For alkali treatment was sodium hydroxide solution at concentration of 1-5% used. Subcritical water treatment carried out at 160°C (5 bar) and 200°C (15 bar) for 10 min. Ultrasound was applied as combination method after acid pretreatment
For alkali treatment was sodium hydroxide solution at concentration of 1-5% used. Subcritical watertreatment carried out at 160°C (5 bar) and 200°C (15 bar) for 10 min. Ultrasound was applied ascombination method after acid pretreatment