Polluted and odorous waste and exhaust gases can be removed most cost-effectively through biological treatment. High-performance biological waste-gas treatment plants are required to fulfil several tasks:

• Rapid adaptation of the microorganisms to the hazardous organic compounds (chlorinated hydrocarbons, amines, mercaptane, etc.),
• Neutralisation of the biologically formed acids HCl, HNO3 or H2SO4,
• Good () supply of the biomass with nutrients,
• At low energy consumption.

These requirements can be readily met with the support of modern

• TRICKLE-BED REACTORS, through
• ADAPTED, SPECIAL BIOMASS,
• IMMOBILISED with adsorbing, porous LEVAPOR carriers

Adsorbing, porous LEVAPOR-carriers measuring 25 x 25 x2 5 mm

• Weigh dry only approx. 30 bis 40 kg/m³,
• Absorb over 250 wt.% water (very important for bioactivity!),
• Suffer no loss of pressure,
• Rapidly bind special organisms and the substances to be degraded,
• Rapidly achieve maximum performance very quickly,
• Last for over 10 years.

Fig 1: Operation of a trickle-bed reactor

	Fig. 2. Bio-Trickle-Bed Reactor