Enzymatic hydrolysis and ethanol yields of combined surfactant and dilute ammonia treated sugarcane bagasse

► Pretreatment with combined surfactant and ammonia was effective. ► Tween 80-ammonia pretreatment was the most effective. ► Surfactant-ammonia pretreatment altered cellulose crystallinity. ► Significant lignin removal was observed. ► Significant sugar and ethanol yields were observed.