The water of a river adapts to the possible path, without forgetting its mission: the ocean.
And this is the journey that oily substances have when they are poured into water, materials that not only pollute our rivers but also want to reach, without stopping, the sea.
However, we do not consider only the great environmental disasters, those where oil turns the ocean black (the latest in Mauritius – Why the Mauritius oil spill is so serious) but also the spill of oil and fuel in our territories and in our waterways.
According to the data available thanks to the International Tanker Owners Pollution Federation (ITOPF, 2019), in fact, one thousand tons of oil end up in the sea every year, and even if the number is steadily decreasing compared to the previous decade, the quantity is still alarming.
What do we know about oil contamination?
For sure human, urban, industrial and productive development is the main cause of an increased amount of substances that reaches our streams. A spill of such materials can trigger a number of different but equally dangerous scenarios.
Environmental, ecological but also economic and social consequences could have a serious impact on the ecosystem by affecting the natural balance of flora and fauna but also threaten the health of citizens.
All pollutants, which enter the water body through anthropogenic origin channels (mainly), have become a great concern precisely because of the various dangers they represent for the environment. However, not all types of oil are equally composed and it is necessary to distinguish them by evaluating their different viscosity, volatility and toxicity.
These are the generally recognized classifications internationally:
- light non-persistent oils (such as petrol): these are highly volatile oils (evaporation within 1-2 days without leaving residues). Highly flammable and toxic (high danger during cleaning operations).
- persistent light oils (such as diesel or light crude oils): moderately volatile oils (leave residues up to a third of the amount of spill, evaporation after a few days). Moderate flammability and toxicity.
- medium oils (such as petroleum, IFO 180): fairly volatile oils (evaporation of at least one third within 24 hours). Severe impact on waterfowl and mammals.
- Heavy oils (heavy crude oils, fuel oils): little or no evaporation or dissolution, heavy contamination of intertidal areas and severe impact of waterfowl and fur mammals (coating and ingestion). Possible long-term contamination of sediments.
- Sinking Oils: these are oils that sink into the water but with a similar behavior to the substances of the previous group (if in contact with the coast). Severe impacts on animals living in bottom sediments, such as many species of molluscs. Possible long-term contamination of sediments.
Why is an oil spill dangerous for the environment?
The conditions in which the contamination episode occurs are certainly to be taken into consideration. The nature of the oil, the quantities spilled and the impact on the ecosystem, on the flora and on the local fauna mean that each incident is assessed individually, in order to implement a targeted and effective recovery strategy.
In any case, the consequences on the territory are different and we can summarize them by citing the main ones: contamination of sediments, poisoning of both plant and animal species, decrease in the mobility of fauna and evident changes to the ecological balance (such as the loss of species that have proved to be more vulnerable).
However, even the recovery measures can have consequences that we can define indirect: to restore the environment, actions that can affect the habitat (cleaning, human presence, presence of vehicles) can be carried out.
The most modern initiatives can offer a concrete answer: River Cleaning Oil, the new plug-in of River Cleaning seeks to combat oil pollution thanks to an absorption system that allows the recovery of substances that float on the surface. This technology, which in this article it is described only in its simplest form ((there are in fact more sophisticated versions, we will tell you more in the coming weeks), therefore allows the surface of rivers to be “cleaned” of all pollutants in liquid form, as well as recovering floating plastic, and it does so without affecting the navigability of boats.
Visit the dedicated page: River Cleaning Oil
(2017) Shahryar J., Petroleum Waste Treatment and Pollution Control, Butterworth-Heinemann, pp. 117-148, ISBN 9780128092439, https://doi.org/10.1016/B978-0-12-809243-9.00004-3.
(2018) Invinbor Adejumoke, A. et al., Water Pollution: Effects, Prevention and Climate Impact, Intechopen
(2019) Environmental Effects of Oil Spills, visitabile all’indirizzo: https://www.itopf.org/knowledge-resources/documents-guides/environmental-effects/