Influence of temperature on nitrogen fate during hydrothermal carbonization of food waste

Wang, Tengfei; Zhai, Yunbo; Zhu, Yun; Peng, Chuan; Xu, Bibo; Wang, Tao; Li, Caiting; Zeng, Guangming

doi:10.1016/j.biortech.2017.09.076

Cited by 172 publications

(50 citation statements)

References 36 publications

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“…In Step 3, a low temperature hydrothermal reaction is intended to graft/anchor CuO nanosheets on PVDF fibers for stable applications. Previous reports of hydrothermal temperature were higher than 100 °C, even up to hundreds of degrees, which is not economical for scale up production owing to high energy consumption [38,39]. By contrast, the hydrothermal temperature in this study was as low as 60 °C, which was an energy saving approach and easy for scale up production.…”

Section: Resultscontrasting

confidence: 66%

Efficient Oil/Water Separation Membrane Derived from Super-Flexible and Superhydrophilic Core–Shell Organic/Inorganic Nanofibrous Architectures

et al. 2019

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To address the worldwide oil and water separation issue, a novel approach was inspired by natural phenomena to synthesize superhydrophilic and underwater superoleophobic organic/inorganic nanofibrous membranes via a scale up fabrication approach. The synthesized membranes possess a delicate organic core of PVDF-HFP and an inorganic shell of a CuO nanosheet structure, which endows super-flexible properties owing to the merits of PVDF-HFP backbones, and superhydrophilic functions contributed by the extremely rough surface of a CuO nanosheet anchored on flexible PVDF-HFP. Such an organic core and inorganic shell architecture not only functionalizes membrane performance in terms of antifouling, high flux, and low energy consumption, but also extends the lifespan by enhancing its mechanical strength and alkaline resistance to broaden its applicability. The resultant membrane exhibits good oil/water separation efficiency higher than 99.7%, as well as excellent anti-fouling properties for various oil/water mixtures. Considering the intrinsic structural innovation and its integrated advantages, this core–shell nanofibrous membrane is believed to be promising for oil/water separation, and this facile approach is also easy for scaled up manufacturing of functional organic/inorganic nanofibrous membranes with insightful benefits for industrial wastewater treatment, sensors, energy production, and many other related areas.

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Section: Resultscontrasting

confidence: 66%

Efficient Oil/Water Separation Membrane Derived from Super-Flexible and Superhydrophilic Core–Shell Organic/Inorganic Nanofibrous Architectures

et al. 2019

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“…Results show that the nitrogen content from the raw biomass (4.89 wt.%, daf) stayed at the same level in hydrochars (4.67 wt.% daf), despite the mass loss upon hydrochar production in the conversion process. It leads to a strong conclusion that a part of the feedstock nitrogen had to be transferred into the process water in the form of organic compounds [24]. Table 2 presents char yield and proximate and ultimate analysis results for pyrochars.…”

Section: Feedstocks Characteristicsmentioning

confidence: 99%

Pyrolysis Kinetics of Hydrochars Produced from Brewer’s Spent Grains

et al. 2019

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The current market situation shows that large quantities of the brewer’s spent grains (BSG)—the leftovers from the beer productions—are not fully utilized as cattle feed. The untapped BSG is a promising feedstock for cheap and environmentally friendly production of carbonaceous materials in thermochemical processes like hydrothermal carbonization (HTC) or pyrolysis. The use of a singular process results in the production of inappropriate material (HTC) or insufficient economic feasibility (pyrolysis), which hinders their application on a larger scale. The coupling of both processes can create synergies and allow the mentioned obstacles to be overcome. To investigate the possibility of coupling both processes, we analyzed the thermal degradation of raw BSG and BSG-derived hydrochars and assessed the solid material yield from the singular as well as the coupled processes. This publication reports the non-isothermal kinetic parameters of pyrolytic degradation of BSG and derived hydrochars produced in three different conditions (temperature-retention time). It also contains a summary of their pyrolytic char yield at four different temperatures. The obtained KAS (Kissinger–Akahira–Sunose) average activation energy was 285, 147, 170, and 188 kJ mol−1 for BSG, HTC-180-4, HTC-220-2, and HTC-220-4, respectively. The pyrochar yield for all hydrochar cases was significantly higher than for BSG, and it increased with the severity of the HTC’s conditions. The results reveal synergies resulting from coupling both processes, both in the yield and the reduction of the thermal load of the conversion process. According to these promising results, the coupling of both conversion processes can be beneficial. Nevertheless, drying and overall energy efficiency, as well as larger scale assessment, still need to be conducted to fully confirm the concept.

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“…16 Since the 1980s, when the Shell Oil Company applied this biomass conversion technology for the first time, 16 extensive work has been conducted on the hydrothermal treatment of biomass. 18,19 One of the main advantages of the hydrothermal treatment is that it uses water as the reaction medium. This dispenses with the need of using a high energy-consuming drying step and permits processing wet biomasses and slurries, which increases the energy efficiency of the process compared to classical methods such as pyrolysis and/or combustion.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted hydrothermal treatments for biomass valorisation: a critical review

2021

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Influence of temperature on nitrogen fate during hydrothermal carbonization of food waste

Cited by 172 publications

References 36 publications

Efficient Oil/Water Separation Membrane Derived from Super-Flexible and Superhydrophilic Core–Shell Organic/Inorganic Nanofibrous Architectures

Efficient Oil/Water Separation Membrane Derived from Super-Flexible and Superhydrophilic Core–Shell Organic/Inorganic Nanofibrous Architectures

Pyrolysis Kinetics of Hydrochars Produced from Brewer’s Spent Grains

Microwave-assisted hydrothermal treatments for biomass valorisation: a critical review

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