Fluid purification methods, devices, and systems

• US 10,189,727 B2
• Filed: 06/20/2016
• Issued: 01/29/2019
• Est. Priority Date: 12/13/2011
• Status: Active Grant

• Current Assignee: Nxstage Medical Incorporated (Fresenius SE & Co. KGaA)
• Original Assignee: Nxstage Medical Incorporated (Fresenius SE & Co. KGaA)
• Inventors: Weigel, William K, Friederichs, Goetz, Turk, Joseph E, Hover, Sr., Jefferey B
• Primary Examiner(s): Zalasky, Katherine
• Application Number:
  US15/187,689
• Publication Number:
  US 20170001887A1
• Time in Patent Office: 953 Days
• CPC Class Codes: B01D 2317/02 Elements in series
• CPC Class Codes: B01D 2321/04 Backflushing
• CPC Class Codes: B01D 2321/12 Use of permeate
• CPC Class Codes: B01D 61/428 Membrane capacitive deionization
• CPC Class Codes: B01D 61/52 Accessories; Auxiliary operation
• CPC Class Codes: B01D 61/54 Controlling or regulating
• CPC Class Codes: B01D 65/02 Membrane cleaning or sterilisation ; Membrane regeneration
• CPC Class Codes: C02F 1/006 Water distributors either inside a treatment tank or directing the water to several treatment tanks; Water treatment plants incorporating these distributors, with or without chemical or biological tanks for settling tanks B01D21/24
• CPC Class Codes: C02F 1/008 Control or steering systems not provided for elsewhere in subclass C02F
• CPC Class Codes: C02F 1/32 with ultraviolet light
• CPC Class Codes: C02F 1/441 by reverse osmosis
• CPC Class Codes: C02F 1/444 by ultrafiltration or microfiltration
• CPC Class Codes: C02F 1/4695 electrodeionisation
• CPC Class Codes: C02F 2201/46115 Electrolytic cell with membranes or diaphragms
• CPC Class Codes: C02F 2201/4613 Inversing polarity
• CPC Class Codes: C02F 2201/46145 Fluid flow
• CPC Class Codes: C02F 2209/003 Downstream control, i.e. outlet monitoring, e.g. to check the treating agents, such as halogens or ozone, leaving the process
• CPC Class Codes: C02F 2209/005 Processes using a programmable logic controller [PLC]
• CPC Class Codes: C02F 2209/40 Liquid flow rate
• CPC Class Codes: C02F 2301/08 Multistage treatments, e.g. repetition of the same process step under different conditions
• CPC Class Codes: C02F 2303/16 : Regeneration of sorbents, filters
• CPC Class Codes: Y10T 137/8593 : Systems

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.

Claims

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 the first continuous flow channel from the source water inlet through the first filtering group of two or more of the cells in series to the product water outlet and

to define the second continuous flow channel from the product water outlet through the first regenerating group of one or more of the cells to the drain outlet, whereby the first filtering group of two or more of the cells in series filters water to produce the product water while the first regenerating group of one or more of the cells 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 of two or more of the cells in series to the product water outlet and

to define the fourth continuous flow channel from the product water outlet through the second regenerating group of one or more of the cells to the drain outlet, whereby the second filtering group of two or more of the cells in series filters water to produce the product water while the second regenerating group of one or more of the cells is regenerated; and

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

7. The system of claim 6, wherein at least one cell of the first filtering group is also a part of the second filtering group.

8. The system of claim 7, 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.