K. Hanaki et al., CHARACTERIZATION OF ACCUMULATED BIOMASS IN ANAEROBIC FILTER TREATING VARIOUS TYPES OF SUBSTRATES, Bioresource technology, 47(3), 1994, pp. 275-282
Citations number
6
Categorie Soggetti
Energy & Fuels","Biothechnology & Applied Migrobiology",Agriculture
Laboratory-scale anaerobic upflow filters were operated at hydraulic r
etention times of 3-9 days to examine the accumulation and activity of
biomass in the degradation of about 2000-2500 mg COD/liter of glucose
, egg albumin or acetate. Four or six filters were operated under inde
ntical conditions in parallel, and disassembled at certain intervals t
o determine amount and activity of biomass after effluent quality and
methane production reached steady state. The amount of biomass per vol
ume of filter still increased with time in the range of 1500-8000 mg v
olatile solids (VS)/liter with solid retention time longer than 100 da
ys. Biomass was grouped into biofilm in the bottom (BTM), biofilm in t
he top (TOP), and non-attached biomass (FREE). BTM showed the largest
amount while TOP showed the highest specific methanogenic activity. Gr
owth yields estimated by taking into account biomass increase within t
he filter were 0.13-0.15, 0.10 and 0.039 (VS/COD) for the filter fed w
ith glucose, egg albumin and acetate, respectively.