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Wastewater treatment catalysts for Catalytic Wet Air Oxidation (CWAO)

Product Wastewater treatment catalysts for Catalytic Wet Air Oxidation (CWAO)

Nippon Shokubai's catalytic wet air oxidation for wastewater treatment method can replace incineration treatment. High-efficiency and low-cost process canbe achieved with maintenance-free equipments.
Using solid catalysts originally developed by Nippon Shokubai, Toxic COD components, organic nitrogen compounds, ammonia, sulfur compounds and organic chlorides are detoxified into carbon dioxide, water, nitrogen, sulfate, hydrochloride, and others by the catalytic oxidation under liquid phase conditions.
More advanced treatment is possible by combining with biological treatment.

1.Features

  1. Simultaneous removal of COD and nitrogen-/sulfur- containing compounds.
  2. Low running cost.
  3. Space saving, due to the compact plant design.
  4. Stable continuous and automatic operation.
  5. Even CODCr of 20,000mg/L in wastewater can be treated without supplying any auxiliary fuel.
  6. Recovered energy as steam from the oxidation reaction of the wastewater.
  7. Denitrification, deodorization and decolorization are possible.
  8. Clean exhaust gases without SOx, NOx, and Dioxins.
  9. No secondary pollutants, like sludge and ashes.
  10. Treated water can be reused (in the case of high treatment efficiency).

2. Applicable wastewater

  1. COD components ( Supports components that are difficult for biological treatment (※))
       formalin※, acetaldehyde※, glyoxal,
       phenol※, dioxane※, methyl methacrylate (MMA),
       formic acid, acetic acid, acetone, tetrahydrofuran (THF), methyl ethyl ketone (MEK), methyl alcohol,
       terephthalic acid, ethylene glycol, pentaerythritol etc.
  2. Wastewater containing sulfur compounds such as sodium sulfide, sodium thiosulfate,
       dimethyl sulfoxide (DMSO) etc.
       ex. wastewater from ethylene plants and spinning plants etc.
  3. Wastewater containing nitrogen compounds such as ammonia, isocyanate, acrylonitrile etc.
  4. Wastewater containing organic chlorine compounds such as dioxins etc.

3. Catalyst

As the wastewater treatment catalysts for catalytic wet air oxidation, a solid catalyst originally developed by Nippon Shokubai is charged in the reactor.

4. System Flow

This system is composed of the process units of wastewater supply, compressed air supply, heat exchanging, catalytic reaction and liquid-gas separation.

System Flow

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