CMN · Compagnie Méridionale de Navigation, France

CMN uses XBEE Technology on the Girolata ferry to reduce greenhouse gas emissions

The Compagnie Méridionale de Navigation (CMN) desired to measure the efficiency of the XBEE Enzyme Fuel Technology to reduce greenhouse gas emissions.

CMN selected the Girolata ferry to be the test ship, then powered on HFO 380 which sulfur content was rated at 2.165%.

Overview of work performed on the ferry Girolata:

  • Girolata ferry connects Marseille, France, to the French island of Corsica.
  • The experiment was processed from July 2006 to September 2006 and continued to April 2007.
  • Ferry (IMO n°9088859) is 177.3 meters long, built-in 2002, with a capacity of 650 passengers, 160 cars, and 1,927 trucks.


  • Four engines with a total power of 43,000 Hp
  • Intermediate Fuel Oil 380


This campaign was mostly designed to measure the impact of the XBEE Enzyme Fuel Technology on Sulfur Dioxide emissions.

Method used

The Ascal laboratory (now Eurofins), accredited by COFRAC and agreed by the French Ministry of Ecology and Sustainable Development, was selected to perform the emission measurements.

Measurement schedule:

  • First measurement was on July 26, 2006, before using the XBEE enzymes. Then, during each bunkering operation, the fuel technology was added at a  rate of 4,000:1 (1 liter of XBEE for 4,000 liters of fuel).
  • Second measurement was on September 6, 2006, after one month of using XBEE in the fuel.
  • Third measurement was on April 19, 2007, after eight months of using XBEE fuel.

The following gases have been monitored and measured at every test: CO2, CO, NOx, NO, SO2. Oxygen (O2) has been measure in July 2006 and April 2007 (RESULTS PAGES 2 & 3).

Measurements were made on the chimney of the fourth main engine, at a rate of three thirty-minute sequences, spread over a two-hour period during which the engine was maintained at a constant load of 90% of the engine power.

The IFO 380 was treated at a ratio of one liter of XBEE to 4,000 liters of heavy fuel oil. The crew installed a dedicated tank to store XBEE on board, linked to a dosing pump that is connected to the bunkering pipeline.

Girolata ferry reduce greenhouse gas emissions with xbee
XBEE dosing pump
Girolata ferry reduce greenhouse gas emissions with xbee
XBEE storage tank

Measurement results show a significant reduction in greenhouse gas emissions when using XBEE:

Measured parameters
IFO 380 26/07/06
XBEE 380 06/09/06
Difference 2nd vs 1st (%)
Oxygen · O2 % on dry gas
Not measured
Carbon Dioxide · CO2 % on dry gas
Carbon Monoxide · CO (mg/Nm3) on dry gas
Sulfur · SO2 (mg/Nm3) on dry gas
Nitrogen Oxide · NO ppmw on dry gas
Nitrogen Dioxide · NOx ppmw on dry gas
Fume temperature °C


Compagnie Méridionale de Navigation

Marseille, France

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XBEE is an enzyme technology compatible with all fuels, in all engines. This cleaning treatment disperses water and fuel-derived organic contaminants.

Consequently, XBEE helps to clean up the whole fuel system and eliminate carbon deposits in the engines, hence a reduction of the maintenance costs and gas emissions _ in particular CO2, NOx and particulates.

Finally XBEE reduces the fuel consumption.