Wastewater treatment by catalytic oxidation

• US 6,461,522 B1
• Filed: 02/17/2000
• Issued: 10/08/2002
• Est. Priority Date: 08/29/1995
• Status: Expired due to Fees

• Current Assignee: Korea Advanced Institute of Science and Technology
• Original Assignee: Korea Advanced Institute of Science and Technology
• Inventors: Chang, Won-Seok, Han, Seong-Hwan, Uhm, Sung-Jin, Pak, Dae-Won, Jung, Kwang-Deog, Cho, Seong-Hoon
• Primary Examiner(s): Simmons, David A.
• Assistant Examiner(s): LAWRENCE JR, FRANK M
• Application Number:
  US09/518,162
• Time in Patent Office: 964 Days
• Field of Search: 210/758, 210/759, 210/760, 210/762, 210/763, 210/908, 210/909
• US Class Current: 210/759
• CPC Class Codes: C02F 1/722 Oxidation by peroxides
• CPC Class Codes: C02F 1/725 by catalytic oxidation
• CPC Class Codes: C02F 1/74 with air aeration of stretches of water C02F7/00
• CPC Class Codes: C02F 1/78 with ozone C02F1/4672 takes precedence
• CPC Class Codes: Y10S 210/908 Organic

Abstract

Wastewater streams containing various pollutants are economically and efficiently treated at ambient temperature and pressure with hydrogen peroxide, oxygen or ozone in the presence of a heterogeneous catalyst comprising an element selected from the group consisting of Ni, Ru, Co, Fe, Cu, Mn, Li and a mixture thereof supported on a metal oxide selected from the group consisting of MgO, CaO, SnO₂, PbO and a mixture thereof.

Claims

1. A process for treating a wastewater stream to remove an oxidizable pollutant therefrom, which comprises bringing the wastewater stream into contact with hydrogen peroxide, oxygen or ozone in the presence of a catalyst at a temperature of 100 °

C. or below and under a pressure of 5 atm or below, the catalyst comprising a support material selected from the group consisting of MgO, CaO, SnO₂, PbO and a mixture thereof, and Fe as a metallic element.

2. The process of claim 1 wherein the process is conducted at an ambient temperature and pressure.

3. The process of claim 1 wherein the oxidizable pollutant is a compound selected from the group consisting of phenolic compounds, halogenated aliphatic compounds, halogenated aromatic compounds, nitrated aromatic compounds, aromatic heterocyclic compounds, nitrites, amides, mercaptans, ketones, ureas, imides, organic phosphor compounds, cyanides and a mixture thereof.

4. The process of claim 1 wherein the support material is MgO.