The Effect of Preparing Temperature and Atmosphere on Biochar’s Quality for Soil Improving
- 163 Downloads
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.
KeywordsBiochar Pyrolysis temperature Pyrolysis atmosphere Nitrogen speciation
This study was supported by the National Natural Science Foundation of China (No.41571283) and National Key Research and Development Program of China (2016YFD0800702).
- 1.Amonette, J.E., Joseph, S.: Characteristics of biochar: microchemical properties. J. Party Sch. Shengli Oilfield. 7, 1649–1654 (2013)Google Scholar
- 3.Bai, J.S.: (2012) Study on characteristics of migration and transformation of nitrogen and sulfur during the process of biomass combustion (PhD thesis). Zhejiang University, HangzhouGoogle Scholar
- 8.Qian, T.T.: (2014) Migration transformation and reuse of phosphorus during the thermal treatment process of solid waste (PhD thesis). University of Science and Technology of China, HefeiGoogle Scholar