Chemically activated hydrochars as catalysts for the treatment of HTC liquor by catalytic wet air oxidation

de Mora, A.; Diaz de Tuesta, J.L.; Pariente, M.I.; Segura, Y.; Puyol, D.; Castillo, E.; Lissitsyna, K.; Melero, J.A.; Martínez, F.

doi:10.1016/j.cattod.2023.114462

Cited by 1 publication

(2 citation statements)

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“…Wet air oxidation (WAO) has proven to be an effective process for treating wastewater with high organic matter content, allowing the total or partial degradation of toxic or recalcitrant compounds for biological treatment (de Mora et al 2024 ). 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.…”

Section: Approaches To Improve Ad Performancementioning

confidence: 99%

“…Moreover, with the addition of catalysts, it was possible to eliminate these compounds almost completely. However, WAO was not as effective in removing pyrazines (de Mora et al 2024 ). Also, while WAO is an effective strategy to degrade a broad spectrum of process water contaminants simultaneously, it has its drawbacks.…”

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%