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    Leaching characteristics of inherent inorganic nutrients in biochars from the slow and fast pyrolysis of mallee biomass

    Access Status
    Fulltext not available
    Authors
    Kong, Zhao Ying
    Liaw, Sui Boon
    Gao, Xiangpeng
    Yu, Yun
    Wu, Hongwei
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Kong, Z.Y. and Liaw, S.B. and Gao, X. and Yu, Y. and Wu, H. 2014. Leaching characteristics of inherent inorganic nutrients in biochars from the slow and fast pyrolysis of mallee biomass. Fuel. 128: pp. 433-441.
    Source Title
    Fuel
    DOI
    10.1016/j.fuel.2014.03.025
    ISSN
    0016-2361
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/3334
    Collection
    • Curtin Research Publications
    Abstract

    This study compares the inherent leaching characteristics of inorganic nutrients, particularly alkali and alkaline earth metallic (AAEM, mainly Na, K, Mg, and Ca) species in biochars prepared from the slow and fast pyrolysis of mallee biomass particles at 500 C. The results indicate that, compared to slow pyrolysis, fast pyrolysis produces biochars with less water-soluble AAEM species but more plant available AAEM nutrient species (through Mehlich I extraction). Pyrolysis of different biomass components results in biochars with different water-soluble and plant available AAEM nutrient species, depending on pyrolysis conditions. Biochars produced from pyrolysis of large wood particle (2–4 mm) exhibit slower water leaching kinetics and a lower plant available nutrients than those from fine wood particles (150–250 lm). Slow pyrolysis results in a reduction in water-soluble Na and K in biochars while an increment was observed for biochars produced from the fast pyrolysis of large wood. Experimental kinetic data can be broadly fitted to a pseudo-second order model. For all biochars, a significant proportion of inorganic nutrients can be recycled, demonstrating the potential of returning biochar to soil for completing the loop of nutrient recycling and enhancing the sustainability of biomass utilisation cycle.

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