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

doi:10.1016/j.cjche.2015.11.005

Abstract

Abstract: Wheat strawbiodegradability during anaerobic digestionwas improved by treatment with potassiumhydroxide(KOH) to decrease digestion time and enhance biomethane production and fertility value.KOH concentrations of 1%(K1), 3%(K2), 6%(K3) and 9%(K4) were tested for wheat straw pretreatment at ambient temperaturewith a C:N ratio of 25:1.86% of total solids(TS), 89% of volatile solids(VS) and 22% of lignocellulose, cellulose and hemicellulose(LCH)(22%) were decomposed effectively with the wheat straw pretreated by 6% KOH.Enhanced biogas 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(138%), 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.

Key words: Biomethane, Fertilizer value, Wheat straw, Anaerobic digestion, KOH pretreatment

Muhammad Jaffar, Yunzhi Pang, Hairong Yuan, Dexun Zou, Yanping Liu, Baoning Zhu, Rashid Mustafa Korai, Xiujin Li. Wheat straw pretreatment with KOH for enhancing biomethane production and fertilizer value in anaerobic digestion[J]. Chin.J.Chem.Eng., 2016, 24(3): 404-409.

Muhammad Jaffar, Yunzhi Pang, Hairong Yuan, Dexun Zou, Yanping Liu, Baoning Zhu, Rashid Mustafa Korai, Xiujin Li. [J]. Chinese Journal of Chemical Engineering, 2016, 24(3): 404-409.

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