Pretreatment of lignocelluloses for enhanced biogas production: A review on influencing mechanisms and the importance of microbial diversity

RENEWABLE & SUSTAINABLE ENERGY REVIEWS

卷:135

Review

Mirmohamadsadeghi, Safoora¹  Karimi, Keikhosro^1,2  Azarbaijani, Reza³  Yeganeh, Laleh Parsa³  Angelidaki, Irini⁴  Nizami, Abdul-Sattar⁵  Bhat, Rajeev⁶  Dashora, Kavya⁷  Vijay, Virendra Kumar⁷  Aghbashlo, Mortaza⁸  Gupta, Vijai Kumar⁹  Tabatabaei, Meisam^10,11,12,13 

[1] Isfahan Univ Technol, Dept Chem Engn, Esfahan 8415683111, Iran

[2] Isfahan Univ Technol, Res Inst Biotechnol & Bioengn, Ind Biotechnol Grp, Esfahan 8415683111, Iran

[3] ACECR, Iranian Biol Resource Ctr, Mol Bank, Tehran, Iran

[4] Tech Univ Denmark, Dept Environm Engn, DK-2800 Lyngby, Denmark

[5] Govt Coll Univ, Sustainable Dev Study Ctr, Lahore, Pakistan

[6] Estonian Univ Life Sci, ERA Chair Food Prod Valorizat Technol, EE-51006 Tartu, Estonia

[7] Indian Inst Technol Delhi, Ctr Rural Dev & Technol, Hauz Khas, New Delhi 110016, India

[8] Univ Tehran, Fac Agr Engn & Technol, Dept Mech Engn Agr Machinery, Coll Agr & Nat Resources, Karaj, Iran

[9] Mohammed VI Polytech Univ UM6P, AgroBioSci AgBS & Chem Biochem Sci CBS Dept, Lot 660, Hay Moulay Rachid 43150, Benguerir, Morocco

[10] Univ Malaysia Terengganu, Inst Trop Aquaculture & Fisheries AKUATROP, Terengganu 21030, Malaysia

[11] Henan Agr Univ, Sch Forestry, Henan Prov Engn Res Ctr Forest Biomass Value Adde, Zhengzhou 450002, Peoples R China

[12] Agr Res Educ & Extens Org AREEO, Agr Biotechnol Res Inst Iran ABRII, Karaj, Iran

[13] Biofuel Res Team BRTeam, Terengganu, Malaysia

关键词: Anaerobic digestion;    Lignocellulosic substrate;    Pretreatment;    Influencing mechanism;    Methane;    Microbial community;   

DOI  :  10.1016/j.rser.2020.110173

来源: Elsevier

【 摘 要 】

As one of the most efficient methods for waste management and sustainable energy production, anaerobic digestion (AD) countenances difficulties in the hydrolysis of lignocelluloses biomass. Different pretreatment methods have been applied to make lignocelluloses readily biodegradable by microorganisms. These pretreatments can affect biogas yield by different mechanisms at molecular scale, including changes in chemical composition, cellulose crystallinity, degree of polymerization, enzyme adsorption/desorption, nutrient accessibility, deacetylation, and through the formation of inhibitors. The present article aims at critically reviewing the reported molecular mechanisms affecting biogas yield from lignocelluloses via different types of pretreatments. Then, a new hypothesis concerning the impact of pretreatment on the microbial community developed (throughout the AD process from an identical inoculum) was also put forth and was experimentally examined through a case study. Four different leading pretreatments, including sulfuric acid, sodium hydroxide, aqueous ammonia, and sodium carbonate, were performed on rice straw as model lignocellulosic feedstock. The results obtained revealed that the choice of pretreatment method also plays a pivotally positive or negative role on biogas yield obtained from lignocelluloses through alteration of the microbial community involved in the AD. Considerable changes were observed in the archaeal and bacterial communities developed in response to the pretreatment used. Sodium hydroxide, with the highest methane yield (338 mL/g volatile solid), led to a partial switch from acetoclastic to the hydrogenotrophic methane production pathway. The findings reported herein undermine the default hypothesis accepted by thousands of previously published papers, which is changes in substrate characteristics by pretreatments are the only mechanisms affecting biogas yield. Moreover, the results obtained could assist with the development of more efficient biogas production systems at industrial scale by offering more in-depth understanding of the interactions between microbial community structure, and process parameters and performance.

【 授权许可】

Free