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Waste and Biomass Valorization

, Volume 10, Issue 5, pp 1395–1405 | Cite as

The Effect of Preparing Temperature and Atmosphere on Biochar’s Quality for Soil Improving

  • Zhongxin TanEmail author
  • Shengnan Yuan
Original Paper

Abstract

To investigate how to influence the biochar quality for improving soil by the preparing temperature and atmosphere, biochar samples were produced from rice straw at different temperatures (300, 400, 600 and 800 °C) and different pyrolysis atmospheres (N2 and CO2). Other researchers all did not use CO2 to produce the biochar for improving the chemical and physical properties of soil. Through these research works, some important results were found: (1) Comparing with returning rice straw, biochar have much better effect of returning it to soil such as good pore structure and distributions, organic nutrients of rice straw (e.g. protein–N) transferred into inorganic nutrient (NH4–N, NO2–N and NO3–N) and so on; (2) The biochar cannot be formed in the too low pyrolysis temperature such as the solid materials of 300 °C are not biochar which do not form carbon frame structure; (3) With the heating temperature rising, the nutrient nitrogen loss of biochar is more and more bigger; (4) CO2 is much better than N2 because biochar of CO2 has much better pore structure, keeps much more nutrients and produces much better nutrient speciation for improving soil fertility. Therefore, the optimized work conditions of the best biochar are 400 °C and CO2 atmosphere.

Keywords

Biochar Pyrolysis temperature Pyrolysis atmosphere Nitrogen speciation 

Notes

Acknowledgements

This study was supported by the National Natural Science Foundation of China (No.41571283) and National Key Research and Development Program of China (2016YFD0800702).

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© Springer Science+Business Media B.V., part of Springer Nature 2017

Authors and Affiliations

  1. 1.College of Resources and EnvironmentHuazhong Agricultural UniversityWuhanPeople’s Republic of China

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