Orange wastes, including peel and pulp, were used as a biorefinery feedstock to produce pectin, ethanol, biogas. The orange wastes subjected dilute acid treatment with sulfuric (1% w/v) at 94, 100, 140, 180 °C for 60, 30, 0 min. was performed pectin extraction, sugars hydrolysis, lignocellulose pretreatment. extracted from the hydrolysate, liquor pretreated solid anaerobically digested highest ...