Anaerobic and aerobic degradation of wastewater from hydrothermal carbonization (HTC) in a continuous, three-stage and semi-industrial system

Weide, Tobias; Brügging, Elmar; Wetter, Christof

doi:10.1016/j.jece.2019.102912

Cited by 40 publications

(12 citation statements)

References 25 publications

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“…The performances of a continuously stirred-tank reactor (CSTR) and an anaerobic filter (AF) were compared by Wirth and Mumme [92] in treating HTC process water, showing a higher stability of the AF reactor. Interestingly, Weide et al [128] investigated the combined anaerobic and aerobic degradation of process waters from HTC of sewage sludge and wood in a continuous two anaerobic stages followed by one aerobic stage semi-industrial system. By applying two volumetric loadings, namely 0.44 and 0.88 g COD•L −1 •d −1 , in the anaerobic step, the authors obtained 254 and 296 L•kg oDM −1 of methane, respectively, as well as COD reductions of 58% and 55%.…”

Section: Hydrothermal Carbonization Process Waters Valorizationmentioning

confidence: 99%

Process Waters from Hydrothermal Carbonization of Sludge: Characteristics and Possible Valorization Pathways

Langone

Basso

2020

IJERPH

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Hydrothermal carbonization (HTC) is an innovative process capable of converting wet biodegradable residues into value-added materials, such as hydrochar. HTC has been studied for decades, however, a lack of detailed information on the production and composition of the process water has been highlighted by several authors. In this paper the state of the art of the knowledge on this by-product is analyzed, with attention to HTC applied to municipal and agro-industrial anaerobic digestion digestate. The chemical and physical characteristics of the process water obtained at different HTC conditions are compared along with pH, color, organic matter, nutrients, heavy metals and toxic compounds. The possibility of recovering nutrients and other valorization pathways is analyzed and technical feasibility constraints are reported. Finally, the paper describes the main companies which are investing actively in proposing HTC technology towards improving an effective process water valorization.

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Section: Hydrothermal Carbonization Process Waters Valorizationmentioning

confidence: 99%

Process Waters from Hydrothermal Carbonization of Sludge: Characteristics and Possible Valorization Pathways

Langone

Basso

2020

IJERPH

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“…As the lignin fraction was low, and was only partly hydrolysed, the phenol content was accordingly low. Unfortunately, the concentration of phenols is important in view of an aerobic or an anaerobic treatment of PW [89]. It is very important that a recirculation only slightly increases or decreases the amount of phenols in the PW.…”

Section: Effect On Lignin-based Reaction Productsmentioning

confidence: 99%

Process Water Recirculation During Hydrothermal Carbonization as a Promising Process Step Towards the Production of Nitrogen-Doped Carbonaceous Materials

Wüst

Pablo

Habicht³

et al. 2021

Waste Biomass Valor

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Hydrothermal Carbonization (HTC) refers to the conversion of biogenic wastes into char-like solids with promising perspectives for application, but a process water (PW) results which is difficult to dispose untreated. Thus, a biorefinery approach including one or two recirculation steps with the additional objective of improving the physico-chemical characteristics of the solid was performed in this study. During HTC, constitutive molecules such as saccharides, proteins and lignin of Brewer’s Spent Grains decompose into hundreds of organic compounds, following complex reactions. To get deeper insights a combination of proximate, ultimate and structural analysis for solid products as well as liquid chromatography for liquid products were the choice. The main reactions could be identified by key compounds of low and high molecular weight resulting from hydrolysis, dehydration, decarboxylation, deamination as well as amide formation and condensation reactions. Their intensity was influenced by the feedwater pH and reaction temperature. Via reactions of Maillard character up to around 90% of the dissolved nitrogen of the recirculated process water at 200, 220 and 240 °C result in the formation of nitrogen containing heterocycles or rather Quartnernary nitrogen incorporated into the hydrochar (HC). Thus, already one recirculation step during HTC at 240 °C promises the fabrication of high added-value materials, i.e. nitrogen doped carbonaceous materials. Graphic Abstract

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“…The gas quantity and quality was analyzed daily. Analytical methods for gas analysis, COD, and pH were as stated in previous studies [11,12]. Considering H 2 concentrations, a maximum of 34 vol % (mean) was reached and thus were comparatively low.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…DF follows this same transformation path but stops before methanogenesis. Since the process is highy similar to anaerobic digestion, organic waste and wastewater are also suitable for DF , . However, substrates must be rich in carbohydrates, which significantly limit the feedstock choices .…”

Section: Introductionmentioning

confidence: 99%

Biohydrogen Production via Dark Fermentation with Pig Manure and Glucose Using pH‐Dependent Feeding

et al. 2020

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Process controls for mesophilic dark fermentation using a pH-dependent feeding strategy without NaOH addition were examined. One reactor utilizing microorganism holdback and two continuously stirred-tank reactors (CSTRs) with the same volume were employed. These were fed with pig manure and glucose as cosubstrates. Different hydraulic retention times were applied. The target pH was 5.5 within a limited range and controlled by varying organic loading rate. When the pH target interval was exceeded, the hydrogen production rate (HPR) decreased, and CH 4 was produced. A pH below the target interval had positive effects on the HPR.

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Anaerobic and aerobic degradation of wastewater from hydrothermal carbonization (HTC) in a continuous, three-stage and semi-industrial system

Cited by 40 publications

References 25 publications

Process Waters from Hydrothermal Carbonization of Sludge: Characteristics and Possible Valorization Pathways

Process Waters from Hydrothermal Carbonization of Sludge: Characteristics and Possible Valorization Pathways

Process Water Recirculation During Hydrothermal Carbonization as a Promising Process Step Towards the Production of Nitrogen-Doped Carbonaceous Materials

Biohydrogen Production via Dark Fermentation with Pig Manure and Glucose Using pH‐Dependent Feeding

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