Odour Control on MBT Plants

TECNIUM develops the engineering and provides the necessary equipment for Air Treatment and Odor Control installations in MBT plants, producing composting or biogas.

Several international references of capacities up to 350,000 Tm/year and air flows up to 500,000 Nm³/h per installation backup our experience.

These plants, from air treatment point of view, can be divided into several parts according to composition and concentration of pollutants:

A- Pretreatment Zone (Reception, Classification and Feeders):

The air collected in these areas are considered of LOW LOAD (low NH₃ contain) and can be extracted from local intakes or room intakes.

Treatment consists of humidification stage followed by organic biofilter systems.

If the presence of pollutants in these air flows is very low, these aire can be used as refresh air for fermentation zone.

B- Fermentation Zone

The organic fraction coming out from pretreatment can be treated 2 ways:

B.1. Aerobically to produce “compost” with different technologies using tunnels, trenches, solar drying (sludge drying), bucket wheel.

In this case, the gaseous emissions are considered HIGH LOAD with important presence of NH₃ and the solution to treat them requires the use of acidic scrubbers, humidification and organic/inorganic biofilters.

B.2. Anaerobic digesters, if this case biogas is generated and used to produce electrical power. The residual sludge coming out from digesters is then stabilized and an odor control unit similar to previous one is required.

C- Maturation and Screening Zones

Finally, the compost is stabilized in the maturation area subsequently passing the refining area where the thick fraction is removed.

The air collection is usually done by room intakes and is considered of LOW LOAD, receiving a similar treatment as to pretreatment.