A Study on Recycling of Spent Mushroom Substrate to Prepare Chars and Activated Carbon

作者：Ma, Yuhui; Wang, Qunhui^*; Sun, Xiaohong; Wang, Xiaoqiang; Su, Wei; Song, Na

来源：BioResources, 2014, 9(3): 3939-3954.

DOI：10.15376/biores.9.3.3939-3954

• Spent mushroom substrate
• Pyrolysis
• Char
• Activated carbon
• Thermogravimetric analysis
• Kinetics

Chars were obtained from spent mushroom substrate (SMS) via pyrolysis. It was found that as the pyrolysis temperature increased from 400 to 700 degrees C, the char yield decreased from 45.10 to 33.79 wt.% and the higher heating value increased from 17.32 to 22.72 MJ/kg. The largest BET surface area (13 m(2)/g) was created at 500 degrees C. Hydrogen atoms were continuously lost during pyrolysis, whereas oxygen atoms were difficult to eliminate. Whewellite, calcite, lime, and quartz were the minerals in the chars, and their forms and crystallinity changed with changing pyrolysis temperature. Activated carbon with a BET surface area of 1023 m(2)/g and a total pore volume of 0.595 cm(3)/g was obtained from the char prepared at 500 degrees C. Its characteristics were studied by N-2-adsorption, Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The pyrolysis and KOH-activation processes were investigated by thermogravimetric analysis (TGA). The results showed that the pyrolysis of SMS occurred primarily between 217 and 375 degrees C and that the energies needed for the pyrolysis reactions were relatively low due to the prior mushroom cultivation. Furthermore, lignin was incompletely decomposed in the char prepared at 500 degrees C, and KOH suppressed tar evolution and reduced the energy needed to decompose the residual lignin during activation.

• 出版日期2014
• 单位华北电力大学（保定）; 华北电力大学; 北京科技大学; 北京市农林科学院