Tunnel Composting

Aerobic Biological Treatment of Organic Waste in Bio-Cells for Compost Production


The technology is suitable for the treatment of:

  • Organic/ biodegradable fraction of municipal solid waste
  • Source-sorted organic waste
  • Waste garden
  • Agricultural waste, waste from business and other activities
  • Biological sludge from municipal wastewater


This is a controlled ventilation process of aerobic biological treatment, performed in enclosed spaces – reactors (garage type). The system is modular, which allows expansion and flexibility in the seasonal variation in quantity of waste. The aeration of the waste mass is controlled through a pipe network, which is embedded in the floor of the reactors. The processed air, which passes through the material, is sent to the biofilter in order to be deodorized and purified before being released to the atmosphere. Each reactor has a waste wetting system, a leachate collection system as well as an automatic adjustment and control system of the treatment. Through biological treatment is achieved reduction in the mass of waste by 36%. The waste temperature maintain above 60°C, for a continuous period, which leads to the purification of the waste and to the destruction of pathogenic microorganisms. The result is the production of a stabilized and odorless material which can be used as fertilizer.


  • Environmental management based on the National and European legislation
  • Reducing the mass of waste and residues landfilled
  • Simplicity in design and system operation
  • Strong construction, without complex mechanical parts and high maintenance requirements
  • Possibility to extend and expand capacity
  • Flexibility in the seasonal variation of waste
  • Production of a utilizable product


Waste stream Organic waste, Biological sludge
Amount of Waste 5.000 – 150.000 tn / year
Reducing waste mass 36%
Treatment time 21 days
Treatment product Compost


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