MEMBRANE FILTRATION SYSTEM AND MEMBRANE BIOREACTOR INCLUDING THE SAME

• US 20180147537A1
• Filed: 07/21/2017
• Published: 05/31/2018
• Est. Priority Date: 11/30/2016
• Status: Active Grant

• Current Assignee: Doosan Enerbility Company Limited (Doosan Heavy Industries and Construction Company Limited)
• Original Assignee: Doosan Heavy Industries Construction Co., Ltd.
• Inventors: LEE, Woo Nyoung
• Granted Patent: US 10,668,433 B2
• Time in Patent Office: Days
• CPC Class Codes: B01D 2313/06 External membrane module supporting or fixing means
• CPC Class Codes: B01D 2313/12 Specific discharge elements
• CPC Class Codes: B01D 2313/14 Specific spacers
• CPC Class Codes: B01D 2313/2031 Frame or cage-like structures
• CPC Class Codes: B01D 2313/60 Specific sensors or sensor arrangements
• CPC Class Codes: B01D 2315/04 Reciprocation, oscillation or vibration
• CPC Class Codes: B01D 2315/06 Submerged-type; Immersion type
• CPC Class Codes: B01D 61/18 Apparatus therefor
• CPC Class Codes: B01D 61/22 Controlling or regulating
• CPC Class Codes: B01D 63/16 Rotary, reciprocated or vibrated modules
• CPC Class Codes: B01D 65/08 Prevention of membrane fouling or of concentration polarisation
• CPC Class Codes: C02F 2203/006 details of construction, e.g. specially adapted seals, modules, connections
• CPC Class Codes: C02F 3/1268 Membrane bioreactor systems
• CPC Class Codes: C02F 3/1273 Submerged membrane bioreactors
• CPC Class Codes: C02F 3/2853 using anaerobic membrane bioreactors
• CPC Class Codes: Y02W 10/10 Biological treatment of water, waste water, or sewage

Abstract

A membrane filtration system, capable of effectively removing foreign matter attached to a separation membrane while saving energy by reciprocating the separation membrane, includes a treatment bath, a membrane support frame disposed in the treatment bath, a separation membrane module installed in the membrane support frame, a reciprocating part connected with the membrane support frame to reciprocate the membrane support frame, and a sludge floating part disposed on a lower end of the membrane support frame to float sludge accumulated in the treatment bath, and a filtered-water discharge part discharging filtered water that has been filtered via the separation membrane module. The filtered-water discharge part is formed to be movable or stretchable in response to a reciprocating motion of the membrane support frame.

Claims

1. A membrane filtration system, comprising:

a treatment bath;

a membrane support frame disposed in the treatment bath;

a separation membrane module installed in the membrane support frame;

a reciprocating part connected with the membrane support frame to reciprocate the membrane support frame;

a sludge floating part disposed on a lower end of the membrane support frame to float sludge accumulated in the treatment bath; and

a filtered-water discharge part discharging water that has been filtered via the separation membrane module,

wherein the filtered-water discharge part is configured to be movable or stretchable in response to a reciprocating motion of the membrane support frame.

2. The membrane filtration system according to claim 1, wherein the separation membrane module comprises an upper frame, a lower frame, and a separation membrane provided between the upper frame and the lower frame.

3. The membrane filtration system according to claim 2, wherein a sump is provided in the upper frame, and the sump and a separation portion of the separation membrane are in fluid communication with each other.

4. The membrane filtration system according to claim 3, wherein a plurality of the separation membrane modules is installed in the membrane support frame.

5. The membrane filtration system according to claim 3, wherein the filtered-water discharge part comprises:

a water collection pipe configured to collect the filtered water from at least one separation membrane module; and

a recovery pipe slidably or stretchably coupled to the water collection pipe to recover the filtered water to an outside.

6. The membrane filtration system according to claim 5, wherein the recovery pipe comprises:

a first recovery pipe connected to the water collection pipe made of a rigid material; and

a second recovery pipe connected to the first recovery pipe made of a pliable material.

7. The membrane filtration system according to claim 6, wherein a suction pump is connected to the second recovery pipe to pump the filtered water.

8. The membrane filtration system according to claim 6, wherein an upper side of the upper frame includes a discharge hole via which the water collection pipe is in fluid communication with the sump.

9. The membrane filtration system according to claim 3, further comprising:

a filtration pipe disposed in the membrane support frame,

wherein a plurality of the separation membrane modules is coupled to the filtration pipe.

10. The membrane filtration system according to claim 9, wherein the filtration pipe includes a plurality of coupling holes, each of the plurality of coupling holes coupled to a respective end of the upper frame, whereby the sump and the filtration pipe are in fluid communication with each other.

11. The membrane filtration system according to claim 10, wherein the filtration pipe is disposed on a central portion of an upper side of the membrane support frame, and the plurality of separation membrane modules is symmetrically coupled to both sides of the filtration pipe.

12. The membrane filtration system according to claim 9, wherein the filtration pipe is arranged to be perpendicular to a reciprocating direction of the membrane support frame.

13. The membrane filtration system according to claim 10, wherein the filtered-water discharge part comprises:

a recovery pipe slidably or stretchably coupled to the filtration pipe to recover the filtered water to an outside.

14. The membrane filtration system according to claim 13, wherein the recovery pipe comprises:

a first recovery pipe connected to the filtration pipe made of a rigid material; and

a second recovery pipe connected to the first recovery pipe and made of a pliable material.

15. The membrane filtration system according to claim 14, wherein a suction pump is connected to the second recovery pipe to pump the filtered water.

16. The membrane filtration system according to claim 2, wherein each of the upper and the lower frames comprises an interval maintaining part protruding from each of the upper and the lower frames.

17. The membrane filtration system according to claim 16, wherein the interval maintaining part comprises a coupling part operable to couple the interval maintaining part to another interval maintaining part.

18. The membrane filtration system according to claim 2, wherein the separation membrane includes hollow fibers arranged in a plurality of bundles, the respective bundles being spaced apart from each other.

19. The membrane filtration system according to claim 2, wherein a length of the hollow fiber membrane is greater than a distance (Lo) between the upper frame and the lower frame and less than or equal to (Lo+0.1(Lo)).

20. A membrane bioreactor, comprising:

a biological treatment train performing at least one biological treatment process among anaerobic, anoxic and aerotropic processes; and

a membrane filtration system comprising

a treatment bath;

a membrane support frame disposed in the treatment bath;

a separation membrane module installed in the membrane support frame;

a reciprocating part connected with the membrane support frame to reciprocate the membrane support frame;

a sludge floating part disposed on a lower end of the membrane support frame to float sludge accumulated in the treatment bath; and

a filtered-water discharge part discharging water that has been filtered via the separation membrane module,

wherein the filtered-water discharge part is configured to be movable or stretchable in response to a reciprocating motion of the membrane support frame.