Fluid purification methods, devices, and systems

Patent metadata

Field	Value
Publication number	US-10189727-B2
Application number	US-201615187689-A
Country	US
Kind code	B2
Filing date	Jun 20, 2016
Priority date	Dec 13, 2011
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A fluid purification system has cells whose purifying capability can be regenerated. Some of the cells are arranged in series to reach a high level of purification. An automatic valve network is controlled to cycle the cells in a way that levels the loads on each, thereby maximizing the service interval for replacing expired cells, enabling all of the cells to be replaced at the same time after having each contributing approximately equally to the purification load, and operated such that at any one time, at least one cell is regenerated so as to enable continuous up-time.

First claim

What is claimed is:

1. A water purification system, comprising:
a plurality of cells, each cell of the plurality of cells including a water purification element;
a valving network including valves and fluid conduits fluidly interconnecting said plurality of cells; and
a controller connected to the valving network to permit the controller to operate said valves,
wherein the valving network further includes
a source water inlet,
a drain outlet, and
a product water outlet,

wherein the valving network is configurable by the controller, by operation of the valves, to form selected interconnections between and among selected ones of the cells to define a flow channel from a selected one of
the source water inlet,
the drain outlet, and
the product water outlet,

through said selected ones of said cells, to a selected other of said selected one of
the source water inlet,
the drain outlet, and
the product water outlet,

wherein the controller is configured to, during a first time period, open and close valves of the valving network
to define a first continuous flow channel from the source water inlet, through a first filtering group of two or more of the cells in series to the product water outlet, and
to define a second continuous flow channel from the product water outlet through a first regenerating group of one or more of the cells to the drain outlet, whereby the first filtering group filters water to produce product water while the first regenerating group is regenerated by a portion of the product water flowing through the one or more of the cells of the first regenerating group in a reversed flow direction,

wherein the controller is further configured to, during a second time period, open and close the valves of the valving network
to define a third continuous flow channel from the source water inlet through a second filtering group of two or more of the cells in series to the product water outlet, and
to define a fourth continuous flow channel from the product water outlet through a second regenerating group of one or more of the cells to the drain outlet, whereby the second filtering group filters water to produce the product water while the second regenerating group of one or more of the cells is regenerated by a portion of the product water flowing through the one or more of the cells of the second regenerating group in the reversed flow direction,

wherein the first and second time periods are at different times, the second filtering group of two or more of the cells is different from the first filtering group of two or more of the cells, and the second regenerating group of one or more of the cells is different from the first regenerating group of one or more of the cells,
wherein a first cell of the first filtering group receives water directly from the source water inlet and a second cell of the first filtering group receives water directly from the first cell,
wherein the first cell of the first filtering group is included in the second regenerating group of one or more of the cells and the second cell of the first filtering group receives water directly from the source water inlet during the second time period, and
the cells are electronic deionization cells.

2. The system of claim 1 , wherein:
the controller is further configured to, during a third time period, open and close the valves of the valving network
to define the first continuous flow channel from the source water inlet through the first filtering group to the product water outlet and
to define the second continuous flow channel from the product water outlet through the first regenerating group to the drain outlet, whereby the first filtering group filters water to produce the product water while the first regenerating group is regenerated;

wherein the controller is further configured to, during a fourth time period, open and close the valves of the valving network
to define the third continuous flow channel from the source water inlet through the second filtering group to the product water outlet and
to define the fourth continuous flow channel from the product water outlet through the second regenerating group to the drain outlet, whereby the second filtering group filters water to produce the product water while the second regenerating group is regenerated; and

the first, second, third and fourth time periods are different from each other.

3. The system of claim 2 , wherein
the controller is further configured to open and close the valves of the valving network at additional time periods, and
over a totality of said additional time periods, a cumulative time period during which each of the cells is in a first serial position of said two or more of the cells in series between the source water inlet and the product water outlet is the same, whereby each of said cells has a substantially identical filtering load over said cumulative time period.

4. The system of claim 1 , wherein at least one cell of the first filtering group is also a part of the second filtering group.

5. A water purification system, comprising:
a plurality of cells, each cell of the plurality of cells including a water purification element;
a valving network including valves and fluid conduits fluidly interconnecting said plurality of cells; and
a controller connected to the valving network to permit the controller to operate said valves,
wherein the valving network further includes
a source water inlet, a drain outlet, and a product water outlet,

wherein the valving network is configurable by the controller, by operation of the valves, to form selected interconnections between and among selected ones of the cells to define a flow channel from a selected one of
the source water inlet,
the drain outlet, and
the product water outlet,
through said selected ones of said cells, to a selected other of said selected one of the source water inlet,
the drain outlet, and
the product water outlet,
wherein the controller is configured to, during a first time period, open and close valves of the valving network to define a first continuous flow channel from the source water inlet, through a first filtering group of two or more of the cells in series to the product water outlet, and

to define a second continuous flow channel from the product water outlet through a first regenerating group of one or more of the cells to the drain outlet, whereby the first filtering group filters water to produce product water while the first regenerating group is regenerated by at least a portion of said product water,
wherein the controller is further configured to, during a second time period, open and close the valves of the valving network to define a third continuous flow channel from the source water inlet through a second filtering group of two or more of the cells in series to the product water outlet, and

to define a fourth continuous flow channel from the product water outlet through a second regenerating group of one or more of the cells to the drain outlet, whereby the second filtering group filters water to produce the product water while the second regenerating group of one or more of the cells is regenerated by at least a portion of said product water,
wherein the first and second time periods are at different times, the second filtering group of two or more of the cells is different from the first filtering group of two or more of the cells, and the second regenerating group of one or more of the cells is different from the first regenerating group of one or more of the cells, and
wherein the cells are electronic deionization cells.

6. The system of claim 5 , wherein:
the controller is further configured to, during a third time period, open and close the valves of the valving network
to define

Assignees

• Nxstage Medical Inc

Inventors

• Weigel William K
• Friederichs Goetz
• Turk Joseph E
• Hover Sr Jefferey B

Classifications

• B01D2321/04

  Backflushing · CPC title

• C02F1/008

  Control or steering systems not provided for elsewhere in subclass C02F · CPC title

• C02F1/32

  with ultraviolet light · CPC title

• C02F2301/08

  Multistage treatments, e.g. repetition of the same process step under different conditions · CPC title

• C02F1/441

  by reverse osmosis · CPC title