Wet air oxidation of HTL aqueous waste

Kilgore, Uriah J.; Subramaniam, Senthil; Fox, Samuel P.; Cronin, Dylan J.; Guo, Mond F.; Schmidt, Andrew J.; Ramasamy, Karthikeyan; Thorson, Michael R.

doi:10.1016/j.biombioe.2023.106889

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…During WAO, organic compounds are oxidized into primarily acetic acid and formic acid by applying high temperatures (175–350 ℃) and high O 2 /air pressures (20–90 bar), generating a stream of readily degradable compounds for subsequent AD treatment. For example, WAO treatment at 50 bar air pressure and 250 ℃ significantly reduced phenolic, ketone, aromatic, and olefin compounds in process water (Kilgore et al 2023 ). Moreover, with the addition of catalysts, it was possible to eliminate these compounds almost completely.…”

Section: Approaches To Improve Ad Performancementioning

confidence: 99%

“…One drawback is its high energy requirements for pressurization and heating (Silva Thomsen et al 2022 ). Another drawback is that WAO completely oxidizes a fraction of the organic compounds to CO 2 , precluding their recovery as biogas (Kilgore et al 2023 ). Finally, the scale-up of WAO is technically challenging and prohibitively expensive due to its high-pressure requirements.…”

Section: Approaches To Improve Ad Performancementioning

confidence: 99%

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Anaerobic digestion of process water from hydrothermal treatment processes: a review of inhibitors and detoxification approaches

Zhou,

Taiwo,

Wang

et al. 2024

Bioresour. Bioprocess.

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Integrating hydrothermal treatment processes and anaerobic digestion (AD) is promising for maximizing resource recovery from biomass and organic waste. The process water generated during hydrothermal treatment contains high concentrations of organic matter, which can be converted into biogas using AD. However, process water also contains various compounds that inhibit the AD process. Fingerprinting these inhibitors and identifying suitable mitigation strategies and detoxification methods is necessary to optimize the integration of these two technologies. By examining the existing literature, we were able to: (1) compare the methane yields and organics removal efficiency during AD of various hydrothermal treatment process water; (2) catalog the main AD inhibitors found in hydrothermal treatment process water; (3) identify recalcitrant components limiting AD performance; and (4) evaluate approaches to detoxify specific inhibitors and degrade recalcitrant components. Common inhibitors in process water are organic acids (at high concentrations), total ammonia nitrogen (TAN), oxygenated organics, and N-heterocyclic compounds. Feedstock composition is the primary determinant of organic acid and TAN formation (carbohydrates-rich and protein-rich feedstocks, respectively). In contrast, processing conditions (e.g., temperature, pressure, reaction duration) influence the formation extent of oxygenated organics and N-heterocyclic compounds. Struvite precipitation and zeolite adsorption are the most widely used approaches to eliminate TAN inhibition. In contrast, powdered and granular activated carbon and ozonation are the preferred methods to remove toxic substances before AD treatment. Currently, ozonation is the most effective approach to reduce the toxicity and recalcitrance of N and O-heterocyclic compounds during AD. Microaeration methods, which disrupt the AD microbiome less than ozone, might be more practical for nitrifying TAN and degrading recalcitrant compounds, but further research in this area is necessary. Graphical Abstract

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Section: Approaches To Improve Ad Performancementioning

confidence: 99%

Section: Approaches To Improve Ad Performancementioning

confidence: 99%

Anaerobic digestion of process water from hydrothermal treatment processes: a review of inhibitors and detoxification approaches

Zhou,

Taiwo,

Wang

et al. 2024

Bioresour. Bioprocess.

View full text Add to dashboard Cite

show abstract

“…Generally, the lignin conversion rate and production of aromatic aldehydes are significantly higher when using catalytic procedures compared to non-catalytic techniques. 41 Alkali pretreatment can aid in the removal of lignin and uronic acid from hemicellulose with minimal damage to cellulose. Hydrogen peroxide possesses greater oxidative power than oxygen and can accelerate the degradation of lignocellulosic material.…”

Section: Advancement In Oxidative Pretreatment Of Lcbsmentioning

confidence: 99%