Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 21, Pages 9904-9911Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.08.037
Keywords
Biogas; Municipal sludge; Hydrothermal treatment; UASB
Funding
- National High-Technology Research and Development Program of China (863 program) [2008AA062404, 2009AA064701]
- Ministry of Science and Technology of China [2010DFA22770]
- Beijing Municipal Natural Science Foundation [8102024]
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The supernatant of hydrothermally treated sludge was treated by an upflow anaerobic sludge blanket (UASB) reactor for a 550-days running test. The hydrothermal parameter was 170 degrees C for 60 min. An mesophilic 8.6 L UASB reactor was seeded with floc sludge. The final organic loading rate (OLR) could reach 18 kg COD/m(3) d. At the initial stage running for 189 days, the feed supernatant was diluted, and the OLR reached 11 kg COD/m(3) d. After 218 days, the reactor achieved a high OLR, and the supernatant was pumped into the reactor without dilution. The influent COD fluctuated from 20,000 to 30,000 mg/L and the COD removal rate remained at approximately 70%. After 150 days, granular sludge was observed. The energy balance calculation show that heating 1.0 kg sludge needs 0.34 MJ of energy, whereas biogas energy from the supernatant of the heated sludge is 0.43 MJ. (C) 2011 Elsevier Ltd. All rights reserved.
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