The 6th International Conference on Biomass Energy (ICBE2018)

459 / 2018-09-05 10:04:33

Revealing the impact mechanisms of adsorption-type soil ash on lignocellulose autohydrolysis: a modeling study

Plenary track > C. Liquid Biofuel

A significant amount of adsorption-type soil ash restricts the efficiency of lignocellulose autohydrolysis due to the formations of buffering system in the liquid. Taking high adsorption-type soil ash content waste wheat straw (WWS) as an example, 500 (v/w) times water washing of WWS could effectively remove adsorption-type soil ash which lead the destruction of buffering system in autohydrolysis. In this work, the organic matters contents and inorganic matters composition of adsorption-type soil ash were determined by ignition loss, X-ray diffraction (XRD) and X-ray fluorescence (XRF) method, respectively. The original adsorption-type soil ashes were divided into three major components including organic matters, available salts and insoluble minerals. The acid buffering capacity and cation exchange capacities of these components were determined and the effects of these component on relative low ash content biomass (wheat straw) autohydorlysis were also evaluated, separately. To further investigation, modeling compounds (sodium phosphate, sodium humate and montmorillonite) were introduced to WS autohydrolysis. The results showed that with the increasing concentrations (0-30 g/L) of sodium phosphate, sodium humate and montmorillonite, the 72 h enzymatic efficiencies of pretreated residues were decreased from 74.2% to 47.6%, 40.1% and 69.7%, respectively. Overall, this work provided fundamental information about the impact mechanisms of adsorption-type soil ash on lignocellulose autohydrolysis.