Methaanlekkage bij mestvergisters : kwalitatieve screening van 10 Jumpstart mono-mestvergisters

At the moment, it is assumed that 4.4% of the total gas production in a (mono)-manure fermentation installations is lost to the environment. This percentage is based on measurements at different types of fermenters, with different sizes and a in a wide range of ages. A screening to determine leakage points at 10 mono-fermentation Jumpstart installations commissioned by FrieslandCampina's showed that the number of leakage points was considerably lower than found in comparable studies. The largest leakage points were detected at the digestate storage and the process at the CHP/green gas room where the produced biogas was processed. Due to the lower amounts of leakage points found and the obligation to cover digestate storages in the Netherlands it is plausible that digesters installed within Jumpstart have a lower methane leakage percentage than the 4.4% used to date (under the condition that these installations are regularly tested for leakages and these leakages are fixed). To establish a new average leakage percentage it is advised use on-site measuring techniques and use these to validate remote sensing techniques.