Basic studies on adhesion of anaerobic micro-organisms to inert carriers
The main purpose of this project was to study the microbial adhesion on an inert carrier, specifically in bench-scale and pre-pilot fluidised-bed anaerobic reactors. Lake sand (250 micron, porosity 38%), the best performing carrier, was used to investigate the biofilm development kinetics, and the biomass and reactor yields under increasing organic loading conditions, with a synthetic medium as feed. Biolayer thickness, its distribution along the fluidised bed, biomass weight/cm2 carrier surface and biomass dry density were evaluated using statistical analysis. Colonisation occurred firstly at the top level of the fluidised bed; the anaerobic bioaccumulation kinetics features were comparable to those reported for the aerobic ones. The best results for biofilm accumulation and the best whole reactor performances were obtained with a 100% fluidised sand bed, the former after an accumulation time of 4.5 months. The thickest film occurred at the top of this bed. Pre pilot scale experiments showed that real industrial waste is superior to synthetic waste both in terms of the induction of biofilm and in the specific reactor performance.
Bibliographic Reference: EUR 12439 EN (1989) MF, 75 pp., ECU 4, blow-up copy ECU 10
Record Number: 198911186 / Last updated on: 1994-12-01
Original language: en
Available languages: en