SCI和EI收录∣中国化工学会会刊

›› 2017, Vol. 25 ›› Issue (4): 477-486.DOI: 10.1016/j.cjche.2016.09.009

• Biotechnology and Bioengineering • Previous Articles     Next Articles

Transformation mechanism of nutrient elements in the process of biochar preparation for returning biochar to soil

Shuangshuang Tian1, Zhongxin Tan1, Alfreda Kasiuliene.2, Ping Ai3   

  1. 1 College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;
    2 Waste Science and Technology, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-97187 Luleå, Sweden;
    3 College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
  • Received:2016-06-28 Revised:2016-09-08 Online:2017-06-03 Published:2017-04-28

Transformation mechanism of nutrient elements in the process of biochar preparation for returning biochar to soil

Shuangshuang Tian1, Zhongxin Tan1, Alfreda Kasiuliene.2, Ping Ai3   

  1. 1 College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;
    2 Waste Science and Technology, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, SE-97187 Luleå, Sweden;
    3 College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
  • 通讯作者: Zhongxin Tan

Abstract: 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℃ 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.

Key words: Agricultural waste, Rice straw, Biochar, Nutrient transformation, pH transformation

摘要: 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℃ 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.

关键词: Agricultural waste, Rice straw, Biochar, Nutrient transformation, pH transformation