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| Impact of steam explosion on municipal sewage sludge pretreatment and anaerobic VFAs fermentation |
| HAN Peng1, LIU He1,2, DING Chun-hua2, LIU Hong-bo1, FU Bo1 |
1. Jiangsu Key Laboratory of Anaerobic Biotechnology, Department of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122 China;
2. Zhenjiang East Biotech Equipment and Technology Co., Ltd., Zhenjiang, 212000 China |
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Abstract Municipal sludge was pretreated by steam explosion treatment to explore its impact on the characteristics of sludge and the subsequent acidogenic fermentation. Effects of pressure and dwell time on sludge solubility and physical microstructure were studied. The results showed that sludge structure was destroyed after the pretreatment. The concentration of SCOD, protein, polysaccharide and DNA in liquid phase could reach the highest level of 9544mg/L, 596.7mg/L, 1515mg/L and 9.1ng/ μL at 2 MPa, 4 min, respectively, which was increased by 37.7 folds, 19.4 folds, 12.5 folds and 3.64 folds of the raw sludge. In addition, changed sludge structure effectively reduced the size of sludge particles with the maximal reduction by 52.59% compared to average particle diameter of the raw sludge. After pretreatment, volatile fatty acids production through anaerobic fermentation could reach the highest concentration of 7.34g/L (1MPa, 3min), 7.12g/L (1.5MPa, 1min) and 8.15g/L (2MPa, 4min) at different pretreatment conditions, increasing by 1.55 times, 1.51 times and 1.72 times of the raw sludge, respectively. At the same time, longer dwell time could further improve solubility and potential of acid fermentation from sludge.
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Received: 16 May 2016
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