期刊
BIORESOURCE TECHNOLOGY
卷 176, 期 -, 页码 218-224出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.10.125
关键词
Supercritical water; Sewage sludge; Mechanism; Combined process; Economic analysis
资金
- National Science and Technology Supporting Program of China [2011BAK06B04]
- Program for New Century Excellent Talents in University of Chinese Education Ministry [NCET-07-0678]
Influences of temperature and oxidation coefficient (n) on sewage sludge treatment in supercritical water and its corresponding reaction mechanism were studied. Moreover, the combined process of supercritical water gasification (SCWG) and supercritical water oxidation (SCWO) was also investigated. The results show that ammonia nitrogen, phenols and pyridines are main refractory intermediates. The weight of solid products at 873 K and n = 4 is only 3.5 wt.% of the initial weight, which is lower than that after combustion. Volatile organics in solid phase have almost released at 723 K and n = 0. Highest yield of combustible gases was obtained at n = 0, and H-2 yield can reach 11.81 mol/kg at 873 K. Furthermore, the combination of SCWG at 723 K and SCWO at 873 K with a total n = 1 is feasible for its good effluent quality and low operation costs. (C) 2014 Elsevier Ltd. All rights reserved.
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