To test, develop, and optimize a complete exhaust gas cleaning system, a test facility consisting of a 2 MW 4-stroke engine + SCR reactor for NOx reduction + exhaust gas boiler for waste heat recover + exhaust gas scrubber has been erected. This report describes the result of testing and optimizing the complete train of components: SCR, Waste Heat Recovery and scrubber. It also describes the noise attenuation in these units. Rapporten er skrevet på dansk med et engelsk abstract.