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Characterization of mixing and yield stress of pretreated wheat straw slurries used for the production of biofuels through tomography technique
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DOI：10.1007/s00449-018-1959-3.png)
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Abstract
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Wheat straw is a low-cost feedstock for the production of biofuel. Pretreatment process is an important stage in producing biofuels since it makes the fibers more accessible to enzymatic hydrolysis which is the final step of producing biofuels. Pretreated wheat straw (PWS) slurries are non-Newtonian fluids with yield stress. Mixing of fluids exhibiting yield stress such as the pretreated wheat straw slurry results in the generation of cavern, which is a fully-mixed zone, around the impeller and the stationary regions elsewhere, which causes difficulties in the production of biofuels. In this study, the non-invasive electrical resistance tomography technique was utilized to determine the cavern dimensions as a function of the impeller type and impeller speed. The cavern sizes were then used to measure the yield stress of PWS slurries as a function of fiber size (<= 2 and <= 6 mm) and fiber concentration (6, 8, and 10 wt%).
Keywords:
Pretreated wheat straw
Biofuel
Electrical resistance tomography
Mixing
Yield stress
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