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Catalytic Wet Air Oxidation for Textile Effluents

Technology Overview

Environmental pollution is one of the major challenges that the world face today. Our water resources are threatened by contamination from industrial wastewater namely volatile organic pollutants generated from the petrochemical, textile, pharmaceutical, chemical, and automotive industries. A class of compounds that is of great concern are the organic dyes, which represent a large family of refractory organic pollutants. It is estimated that over 10,000 different dyes and pigments are used industrially and over 700,000 tons of synthetic dyes were produced in 2003 worldwide. With about 1-20% of the total world production of dyes being discharged to the aquatic environment during their application, this can potentially result in severe damages to the photosynthetic activities of aquatic plants and the health of humans.

Conventional methods for wastewater treatment include biological process, thermal decomposition, adsorption, membrane separation, and advanced oxidation process. Each of these methods has its strengths and limitations. The catalytic wet air oxidation (CWAO) process has gained much attention recently as its uses air as the oxidant at a relatively low cost.

This technology relates to a bimetallic hybrid catalytic system for oxidative degradation of organic pollutants. Compared to conventional wet air oxidation processes, CWAO utilizes less energy as it can operate under ambient conditions using a novel catalyst.

Technology Features & Specifications

  • Minimal use of chemicals
  • Achieve high catalytic activity at ambient conditions
  • Ease of facile synthesis of bimetallic hybrid catalyst in a one-pot process
  • Use of air as the sole oxidant in an aqueous solution
  • Stable nano-hybrid bimetallic catalyst, Au-Pd/NM (a hybrid of Na2Mo4O13 and MoO3), effective catalytic wet air oxidation of organic dyes, Safranine O and Methylene Blue can be achieved at ambient condition
  • Regenerable catalytic activity by either thermal regeneration or chemical wash

Potential Applications

  • Difficult to treat effluents containing recalcitrant and refractory COD from the leather, textile, cosmetic, paper and petrochemical industries

Customer Benefits

  • Low cost process that uses air as the sole oxidant at ambient conditions
  • Highly stable catalyst with ease of regeneration for repeated use
  • Retrofit solution that works with existing effluent treatment systems

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