Abstract
This study examined the chemical characteristics and the anaerobic degradability of the aqueous product from hydrothermal liquefaction (HTL-ap) from the conversion of mixed-culture algal biomass grown in a wastewater treatment system. The effects of the HTL reaction times from 0 to 1.5. h, and reaction temperatures from 260. °C to 320. °C on the anaerobic degradability of the HTL-ap were quantified using biomethane potential assays. Comparing chemical oxygen demand data for HTL-ap from different operating conditions, indicated that organic matter may partition from organic phase to aqueous phase at 320. °C. Moderate lag phase and the highest cumulative methane production were observed when HTL-ap was obtained at 320. °C. The longest lag phase and the smallest production rate were observed in the process fed with HTL-ap obtained at 300. °C. Nevertheless, after overcoming adaptation issues, this HTL-ap led to the second highest accumulated specific methane production. Acetogenesis was identified as a possible rate-limiting pathway.
Original language | English (US) |
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Pages (from-to) | 139-146 |
Number of pages | 8 |
Journal | Bioresource Technology |
Volume | 178 |
DOIs | |
State | Published - Feb 1 2015 |
Keywords
- Algae
- Anaerobic
- Hydrothermal liquefaction aqueous product
- Methane
ASJC Scopus subject areas
- Bioengineering
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal