Performance range

BIOZONE® – Process


BIOZONE® Process – Combined chemical-oxidative and biological effluent treatment

The BIOZONE® process has been developed by WABAG for the treatment of effluent containing a high percentage of organic compounds, which are resistant to biodegradation. The process generally consists of a two-stage activated sludge plant with an intermediate oxidation step.

The areas of application include:

  • Pulp and paper industry
  • Pharmaceutical industry
  • Textile industry
  • Chemical industry
  • Foodstuffs industry
  • Landfill leachate

WABAG has successfully tested the process in various applications. In 2001 the first full-scale facility went into operation for the landfill leachate treatment plant at Würenlingen in Switzerland.

The process

In the first activated sludge stage, which is designed for high or medium sludge load, the biodegradable compounds are largely eliminated. The remaining organic substances are primarily “cracked” in the subsequent oxidation step. A comparatively small fraction is degraded completely. The chemical-oxidative “cracking” transforms a relatively large amount of the refractory constituents into biodegradable substances, which are removed in the second activated sludge stage. Depending on the wastewater to be treated, ozone or ozone/hydrogenperoxide are used as oxidants. In addition to the degradable organic oxidation products, the chemical reaction primarily produces water, oxygen and carbon dioxide.

Selected references:

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