Domestic wastes

Two types of treatment are to be considered, according to the waste composition: Composting and Methanisation.

Composting is the decomposition of biodegradable organic matter by oxidation, producing compost, a product that can be used as a fertilizer or soil conditioner, thanks to the work of aerobic microorganisms (organisms who require oxygen to live). The process is best applicable for vegetable waste containing a high concentration of ligneous (woody) structured components as wood, branches and straws. The latter enhances the diffusion of oxygen inside the mass, essential for the activity of the microorganisms.

Methanisation is the decomposition of biodegradable organic matter by digestion, producing compost (after a finishing stage). Besides that it produces also a renewable energy in the form of biogas. The digestion is an anaerobic process, which takes place in the absence of oxygen. The process is best applicable for humid to liquid waste and/or for waste easily fermenting while producing foul-smelling emissions as well as waste containing a high energy potential (sugars, starch, greases, cellulose paper).

Composting and methanisation allow the recycling of organic matter back to the soil. Only the digestion process can produce renewable energy. Recovery of by-products, energy and compost, is an essential aspect for a successful project.

Type of treatment, waste composition, type of collection and final recovery: the overall waste management chain must be consistent.

Our contribution:

Technical review: inventory of waste sources, inventory of technologies, collection methods, market review
Technical-economical feasibility studies
Comparative Eco Balance (Life Cycle Analysis) for several chains/processes (*): Greenhouse effect balance (CO2), resource consumption
Environmental impact reports
Site assistance during the construction phase (*)
Exploitation assistance: Operation audits, validation of the performance, product characterisation, advice
Technical-economical survey of projects

Combined ISO certification (9000 and 14000) for biological treatment plants (*)

(*) In collaboration with local partners or specialists if the case arises.