Wheat straw pretreatment with KOH for enhancing biomethane production and fertilizer value in anaerobic digestion

• Published in: Chinese journal of chemical engineering 2016-03, Vol.24 (3), p.404-409
• Main Authors: Jaffar, Muhammad, Pang, Yunzhi, Yuan, Hairong, Zou, Dexun, Liu, Yanping, Zhu, Baoning, Korai, Rashid Mustafa, Li, Xiujin
• Format: Article
• Language: English
• Subjects: Anaerobic digestion; Biomethane; Fertilizer value; KOH; KOH pretreatment; Wheat straw; 价值; 厌氧消化过程; 小麦秸秆; 生产; 秸秆预处理; 肥料; 高沼气
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/j.cjche.2015.11.005

Wheat straw biodegradability during anaerobic digestion was improved by treatment with potassium hydroxide （KOH） to decrease digestion time and enhance biomethane production and fertility value. KOH concentrations of 1% （KI）, 3% （[（2）, 6% （K3） and 9% （l（4） were tested for wheat straw pretreatment at ambient temperature with a C：N ratio of 25：1.86% of total solids （TS）, 89% of volatile solids （VS） and 22% of lignocellulose, cellulose and hemi- cellulose （LCH） （22%） were decomposed effectively with the wheat straw pretreated by 6% KOH. Enhanced bio- gas production and cumulative biomethane yield of 258 ml. （g VS）-1 were obtained increased by 45% and 41% respectively, compared with untreated wheat straw. Pretreated wheat straw digestion also yielded a digestate with higher fertilizer values potassium （l 38%）, calcium （22%） and magnesium （16%）. These results show that TS, VS and LCH can be effectively removed from wheat straw pretreated with KOH, improving biodegradability biomethane production and fertilizer value.