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- Title
Pyrolysis of Dried Wastewater Biosolids Can Be Energy Positive.
- Authors
McNamara, Patrick J.; Koch, Jon D.; Liu, Zhongzhe; Zitomer, Daniel H.
- Abstract
Pyrolysis is a thermal process that converts biosolids into biochar (a soil amendment), py-oil and py-gas, which can be energy sources. The objectives of this research were to determine the product yield of dried biosolids during pyrolysis and the energy requirements of pyrolysis. Bench-scale experiments revealed that temperature increases up to 500 °C substantially decreased the fraction of biochar and increased the fraction of py-oil. Py-gas yield increased above 500 °C. The energy required for pyrolysis was approximately 5-fold less than the energy required to dry biosolids (depending on biosolids moisture content), indicating that, if a utility already uses energy to dry biosolids, then pyrolysis does not require a substantial amount of energy. However, if a utility produces wet biosolids, then implementing pyrolysis may be costly because of the energy required to dry the biosolids. The energy content of py-gas and py-oil was always greater than the energy required for pyrolysis.
- Subjects
PYROLYSIS; SEWAGE sludge; CHEMICAL reactions; BIOCHAR; RENEWABLE energy sources
- Publication
Water Environment Research (10614303), 2016, Vol 88, Issue 9, p804
- ISSN
1061-4303
- Publication type
Article
- DOI
10.2175/106143016X14609975747441