising:
a conduit including an inlet to provide entry of untreated water and an outlet to provide exit of treated water;
a porous electrode housed in the conduit and disposed between the inlet and the outlet, the porous electrode including an electrically conductive mesh, nanostructures coupled to a surface of the electrically conductive mesh, and an insulating coating conformally disposed to cover an active surface of the electrically conductive mesh;
a counter electrode housed in the conduit and spaced apart from the porous electrode, wherein the counter electrode and the porous electrode are spaced apart by 1 to 100 μm;
an electrical source coupled to the porous electrode and the counter electrode to apply a voltage difference between the porous electrode and the counter electrode; and
a filtration unit downstream from the outlet of the conduit.

12. The water sterilization device of claim 11 , wherein the insulating coating has a thickness in a range of 100 nm to 10 μm.

13. The water sterilization device of claim 11 , wherein the porous electrode includes pores sized in a range of 5 μm to 400 μm.

14. The water sterilization device of claim 11 , wherein the filtration unit is a reverse osmosis unit.

15. The water sterilization device of claim 11 , wherein the insulating coating comprises one of a metal oxide, silicon oxide, a carbide, a boride, a nitride, or a silicide.

Assignees

• Univ Leland Stanford Junior
• The Bd Of Trustees Of The Leland Stanford Jr Univ

Inventors

• Cui Yi
• Liu Chong
• Jeong Sangmoo
• Boehm Alexandria

Classifications

• C02F1/4608 Primary

  using electrical discharges · CPC title

• C02F1/505

  by oligodynamic treatment · CPC title

• C02F2307/14

  Treatment of water in water supply networks, e.g. to prevent bacterial growth · CPC title

• C02F2201/46135

  Voltage · CPC title

• C02F2001/46161

  Porous electrodes · CPC title