Ammonia sequestering system

Patent metadata

Field	Value
Publication number	US-10202287-B2
Application number	US-201615081321-A
Country	US
Kind code	B2
Filing date	Mar 25, 2016
Priority date	Mar 25, 2016
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

The present invention is an ammonia sequestering system including a system controller connected to a plurality of flow control valves, a feed stream extending through a system inlet, and a system outlet. The feed stream is a liquid contaminated with ammonia. At least one exchange column is located between the system inlet and the system outlet. The ion column includes an ion exchange material, a column inlet connected to one of the flow control valves, and a column outlet connected to another of the flow control valves. The system also includes a regenerant stream of an aqueous solution of sodium cations, as well as an ammonia brine stream made up of the regenerant stream and ammonia.

First claim

What is claimed is:

1. An ammonia sequestering system, comprised of:
a system controller connected to a plurality of flow control valves;
a feed stream in communication with a system inlet, wherein said feed stream is a liquid contaminated with ammonia;

a system outlet;
a plurality of ion exchange columns located between said system inlet and said system outlet, wherein each of said plurality of ion exchange columns includes an ion exchange material, a column inlet connected to one of said plurality of flow control valves, and a column outlet selectively connected by one of said plurality of flow control valves to said system outlet, a column inlet of another ion exchange column, or an electrolysis system;
a regenerant system comprising at least one regenerant storage chamber located externally to said at least one ion exchange column between said column outlet and said column inlet and a regenerant stream, wherein said regenerant stream is an aqueous solution of sodium cations;

at least one ammonia brine storage chamber located externally to said at least one ion exchange column and connected to said column outlet, and
the electrolysis system comprises at least one electrolysis device located externally to said at least one ion exchange column between said column outlet and said at least one regenerant storage chamber, wherein each of said at least one electrolysis devices comprise an anode chamber having an anode and a cathode chamber having a cathode, wherein an electrolysis membrane separates said anode chamber from said cathode chamber.

2. The system of claim 1 , wherein said system further includes at least one ammonia sensor connected to said system controller.

3. The system of claim 2 , wherein said at least one ammonia sensor is a colorimetric sensor.

4. The system of claim 2 , wherein said at least one ammonia sensor comprises a sensor located between said system inlet and at least one of said plurality of flow control valves.

5. The system of claim 2 , wherein said at least one ammonia sensor comprises a sensor located between said system outlet and at least one of said column outlets.

6. The system of claim 1 , wherein said system further includes at least one ammonia fuel cell located externally to said plurality of ion exchange columns and connected to at least one of said column outlets.

7. The system of claim 1 , wherein said at least one electrolysis devices further includes an electrolysis liquid outlet connected to said at least one regenerant storage chamber, a first electrolysis gas outlet extending from said anode chamber and a second electrolysis gas outlet extending from said cathode chamber.

8. The system of claim 1 , wherein said regenerant solution has a pH of approximately 10 to approximately 14.

9. The system of claim 1 , wherein said ion exchange material is selected from the group consisting of: zeolites and synthetic ion exchange material.

10. The system of claim 1 , wherein said ion exchange material is clinoptilolite.

11. The system of claim 1 , wherein said plurality of ion exchange columns are connected in series.

12. An ammonia sequestering method comprising the steps of:
providing a system controller connected to a plurality of flow control valves to control fluid flow in the following steps;
a treatment cycle comprising introducing a feed stream into a system inlet and further into a plurality of ion exchange columns located between said system inlet and a system outlet, wherein each of said plurality of ion exchange columns includes an ion exchange material, a column inlet connected to one of said plurality of flow control valves, and a column outlet selectively connected by one of said plurality of flow control valves to said system outlet, a column inlet of another ion exchange column, or an electrolysis system, wherein said feed stream is a liquid contaminated with ammonia, said ion exchange material sequestering said ammonia, and discharging a purified stream from a system outlet; and
a regeneration cycle comprising directing a regenerant stream comprising an aqueous solution of sodium cations from at least one regenerant storage chamber located externally to said plurality of ion exchange columns and between said column outlet and said column inlet through said plurality of ion exchange columns to remove said sequestered ammonia from said ion exchange material,
providing at least one ammonia brine storage chamber located externally to said plurality of ion exchange columns and connected to said column outlet to store an ammonia brine stream, wherein said ammonia brine stream is made up of said regenerant stream and ammonia, and
treating said ammonia brine stream to form said regenerant stream, a hydrogen gas stream and a nitrogen gas stream by passing said ammonia brine stream into said electrolysis system, said electrolysis system comprising at least one electrolysis device located externally to said plurality of ion exchange columns between said column outlet and said at least one regenerant storage chamber, wherein each of said at least one electrolysis devices comprise an anode chamber having an anode, said nitrogen gas stream produced by said anode chamber, and a cathode chamber having a cathode, said hydrogen stream being produced by said cathode chamber, wherein an electrolysis membrane separates said anode chamber from said cathode chamber.

13. The method of claim 12 , wherein said regenerant solution is a solution of water and sodium chloride.

14. The method of claim 13 , wherein said regenerant solution includes approximately 90 wt % to approximately 99 wt % water and approximately 1 wt % to approximately 10 wt % sodium chloride.

15. The method of claim 13 , wherein said regenerant solution further comprises sodium hydroxide.

Assignees

• Us Army

Inventors

• Guy Kathryn A
• Page Martin

Classifications

• C02F2101/16

  Nitrogen compounds, e.g. ammonia · CPC title

• C02F2209/40

  Liquid flow rate · CPC title

• C02F2303/16

  Regeneration of sorbents, filters · CPC title

• C25B1/02

  Hydrogen or oxygen · CPC title

• C02F1/46104

  Devices therefor; Their operating or servicing · CPC title