Filtration system and method for chemical rinsing a filtration system

• US 10,639,590 B2
• Filed: 09/15/2016
• Issued: 05/05/2020
• Est. Priority Date: 09/18/2015
• Status: Active Grant

• Current Assignee: DuPont Safety & Construction, Inc. (DuPont de Nemours, Inc.)
• Original Assignee: DuPont Safety & Construction, Inc. (DuPont de Nemours, Inc.)
• Inventors: Staaks, Christian, Berg, Peter
• Primary Examiner(s): Nguyen, Nam X
• Assistant Examiner(s): Miller-Cruz, Ekandra S.
• Application Number:
  US15/760,784
• Publication Number:
  US 20180250638A1
• Time in Patent Office: 1,328 Days
• Field of Search: 21032172, 21032178, 21032179, 2101952, 21032169, 210501, 210636, 210650, 210652
• CPC Class Codes: B01D 2317/04 Elements in parallel
• CPC Class Codes: B01D 2321/04 Backflushing
• CPC Class Codes: B01D 2321/16 Use of chemical agents
• CPC Class Codes: B01D 2321/162 Use of acids
• CPC Class Codes: B01D 2321/164 Use of bases
• CPC Class Codes: B01D 61/18 Apparatus therefor
• CPC Class Codes: B01D 61/20 Accessories; Auxiliary operations
• CPC Class Codes: B01D 65/02 Membrane cleaning or sterilisation ; Membrane regeneration
• CPC Class Codes: C02F 1/44 by dialysis, osmosis or reverse osmosis general membrane separation processes B01D61/00, membrane modules B01D63/00, electrodialysis C02F1/4693, combination of membrane modules and bioreactors C02F3/1268
• CPC Class Codes: C02F 1/444 by ultrafiltration or microfiltration
• CPC Class Codes: C02F 2303/16 Regeneration of sorbents, filters

Abstract

A filtration system for liquid, particularly raw water, having at least one filtration module for filtering the liquid, a first inlet pipe for feeding liquid to the filtration module, a second inlet pipe for feeding liquid to the filtration module and at least one outlet pipe for discharging filtrate from the filtration module. A cleaning branch is arranged between the first inlet pipe and the second inlet pipe, and at least one dosing feeder for adding a cleaning chemical is connected to the cleaning branch. Additionally, a method for chemically rinsing such a filtration, wherein a cleaning chemical is added via a dosing feeder connected to a cleaning branch which is arranged between the first inlet pipe and the second inlet pipe.

Claims

1. A filtration system for liquid, comprising:

at least one filtration module for filtering the liquid,

a first inlet pipe for feeding liquid to the filtration module,

a second inlet pipe for feeding liquid to the filtration module and

at least one outlet pipe for discharging filtrate from the filtration module,

wherein

a first concentrate valve is arranged in the first inlet pipe,

a second concentrate valve is arranged in the second inlet pipe, and

a drain pipe, in which a drain valve is arranged, such that when the drain valve is open, the liquid and retentate can pass through the drain pipe and the drain valve out of an inlet compartment of the filtration module, is connected to the inlet pipes via a collecting pipe,

wherein

the first inlet pipe and the second inlet pipe are connected to the collecting pipe and the collecting pipe is connected to a feed pipe,

in which a feed valve is arranged, such that when the feed valve is open and one of the concentrate valves is open, liquid can pass through the feed pipe and one of the inlet pipes into the inlet compartment of the filtration module, and

a cleaning branch is arranged between the first inlet pipe and the second inlet pipe, wherein the cleaning branch is connected to the first inlet pipe in an area between the filtration module and the first concentrate valve, and wherein the cleaning branch is connected to the second inlet pipe in an area between the filtration module and the second concentrate valve, and

at least one dosing feeder for adding a cleaning chemical is connected to the cleaning branch, wherein the cleaning branch contains a circulation pump arranged in series with the at least one dosing feeder, and wherein the cleaning branch contains a cleaning valve arranged in series with the at least one dosing feeder.

2. The filtration system according to claim 1, wherein the cleaning branch contains at least a first dosing feeder for adding an alkaline cleaning agent and a second dosing feeder for adding an acid cleaning agent.

3. The filtration system according to claim 2, wherein the cleaning branch contains a third dosing feeder for adding a chlorine cleaning agent.

4. The filtration system according to claim 1, wherein the cleaning branch is connected to the first inlet pipe between the filtration module and the first concentrate valve, and is connected to the second inlet pipe between the filtration module and the second concentrate valve.

5. A method for chemical rinsing a filtration system for liquid, the method comprising:

filtering the liquid with at least one filtration module;

feeding liquid via a first inlet pipe to the filtration module;

feeding liquid via a second inlet pipe to the filtration module; and

discharging filtrate via at least one outlet pipe from the filtration module,

the method further comprising

performing a chemical rinsing operation by adding a cleaning chemical via a dosing feeder connected to a cleaning branch which is arranged between the first inlet pipe and the second inlet pipe,

opening a cleaning valve arranged in series with the dosing feeder to enable circulation of the cleaning chemical,

circulating the cleaning chemical through the cleaning branch and the filtration module via a circulation pump arranged in series with the dosing feeder, and

closing a first concentrate valve arranged in the first inlet pipe and a second concentrate valve arranged in the second inlet pipe before the cleaning chemical is added,

and after chemically rinsing operation, opening the first concentrate valve and the second concentrate valve, such that liquid comprising a cleaning chemical is discharged through the first inlet pipe and through the second inlet pipe that are connected to a collecting pipe,

wherein

a drain pipe is connected to the collecting pipe,

a drain valve is arranged in the drain pipe, such that when the drain valve is open, the liquid and retentate can pass through the drain pipe and the drain valve out of an inlet compartment of the filtration module, and

the cleaning branch is connected to the first inlet pipe in an area between the filtration module and the first concentrate valve, and the cleaning branch is connected to the second inlet pipe in an area between the filtration module and the second concentrate valve.

6. The method according to claim 5, wherein an alkaline cleaning agent is added via a first dosing feeder and an acid cleaning agent is added via a second dosing feeder, such that liquid in the filtration system is adjusted to a neutral pH value.

7. The method according to claim 5, wherein a chlorine cleaning agent is added via a third dosing feeder.

8. The method according to claim 5, comprising preparing a chemical rinsing operation by initially closing a feed valve and closing an outlet valve arranged in the outlet pipe, wherein

the feed valve is arranged a feed pipe, such that when the feed valve is open and one of the concentrate valves is open, liquid can pass through the feed pipe and one of the inlet pipes into the inlet compartment of the filtration module, wherein the collecting pipe is connected to the feed pipe.