Control of odor and septicity of sewage

• US 5,141,647 A
• Filed: 12/27/1991
• Issued: 08/25/1992
• Est. Priority Date: 12/27/1991
• Status: Expired due to Fees

• Current Assignee: Amal K. Bhadra
• Original Assignee: Amal K. Bhadra
• Inventors: Bhadra, Amal K.
• Primary Examiner(s): WYSE, THOMAS G
• Application Number:
  US07/813,840
• Time in Patent Office: 242 Days
• Field of Search: 210/620, 210/631, 210/721, 210/758, 210/763, 210/916
• US Class Current: 210/620
• CPC Class Codes: C02F 1/72 by oxidation C02F1/4672 takes precedence
• CPC Class Codes: C02F 1/725 by catalytic oxidation
• CPC Class Codes: Y10S 210/916 Odor, e.g. including control or abatement

Abstract

This invention is a process for controlling odor and septicity of sewage. A sulfur dioxide species is added to the sewage among with metal ion catalyst and the sewage is aerated. The effect of this treatment is to reduce the generation of hydrogen sulfide and the odor and corrosion associated with this compound and to reduce the need for aeration in the treatment of sewage. This results in substantial savings in aeration costs.

Claims

1. The process of treating sewage for control of odor and septicity comprising the steps:

adding source of sulfur dioxide selected from the group consisting of sulfur dioxide, sulfite, bisulfite, metasulfite, pyrosulfite, and sulfurous acid dissolved in an alkaline aqueous solution,

adding a metal salt catalyst, and

aerating the sewage.

2. The process of claim 1 wherein the alkaline aqueous solution is a solution of sodium hydroxide.

3. The process of claim 1 wherein the alkaline aqueous solution is a solution of about 0.1N sodium hydroxide.

4. The process of claim 1 wherein the source of sulfur dioxide solution provides sulfur dioxide at a concentration of 1 to 300 PPM.

5. The process of claim 1 wherein the source of sulfur dioxide is sulfurous acid dissolved in aqueous sodium hydroxide solution.

6. The process of claim 1 wherein the metal salt catalyst is selected from the group consisting of salts of iron, copper, cobalt, nickel, chromium, manganese, titanium, and vanadium.

7. The process of claim 1 wherein the metal salt catalyst is at a concentration of 0.01 to 25 PPM metal.

8. The process of claim 1 wherein the metal salt catalyst is ferric chloride at a concentration of 0.01 to 25 PPM iron.

9. The process of claim 1 wherein the metal salt catalyst is ferric chloride at a concentration of 1 to 8 PPM iron.

10. The process of claim 1 wherein the metal salt catalyst is ferric sulfate at a concentration of 0.01 to 25 PPM iron.

11. The process of claim 1 wherein the metal salt catalyst is ferric sulfate at a concentration of 1 to 8 PPM iron.