Methods and systems for removing contaminants and nutrients from a fluid

Patent metadata

Field	Value
Publication number	US-2025051195-A1
Application number	US-202218721969-A
Country	US
Kind code	A1
Filing date	Dec 21, 2022
Priority date	Dec 27, 2021
Publication date	Feb 13, 2025
Grant date	—

Abstract

A method of removing charged contaminants from a fluid is provided. The method may include providing a filtration membrane in a fluid passageway, flowing a fluid through the fluid passageway and through the filtration membrane, and generating an electromagnetic field within the passageway at a location upstream from the filtration membrane to pretreat the fluid prior to the filtration membrane to enable the charged contaminants to precipitate out of solution. The method may further include generating an electric field across the filtration membrane at an amount effective to separate and degrade the charged contaminants on a first side of the filtration membrane. Methods of removing charged nutrients from a fluid are also provided.

First claim

1 . A method of removing charged contaminants from a fluid, the method comprising:
providing a filtration membrane in a fluid passageway; flowing a fluid through the fluid passageway and through the filtration membrane; generating an electromagnetic field within the passageway at a location upstream from the filtration membrane to pretreat the fluid prior to the filtration membrane to enable the charged contaminants to precipitate out of solution; and generating an electric field across the filtration membrane at an amount effective to separate and degrade the charged contaminants on a first side of the filtration membrane.

2 . The method of claim 1 , wherein the electric field generated across the filtration membrane is an oscillating electric field.

3 . The method of claim 1 , wherein generating the electric field across the filtration membrane includes:
generating a first electric field configured to separate the charged contaminants on the first side of the membrane; and generating a second electric field configured to degrade the charged contaminants, wherein the second electric field is greater than the first electric field.

4 . The method of claim 3 , wherein the first electric field is less than 3.0 volts.

5 . The method of claim 4 , wherein the second electric field is greater than 3.0 volts.

6 . The method of claim 1 , wherein the filtration membrane is configured as a cross flow membrane.

7 . The method of claim 1 , wherein the charged contaminants separated and degraded on the first side of the filtration membrane include per- and polyfluoroalkyl substances (PFAS).

8 . The method of claim 1 , wherein the charged contaminants separated and degraded on the first side of the filtration membrane include Escherichia coli.

9 . The method of claim 1 , wherein the fluid includes a water source.

10 . The method of claim 1 , wherein generating the electric field across the filtration membrane includes electro-oxidation.

11 . The method of claim 1 , wherein generating the electric field across the filtration membrane includes electro-sorption oxidation.

12 . A portable unit, configured to be deployed to a wastewater system to separate charged contaminants from the wastewater system, wherein the portable unit is configured to perform the method recited in claim 1 .

13 . (canceled)

14 . A method of removing charged nutrients from a fluid, the method comprising:
providing a filtration membrane in a fluid passageway; flowing a fluid through the fluid passageway and through the filtration membrane; generating an electromagnetic field within the passageway at a location upstream from the filtration membrane to pretreat the fluid prior to the filtration membrane to enable the charged nutrients to precipitate out of solution; generating an oscillating electric field across the filtration membrane at an amount effective to separate the charged nutrients on a first side of the filtration membrane; and wherein the relative supersaturation of the fluid is at least 1.

15 . The method recited in claim 14 , wherein the relative supersaturation of the fluid is between about 1.0 and 3.0.

16 . The method recited in claim 14 , wherein the pH level of the fluid increases when the oscillating electric field is generated.

17 . The method of claim 16 , wherein the pH level of the fluid decreases when the oscillating electric field is off.

18 . The method of claim 14 , wherein the temperature of the fluid increases when the oscillating electric field is generated.

19 . The method of claim 18 , wherein the temperature of the fluid decreases when the oscillating electric field is off.

20 . The method of claim 14 , wherein the induction time to separate the charged nutrients on the first side of the membrane is at least 70% less with the oscillating electric field.

21 . The method of claim 14 , wherein the charged nutrients separated on the first side of the filtration membrane include phosphorous.

22 - 23 . (canceled)

Assignees

• Univ Of Vermont And State Agricultural College
• City Of Essex Junction

Inventors

• Badireddy Appala Raju
• Jutras James
• Khan Kamruzzaman

Classifications

• C02F1/461

  by electrolysis · CPC title

• C02F1/469

  by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis · CPC title

• C02F2201/46115

  Electrolytic cell with membranes or diaphragms · CPC title

• C02F2303/04

  Disinfection · CPC title

• C02F2201/48

  Devices for applying magnetic or electric fields · CPC title