Study on co-hydrothermal treatment combined with pyrolysis of rice straw/sewage sludge: Biochar properties and heavy metals behavior

Tong, Sirui; Zhang, Shuping; Yin, Haoxin; Wang, Jiaxing; Chen, Minzi

doi:10.1016/j.jaap.2021.105074

Cited by 40 publications

(11 citation statements)

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“…The sewage sludge-derived biochar had a much lower leaching potential of heavy metals than the sewage sludge itself (Wang et al 2021d;Xiong et al 2021). Recently, co-pyrolysis of sewage sludge and waste biomass (e.g., rice straw, rice husk, cotton stalk, and sawdust) has been proven to improve the porous structure and reduce the leaching toxicity of heavy metals in sewage sludge-derived biochar (Tong et al 2021;Wang et al 2021dXiong et al 2021). Another study also reported that co-pyrolysis of sewage sludge and calcium sulfate was conducive to immobilizing heavy metals in sewage sludge-derived biochar (Liu et al 2021a).…”

Section: Biochar For Toxic Metal Immobilizationmentioning

confidence: 99%

Bibliometric analysis of biochar research in 2021: a critical review for development, hotspots and trend directions

Singh

Wang

et al. 2023

Biochar

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As a bioproduct from the thermal decomposition of biomass, biochar has various applications in diversified field. In this study, a bibliometric analysis was conducted to visualize the current research status and trends of biochar research. A total of 5535 documents were collected from the Web of Science Core Collection and subjected to visualization analysis for the biochar field's development in 2021 with CiteSpace software. The visual analysis results demonstrate that the number of publications expanded dramatically in 2021, and the growth trend would continue. China and USA were the most contributing countries in biochar research in terms of the number of publications. Based on the keyword co-occurrence analyses, “Biochar for toxic metal immobilization”, “Biochar-based catalyst for biofuel production”, “Biochar for global climate change mitigation”, “Biochar for salinity and drought stress amelioration”, “Biochar amendment in composting”, and “Biochar as additives in anaerobic digestion” were the main research trends and hotspots in this field in 2021. This indicates that the biochar research was multidisciplinary. Regarding the research hotspots, the employment of biochar as heterogeneous catalysts for biofuel production gained great attention in 2021. On the contrary, bioremediation using functional bacteria immobilized on biochar and biochar-assisted advanced oxidation process were well-studied but with less frequency than other topics in 2021. Furthermore, the future research was proposed for green and sustainable applications of biochar. This review provides a comprehensive overview of the research frontiers, the evolution of research hotspots, and potential future research directions in the biochar field. Graphical Abstract

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Section: Biochar For Toxic Metal Immobilizationmentioning

confidence: 99%

Bibliometric analysis of biochar research in 2021: a critical review for development, hotspots and trend directions

Singh

Wang

et al. 2023

Biochar

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“…The results showed that the increase in the F4 fraction of HMs after DR hydrothermal treatment was due to the complexation and precipitation reactions, where the unstable and loosely adsorbed fractions can be stabilized and re-combined into an organic mineral matrix, during the HTT process. 48,49 In combination with Fig. 7(b), the subsequent addition of fly ash led to a greater dilution than synergistic effect in the change of HM fractions.…”

Section: Resultsmentioning

confidence: 57%

Synergistic hydrothermal treatment of food waste digestate residues and incineration fly ash: dehydration performance and heavy metals safety

Wang

Lin

et al. 2022

React. Chem. Eng.

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“…This combined process not only effectively addresses HM content but also enhances the aromaticity and pore structure of the resultant biochar, thereby substantially augmenting its applicative value. 13,14 The generated biochar has potential in the adsorption and plant cultivation fields as a multifunctional material. 15,16 Meanwhile, the pyrolysis oil and gas produced during the pyrolysis process can provide energy input, reduce costs, and be clean and nonpolluting.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Coupled Pyrolytic Treatment of Sewage Sludge and Food Waste Digestate for Heavy Metal Immobilization and Biochar Properties Enhancement

Wang,

Xie,

2024

Energy Fuels

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Hydrothermal combined pyrolytic treatment is a promising technology for improving the dewaterability of sewage sludge (SS) and food waste digestate (FD) with additional heavy metal (HM) risk reduction. The effect of cohydrothermal coupled pyrolysis with different temperatures (300, 500, and 700 °C) at different mixture proportions (1:0, 3:1, 1:1, 1:3, and 0:1) on the migration and transformation of HMs was investigated. In addition, the effects on the properties of biochar and the assessment of the risk of HMs in biochar were studied. The results showed that the addition of FD increased the residual fractions of Cr, Zn, and Cd during the hydrothermal process of SS. Followingly, Cu and As were better immobilized in biochar from cohydrothermal combined pyrolytic treatment than SS treatment alone, with the low potential ecological risk (indices: 9.13−11.62) of biochar at 700 °C. In addition, cohydrothermal combined pyrolytic treatment (1:1, w/w) at 700 °C can significantly improve the aromaticity and specific surface area of SS biochar. This work reveals that the codisposal of SS and FD has superior application potential in HM immobilization and biochar property improvement.

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Study on co-hydrothermal treatment combined with pyrolysis of rice straw/sewage sludge: Biochar properties and heavy metals behavior

Cited by 40 publications

References 1 publication

Bibliometric analysis of biochar research in 2021: a critical review for development, hotspots and trend directions

Bibliometric analysis of biochar research in 2021: a critical review for development, hotspots and trend directions

Synergistic hydrothermal treatment of food waste digestate residues and incineration fly ash: dehydration performance and heavy metals safety

Hydrothermal Coupled Pyrolytic Treatment of Sewage Sludge and Food Waste Digestate for Heavy Metal Immobilization and Biochar Properties Enhancement

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