Patent EP-2301895-A1 (EP)
Inventor: BURMESTER HANS JOACHIM
IPC: C02F101/32
Filed: 2009-08-25
Abstract: The method for the treatment of bilge water from ship operation, comprises introducing the bilge water in a first cleaning process continuously through a first deoiling- and filtering plant (3) and subsequently for cleaning in a second cleaning process in a chemical treatment tank, where the bilge water is initially drained from the chemical treatment tank without further treatment and is conducted over a sensor element to determine a contamination concentration. The bilge water exiting the treatment tank is classified as non-contaminated. The method for the treatment of bilge water from ship operation, comprises introducing the bilge water in a first cleaning process continuously through a first deoiling- and filtering plant (3) and subsequently for cleaning in a second cleaning process in a chemical treatment tank, where the bilge water is initially drained from the chemical treatment tank without further treatment and is conducted over a sensor element to determine a contamination concentration. The bilge water exiting the treatment tank is classified as non-contaminated and is discharged if the contamination concentration determined by the sensor element does not exceed a predefinable threshold value. If the contamination concentration determined by the sensor element exceeds the predefinable threshold value, the bilge water flowing out of the chemical treatment tank is classified as contaminated and is recirculated in order to be fed into the chemical treatment tank once again, and the tank is then filled with a batch of bilge water that is subjected to a chemical treatment so as to precipitate contaminations, is drained after the treatment is completed, is conducted over the sensor element to determine the contamination concentration, and is discharged if the threshold value is met. The bilge water is led back during exceeding the given limit value for the contamination until it subsequently passes by the first deoiling- and filtering plant. The bilge water emerging from the chemical treatment is conducted over the sensor element through a filter element for filtering the precipitation and/or suspended matter. The flow of the chemical treatment tank is closed in the determined exceeding of the limit value for the contamination and the flow path of the bilge water is stopped through the first deoiling and filtering plant after reaching a filling condition of the chemical treatment tank. Chemical treatment agent is added for the chemical treatment of the bilge water determined as contaminants in the chemical treatment tank. An acidification agent is added for lowering the pH value on a value suitable for a precipitant in the first step and the precipitant is precipitated for binding and precipitating the contaminations such as hydrocarbons and/or heavy metals in the second precipitation step. A neutralization agent is added for increasing the pH value on a neutral value in the third neutralization step. The acidification agent consists of hydrochloric acid and iron(II)-sulfate or heptahydrate of the salt. The precipitant consists of sodium hydroxide and the neutralization agent is caustic soda. The pH value of the bilge water is 3-6 and a flocculants is added to the bilge water in addition to the precipitant for accelerating the precipitation process. The treated bilge water is selectively pumped over board of the ship or collected in an industrial water-collection container and is used as industrial water in the board of the ship.