(EPD®) for "GranFruttato" - Monini

Calculation of environmentalMonini EPD04 ® , December 2012performancep. 21EXTRACTIONOF THE OIL FROM THE OLIVES/2From malaxationto centrifugationCentrifugationThe olive paste resulting from the malaxationprocess is subjected to centrifugation in arotating conical drum, with a horizontal axiscommonly referred to as a decanter.Due to the different specific weights ofwater, oil, and olive pulp, the centrifugationseparates them over 2 to 3 phases. The3-phase decanter is the most consolidatedand utilized type found in Italy.In this case, three parts are separated bycentrifugation:• the olive pomace;• the oil must, containing a small amount ofwater;• the vegetation water, containing a smallamount of oil.This system requires the oil paste to bediluted in advance with mains water. The2-phase decanter is widespread throughoutSpain, Portugal and Greece, and differs fromthe 3-phase decanter due to the decreaseduse of water.The centrifugation process separates onlytwo parts:• the olive pomace and the vegetation water;• the oil must, containing a small amount ofwater.The oil must obtained from the extractionalways contains a residual amount of water,which is separated by the effect of thedifferent densities of the two liquids throughdecanting or centrifugation.Vertical centrifugation is the system used inall plants to separate the oil from the water.In this process, which is performed in verticalcentrifugal separators, both the oil mustand the vegetation water obtained from thehorizontal centrifugation are processed.