Effects of reaction conditions on products and elements distribution via hydrothermal liquefaction of duckweed for wastewater treatment. (December 2020)

• Record Type: Journal Article
• Authors: Chen, Guanyi; Yu, Yingying; Li, Wanqing; Yan, Beibei; Zhao, Kaige; Dong, Xiaoshan; Cheng, Zhanjun; Lin, Fawei; Li, Liping; Zhao, Hai; Fang, Yang
• Is Part Of: Bioresource technology. Volume 317(2020)
• Publication Date: 2020-12
• Subjects: Hydrothermal liquefaction -- Duckweed -- Wastewater treatment -- Products distribution -- Product characterization; 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.2020.124033
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: The duckweed for wastewater treatment was converted to bio-oil by HTL. The highest bio-oil yield (35.6 wt%) and HHV (40.85 MJ/kg) were obtained at 370 °C. The products of each phase had potential utilization value. Abstract: Wastewater treatment by duckweed is a naturally sustainable technology. However, its development is limited due to the lack of a follow-up treatment of duckweed. The duckweed was proposed for the treatment of rural domestic wastewater and agricultural wastewater, and it was further processed to produce bio-oil via hydrothermal liquefaction at various temperatures (250 °C–370 °C) and residence times (15–60 min). The highest bio-oil yield of 35.6 wt% was obtained at 370 °C, 45 min. The higher heating value of bio-oil was 40.85 MJ/kg, and the H/C ratio (1.72–1.98) was similar to that of petroleum (1.84). The gas chromatography-mass spectrometry analysis results revealed that the bio-oil mainly consisted of N-heterocycles, cyclic ketones, esters, amides, long-chain hydrocarbons, phenols, and aromatic intermediates. Valuable compounds (3-pyridinol, 2-pyrrolidinone, and its analogues) of high concentration were identified in the water-soluble organic matter. Compared with other materials, this study produced higher-quality bio-oil and water-soluble organic matter.