Digestion of sand-laden manure slurry in an upflow anaerobic solids removal (UASR) digester |
| |
Authors: | Khursheed Karim Rebecca Hoffmann M H Al-Dahhan |
| |
Institution: | (1) Department of Energy Environmental and Chemical Engineering, Washington University, St. Louis, MO 63130, USA;(2) Ralph E. Martin Department of Chemical Engineering, University of Arkansas, 3202 Bell Engineering Center, Fayetteville, AR 72701, USA |
| |
Abstract: | Studies on the performance of a laboratory scale upflow anaerobic solids removal (UASR) digester were carried out using sand-laden
cow manure slurries having total solids (TS) concentration as 50 and 100 g/l. Hydraulic retention time (HRT) was maintained
as 32.4 days, which resulted in the volatile solids (VS) loading rates of 1 and 1.64 g/l d. The UASR system was designed to
remove sand from the manure slurry, while anaerobically digesting biodegradable solids inside a single reactor. To enhance
the contact of microorganisms and substrate, the liquor from the top of the digester was recirculated through the bed of settled
solids at its bottom. Volatile solids reduction through this process was observed to be 62% and 68% in the case of feed slurries
having TS concentration as 50 and 100 g/l (referred in the text as 5% and 10% feed slurries), respectively. The methane production
rates were observed to be 0.22 and 0.38 l/l d, while methane yield was 0.21 and 0.27 l CH4/g VS loaded, for 5% and 10% feed slurries, respectively. This indicates that the increase in the VS loading had a positive
impact on methane production rate and methane yield. It would be of interest to study the performance of a UASR digester at
higher solids loadings and with longer solids retention times. Nonetheless, the presented study showed that sand-laden manure
slurries can be successfully digested in a UASR digester producing methane energy equivalent to 4 kW h per m3 of digester volume per day. |
| |
Keywords: | Anaerobic Digestion Manure slurry Methane Mixing UASR |
本文献已被 PubMed SpringerLink 等数据库收录! |
|