title: Lactic acid fermentation within a cascading approach for biowaste treatment.
abstract: Limited availability of resources and increased amounts of waste coupled with an ever-increasing demand for raw materials are typical characteristics of our times. As such, there is an urgent need to accordingly update waste treatment technology. The aim of this study was to determine whether a separate treatment of the liquid and the solid fraction of biowaste could enhance overall efficiency. Liquid fractions obtained from two different separation procedures were fermented at a pH of 5 and uncontrolled pH conditions for 72 h. The fermentation conditions leading to highest lactic acid productivity and yield were evaluated. The substrates gained by both separation procedures showed efficient lactic acid production up to <25 g L(-1). The pH control increased lactic acid concentration by about 27 %. Furthermore, quantitative real-time PCR analyses revealed stronger Lactobacilli growth in these fermentations. As identified via Illumina sequencing Lactobacillus delbrueckii and its closest relatives seemed to drive the fermentation independent of the substrate. These results could help to improve today's resourcing concept by providing a separate treatment of the liquid and solid biowaste fraction.
authors: Institute of Microbiology, University of Innsbruck, Technikerstraße 25d, 6020, Innsbruck, Austria, Maraike.Probst@uibk.ac.at.
authors: Maraike
authors: M
authors: Probst
authors: Janette
authors: J
authors: Walde
authors: Thomas
authors: T
authors: Pümpel
authors: Andreas Otto
authors: AO
authors: Wagner
authors: Irene
authors: I
authors: Schneider
authors: Heribert
authors: H
authors: Insam
mesh_terms: D000693:Anaerobiosis; D001317:Austria; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D019344:Lactic Acid / Q000378:metabolism*; D048668:Lactobacillus delbrueckii / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D059013:Microbial Consortia; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S; D060888:Real-Time Polymerase Chain Reaction; D012037:Refuse Disposal / Q000379:methods*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014866:Waste Products
chemical_list: D012336:RNA, Ribosomal, 16S; D014866:Waste Products; D019344:Lactic Acid