Bioaugmenting anaerobic digestion of biosolids with selected strains of Bacillus, Pseudomonas, and Actinomycetes species for increased methanogenesis and odor control.
The objective of this study was to evaluate the effects of bioaugmenting anaerobic biosolids digestion with a commercial product containing selected strains of bacteria from genera Bacillus, Pseudomonas, and Actinomycetes, along with ancillary organic compounds containing various micronutrients. Spe...
| Main Authors: | , , , , , |
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| Format: | |
| Language: | English |
| Published: |
2006
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| Online Access: | http://ezproxy.villanova.edu/login?url=https://digital.library.villanova.edu/Item/vudl:175918 |
| Summary: | The objective of this study was to evaluate the
effects of bioaugmenting anaerobic biosolids digestion with
a commercial product containing selected strains of bacteria
from genera Bacillus, Pseudomonas, and Actinomycetes,
along with ancillary organic compounds containing various
micronutrients. Specifically, the effects of the bioaugment
in terms of volatile solids destruction and generation and
fate of odor-causing compounds during anaerobic digestion
and during storage of the digested biosolids were studied.
Two bench-scale anaerobic digesters receiving primary and
secondary clarifier biosolids from various full-scale biological
wastewater treatment plants were operated. One of the
digesters received the bioaugment developed by Organica
Biotech, while the other was operated as control. The
bioaugmented digester generated 29% more net CH4 during
the 8 weeks of operation. In addition, the average residual
propionic acid concentration in the bioaugmented digester
was 54% of that in the control. The monitoring of two
organic sulfide compounds, methyl mercaptan (CH3SH)
and dimethyl sulfide (CH3SCH3), clearly demonstrated the
beneficial effects of the bioaugmentation in terms of odor
control. The biosolids digested in the bioaugmented
digester generated a negligible amount of CH3SH during
10 days of post-digestion storage, while CH3SH concentration
in the control reached nearly 300 ppmv during the
same period. Similarly, peak CH3SCH3 generated by stored
biosolids from the bioaugmented digester was only 37% of
that from the control. |
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