Optimization of biochar quality and yield from tropical timber industry wastes

Veeyee, Kewir Fannyuy; Canu, Paolo

doi:10.1016/j.wasman.2021.06.017

Cited by 15 publications

(3 citation statements)

References 25 publications

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“…The differences in the biochar yields may be largely due to the different composition of the feedstocks and the pyrolytic conditions, such as the heating rate and pyrolysis temperature [32][33][34]. Notably, with reference to the previously described methods [26,27], the pecan biochars were prepared under a limited-oxygen atmosphere with no inert gas flow in this study, although various methods involved in the filling of inert gas have been reported to be performed in biochar preparation, such as the application of different types of inert gas [32,33,35], gas flow rates [30,31,36], and gas filling time [17,37,38]. As reported before, the changes in the reaction atmosphere could also impart different effects on the biochar yield or other properties [30][31][32][33].…”

Section: Biochar Yieldmentioning

confidence: 99%

“…Notably, with reference to the previously described methods [26,27], the pecan biochars were prepared under a limited-oxygen atmosphere with no inert gas flow in this study, although various methods involved in the filling of inert gas have been reported to be performed in biochar preparation, such as the application of different types of inert gas [32,33,35], gas flow rates [30,31,36], and gas filling time [17,37,38]. As reported before, the changes in the reaction atmosphere could also impart different effects on the biochar yield or other properties [30][31][32][33]. For example, the corn stover biochars produced at 500 • C under pure N 2 and a mixture of 5% oxygen and 95% N 2 had the yields of 26.8% and 17.8%, respectively, with the yield difference of 9% [35].…”

Section: Biochar Yieldmentioning

confidence: 99%

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Feedstock-Induced Changes in the Physicochemical Characteristics of Biochars Produced from Different Types of Pecan Wastes

Zhang,

Peng,

et al. 2024

Forests

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Large amounts of residues are generated in pecan cultivation processes. Biochar is an environmentally friendly way to utilize residues but attempts to prepare and apply biochar with pecan residues are rare. In this study, six types of biochars were produced from pecan branches, trunks, roots, nutshells, husks, and leaves under pyrolysis, and their physicochemical properties were compared to assess their application perspective in environmental and agricultural fields. The yields of six pecan biochars were 32.1%–45.9%, with the highest yield for husk biochar (HB) (45.9%). Among the pecan biochars, trunk biochar (TB) and root biochar (RB) had much larger specific surface areas. Branch biochar (BB), TB, and RB presented tubular structures with elliptical pores, while nutshell biochar (NSB), HB, and leaf biochar (LB) appeared flaky or as clustered structures with relatively rougher outer surfaces and irregular pores. The functional group types of pecan biochars were generally similar, but the intensities of the peak near 2900 cm−1 in BB were obviously higher than those of the other biochars. RB and LB contained significantly more ash and volatile than those of the other pecan biochars, with the highest fixed carbon content being found in NSB (70.1%). All of the pecan biochars were alkaline (7.90–9.87), and HB, LB, and NSB had significantly higher pH values than those of the other biochars. Elemental analysis indicated that RB, NSB, and LB had higher carbon levels (more than 70%) with lower O/C ratios (no more than 0.2). HB possessed a relatively high content of nitrogen, potassium, magnesium; the phosphorus content was highest in NSB; LB had the highest calcium content. The results of principal component analysis showed that BB, LB, and NSB were clustered in the same quadrant with relatively close relationships. The results of this study can guide the utilization of pecan wastes and their application as biochar in different fields.

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Section: Biochar Yieldmentioning

confidence: 99%

Section: Biochar Yieldmentioning

confidence: 99%

Feedstock-Induced Changes in the Physicochemical Characteristics of Biochars Produced from Different Types of Pecan Wastes

Zhang,

Peng,

et al. 2024

Forests

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“…Pyrolysis temperature and inorganic content are considered parameters which crucially affect biochar yield [29] and ash content [30,31]. Table 1 shows the percentages in mass yield of biochar obtained from the pyrolyzed dry materials.…”

Section: Materials Moisture Ash Content and Biochar Yieldmentioning

confidence: 99%

The Influence of Biowaste Type on the Physicochemical and Sorptive Characteristics of Corresponding Biochar Used as Sustainable Sorbent

Mourgkogiannis,

Nikolopoulos,

Kordouli

et al. 2024

Sustainability

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Biowaste raw materials were used for biochar preparation through pyrolysis at 850 °C under a limited oxygen atmosphere. Raw materials and the corresponding biochar samples were characterized by XRD, FTIR, SEM, TGA, N2-sorption, pH-equilibrium, and ash content measurements. These samples were evaluated as sustainable sorbents for use in methylene blue (MB) removal from artificial fresh water. All biochar samples exhibited high specific surface areas (367–870 m2·g−1), low crystallinity, and low population of functional groups (C–O–C, –COOH, –N–O, –N–H, and –OH) on their surfaces. They were mainly micro-porous materials with a significant fraction of pores in the meso-porous range. The specific surface area of the latter pores proved very important for the physical adsorption of MB from aqueous solution. Although the raw materials exhibited low MB sorption capacity, ranging from 29 to 54 mg·g−1, the corresponding biochar samples exhibited important MB sorption efficiency ranging from 58 to 370 mg·g−1. Among the biochar samples studied, those produced from coffee residues proved most promising for MB removal from water solution (sorption capacity: 280–370 mg·g−1), addressing the United Nations Sustainability Development Goal (SDG) 6: Clean Water and Sanitation by improving the index related to anthropogenic wastewater that has received treatment.

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Brewer’s spent grain-based biochar as a renewable energy source and agriculture substrate

Zabaleta,

Torres,

Sánchez

et al. 2024

J Mater Cycles Waste Manag

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Optimization of biochar quality and yield from tropical timber industry wastes

Cited by 15 publications

References 25 publications

Feedstock-Induced Changes in the Physicochemical Characteristics of Biochars Produced from Different Types of Pecan Wastes

Feedstock-Induced Changes in the Physicochemical Characteristics of Biochars Produced from Different Types of Pecan Wastes

The Influence of Biowaste Type on the Physicochemical and Sorptive Characteristics of Corresponding Biochar Used as Sustainable Sorbent

Brewer’s spent grain-based biochar as a renewable energy source and agriculture substrate

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