PJB-2017-538
OPTIMIZATION OF DILUTE SULPHURIC ACID PRETREATMENT OF SAW DUST USING RESPONSE SURFACE METHODOLOGY
AASIYA ANJUM
Abstract
Kikar tree (Acacia arabica) owing to its hardwood is broadly used in furniture industry for making value added products. Processing of kikar tree for obtaining lumber generates enormous saw dust i.e. the residue of wood. It is rich in cellulose that�s why, it can be employed for bioethanol production. However, complex structure of lignocelluoses hinders its efficient utilization and necessitates the pretreatment step for releasing sugars from lignocellulosic material. The objective of this study was to find optimum conditions in acid hydrolysis that can maximize the production of celluloses from saw dust. For optimization, response surface methodology (RSM) with Box-Bhenken Design (BBD) was applied for examining the effect of acid concentration, substrate concentration and time on total sugar and total phenol released. In acid pretreatment, 19.542mg/ml phenol was released at optimum conditions i.e. 0.6% acid concentration, 10g substrate concentration and 4h time. At these optimum conditions, 4.80mg/ml total sugar was released. In acid steam pretreatment, 39.37mg/ml total phenol and 135.68mg/ml total sugar was released at optimum conditions i.e. 0.6% acid concentration, 15g substrate concentration and reaction time of 6h. Chemical compositions and structural changes of saw dust after pretreatment was analyzed through Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction analysis (XRD).
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