Applied Biochemistry and Biotechnology

, Volume 105, Issue 1–3, pp 205–218 | Cite as

Post-harvest processing methods for reduction of silica and alkali metals in wheat straw

  • David N. Thompson
  • Peter G. Shaw
  • Jeffrey A. Lacey


Silica and alkali metals in wheat straw limit its use for bioenergy and gasification. Slag deposits occur via the eutectic melting of SiO2 with K2O, trapping chlorides at surfaces and causing corrosion. A minimum melting point of 950°C is desirable, corresponding to an SiO2:K2O weight ratio of about 3:1. Mild chemical treatments were used to reduce Si, K, and Cl, while varying temperature, concentration, % solids, and time. Dilute acid was more effective at removing K and Cl, while dilute alkali was more effective for Si. Reduction of minerals in this manner may prove economical for increasing utilization of the straw for combustion or gasification.

Index Entries

Bioenergy combustion gasification fluidized bed silica potassium chloride slagging 


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Copyright information

© Humana Press Inc. 2003

Authors and Affiliations

  • David N. Thompson
    • 1
  • Peter G. Shaw
    • 1
  • Jeffrey A. Lacey
    • 1
  1. 1.Biotechnology DepartmentIdaho National Engineering and Environmental LaboratoryIdaho Falls

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