title: Chemical characterization and anaerobic biodegradability of hydrothermal liquefaction aqueous products from mixed-culture wastewater algae.
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.
authors.affiliation: Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, 1304 W Pennsylvania Avenue, Urbana, IL 61801, USA; Laboratory of Environmental Biotechnology, Department of Food Engineering, University of Sao Paulo, 225, Duque de Caxias Norte, Pirassununga, Sao Paulo 13635-900, Brazil.
authors.forename: Giovana
authors.initials: G
authors.lastname: Tommaso
authors.affiliation: Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, 1304 W Pennsylvania Avenue, Urbana, IL 61801, USA.
authors.forename: Wan-Ting
authors.initials: WT
authors.lastname: Chen
authors.affiliation: Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, 1304 W Pennsylvania Avenue, Urbana, IL 61801, USA.
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.affiliation: Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, 1304 W Pennsylvania Avenue, Urbana, IL 61801, USA.
authors.forename: Lance
authors.initials: L
authors.lastname: Schideman
authors.affiliation: Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, 1304 W Pennsylvania Avenue, Urbana, IL 61801, USA. Electronic address: yzhang1@illinois.edu.
authors.forename: Yuanhui
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D001709:Biotechnology / Q000379:methods*; D002087:Butyrates / Q000737:chemistry; D016466:CHO Cells; D006224:Cricetinae; D003412:Cricetulus; D004563:Electrochemistry; D008401:Gas Chromatography-Mass Spectrometry; D006838:Hydrocarbons / Q000737:chemistry; D008697:Methane / Q000737:chemistry; D019800:Phenol / Q000737:chemistry; D013696:Temperature; D014631:Valerates / Q000737:chemistry; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D002087:Butyrates; D006838:Hydrocarbons; D008697:Methane; D019800:Phenol; D014631:Valerates; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Algae; Anaerobic; Hydrothermal liquefaction aqueous product; Methane