Pretreatment methods of lignocellulosic biomass for anaerobic digestion

Amin, Farrukh Raza; Khalid, Habiba; Zhang, Han; Rahman, Sajid u; Zhang, Ruihong; Liu, Guangqing; Chen, Chang

doi:10.1186/s13568-017-0375-4

AMB Express

Table 1 Different pretreatment methods and their methane yields

From: Pretreatment methods of lignocellulosic biomass for anaerobic digestion

Pretreatment method	Pretreatment type	Pretreatment conditions	Composition changed	Gas generating capacity mL/g_VS	Increased methane yield (%)	Observations	Reference
Physical methods	Mechanical pulverization	Pulverization, particle sizes of 33 to 6 mm	Cellulose, hemicellulose	–	11–13	Energy cost is high; particle diameter should be 6 mm for high methane yield	(Herrmann et al. 2012)
Physicochemical methods	Steam explosion	Pretreating silage straw 2.5 MPa, 90 s	Hemicellulose, lignin	334.8	56	Gas generating speed increased	(Guizhuan et al. 2012)
Physicochemical methods	Microwave radiation	Frequency 2.45 GHz, power 680 W, time 24 min	Lignin	332.3	–	Gas generating speed is fast	(Weiwei et al. 2012)
Chemical methods	H₂SO₄	2%, pretreated 7 days	Cellulose, hemicellulose	175.6 CH₄	74.6	Toxic, corrosive and expensive handling	(Song et al. 2014)
	HCl	2%, pretreated 7 days	Cellulose, hemicellulose	163.4 CH₄	62.4	Toxic, corrosive and expensive handling	(Song et al. 2014)
	CH₃COOH	4%, pretreated 7 days	Cellulose, hemicellulose	145.1 CH₄	44.2	Toxic, corrosive and expensive handling	(Song et al. 2014)
	NaOH	2%, pretreated 3 days	Hemicellulose, lignin	220.0 CH₄	73.4	Toxic and hard to recycle	(Zheng et al. 2009)
	KOH	2.5%, pretreated 1 day	Hemicellulose, lignin	295.0 CH₄	95.6	Effective but expensive	(Li et al. 2015b)
	Ca(OH)₂	2.5%, pretreated 1 day	Hemicellulose, lignin	210.71 CH₄	39.7	Cheap but hard to dissolve	(Li et al. 2015b)
	KOH + Ca(OH)₂	0.5 and 2%, pretreated 1 day	Hemicellulose, lignin	271.38 CH₄	79.9	Cheap and effective	(Li et al. 2015b)
	H₂O₂	3%, pretreated 7 days	Hemicellulose, lignin	216.7 CH₄	115.4	Cheap but longer pretreatment time	(Song et al. 2014)
Biological methods	Mixed microorganism	XDC-2, pretreated for 16 days	Hemicellulose	294.9 CH₄	87. 9	Long pretreatment time and low efficiency	(Yuan et al. 2011)
	Adding manure	Cow dung: corn straw (1:1, w/w) pretreated for 20 days	Hemicellulose	450.0	40. 7	Highly dependent on manure type	(Zhou et al. 2012)
	Microaerobic pretreatment	Pretreated up to complete O₂ consumption by microbes	Hemicellulose, lignin	325.7 CH₄	16.24	Efficient pretreatment and cost effective	(Fu et al. 2015d)

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