Method and device for waste-water purification

• US 9,238,978 B2
• Filed: 08/31/2006
• Issued: 01/19/2016
• Est. Priority Date: 08/31/2006
• Status: Active Grant

• Current Assignee: Elcon Recycling Center (2003) Ltd.
• Original Assignee: Elcon Recycling Center (2003) Ltd.
• Inventors: Levin, Alexander
• Primary Examiner(s): Soohoo, Tony G
• Assistant Examiner(s): Keyworth, Peter
• Application Number:
  US12/438,950
• Publication Number:
  US 20100282592A1
• Time in Patent Office: 3,428 Days
• Field of Search: 210/750
• US Class Current: 1/1
• CPC Class Codes: B01D 3/04 pipe stills
• CPC Class Codes: B01D 3/103 by using a barometric column
• CPC Class Codes: C02F 1/048 Purification of waste water by evaporation
• CPC Class Codes: C02F 1/20 by degassing, i.e. liberation of dissolved gases degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D
• CPC Class Codes: C02F 1/66 by neutralisation; pH adjustment for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58
• CPC Class Codes: C02F 2101/322 Volatile compounds, e.g. benzene
• CPC Class Codes: F01K 3/188 using heat from a specified chemical reaction

Abstract

Disclosed are systems and methods useful in waste processing. Disclosed is the use of a regenerative thermal oxidation (RTO) unit for production of industrially useable steam. Disclosed are systems including a stripping unit associated with a regenerative thermal oxidation (RTO) unit so that the stripping unit provides fuel for the RTO unit and the RTO unit provides a stripping gas for the stripping unit. Disclosed are systems including an RTO unit providing steam to operate a vapor condensation (VC) unit.

Claims

1. A system for processing industrial waste water contaminated by volatile compounds and non-volatile salts and metal ions, comprising:

a) a regenerative thermal oxidation (RTO) unit, comprising a waste water inlet, a process air inlet, an RTO steam exhaust, an oxidizer, and heat exchangers disposed on the inlet and outlet sides of said oxidizer, adapted for pre-heating process air that enters said oxidizer with heat generated in said oxidizer;

wherein each of said disposed heat exchangers reversibly operates as a hot heat exchanger for transferring heat to said process air entering said oxidizer and as a cool heat exchanger for being heated by hot exhaust exiting said oxidizer; and

b) a vapor compression (VC) unit, coupled to said RTO unit steam exhaust, and comprising a steam inlet, a brine inlet, and a flash chamber;

wherein said RTO steam exhaust is directly connected to and in fluid communication with said VC unit steam inlet, such that when operating, said RTO exhaust directs steam from said RTO unit into said VC unit steam inlet to provide energy for operating said VC unit to separate solids from incoming brine.

2. The system of claim 1, wherein said flash chamber comprises a vacuum-producing component for operation of said flash chamber at reduced pressure.

3. The system of claim 1, wherein said flash chamber is configured for operation at atmospheric pressure.

4. The system of claim 1, wherein one of said disposed heat exchangers operates as said hot heat exchanger during other of said disposed heat exchangers operating as said cool heat exchanger.

5. The system of claim 1, wherein said disposed heat exchangers are configured for reversing operation as said hot and cool heat exchangers according to hotness or heating of said cool heat exchanger.

6. The system of claim 1, further comprising a reversible fan configured to drive said process air through said RTO unit towards said oxidizer.

7. The system of claim 1, wherein said oxidizer is selected from the group consisting of a thermal oxidizer, a flare oxidizer, and a thermocatalytic oxidizer.

8. The system of claim 1, wherein said VC unit further comprises a compressor for compressing steam received from said flash chamber.

9. The system of claim 8, wherein said compressor is a thermal vapor recompression (TVR) subunit, operating on steam.

10. The system of claim 8, further comprising a steam bus controlled by a steam distributor, configured to dynamically allocate steam from an external source of steam, from said RTO unit, and from said compressor, to said VC unit.

11. The system of claim 1, wherein said flash chamber comprises a fresh brine inlet, a hot brine inlet, and a brine outlet.

12. The system of claim 11, wherein said VC unit further comprises a heat exchanger operatively connected to said steam inlet, said brine outlet, and said hot brine inlet, and configured for heating brine charged to said flash chamber.

13. The system of claim 1, further wherein the RTO waste water inlet is provided by an output of a stripping unit comprising a stripping column, a waste water inlet, a stripping gas inlet and a stripping unit exhaust, wherein said RTO steam exhaust is directly connected to and in fluid communication with said stripping gas inlet, such that when operating, said RTO steam exhaust directs hot exhaust from said RTO unit into said stripping gas inlet as a stripping gas of said stripping unit.

14. The system of claim 13, wherein said stripping unit is a steam stripping unit.

15. The system of claim 13, wherein said stripping unit is a batch stripping unit comprising a sump.

16. The system of claim 15, further comprising a reagent addition port functionally associated with said sump.

17. The system of claim 13, wherein said stripping unit is a continuous flow stripping unit.