US-12623167-B2 - Water purification system and method

US12623167B2US 12623167 B2US12623167 B2US 12623167B2US-12623167-B2

Abstract

The embodiments provided herein relate to a water purification system and method utilizing a filter cartridge comprising a plurality of filter wafers stacked to form a plurality of channels for unfiltered water to flow through for purification. The water purification system is configured to utilize the exclusion zone phenomenon to separate impurities from water using hydrophilic surfaces and trifurcations to divert pure water from impurities. The filter cartridge comprising a plurality of filter wafers may be received by a water receptacle to provide a low-energy water purification system.

Inventors

Kaustubh Chilwarwar

Assignees

Kaustubh Chilwarwar

Dates

Publication Date: 20260512
Application Date: 20230809

Claims (20)

1 . A system to purify water comprising: a plurality of filter wafers, wherein a filter wafer comprises: a plurality of first channels extending from a proximal end of the filter wafer toward a distal end of the filter wafer, each of the first channels comprising a first sidewall and a second sidewall; and a plurality of trifurcations, wherein a trifurcation is provided at a distal end of each of the first channels, each trifurcation dividing the first channel into a second channel, a third channel, and a fourth channel, wherein the fourth channel is parallel to the first channel, and wherein the second channel and the third channel are provided through a body of the filter wafer, wherein each of the first channel, the second channel, the third channel, and the fourth channel comprise hydrophilic surfaces; and wherein unfiltered water enters the plurality of first channels of the plurality of filter wafers and purified water is diverted from each first channel into the second channel and the third channel.
2 . The system of claim 1 , wherein the plurality of filter wafers is anodically bonded together to form a filter stack via at least one of hermetically sealing hydrophilic adhesive, annealing using sputtered titanium, direct silicon fusion bonding, or thermal compression bonding.
3 . The system of claim 2 , further comprising a bottom cover provided on a bottom of the filter stack, and wherein the bottom cover comprises a cutout to receive purified water from a plurality of second channels and third channels of the filter stack.
4 . The system of claim 3 , wherein a plurality of the second channels and the third channels of each filter wafer form purified water channels through the filter stack, and wherein the purified water channels run orthogonally relative to the plurality of first channels.
5 . The system of claim 4 , further comprising a top cover provided on a top of the filter stack.
6 . The system of claim 5 , wherein the bottom cover and the top cover are anodically bonded to the filter stack to form a filter cartridge via at least one of hermetically sealing hydrophilic adhesive, annealing using sputtered titanium, direct silicon fusion bonding, or thermal compression bonding.
7 . The system of claim 6 , wherein the plurality of filter wafers, the top cover, and the bottom cover comprise at least one of silicon wafers or, glass substrates.
8 . The system of claim 2 , wherein the filter stack is hermetically sealed with a hydrophilic adhesive, annealing using sputtered titanium, direct silicon fusion bonding, or thermal compression bonding.
9 . The system of claim 1 , wherein impure water is diverted from the first channel into the fourth channel.
10 . The system of claim 9 , wherein the impure water exits an impure water outlet formed by distal ends of a plurality of the fourth channels.
11 . The system of claim 1 , wherein the trifurcation comprises a first diversion channel in fluid communication with the second channel and a second diversion channel in fluid communication with the third channel.
12 . The system of claim 11 , wherein the first diversion channel and the second diversion channel each form an angle of at least one of 1 to 30 degrees, 30 to 60 degrees, 60 to 90 degrees, 90 to 120 degrees, 120 to 150 degrees, or 150 to 179 degrees with the first channel.
13 . The system of claim 11 , wherein the first and second diversion channels comprise a width of at least one of approximately 1 to 10, 10 to 60, 60 to 100, or 100 to 200 microns.
14 . The system of claim 1 , wherein the first channel comprises a width of approximately 200 to 600 microns.
15 . The system of claim 14 , wherein the fourth channel comprises a width of approximately 140 to 500 microns.
16 . A system to purify water, comprising: a plurality of filter wafers, a filter wafer comprising: a plurality of first channels extending from a proximal end of the filter wafer toward a distal end of the filter wafer, each of the first channels comprising a first sidewall and a second sidewall, wherein the first and second sidewalls comprise a hydrophilic surface; and a plurality of trifurcations, wherein a trifurcation is provided at a distal end of each of the first channels, each trifurcation dividing the first channel into a second channel, a third channel, and a fourth channel, wherein the fourth channel is parallel to the first channel, and wherein the second channel and the third channel are provided through a body of the filter wafer, wherein unfiltered water enters the plurality of first channels of the plurality of filter wafers and purified water is diverted from each first channel into the second channel and the third channel; and a water receptacle to receive the plurality of filter wafers and direct the unfiltered water to the plurality of first channels of the plurality of filter wafers.
17 . The system of claim 16 , wherein the water receptacle provides the unfiltered water to the plurality of first channels at a pressure head of at least 15 cm to 2 meters.
18 . The system of claim 16 , further comprising a bottom cover provided on a bottom of the plurality of filter wafers, wherein the bottom cover comprises a cutout providing an outlet for purified water received from a plurality of second channels and third channels, and wherein the outlet is provided outside a body of the water receptacle when the plurality of filter wafers is received by the water receptacle.
19 . The system of claim 18 , further comprising a top cover provided on a top of the plurality of filter wafers, wherein the plurality of filter wafers, the bottom cover, and the top cover are via at least one of anodically bonded, hermetically sealing hydrophilic adhesive, annealing using sputtered titanium, direct silicon fusion bonding, or thermal compression bonding to form a filter cartridge, and wherein the water receptacle receives the filter cartridge.
20 . The system of claim 18 , further comprising a top cover provided on a top of the plurality of filter wafers, wherein the plurality of filter wafers, the bottom cover, and the top cover are hermetically sealed with a hydrophilic adhesive, annealing using sputtered titanium, direct silicon fusion bonding, or thermal compression bonding.

Description

TECHNICAL FIELD The present invention is generally related to a water purification system for removing impurities from water. BACKGROUND Low-cost, near-zero energy filtration of water for potability that is available to municipalities and the masses may become increasingly important as the population grows and water, as a resource, becomes scarcer. Previous water filtration systems, including reverse osmosis and distillation, require large amounts of energy and/or expensive filters to remove impurities from water. It would be desirable to provide a lower cost, and near zero energy, water filtration system which is affordable for municipalities and the masses. Further, it may be desirable to provide a low-cost, low-energy desalination system, such that the vast amount of water available from the oceans can be tapped into as a water resource without worrying about energy/electricity infrastructure to support the purification functions. Additionally, a system with low or no instances of fouling or which does not require frequent replacement of modules due to clogging would be desirable, and in particular, for desalination purposes so that ocean waters may be relied upon as a fresh water source without worrying about energy infrastructure to support the purification functions, fouling, and constant replacement of modules due to clogging. Thus, there exists a need for water purification systems that improve upon and advance the design of known water purification systems. Examples of new and useful water purification systems relevant to the needs existing in the field are discussed below. SUMMARY OF THE INVENTION This summary is provided to introduce a variety of concepts in a simplified form that is disclosed further in the detailed description of the embodiments. This summary is not intended to identify key or essential inventive concepts of the claimed subject matter, nor is it intended for determining the scope of the claimed subject matter. The embodiments provided herein relate to a system and method for water purification. In some embodiments, the system to purify water comprises: a plurality of filter wafers, wherein a filter wafer comprises: a plurality of first channels extending from a proximal end of the filter wafer toward a distal end of the filter wafer, each of the first channels comprising a first sidewall and a second sidewall; and a plurality of trifurcations, wherein a trifurcation is provided at a distal end of each of the first channels, each trifurcation dividing the first channel into a second channel, a third channel, and a fourth channel, wherein the fourth channel is parallel to the first channel, and wherein the second channel and the third channel are provided through a body of the filter wafer, wherein each of the first channel, the second channel, the third channel, and the fourth channel comprise hydrophilic surfaces; and wherein unfiltered water enters the plurality of first channels of the plurality of filter wafers and purified water is diverted from each first channel into the second channel and the third channel. In some embodiments, the plurality of filter wafers is anodically bonded together to form a filter stack. In some embodiments, the system further comprises a bottom cover provided on a bottom of the filter stack, and wherein the bottom cover comprises a cutout to receive purified water from a plurality of second channels and third channels of the filter stack. In some embodiments, a plurality of the second channels and the third channels of each filter wafer form purified water channels through the filter stack, and wherein the purified water channels run orthogonally relative to the plurality of first channels. In some embodiments, the system further comprises a top cover provided on a top of the filter stack. In some embodiments, the bottom cover and the top cover are anodically bonded to the filter stack to form a filter cartridge. In some embodiments, the plurality of filter wafers, the top cover, and the bottom cover comprise silicon wafers or glass substrates. In some embodiments, the filter stack is hermetically sealed with a hydrophilic adhesive, annealing using sputtered titanium, direct silicon fusion bonding, or thermal compression bonding. In some embodiments, impure water is diverted from the first channel into the fourth channel. In some embodiments, the impure water exits an impure water outlet formed by distal ends of a plurality of the fourth channels. In some embodiments, the trifurcation comprises a first diversion channel in fluid communication with the second channel and a second diversion channel in fluid communication with the third channel. In some embodiments, the first diversion channel and the second diversion channel each form an angle of 1 to 30 degrees, 30 to 60 degrees, 60 to 90 degrees, 90 to 120 degrees, 120 to 150 degrees, or 150 to 179 degrees, with the first channel depending on the complexity and precisions of the microfabrication