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Transformation Mechanism of Nutrient Elements in the Process of Biochar Preparation for Returning Biochar to Soil
College of Resources and Environment, Huazhong Agricultural University, Wuhan .
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
College of Engineering, Huazhong Agricultural University, Wuhan 430070, China.
Number of Authors: 4
2016 (English)In: Chinese Journal of Chemical Engineering, ISSN 1004-9541, E-ISSN 2210-321XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

Returning biochar to soil is a heavily researched topic because biochar functions well for soil improvement. There is a significant loss of nutrients, which occurs during biochar preparation before biochar is returned to soil, thereby seriously undermining biochar's efficacy. Therefore, the transformation mechanisms of biochar pH, mass, nutrients and metals during pyrolysis under different atmospheres and temperatures were studied such that the best method for biochar preparation could be developed. Several conclusions can be reached: (1) a CO2 atmosphere is better than a N2 atmosphere for biochar preparation, although preparation in a CO2 atmosphere is not a common practice for biochar producers; (2) 350 °C is the best temperature for biochar preparation because the amount of nutrient loss is notably low based on the premise of straw transferred into biochar; and (3) transforming mechanisms of pH, N, P and K are also involved in the biochar preparation process.

Place, publisher, year, edition, pages
National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
URN: urn:nbn:se:ltu:diva-59792DOI: 10.1016/j.cjche.2016.09.009ScopusID: 2-s2.0-85008441594OAI: diva2:1037619
Available from: 2016-10-17 Created: 2016-10-17 Last updated: 2017-01-16

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