title: Foam formation in biogas plants caused by anaerobic digestion of sugar beet.
abstract: The use of sugar beet in anaerobic digestion (AD) during biogas production can lead to process upsets such as excessive foaming in fermenters. In the present study, foam formation in sugar beet-fed digestates was studied in foaming tests. The increasing disintegration grade of sugar beet was observed to have a promoting effect on foaming in the digestate but did not affect the biogas yield. Chemical analysis of foam and digestate from sugar beet silage AD showed high concentrations of pectin, other carbohydrates and N-containing substances in the foam. Both pectin and sucrose showed little foaming in AD. Nevertheless, sucrose and calcium chloride had a promoting effect on foaming for pectin AD. Salts of divalent ions also enhanced the foam intensity in the case of sugar beet silage AD, whereas ammonium chloride and urea had a lessening effect on sugar beet-based foaming.
authors.affiliation: UFZ - Helmholtz Centre for Environmental Research, Centre for Environmental Biotechnology, Permoserstrasse 15, 04318 Leipzig, Germany. Electronic address: lucie.moeller@ufz.de.
authors.forename: Lucie
authors.initials: L
authors.lastname: Moeller
authors.affiliation: Leipzig University of Applied Sciences, Koburger Strasse 62, D-04416 Markkleeberg, Germany. Electronic address: marcus.lehnig@stud.htwk-leipzig.de.
authors.forename: Marcus
authors.initials: M
authors.lastname: Lehnig
authors.affiliation: Leipzig University of Applied Sciences, Koburger Strasse 62, D-04416 Markkleeberg, Germany. Electronic address: joachim.schenk@htwk-leipzig.de.
authors.forename: Joachim
authors.initials: J
authors.lastname: Schenk
authors.affiliation: UFZ - Helmholtz Centre for Environmental Research, Centre for Environmental Biotechnology, Permoserstrasse 15, 04318 Leipzig, Germany. Electronic address: andreas.zehnsdorf@ufz.de.
authors.forename: Andreas
authors.initials: A
authors.lastname: Zehnsdorf
mesh_terms: D000693:Anaerobiosis; D061249:Batch Cell Culture Techniques; D027461:Beta vulgaris / Q000737:chemistry*; D056804:Biofuels; D019149:Bioreactors / Q000382:microbiology; D001709:Biotechnology / Q000379:methods*; D017610:Calcium Compounds / Q000737:chemistry; D002412:Cations; D005285:Fermentation; D008697:Methane / Q000096:biosynthesis; D010087:Oxides / Q000737:chemistry; D010368:Pectins / Q000032:analysis; D012820:Silage; D013395:Sucrose / Q000032:analysis; D014508:Urea / Q000737:chemistry
chemical_list: D056804:Biofuels; D017610:Calcium Compounds; D002412:Cations; D010087:Oxides; D013395:Sucrose; D010368:Pectins; D014508:Urea; C016538:lime; D008697:Methane
keywords: Anaerobic digestion; Foam formation; Pectin; Sugar beet