Coind has designed a chemical-physical system that can clean the bilge waters of the ships by producing an exhaust compliant with current regulations for discharge at sea.
Bilge waters consist of a mixture of hydrocarbons with brackish water in various proportions whose quantity and quality may vary from a minimum of 10% to 50% of the liquids withdrawn.
The treatment of wastewater is to separate the oil from the water directly into the storage tanks.
This way the oil can be sold to a well-equipped center that will turn it into a recovery fuel, and the water can be purified in the chemical-physical plant realized by Coind.
It is important that residual oil in water is less than 1%. This result can be achieved by static decantation within the collection tank for at least 7/10 days or by other mechanical systems offered by COIND.
Decanted water with reduced oil content of less than 1% but still rich in sulphides, aldehydes, glycols, can be filtered on paper and then sent to a chemical oxidation reactor or to an electrochemical system.
The flow then enters into a contact reactor where the powdery coal will be dosed indispensable to adsorb aldehydes and glycols.
In the next reactor will be dosed an inorganic flocculant that will coagulate the saturated carbon dust of pollutants and colloidal sulfur residue from the sulphides. In the last reactor, an organic flocculant will be dosed that will facilitate clarification, then produced in the lamellar decantation unit.
The purified water before being discharged directly into the sea will still be filtered on 50 μm paper to remove residual carbon dust after decanting.