Bioremédiation: compostage
Bioremédiation: compostage
Type de traitement: Traitement
Description:windrow composting, usually considered the most cost-effective composting alternative
Déchets:
Lightly oiled seaweed and vegetation (i.e. biodegradable material), sand may be present
Situation/Possibilités dans le pays:
May be very easily implemented.
Intérêt:
- Recovery of natural resource (sand)
- Low cost
- Larger quantity will result in economy of scale
Critères d'entrée:
Oil with a high asphaltene and resin content degrades slowly due to the molecular recalcitrance of the hydrocarbons while oil with a high aliphatic and aromatic content is a much more nutrient-dependent process and will degrade more rapidly within the adequate environment. It is recommended to carry out a GC/ MS analysis to define the composition of the oil and evaluate its biodegradability.
Usable only for oiled vegetal that are lightly to medium polluted, and should not contain cobble or boulder.
Contraintes opérationnelles:
Impacts:
Minimal if suitable monitoring and containment program is implemented.
But possible increase of VOC (Volatile Organic Compound) emissions, and windrow composting has a high dust emission.
Contraintes légales:
Refer to waste and oily water / soil legislation.
Efficacité:
Composting is faster than enhanced bioremediation on site: process lasts less than one year (may be 3 to 6 months depending on the degree of pollution of the waste).
Bioremediation degrades aromatics, N-alkanes and iso-alkanes. Resins and Asphaltenes are usually resistant to bioremediation. Cyclic hydrocarbon (Saturated and Aromatics) are partially biodegraded.
Coût:
Costs compare to the cost of land farming (usually less than 50 Euros per ton). However, composting does not require large areas of land and compost can be sold at 15 to 23 Euros per ton (Source: Damien).