Abstract:
:This research investigates the effect of solids retention time (SRT) on the acid-phase anaerobic digestion of primary sludge. A series of experiments were conducted using two continuous-flow 3-L units with the following configuration: a completely mixed reactor (CMR) with clarifier and solids recycle and an upflow anaerobic sludge blanket (UASB) reactor. Results show that C(2) to C(5) volatile fatty acids (VFA) were the predominant compounds formed. At a constant hydraulic retention time (HRT) of 12 h, variation in SRT from 10 to 20 days resulted in a slight increase in VFA production in both systems, but at a shorter SRT (5 days) a drastic drop in acid production was observed. In addition, the percent distribution of VFA was to some extent affected by the change in SRT. On the other hand, organic matter degradation [measured by the chemical oxygen demand (COD) specific solubilization rate or the percent volatile suspended solids (VSS) reduction] appeared to be independent of SRT, at least in the range investigated. The percent soluble COD in the form of VFA, however, increased steadily with increasing SRT, approaching the 90% level at 20 days. The remaining soluble COD in the effluent from these systems may be mainly attributed to metabolic intermediates and unused soluble substrate.
journal_name
Biotechnol Bioengjournal_title
Biotechnology and bioengineeringauthors
Elefsiniotis P,Oldham WKdoi
10.1002/bit.260440103subject
Has Abstractpub_date
1994-06-05 00:00:00pages
7-13issue
1eissn
0006-3592issn
1097-0290journal_volume
44pub_type
杂志文章abstract::Hydrocarbon oils of the alga Botryococcus braunii, extracted from a natural "bloom" of the plant, have been hydrocracked to produce a distillate comprising 67% gasoline fraction, 15% aviation turbine fuel fraction, 15% diesel fuel fraction, and 3% residual oil. The distillate was examined by a number of standard petro...
journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
doi:10.1002/bit.260240116
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journal_title:Biotechnology and bioengineering
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journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
doi:10.1002/bit.260381016
更新日期:1991-12-05 00:00:00
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pub_type: 杂志文章
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更新日期:1999-12-05 00:00:00
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journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
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更新日期:2014-08-01 00:00:00
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journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
doi:10.1002/bit.260320204
更新日期:1988-07-05 00:00:00
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journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
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更新日期:1988-08-20 00:00:00
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journal_title:Biotechnology and bioengineering
pub_type: 杂志文章,评审
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更新日期:2020-04-01 00:00:00
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journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
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更新日期:2015-12-01 00:00:00
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更新日期:2020-01-01 00:00:00
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journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
doi:10.1002/bit.260310714
更新日期:1988-05-01 00:00:00
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journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
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更新日期:2011-01-01 00:00:00
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pub_type: 杂志文章
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更新日期:2007-08-01 00:00:00
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journal_title:Biotechnology and bioengineering
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journal_title:Biotechnology and bioengineering
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更新日期:2000-06-05 00:00:00
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journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
doi:10.1002/bit.260410802
更新日期:1993-04-05 00:00:00
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journal_title:Biotechnology and bioengineering
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更新日期:2007-06-01 00:00:00
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journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
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更新日期:1987-07-01 00:00:00
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journal_title:Biotechnology and bioengineering
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更新日期:1988-02-20 00:00:00
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journal_title:Biotechnology and bioengineering
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更新日期:2016-10-01 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2020-10-01 00:00:00