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Shubiao Wu

Effect of precolonized fungi carrier on lignin degradation of corn straw under unsterilized condition

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  • Jianbin Guo, China Agricultural University
  • ,
  • Yalin Guo, China Agricultural University
  • ,
  • Qian Zhao, China Agricultural University
  • ,
  • Shubiao Wu
  • Renjie Dong, China Agricultural University

Delignification is crucial in the energy utilization process of lignocellulose materials. In this study, efficiency of biological pretreatment of corn straw using different carriers of pre-colonized fungis, including Trametes versicolor, Trichoderma chromospermum, Trichoderma atroviride and combined fungi (T. versicolor + T. chromospermum, T. versicolor + T. atroviride) was investigated under unsterilized condition. Results showed that nearly negligible lignin degraded in the process of direct fungal pretreatment of unsterilized corn straw within 30 d. It seems that inoculum of fungi cannot compete to the indigenous microorganisms of unsterilized corn straw, resulting in low lignin degradation rate. However, the degradation rates of 34.0%, 38.1%, 38.1%, 39.1% and 40.3% lignin in the sterilized corn straw were observed after 30 d of cultivation by T. versicolor, T. chromospermum, T. atroviride, T. versicolor + T. chromospermum and T. versicolor + T. atroviride, respectively. To decrease the cost of sterilization, corn straw was pretreated by T. versicolor + T. atroviride and T. versicolor + T. atroviride with 1:9, 1:4 and 1:1 of the ratio of pre-colonized carrier and substrate for 30 d. During T. versicolor + T. chromospermum and T. versicolor + T. atroviride, pretreatment with an inoculum/substrate ratio of 1:9, 1:4 and 1:1, the degradation rate of lignin were 30% ~ 40%. Therefore, pre-colonized carrier inoculum is an effective pretreatment method to decrease cost due to pre-colonized carrier can adjust the unsterilized condition and degrade lignin effectively.

TidsskriftNongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Sider (fra-til)197-202
Antal sider6
StatusUdgivet - 25 maj 2016
Eksternt udgivetJa

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