Study on the bio-oil characterization and heavy metals distribution during the aqueous phase recycling in the hydrothermal liquefaction of As-enriched Pteris vittata L. (December 2020)

• Record Type: Journal Article
• Authors: Jiang, Haiwei; Fan, Liangliang; Cai, Chang; Hu, Ying; Zhao, Fenghua; Ruan, Roger; Yang, Weiran
• Is Part Of: Bioresource technology. Volume 317(2020)
• Publication Date: 2020-12
• Subjects: Hyper-accumulator biomass -- Hydrothermal liquefaction -- Aqueous phase recycling -- Heavy metals distribution -- Bio-oil; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.124031
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Aqueous phase recycling of Pteris vittata L. HTL was investigated. The yield and quality of bio-oil were increased by aqueous phase recycling. The low pH of aqueous phase indicated the presence of acids, which acted as catalyst. The O/C and H/C ratios implied that the deoxygenation was occurred in HTL. Cu, Pb, Zn and Cd remained in bio-char whereas As was transferred to aqueous phase. Abstract: The hydrothermal liquefaction (HTL) of As enriched Pteris vittata L. (PVL, hyper-accumulator biomass) was performed with the recycled aqueous phase as reaction medium, aiming to dispose the biomass with high water content and produce high-quality bio-oil. After three times of aqueous phase recycling at 275 °C, 30 min, the bio-oil yield increased to 30.32% from 21.54% and the higher heating value (HHV, 28.51 MJ/kg) of the bio-oil was higher than that of the bio-oil from HTL with pure water (26.80 MJ/kg). The main compounds detected in bio-oils were phenols, ketones, hydrocarbons, and aldehydes. Acetic acid (17.21–24.77 mg/mL) was dominant in the aqueous phases, resulting in the low pH (4.31–4.89). The heavy metals (Cu, Pb, Zn, Cd) mainly remained in bio-char whereas As was transferred to aqueous phase. Thus, HTL by aqueous phase recycling could be a promising way for PVL treatment to obtain high-quality bio-oil and arsenic recovery.