Abstract
The current research was postured for optimizing the pretreatment of wheat straw with three different chemicals i.e., 1% NaOH at 121°C for 1 hour, 4% lime at 80°C for 40 minutes, similarly 4% acetic acid at 121°C for 1 hour and studying their effect on lingo cellulosic structure of wheat straw. It was observed that NaOH treatment was most suitable maximum degradation of lignin and least disruption of cellulosic contents. NaOH pretreatment was optimized for three main process parameters i.e., temperature, pretreatment time and chemical concentration. It was analyzed that at same concentration by varying treatment time and temperature, hemicelluloses and lignin contents decreased with the increase of both parameters. Concentration of chemical was optimized at boiling temperature of 105°C for 10 minutes, revealed that with the increase in NaOH concentration lignin and hemicelluloses contents degrade more. Time parameter was optimized applying treatment of 2, 5 and 8 days. Lignin degradation was highest at 8% NaOH concentration for 2 days. Lignin contents increased abruptly at 8% NaOH and 8 days of treatment. Optimum conditions obtained for cellulose and hemicellulose are 2% NaOH, 105°C for 10 minutes.
Highlights
Lignocellulosic biomass is one of the most suitable recourse for biogas production because it is and abundantly available and inexpensive
After pre-treatment of wheat straw with 1% NaOH at 121°C for 60 minutes, cellulose contents in wheat straw were increased from 40.3% to 57.4% and hemicelluloses contents decreased from 21.1% to 14.4% like hemicelluloses, reduction was seen in the lignin contents i.e., from 20.33% to 11.7%
Aim of the pre-treatment was to increase sample porosity and cellulose contents, breaking the lignin at the same time partial degradation of hemicelluloses which is beneficial for the enzymatic hydrolysis of wheat straw
Summary
Lignocellulosic biomass is one of the most suitable recourse for biogas production because it is and abundantly available and inexpensive. Lignocellulosic material has wide range of uses i.e., cellulose received from lignocelluloses is used in textile industry for fiber making and widely used in fulfilling world’s increasing energy demands. Hemicellulose another main constituent is used in pharmacy and edible items. It is estimated that out of total cultured land in the world, one sixth portion of the land is cultivated for wheat. It grows and expeditiously in coarse land (Haque et al, 2012). Remain of wheat crop after removal of chaff and grain is a dry stalk named as wheat straw
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