Integrated process for catalytic upgrading of hydrothermal liquefaction aqueous phase in the supercritical state

Frontiers in Chemical Engineering, Journal Year: 2025, Volume and Issue: 7

Published: March 14, 2025

Hydrothermal liquefaction (HTL) is a waste agnostic process that leverages near-critical water to break down macromolecules, forming an energy-dense biocrude. Some carbon contained in the feed lost aqueous phase, where its high organic content and unusual speciation are burdensome for municipal wastewater resource recovery facilities (WRRF). Treating phase adds undesirable cost HTL process, reducing attractiveness. Here, we report supercritical upgrading (AP-SCU) as new catalytic technology reduces of with co-production supplemental The provides sufficient catalyst activity conversion, energy inefficiency by eliminating need evaporation, extends lifetime relative liquid state. AP-SCU was evaluated at 380–440 ° C 24 MPa representative produced from treatment food waste. Using ZSM-5 bound silica sol, reduced 64%–73% corresponding production aromatic hydrocarbons including phenol 2-pentanone. total nitrogen approximately 10%. Additionally, facilitated reduction denitrogenation reactions compounds produce pyridine which more closely resemble After 3 h on stream, experienced coke formation, surface degradation led acid sites area. balance system closed through analysis aqueous, solid, gas phases estimate biocrude yield varies 43%–57% basis. An integrated showed operating unit 380 id="m2">° yielded minimum demand removal 63 MJ/kg-TOC. This value greater than conventional WRRFs (37.9 MJ/kg-TOC) but 10-times less emerging technologies designed handle complex feeds. has potential efficient effective TOC simultaneous offset demand.

Language: Английский

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Biochar Facilitated Direct Interspecies Electron Transfer in Anaerobic Digestion to Alleviate Antibiotics Inhibition and Enhance Methanogenesis: A Review

International Journal of Environmental Research and Public Health, Journal Year: 2023, Volume and Issue: 20(3), P. 2296 - 2296

Published: Jan. 27, 2023

Efficient conversion of organic waste into low-carbon biofuels such as methane through anaerobic digestion (AD) is a promising technology to alleviate energy shortages. However, issues inefficient production and poor system stability remain for AD technology. Biochar-facilitated direct interspecies electron transfer (DIET) has recently been recognized an important strategy improve performance. Nonetheless, the underlying mechanisms biochar-facilitated DIET are still largely unknown. For this reason, review evaluated role mechanism in enhancing First, evolution was introduced. Then, applications alleviating antibiotic inhibition methanogenesis were summarized. Next, electrochemical including electrical conductivity, redox-active characteristics, activity discussed. It can be concluded that biochar increased abundance potential microorganisms, facilitated microbial aggregation, regulated DIET-associated gene expression mechanism. Finally, we also discussed challenges practical application. This elucidated by system, which would advance our understanding underpinning interaction microorganisms. evidence occurrence requires further investigation.

Language: Английский

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Assessment of the effects of biochar on biogas production during anaerobic digestion of aqueous pyrolysis condensate: A circular economy approach

Journal of environmental chemical engineering, Journal Year: 2023, Volume and Issue: 11(3), P. 109982 - 109982

Published: April 22, 2023

Language: Английский

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Adsorption enhanced biological treatment of hydrothermal liquefaction aqueous phase derived from municipal sludge

Bioresource Technology, Journal Year: 2024, Volume and Issue: 407, P. 131093 - 131093

Published: July 8, 2024

Hydrothermal liquefaction (HTL) is a promising method for municipal sludge valorization through waste minimization and biofuel production. The process wastewater, HTL aqueous, presents significant challenge scale-up due to recalcitrant compounds. In this study, granular activated carbon (GAC) was used remove potential inhibitors from aqueous adsorption enhance aerobic anaerobic biological treatment. GAC removed up 61 % chemical oxygen demand (COD), 50 biochemical (BOD) inhibitors, such as total phenolic compounds (87 %) N-heterocycles (90 of pyridines) at 100 g/L. Conversely, most volatile fatty acids remained in aqueous. Subsequently, mesophilic thermophilic specific methane increased by 97 83 %, respectively. BOD which enhanced BOD/COD ratio 81 93 before after adsorption. This study established the groundwork adsorption, described mechanism pollutant removal, provided insights

Language: Английский

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Effects of micro-magnetite on anaerobic co-digestion of waste activated sludge and slaughterhouse waste: Microbial community and metabolism analyses

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 379, P. 124896 - 124896

Published: March 7, 2025

Language: Английский

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