Journal
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
Volume 12, Issue -, Pages 74-79Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.algal.2015.07.007
Keywords
Hydrothermal liquefaction; Bio-crude oil; Nutrient recycle; Net energy yield
Categories
Funding
- NSF Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt) [EEC 1028968]
- US Department of Energy Energize New Mexico (EPSCoR) [DE-EE0006316]
- National Science Foundation [IIA-1301346]
- Office of the Vice President for Research at NMSU
- Ed & Harold Foreman Endowed Chair
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Hydrothermal liquefaction (HTL) provides a promising option for extracting bio-crude oil from wet algal biomass. One of the byproducts of HTL is an aqueous phase (AP) rich in organic carbon and nutrients. This study evaluated the hypothesis that recycling the AP to the cultivation step could enhance biomass productivity and net energy yield. Since the yields of bio-crude and nutrients post-HTL are functions of HTL reaction temperature, this study evaluated the impact of reaction temperature on net energy yield. Nutrient recycle experiments were conducted with a low-lipid, acidophilic strain, Galdieria sulphuraria, being developed for single-step removal of organic carbon, nitrogen and phosphorus from urban wastewater. G. sulphuraria was cultivated in different dilutions of the AP generated by HTL performed between 180 and 300 degrees C. Biomass productivity recorded in this study with recycled AP was greater than that in the control by a factor as much as 1.94. Estimates of net energy yields indicate the optimum temperature for the second-stage HTL bio-crude oil extraction from G. sulphuraria to be 280 to 300 degrees C. (C) 2015 Elsevier B. V. All rights reserved.
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