Journal
BIORESOURCE TECHNOLOGY
Volume 123, Issue -, Pages 189-194Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.08.017
Keywords
Alkaline pretreatment; Anaerobic digestion; Sludge
Funding
- China Major Science and Technology Program for Water Pollution Control and Treatment [2011ZX07317]
- Natural Science Foundation of China [51008174]
- fund of Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China [SWMES201011]
- Shenzhen Science and Technology Research and Development Fund [JC201005270309A]
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NaOH was used to disintegrate a mixture composed mainly of primary sludge with biofilm sludge before anaerobic digestion in batch experiments. NaOH pretreatment dissolved some organic substances, and the optimum dose was 0.1 mol/L. After the alkali-treated sludge was fed into the digesters, the higher pH delayed the start of digestion and reduced the biogas production during the initial stage, although the system recovered after a lag phase when the dose was lower than 0.04 mol/L. Acid conditioning was necessary, but the increased salinity also impacted on the digestion efficiency. For sludge pretreatment, the optimum NaOH dose was 0.1 mol/L, and the initial pH of the batch digesters needs to be controlled at less than eight. Under optimized conditions, the organic degradation rate was 38.3% and the biogas yield was 0.65 L/g volatile suspended solid (VSS), whereas these values for the control were 30.3% and 0.64 L/g VSS, respectively. (C) 2012 Elsevier Ltd. All rights reserved.
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