Abstract
A feasibility test of a 17 m3-pilot-scale sewage treatment system was carried out by continuous feeding of raw municipal sewage under ambient temperature conditions. The system consisted of a UASB and an aerated fixed bed reactor. Some of the effluent from the fixed bed reactor was returned to the UASB influent in order to provide a sulfate source. The total BOD of 148-162 mg l-1 in the influent was reduced to a more desirable 11-25 mg l-1 in the final effluent. The levels of methane-producing activity from acetate and H2/CO2 gas at 10 °C were only 2% and 0% of those at 35 °C, respectively. On the other hand, the sulfate-reducing activity levels of the UASB sludge were relatively high at 10 °C, for example, 18% for acetate and 9% for H2/CO2 gas, compared to the activity levels at 35 °C. Therefore, BOD oxidization by sulfate reduction in the UASB was greater than that by methane production under low temperature conditions. This sulfate-reducing activity tended to be proportional to the copy number of adenosine-5′-phosphosulfate (APS) reductase genes in DNA extracted from the sludge.
Original language | English |
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Pages (from-to) | 177-182 |
Number of pages | 6 |
Journal | Bioresource Technology |
Volume | 98 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2007 Jan |
Keywords
- Aerated fixed bed
- Domestic sewage
- Pilot-scale UASB
- Sulfate-reducing activity
- apsA gene
ASJC Scopus subject areas
- Bioengineering
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal