Pietsch, Torsten Macro- and microscopic in-situ observation of gas bubbles and sludge particles in a biogas tower reactor. [electronic resource] - Water research Jun 2002 - 2836-42 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 0043-1354 Standard No.: 10.1016/s0043-1354(01)00511-5 doi Subjects--Topical Terms: BiomassBioreactorsFiltrationFlocculationGasesParticle SizeRefuse DisposalSewage--chemistryWater Movements