Options for Removing Refractory Organic Substances in Pre-Treated Process Water from Hydrothermal Carbonization

Fettig, Joachim; Austermann-Haun, Ute; Meier, J. F.; Busch, Anna; Gilbert, Eva M.

doi:10.3390/w11040730

Cited by 4 publications

(2 citation statements)

References 30 publications

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“…The total organic carbon content in the HTC process water has been reported as high as in the order of grams per litre (Fettig et al, 2019). Naturally, process water with this composition cannot be discharged directly to the environment and would instead need to be either recirculated in the HTC process (Kambo et al, 2018) or subjected to some form of wastewater treatment (Fettig et al, 2019). Therefore, biological treatment of the HTC process water was set as a baseline scenario for the production of HC from wood biomass.…”

Section: Hydrochar End-of-life Scenarios (Hc I Hc L Hc Rg)mentioning

confidence: 99%

Comparative environmental assessment of end-of-life carbonaceous water treatment adsorbents

Kozyatnyk

Yacout

Caneghem

et al. 2020

Bioresource Technology

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Hydrochar End-of-life Scenarios (Hc I Hc L Hc Rg)mentioning

confidence: 99%

Comparative environmental assessment of end-of-life carbonaceous water treatment adsorbents

Kozyatnyk

Yacout

Caneghem

et al. 2020

Bioresource Technology

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“…The highest removal rate occurred at pH 7.5. When sufficient PO 4 3− is present in process water alongside TAN, only Mg 2+ is needed for struvite precipitation (Fettig et al 2019 ). Overall, pre-treating process water with struvite precipitation is an effective strategy to prevent TAN inhibition during AD.…”

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.

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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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Challenges and Opportunities of Agricultural Biomass as a Replacement for PCI Coal in the Ironmaking Blast Furnace: A Review

Abhi

MacDermid-Watts

Salaudeen

et al. 2023

J. Sustain. Metall.

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Options for Removing Refractory Organic Substances in Pre-Treated Process Water from Hydrothermal Carbonization

Cited by 4 publications

References 30 publications

Comparative environmental assessment of end-of-life carbonaceous water treatment adsorbents

Comparative environmental assessment of end-of-life carbonaceous water treatment adsorbents

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

Challenges and Opportunities of Agricultural Biomass as a Replacement for PCI Coal in the Ironmaking Blast Furnace: A Review

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