A kinetic study on methanogenesis by attached biomass in a fluidized bed

Modeling the Two-Stage Anaerobic Digestion of Domestic Wastewater With the Development of a Monitoring Application

“…In the case of synthetic wastewater, the estimated parameters k m,ac and k m,pro had to be set one order of magnitude smaller than the ones recommended in Batstone et al (2002). However, these values are similar to the ones reported by Kuba et al (1990) (k m,ac = 0.26 day -1 and k m,pro = 0.19 day -1 ) when treating the same synthetic mix.…”

A New Device to Select Microcarriers for Biomass Immobilization: Application to an Anaerobic Consortium

“…They observed a faster biomass accumulation on granular activated carbon (GAC) than on sand particles and the shear-loss coefficient observed for GAC was 4.9 to 16.2% smaller than for sand and anthracite. Kuba et al (1990) operated a fluidized-bed reactor with a synthetic zeolite as the support material and a mixture of acetate, propionate, and butyrate as the substrate. They found a higher amount of VS attached to the particles than the estimated active biomass concentration calculated from kinetic batch assays.…”

Anaerobic fluidized bed digestion of primary and thickened waste activated sludges

“…Anaerobic digestion of biosolids can be divided into four sequential steps: hydrolysis (digesting large polymers into small monomers), acidogenesis (converting monomers into volatile fatty acids), acetogenesis (degrading volatile fatty acid into acetic acid, CO 2 , and H 2 ), and methanogenesis (consuming acetate acid and producing CH 4 ) [1], carried out by various microbial groups that exist both in suspended phase and attached biofilm phase in biofilm reactors [4,13]. In anaerobic biofilm processes, as a result of decoupling the HRT from the SRT and due to the difference in attachment characteristics between biomass and inerts (i.e.…”

“…Bull et al [12] observed that methanogens mainly grew attached to the carrier surface while acidifiers tend to appear in the suspended phase when testing an anaerobic fluidized bed reactor with glucose solution at an HRT of 5 days and OLRs ranging from 6 to 18 kg COD m À3 d À1 . Kuba et al [13], using zeolite as support media in an anaerobic fluidized bed treating volatile fatty acids (VFAs) based synthetic wastewater at an OLR of 4 kg COD m À3 d À1 , claimed that not all of the attached biomass were active methanogens.…”

“…While anaerobic microbial activity in biofilm reactor has been assessed using SMA test [7,13,14], the activity of other anaerobic microbial groups have been scantily evaluated in the literature, presumably due to the common perception that methanogenesis is often the rate limiting anaerobic process. However, this postulation is not valid for solids digestion which is hydrolysis-limited [16].…”