- Library Home /
- Search Collections /
- Open Collections /
- Browse Collections /
- UBC Theses and Dissertations /
- The design and testing of a short HRT attached growth...
Open Collections
UBC Theses and Dissertations
UBC Theses and Dissertations
The design and testing of a short HRT attached growth pre-fermenter system: SCVFA production by two media types and two feed sources Dumitrescu, Alex
Abstract
A pilot-scale, short Hydraulic Retention Time (HRT), fixed film fermenter system was constructed to test for Short Chain Volatile Fatty Acids (SCVFA) production performance at various retention times. The performance of two media types, Ringlace® and Kaldnes media, was monitored at intervals of 20min, 40min and 60min provided by three 20min hydraulic retention time (HRT) reactors in each media series. The UBC waste water pilot plant was used as the waste source for all experiments. Two fermentation runs were completed; the first using primary effluent as feed and the second using screened raw wastewater. The sampling and processing scheme addressed temporal variations in the following parameters: SCVFA concentration, total organic carbon (TOC), total chemical oxygen demand (tCOD), soluble chemical oxygen demand (sCOD) and suspended solids analysis. Turbidity analysis was attempted but was not continued for the duration of the research. Metabolic fingerprinting, using the BIOLOG plate assay, provided a snapshot of the biofilm's grouped microbial metabolic activities present at the time of sampling. SCVFA production in the BF-system was near zero in the reactors containing no media during both the primary effluent and raw wastewater runs. Significant levels of SCVFA's were produced by short HRT attached growth fermenters using both primary effluent and raw wastewater as feed. Both sets of media reactors tested produced more SCVFA's than the control reactors. TOC and sCOD analyses, which measure dissolved organics in the waste stream, indicated a net solubilization of filterable solids in both media series fed raw wastewater. Kaldnes media was deemed not suitable as a short HRT pre-fermentation media in the current BF-system configuration, due to an inability to handle the solids loading of the waste stream. Suspended solids analysis supported the choice of appropriate media for future research by demonstrating the tendency of Kaldnes media to become clogged with solids. Ringlace® media has proven itself as a suitable short HRT pre-fermentation media by resisting plugging under the solids loading conditions tested. Results of the two fermentation runs indicate that, a 60min HRT fermenter system fed raw domestic wastewater, is capable of producing significantly more SCVFA's than a system fed primary effluent, (11.2mg/l and 5.6mg/l, respectively).
Item Metadata
Title |
The design and testing of a short HRT attached growth pre-fermenter system: SCVFA production by two media types and two feed sources
|
Creator | |
Publisher |
University of British Columbia
|
Date Issued |
1998
|
Description |
A pilot-scale, short Hydraulic Retention Time (HRT), fixed film fermenter system was constructed
to test for Short Chain Volatile Fatty Acids (SCVFA) production performance at various retention
times. The performance of two media types, Ringlace® and Kaldnes media, was monitored at
intervals of 20min, 40min and 60min provided by three 20min hydraulic retention time (HRT)
reactors in each media series. The UBC waste water pilot plant was used as the waste source for all
experiments. Two fermentation runs were completed; the first using primary effluent as feed and
the second using screened raw wastewater.
The sampling and processing scheme addressed temporal variations in the following parameters:
SCVFA concentration, total organic carbon (TOC), total chemical oxygen demand (tCOD), soluble
chemical oxygen demand (sCOD) and suspended solids analysis. Turbidity analysis was attempted
but was not continued for the duration of the research. Metabolic fingerprinting, using the BIOLOG
plate assay, provided a snapshot of the biofilm's grouped microbial metabolic activities present at
the time of sampling.
SCVFA production in the BF-system was near zero in the reactors containing no media during both
the primary effluent and raw wastewater runs. Significant levels of SCVFA's were produced by short HRT attached growth fermenters using both primary effluent and raw wastewater as feed. Both
sets of media reactors tested produced more SCVFA's than the control reactors. TOC and sCOD
analyses, which measure dissolved organics in the waste stream, indicated a net solubilization of
filterable solids in both media series fed raw wastewater. Kaldnes media was deemed not suitable
as a short HRT pre-fermentation media in the current BF-system configuration, due to an inability
to handle the solids loading of the waste stream. Suspended solids analysis supported the choice of
appropriate media for future research by demonstrating the tendency of Kaldnes media to become
clogged with solids. Ringlace® media has proven itself as a suitable short HRT pre-fermentation
media by resisting plugging under the solids loading conditions tested. Results of the two
fermentation runs indicate that, a 60min HRT fermenter system fed raw domestic wastewater, is
capable of producing significantly more SCVFA's than a system fed primary effluent, (11.2mg/l and
5.6mg/l, respectively).
|
Extent |
11529019 bytes
|
Genre | |
Type | |
File Format |
application/pdf
|
Language |
eng
|
Date Available |
2009-05-04
|
Provider |
Vancouver : University of British Columbia Library
|
Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
|
DOI |
10.14288/1.0099238
|
URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
|
Graduation Date |
1998-05
|
Campus | |
Scholarly Level |
Graduate
|
Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.