Wet oxidation – Dual TOP technology

Wet oxidation (WO) is an extremely versatile hydrothermal process that can be used to treat wastewater with high COD content and/or containing refractory compounds hard to degrade, and to reduce sludge mass and the presence of other substances or microorganisms potentially dangerous to people’s health and to the environment.
Our unique patented Dual TOP technology can simultaneously treat wastewater and biological sludge.

WO consists in the oxidation of dissolved and suspended pollutants, including refractory ones, at elevated temperature and pressure using oxygen or air as the oxidizing agent.
The elevated operating pressure maintains water in the liquid phase and improves the oxidation rate by increasing dissolved oxygen concentration. Pollutants are effectively converted to carbon dioxide, water, and intermediate oxidation products (smaller molecules).

The volatile (organic) suspended solids are almost completely removed with a sludge mass reduction of up to 80%-90%. The remaining solid, mainly inorganic, can be easily settled and dewatered: a strong reduction of sludge disposal costs is so pursued.
The liquid stream is detoxified, odour and colour are almost completely removed and its COD content is strongly decreased. The remaining COD is mostly represented by highly biodegradable, low molecular weight compounds that can be treated in standard WWTP.

Moreover, organic nitrogen is converted into ammonia that can be recovered as a nutrient.
Catalytic wet oxidation may also be employed to achieve greater destruction operating at lower temperatures and pressure or reduced oxidation time. The aqueous stream is mixed with a catalyst before undergoing the oxidation process.


Overview

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Features and rangeability

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Key benefits

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Applications

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References

Industrial biological sludge
Italy - 2009
Industrial biological sludge

WO plant (Dual TOP technology)
3 t/h

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