Flocculation basin inclusion or exclusion type water treatment apparatus using dissolved air flotation

Patent metadata

Field	Value
Publication number	US-9839918-B2
Application number	US-201514679308-A
Country	US
Kind code	B2
Filing date	Apr 6, 2015
Priority date	Apr 7, 2014
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

Disclosed herein is a flocculation basin inclusion ion type water treatment apparatus using dissolved air floatation which includes: a flocculation basin which forms flocs by mixing a coagulant inserted into feed water and grows up the flocs; a contact zone to which fine bubbles are induced through a nozzle disposed at a lower part; and a separation zone which removes the flocs when the fine bubbles are attached to the flocs and the flocs float on the surface of water, the flocculation basin inclusion type water treatment apparatus including: a fine bubble forming part configured to separate a portion of the feed water at an upstream side of the flocculation basin by piping, configured to form saturated water using the separated portion of the feed water and configured to supply the saturated water to the nozzle.

First claim

What is claimed is:

1. A flocculation basin inclusion type water treatment apparatus using dissolved air floatation (DAF) which includes: a flocculation basin which forms flocs by mixing a coagulant inserted into feed water and grows up the flocs; a contact zone to which fine bubbles are induced through a nozzle disposed at a lower part; and a separation zone which removes the flocs when the fine bubbles are attached to the flocs and the flocs float on the surface of water, the flocculation basin inclusion type water treatment apparatus comprising:
a fine bubble forming part configured to separate a portion of the feed water at an upstream side of the flocculation basin by piping, configured to form saturated water using the separated portion of the feed water and configured to supply the saturated water to the nozzle.

2. The water treatment apparatus according to claim 1 , wherein the fine bubble forming part comprises:
an intake pipe configured to supply air to the separated portion of the feed water;
a mixing pump configured to pump the air and the separated portion of the feed water; and
a saturator configured to saturate the air supplied to the pumped feed water.

3. The water treatment apparatus according to claim 2 , wherein the fine bubble forming part further comprises:
an adjuvant injection part configured to supply an adjuvant to make the fine bubbles have positive charges.

4. The water treatment apparatus according to claim 3 , wherein the adjuvant injection part is disposed on a pipe provided at an upstream side of the intake pipe.

5. The water treatment apparatus according to claim 3 , wherein the adjuvant injection part is disposed on a pipe provided between the intake pipe and the mixing pump.

6. The water treatment apparatus according to claim 3 , wherein the adjuvant injection part is disposed on a pipe provided between the mixing pump and the saturator.

7. The water treatment apparatus according to claim 2 , wherein the fine bubble forming part further comprises:
a strainer configured to remove solid matters through pretreatment of the separated portion of the feed water.

8. The water treatment apparatus according to claim 1 , wherein the fine bubble forming part comprises:
a mixing pump configured to pump the separated portion of the feed water;
a saturator configured to saturate air pumped to the portion of feed water; and
an air compressor configured to supply compressed air to the saturator.

9. The water treatment apparatus according to claim 8 , wherein the fine bubble forming part further comprises:
an adjuvant injection part configured to supply an adjuvant to make the fine bubbles have positive charges.

10. The water treatment apparatus according to claim 9 , wherein the adjuvant injection part is disposed on a pipe of an upstream side of the mixing pump.

11. The water treatment apparatus according to claim 9 , wherein the adjuvant injection part is disposed on a pipe provided between the mixing pump and the saturator.

12. The water treatment apparatus according to claim 8 , wherein the saturator comprises:
a chamber comprising a first flow path in which a first fluid flows; and
a porous tube body arranged inside the chamber, extending in a parallel direction with the first flow path and comprising a second flow path in which a second fluid flows,
wherein the first fluid and the second fluid are compressed air and the pumped feed water, respectively or the pumped feed water and compressed air, respectively, and
wherein the porous tube body is configured to prevent the pumped feed water from passing and configured to allow passing of the compressed air.

13. A flocculation basin exclusion type water treatment apparatus using dissolved air floatation (DAF) which includes: a contact zone to which fine bubbles are supplied through a nozzle disposed at a lower part and which supplies the fine bubbles to flocs formed in feed water to which a coagulant is mixed; and a separation zone which removes the flocs when the fine bubbles are attached to the flocs and the flocs float on the surface of water, the flocculation basin exclusion type water treatment apparatus comprising:
a fine bubble forming part configured to separate a portion of the feed water at an upstream side of the flocculation basin by piping, configured to form saturated water using the separated portion of the feed water and configured to supply the saturated water to the nozzle,
wherein the nozzle comprises:
a housing which is formed in a tube shape and has an inlet formed at a first side and an outlet formed at a second side opposite from the first side;
a nozzle connection part which is joined to the inlet and has an inflow duct formed in a longitudinal direction; and
a nozzle body which is inserted and mounted into the housing and comprises:
a collision part formed at a first half part to change a flow direction of fluid induced along the inflow duct to collide with an inner wall of the housing,
a plurality of cut portions formed in a side of the nozzle body to form a plurality of side flow paths between the nozzle body and the inner wall of the housing,
a spurt hole provided at a second half part opposite to the first half part,
a collision plate provided in the spurt hole, and
an orifice provided between a cut portion of the plurality of cut portions and the spurt hole, such that fluid sprayed through the orifice collides against the collision plate.

14. The water treatment apparatus according to claim 13 , wherein the fine bubble forming part comprises:
an intake pipe configured to supply air to the separated portion of the feed water;
a mixing pump configured to pump the supplied air and the separated portion of the feed water; and
a saturator configured to saturate the supplied air pumped to the separated portion of the feed water.

15. The water treatment apparatus according to claim 14 , wherein the fine bubble forming part further comprises:
an adjuvant injection part configured to supply an adjuvant to make the fine bubbles have positive charges.

16. The water treatment apparatus according to claim 14 , wherein the fine bubble forming part further comprises:
a strainer configured to remove solid matters through pretreatment of the separated portion of the feed water.

Assignees

• Doosan Heavy Ind & Construction Co Ltd

Inventors

• Park Sung Won
• Park Byung Sung

Classifications

• C02F2303/24

  Separation of coarse particles, e.g. by using sieves or screens · CPC title

• C02F2301/043

  Treatment of partial or bypass streams · CPC title

• B03D1/24

  Pneumatic {(mixing gases or vapours with liquids B01F23/20)} · CPC title

• C02F1/5281

  Installations for water purification using chemical agents · CPC title

• C02F1/56

  Macromolecular compounds · CPC title