Co-pyrolysis of industrial sludge and rice straw: Synergistic effects of biomass on reaction characteristics, biochar properties and heavy metals solidification

Peng, Bo; Liu, Qingyu; Li, Xiaodi; Zhou, Zhixiong; Wu, Changshuo; Zhang, Huiyan

doi:10.1016/j.fuproc.2022.107211

Cited by 58 publications

(14 citation statements)

References 53 publications

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“…This may be because covalent bonds such as C–O and C–C were broken during the pyrolysis process and free radicals were generated after the formation of bio-oil vapor. Some free electrons were generated in this process and then trapped by Cu, which led to a change in the chemical form of Cu. , In addition, more FD addition caused a larger F4 fraction, which meant that FD could further reduce the potential risk of SS pyrolysis biochar. For Zn, the bioavailable fractions (F1 + F2) accounted for more than 50% in both SS and FD.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…130,132 Furthermore, heavy metals in sludge activate biochar and increase its specific surface area. 131 Zhou et al 133 prepared biochar via copyrolysis and used it as an adsorbent and found that adding sludge increased the iodine adsorption capacity of biochar from 445 to 653 mg/g. The result of activation was greatly affected by the temperature.…”

Section: Biochar From Copyrolysis Of Sludge and Biomassmentioning

confidence: 99%

“…Zhang et al found that adding sludge to biomass pyrolysis promoted aromatization and improved antioxidant stability of biochar and prepared the biochar with a high H/C value. In addition, some studies also found that metals in sludge were concentrated in biochar during copyrolysis and transformed into more stable forms, thus reducing the risk of environmental pollution. , Furthermore, heavy metals in sludge activate biochar and increase its specific surface area . Zhou et al prepared biochar via copyrolysis and used it as an adsorbent and found that adding sludge increased the iodine adsorption capacity of biochar from 445 to 653 mg/g.…”

Section: Copyrolysis Of Sludge and Biomassmentioning

confidence: 99%

Recent Advances and Perspectives of Copyrolysis of Biomass and Organic Solid Waste

Xing

et al. 2023

Energy Fuels

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Pyrolysis is one of the substantial thermal conversion technologies for high-value reutilization of biomass and organic solid waste (OSW). Adding some typical OSWs to biomass pyrolysis can achieve directional regulation of target products that are considered potential alternatives to fossil energy. Understanding copyrolysis behaviors is vital for the optimizing pyrolysis process to minimize environmental pollution and efficiently utilize biomass and OSW. However, there is no overall review on the copyrolysis of biomass and various OSWs. This paper reviews and discusses recent advances in the copyrolysis mechanism, thermal−chemical processes of some typical OSWs and biomass, and effects of chemical compositions of raw materials and pyrolysis parameters on thermal−chemical conversion behaviors, synergistic effect, and copyrolysis product characteristics. Recent reports show that the synergistic effect in copyrolysis effectively improves the quality of bio-oil and biochar. Moreover, adding OSW to biomass pyrolysis can promote the secondary reaction of pyrolysis intermediates. The reaction mechanism and relative numerical simulation work of copyrolysis are summarized. Finally, the current challenges to energy-and environment-oriented conversion of biomass and OSW are discussed, and perspectives for further developing the copyrolysis process are highlighted. This paper provides valuable information for optimizing sustainable copyrolysis processes of OSW and biomass and improving the efficiency and selectivity of recycled OSW.

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“…Moreover, the co-pyrolysed biochar prepared by co-pyrolysis had richer O-H and C-O bonds, and these oxygen-containing functional groups could fix lead. Previous studies have shown that rice straw and sludge co-pyrolysis biochar have more aromatic ring structures and higher skeleton strength than sewage sludge biochar, which will also enhance its ability to stabilize lead [12].…”

Section: Soil Adsorption 331 Leaching Toxicity Of Lead-contaminated Soilmentioning

confidence: 99%

Study on the adsorption characteristics of lead in soil by biochar from co-pyrolysis of rice straw and sludge

Wang

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The adsorption kinetics and short-term soil adsorption experiments were carried out for the biochar (mixed charcoal) prepared by co-pyrolysis of rice straw and sludge. The results showed that the specific surface area and total pore volume of co-pyrolysed biochar were significantly increased compared with sludge pyrolysis biochar. In the lead solution adsorption experiment, the removal rate of lead ions in the solution reached 99.34% using mixed-burning biochar produced at 600 °C for 24h, and the unit mass adsorption capacity was 64.57 mg/g. In the soil adsorption experiment, 12 g/kg of mixed charcoal was added to lead-contaminated soil, and the leaching toxicity and bioavailability of lead-contaminated soil after stabilization for 30 days decreased by 45.3% and 37.0%, respectively. The soil pH value with 12 g/kg of mixed charcoal added within 30 days fluctuated between 7.03 and 7.12, and no acid or alkaline pollution was generated. Co-pyrolysed biochar can effectively reduce the leaching toxicity and bioavailability of lead in soil. For soil with a lead pollution concentration of less than 1600 mg/kg, adding 12 to 16 g/kg of co-pyrolysed biochar produced at 600 °C can achieve a satisfactory repair effect.

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Co-pyrolysis of industrial sludge and rice straw: Synergistic effects of biomass on reaction characteristics, biochar properties and heavy metals solidification

Cited by 58 publications

References 53 publications

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

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

Recent Advances and Perspectives of Copyrolysis of Biomass and Organic Solid Waste

Study on the adsorption characteristics of lead in soil by biochar from co-pyrolysis of rice straw and sludge

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