Click on “Download PDF” for the PDF version or on the title for the HTML version.
If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.
Pretreatment and Hydrothermal Liquefaction of Filamentous Algae Grown on Dairy Wastewater
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: 2018 ASABE Annual International Meeting 1801164.(doi:10.13031/aim.201801164)
Authors: Meshack A Audu, Huilin Wang, Tianbai Tang, David Arellano, Umakanta Jena, Juchao Yan, Catherine E Brewer
Keywords: biofuels, dairy wastewater treatment, energy recovery, filamentous algae, hydrothermal liquefaction.
. Hydrothermal liquefaction (HTL) is a thermochemical process that uses subcritical water (270-350°C and 8-18 MPa) both as a solvent and a reaction medium to convert organic biomass constituents into energy-rich bio-crude oil. HTL is most suitable for conversion of wet feedstocks including algae. In this study, we compare the oil yields and energy recoveries from the HTL of a filamentous algae polyculture grown on freshwater dairy effluent as part of a pilot-scale Algal Turf Scrubber® system at Eastern New Mexico University. Batch HTL conversion experiments were carried out in a 1.8 L autoclave reactor at reaction temperatures and retention times of 310 and 350°C, and 30 and 60 minutes, respectively. Algae and reaction conditions were compared based on product yields and the higher heating values (HHV) of the bio-crude oils. The light bio-crude oil (LBO) yield ranged from 11-15 wt. %, heavy bio-crude oil (HBO) yield and char yield were ranged from 5-6 wt. % and 13-20 wt. % respectively. Due to the algae‘s high ash content, the biomass was pretreated with several organic and inorganic acids to lower ash content prior to HTL to improve bio-crude oil yields. Future work will focus on bio-crude oil and char characterization and applications, and the evaluation of the dairy effluent wastewater treatment and renewable energy production combined process.
(Download PDF) (Export to EndNotes)