Characterization of products from hydrothermal carbonization of orange pomace including anaerobic digestibility of process liquor

Erdoğan, Ergun; Atila, Buse; Mumme, Jan; Reza, M. Toufiq; Toptas, Aslı; Elibol, Murat; Yanık, Jale

doi:10.1016/j.biortech.2015.06.115

Cited by 204 publications

(101 citation statements)

References 31 publications

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“…Methane production began immediately in assays 1–2, 1–1 and 2.5–2, reaching final figures of 144±1, 158±4 and 177±5 mL CH 4 STP g ‐1 COD added , respectively. These yield values are lower than the observed for the anaerobic digestion of the liquid fraction from HTC of agricultural residues like thin stillage or orange pomace, where 300 and 213 mL CH 4 STP g ‐1 COD, were reported, respectively, or mixed sewage sludge, with 257 mL CH 4 g ‐1 COD, but fairly similar to that obtained by Weiner et al for the liquid fraction from HTC of chaff using organosolv as the liquid source for carbonisation (174±9 mL CH 4 g ‐1 COD) or by Wirth et al for the liquid fraction from HTC of digested sewage sludge as sole substrate operating in continuous feed mode (120–180 mL CH 4 STP g ‐1 COD added ). For all the other conditions tested, inhibition of the methanogenic stage occurred, suggesting that not only the ISR but also the IC affect methane production.…”

Section: Resultssupporting

confidence: 82%

“…Besides, the HTC conditions (temperature and time) affect the CODt. Values around 60 g L ‐1 have been reported from HTC of food waste or orange pomace and somewhat lower values (40–50 g L ‐1 ) have been obtained from agro‐industrial residues like chaff, corn silage or thin stillage, while for HTC of primary sewage, mixture of primary and secondary sludge and digested municipal sewage sludge, values of 23, 52.5 and 34 g L ‐1 , respectively, have been reported . Therefore, the liquid fraction from HTC, needs to be conveniently managed before final discharge and moreover its high organic load offers potential interest for the sake of valorisation.…”

Section: Introductionmentioning

confidence: 99%

“…Anaerobic digestion of that liquid fraction has been suggested as a potential route to optimise energy recovery . However, the potential to produce methane from the liquid fraction of HTC has rarely been studied and the existing information deals mainly with lignocellulosic residues . Qiao et al .…”

Section: Introductionmentioning

confidence: 99%

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Valorisation of the liquid fraction from hydrothermal carbonisation of sewage sludge by anaerobic digestion

Villamil

Mohedano

Rodrı́guez

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND The mesophilic anaerobic digestion of the liquid fraction from hydrothermal carbonisation (208°C, 1 h) of dehydrated sewage sludge has been studied. Two initial inoculum concentrations (IC) (10 and 25 g COD L‐1) and four inoculum to substrate ratios (ISR) (2, 1, 0.5 and 0.4 on a COD basis) have been selected to analyse their influence on the evolution of the anaerobic digestion process. RESULTS The substrate is characterised by a high COD (95.5 g L‐1) and TKN (8.7 g N L‐1) values. High inoculum concentration (25 g COD L‐1) and/or low ISR (≤ 0.5) inhibited methanogenesis due to the high ammonia nitrogen (1.4 g TAN L‐1) and VFA (>4 g COD L‐1) released. For the inhibited samples final COD removals lower than 15% and IA/TA ratios higher than 0.3 were found. The greatest methane yield (177±5 mL CH4 STP g‐1 CODadded) was achieved at 25 g COD L‐1 of IC and at an ISR of 2. CONCLUSION During anaerobic digestion of the liquid fraction from the hydrothermal carbonisation of sewage sludge, the IC and ISR must be adequately selected for proper operation of the process and successful valorisation. According to the results, working at an ISR ≥ 1 is recommended. © 2017 Society of Chemical Industry

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Valorisation of the liquid fraction from hydrothermal carbonisation of sewage sludge by anaerobic digestion

Villamil

Mohedano

Rodrı́guez

et al. 2017

J of Chemical Tech & Biotech

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“…The diagram provided further evidence about the transformation (dehydration, decarboxylation, and demethanation reactions) that took place in the chemical structure of glucose during the microwave-assisted hydrothermal carbonization process. The transformation from the starting material (glucose) to the hydrochar samples follows a diagonal line due to decrease in the O/C and H/C ratios, suggesting dehydration reactions as prevalent reaction during the process, which is consistent with previous reports [9,28].…”

Section: Elemental Composition Of the Prepared Hydrocharssupporting

confidence: 91%

Chemical, structural and energy properties of hydrochars from microwave-assisted hydrothermal carbonization of glucose

Elaigwu

Greenway

2016

Int J Ind Chem

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Hydrothermal carbonization has been used as a green and effective technique for the preparation of hydrochars from simple carbohydrates, such as glucose. The chemical and structural properties of hydrochars prepared from glucose have been studied. However, the energy properties of hydrochars prepared from microwaveassisted hydrothermal carbonization of glucose have not been studied. Thus, in this study, microwave-assisted hydrothermal carbonization of glucose, and the energy properties of the prepared hydrochars are reported. The preparation involved heating glucose in de-ionized water at 200°C for 5-60 min in a microwave oven. The prepared hydrochars were characterized using scanning electron microscope, nitrogen sorption measurement, Fourier transform infrared spectroscopy, elemental (CHN) analyzer, and nuclear magnetic resonance, and their energy properties studied. The result indicated that, in comparison with previous studies using the classical hydrothermal carbonization process, this approach reduced the processing time greatly from hours to 45 min, while the increase in higher heating value of the hydrochar when compared to that of the starting material was higher in this study than some value previously reported.

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“…Hydrothermal carbonization (HTC) is a simple biomass carbonization process, which offers many advantages such as generation of carbon at lower temperatures (<250 °C) than that required for other carbonization protocols such as ignition, pyrolysis, and gasification . During HTC, biomass is processed in hot pressurized water, excluding the energy intensive pre‐drying step .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of carbon microspheres from rubber wood by hydrothermal carbonization

Khan

Kim

Gupta

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND Carbon is the raw material for many commercial products; conventionally their production is from non‐renewable sources such as petroleum coke, pitch and coal. Recently carbon has been obtained from bioresources because of their renewability and high lignocellulosic content. This article details the synthesis of carbon microspheres from rubber wood, which is one of the largest commodity plants, via hydrothermal carbonization (hydrothermal rubber wood carbon; HTRW carbon) and evaluation of their characteristics. RESULTS Two sets of carbon were synthesized: (i) in the first set, excess of water (20–40 × weight of biomass) was used in the hydrothermal process at 180–260 °C for 3–9 h; and (ii) in the second set, water ratio was 25–35 × weight of biomass and the hydrothermal carbonization (HTC) reaction temperature was fixed at 260 °C. The H/C and O/C ratios of starting rubber wood were ∼1.78 and ∼0.85, respectively, which upon processing through the first strategy resulted in H/C ∼0.78 and O/C ∼0.29; thereby suggesting increased condensation under HTC. On the other hand, the carbonization process was accelerated by water when the temperature was maintained at 260 °C; Fourier transform infrared (FTIR) studies show that this carbon has a different chemical structure from the starting rubber wood. Scanning electron microscopy (SEM) images showed that HTRW carbon was in the form of microspheres (size ∼1.5–5 µm). CONCLUSION HTRW carbon with carbon content as high as 68% was developed from rubber wood biomass by hydrothermal processing of a mixture containing 35 times more water than the solid raw biomass at a temperature of 260 °C for 7 h. © 2018 Society of Chemical Industry

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Characterization of products from hydrothermal carbonization of orange pomace including anaerobic digestibility of process liquor

Cited by 204 publications

References 31 publications

Valorisation of the liquid fraction from hydrothermal carbonisation of sewage sludge by anaerobic digestion

Valorisation of the liquid fraction from hydrothermal carbonisation of sewage sludge by anaerobic digestion

Chemical, structural and energy properties of hydrochars from microwave-assisted hydrothermal carbonization of glucose

Synthesis and characterization of carbon microspheres from rubber wood by hydrothermal carbonization

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