title: On-line monitoring of a two-stage anaerobic digestion process using a BOD analyzer.
abstract: A computer-controlled biochemical oxygen demand (BOD) analyzer has been developed for fast estimation of biochemical oxygen demand (BODst) automatically with the purpose of on-line monitoring of a process for conversion of biomass under field conditions. The instrument was tested by on-line monitoring of the connecting stream between two stages of a two-stage anaerobic process in laboratory scale. In the first stage, hydrolysis of sugar beet leaves and its conversion into volatile fatty acids and other low molecular weight substrates took place. The effluent from the first reactor was used as a feed stream to the second stage, i.e. an anaerobic contact reactor. The feed stream was sampled intermittently, diluted and analyzed by the BOD analyzer automatically in order to estimate the organic loading rate to the reactor. The results from this study demonstrated that the BOD analyzer could be a stand-alone and promising sensor device for rapid on-line monitoring of easily biodegradable organic substances in biological treatment processes.
authors.affiliation: Department of Biotechnology, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-221 00 Lund, Sweden. jing.liu@biotek.lu.se
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.forename: Gustaf
authors.initials: G
authors.lastname: Olsson
authors.forename: Bo
authors.initials: B
authors.lastname: Mattiasson
mesh_terms: D000693:Anaerobiosis; D001322:Autoanalysis / Q000295:instrumentation / Q000379:methods; D001419:Bacteria / Q000254:growth & development; D019149:Bioreactors / Q000382:microbiology; D010100:Oxygen / Q000032:analysis* / Q000378:metabolism; D010101:Oxygen Consumption / Q000502:physiology; D012037:Refuse Disposal / Q000295:instrumentation / Q000379:methods*
chemical_list: D010100:Oxygen