G. Gascó , J. Paz-Ferreiro , M.L. Álvarez , A. Saa , A. Méndez
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引用次数: 158
摘要
有机废物热解制备生物炭已被证明是一种有效的废物管理方法。然而,一些有机废物的高含水量使其在热解处理前没有干燥步骤就无法使用。因此,湿生物质的水热碳化(HTC)可能是一种廉价的替代管理方法。本研究的主要目的是比较从猪粪热处理得到的生物炭和水炭的性质。在300 °C (BPM300)、450 °C (BPM450)和600 °C (BPM600)的温度下制备生物炭,用猪粪溶液(比例为30:70)在200 °C (HPM200)、220 °C (HPM220)和240 °C (HPM240)加热2 h得到氢炭。生物炭和碳氢化合物样品的表征表明,热解生成的炭具有更多的芳香族结构和较高的热稳定性,而HTC生成的炭具有更多的脂肪族结构。HPM220和HPM240在200 ~ 30,000 nm范围内的宏观孔隙发育可能与较高的O/C比和较高的O/C比有关。这些结果表明,HTC可能是一种有趣的方法来获得土壤生长介质或绿色屋顶材料具有足够的水物理性质。
Biochars and hydrochars prepared by pyrolysis and hydrothermal carbonisation of pig manure
Pyrolysis of organic wastes for biochar preparation has been proved as a useful way of waste management. However, the elevated water content of some organic wastes precludes its use without a drying step before pyrolysis treatment. For this reason, hydrothermal carbonization (HTC) of wet biomass could be an inexpensive alternative management method. The main objective of the present work is to compare the properties of biochars and hydrochars obtained from thermal treatment of pig manure. Biochars were prepared at 300 °C (BPM300), 450 °C (BPM450) and 600 °C (BPM600) and hydrochars were obtained using a pig manure solution (ratio 30:70) that was heated at 200 °C (HPM200), 220 °C (HPM220) and 240 °C (HPM240) during 2 h. Characterization of biochar and hydrochar samples showed that pyrolysis led to chars with more aromatic structures and high thermal stability while HTC process originated chars with more aliphatic structures. HPM220 and HPM240 showed the highest values of field capacity water content and available water probably due to their higher O/C ratios and the macroporosity development in the range from 200 to 30,000 nm. These results suggested that HTC could be an interesting method to obtain soil growing media or green roof materials with adequate hydrophysical properties.
期刊介绍:
Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes.
Scope:
Addresses solid wastes in both industrialized and economically developing countries
Covers various types of solid wastes, including:
Municipal (e.g., residential, institutional, commercial, light industrial)
Agricultural
Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)