Products distribution and interaction mechanism during co-pyrolysis of rice husk and oily sludge by experiments and reaction force field simulation

Wen, Yushi; Xie, Yingshen; Jiang, Chi; Li, Wenxuan; Hou, Yingfei

doi:10.1016/j.biortech.2021.124822

Cited by 47 publications

(17 citation statements)

References 43 publications

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“…The TG-DTG curves of SS-RD blends were located between the TG-DTG curves of two single samples ( Figure 1 a,b), which was consistent with the results of other biomass and sludge mixings, such as rice husk and cotton stalks [ 25 , 26 ]. The final weight loss of 25, 50, and 75 wt.% RD was 50.2%, 59.1% and 69.4%, respectively.…”

Section: Resultssupporting

confidence: 86%

Co-Pyrolysis of Sewage Sludge and Wetland Biomass Waste for Biochar Production: Behaviors of Phosphorus and Heavy Metals

Gbouri

Wang

et al. 2022

IJERPH

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Large amounts of sewage sludge (SS) and wetland plant wastes are generated in the wastewater treatment system worldwide. The conversion of these solid wastes into biochar through co-pyrolysis could be a promising resource utilization scheme. In this study, biochar was prepared by co-pyrolysis of SS and reed (Phragmites australis, RD) using a modified muffle furnace device under different temperatures (300, 500, and 700 °C) and with different mixing ratios (25, 50, and 75 wt.% RD). The physicochemical properties of biochar and the transformation behaviors of phosphorus (P) and heavy metals during the co-pyrolysis process were studied. Compared with single SS pyrolysis, the biochar derived from SS-RD co-pyrolysis had lower yield and ash content, higher pH, C content, and aromatic structure. The addition of RD could reduce the total P content of biochar and promote the transformation from non-apatite inorganic phosphorus (NAIP) to apatite phosphorus (AP). In addition, co-pyrolysis also reduced the content and toxicity of heavy metals in biochar. Therefore, co-pyrolysis could be a promising strategy to achieve the simultaneous treatment of SS and RD, as well as the production of value-added biochar.

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Section: Resultssupporting

confidence: 86%

Co-Pyrolysis of Sewage Sludge and Wetland Biomass Waste for Biochar Production: Behaviors of Phosphorus and Heavy Metals

Gbouri

Wang

et al. 2022

IJERPH

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“… 33 Biomass decomposition is assumed to follow a first-order reaction which has been widely applied in previous works. 33 , 57 , 63 − 66 The rate constant can be described for each temperature by the following equation where k is the rate constant. α represents the degree of the reaction at any time t and can be defined as the fraction of the cleavage of C–C bonds.…”

Section: Results and Discussionmentioning

confidence: 99%

Pyrolysis Mechanism of Wheat Straw Based on ReaxFF Molecular Dynamics Simulations

Liu

Jin

2022

ACS Omega

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Biomass has played an increasingly important role in the consumption of energy worldwide because of its renewability and carbon-neutral property. In this work, the pyrolysis mechanism of wheat straw is explored using reactive force field molecular dynamics simulations. A large-scale wheat straw model composed of cellulose, hemicellulose, and lignin is built. After model validation, the temporal evolutions of the main pyrolysis products under different temperatures are analyzed. As the temperature rises, the gas production increases and the tar yield can decrease after peaking. Relatively high temperatures accelerate the generation rates of the main gas and tar species. CO and CO 2 molecules mainly come from the cleavage of CHO 2 radicals, and numerous H 2 O molecules are generated on account of dehydration. Moreover, the evolution of six functional groups and pyran and phenyl rings as well as three types of bonds is also presented. It is observed that the phenyl rings reflect improved thermostability. Finally, the pyrolytic kinetics analysis is conducted, and the estimated activation energy of wheat straw pyrolysis is found to be 56.19 kJ/mol. All these observations can help deeply understand the pyrolytic mechanism of wheat straw biomass.

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“…Here, we observed that, due to the complex reactions in the photocatalytic process within the rice husk extract, it was quite challenging to infer reaction mechanism that clearly explained all conversion reactions occurring in photocatalytic reaction of the rice husk extract. However, based on the reported literature [4,5,[43][44][45], it can be presumed herein that a series of reactions involving Brønsted and Lewis acids occurred, resulting in a variety of key products. A proposed mechanism is shown in Figure 10, in which major compounds present in the rice husk extract, are associated with photocatalytic conversion mechanisms in the presence of Zn-Fe LDH.…”

Section: Composition Of the Rice Husk Extract After The Photocatalyti...mentioning

confidence: 98%

“…Here, we observed that, due to the complex reactions in the photocatalytic process within the rice husk extract, it was quite challenging to infer a reaction mechanism that clearly explained all the conversion reactions occurring in photocatalytic reaction of the rice husk extract. However, based on the reported literature [4,5,[43][44][45], it can be presumed herein that a Alkanes after the photocatalytic reaction: Table 2 displays the data relevant to the peaks of alkane-containing compounds after the photocatalytic reaction. The amount of aliphatic compounds was high as compared to that of other compounds detected in the sample after the photocatalytic reaction.…”

Section: Composition Of the Rice Husk Extract After The Photocatalyti...mentioning

confidence: 99%

Visible-Light-Active Zn–Fe Layered Double Hydroxide (LDH) for the Photocatalytic Conversion of Rice Husk Extract to Value-Added Products

et al. 2022

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One of the major causes of excess CO2 in the atmosphere is the direct burning of biomass waste, which can be obviated by the photocatalytic biomass conversion to useful/valuable chemicals/fuels, a sustainable and renewable approach. The present research work is focused on the development of a novel Zn–Fe LDH by a simple co-precipitation method and its utilization for the photocatalytic conversion of a rice husk extract (extracted from rice husk by means of pyrolysis) to value-added products. The synthesized, pure Zn–Fe LDH was characterized by various analytical techniques such as XRD, SEM, FTIR, and UV–Visible DRS spectroscopy. The rice husk extract was converted in a photocatalytic reactor under irradiation with 75 W white light, and the valued-added chemicals were analyzed by gas chromatography–mass spectrometry (GC–MS). It was found that the compounds in the rice husk extract before the photocatalytic reaction were mainly carboxylic acids, phenols, alcohols, alkanes (in a small amount), aldehydes, ketones, and amines. After the photocatalytic reaction, all the carboxylic acids and phenols were completely converted into alkanes by complex reactions. Hence, photocatalytic biomass conversion of a rice husk extract was successfully carried out in the present experimental work, opening new avenues for the development of related research domains, with a great potential for obtaining an alternate fuel and overcoming environmental pollution.

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Products distribution and interaction mechanism during co-pyrolysis of rice husk and oily sludge by experiments and reaction force field simulation

Cited by 47 publications

References 43 publications

Co-Pyrolysis of Sewage Sludge and Wetland Biomass Waste for Biochar Production: Behaviors of Phosphorus and Heavy Metals

Co-Pyrolysis of Sewage Sludge and Wetland Biomass Waste for Biochar Production: Behaviors of Phosphorus and Heavy Metals

Pyrolysis Mechanism of Wheat Straw Based on ReaxFF Molecular Dynamics Simulations

Visible-Light-Active Zn–Fe Layered Double Hydroxide (LDH) for the Photocatalytic Conversion of Rice Husk Extract to Value-Added Products

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