BioChem - DOS

Single and two-stage anaerobic digestion for hydrogen and methane production from acid and enzymatic hydrolysates of Agave tequilana bagasse

International journal of hydrogen energy

Arreola-Vargas, Jorge; Flores-Larios, Andres; Gonzá lez-Á lvarez, Ví ctor; Corona-Gonzá lez, Rosa Isela; Mé ndez-Acosta, Hugo Oscar

<P><B>Abstract</B></P> <P>A comparison study on the energy recovery from single and two-stage anaerobic digestion of <I>Agave tequilana</I> bagasse hydrolysates is presented in this contribution. Firstly, the <I>A. tequilana</I> bagasse was acid or enzymatically hydrolyzed and then both hydrolysates were digested at different concentrations (20&ndash;100% v/v) in batch reactors. Results showed that the two-stage anaerobic digestion outperformed the single-stage process. During the acidogenesis phase of the two-stage process, high hydrogen yields were reached with the enzymatic hydrolysate at a concentration of 40% (3.4 mol H<SUB>2</SUB>/mol hexose); whilst during methanogenic phase, the highest methane yield was obtained at a concentration of 20% for both hydrolysates (0.24 L CH<SUB>4</SUB>/g COD). The overall energy recovery analysis demonstrated that the two-stage process outperformed 3.3 times the single-stage process when comparing the highest energy recoveries obtained in each process. This is the first study that reveals such enhancement for the anaerobic digestion of lignocellulosic hydrolysates.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The potential of H<SUB>2</SUB>/CH<SUB>4</SUB> production from acid and enzymatic hydrolysates was studied. </LI> <LI> Single and two-stage AD were evaluated by using both hydrolysates. </LI> <LI> Higher H<SUB>2</SUB> and CH<SUB>4</SUB> yields were achieved by the two-stage AD for both hydrolysates. </LI> <LI> Highest energy recovery was obtained with the enzymatic hydrolysate in two-stage AD. </LI> <LI> The two-stage AD outperformed 3.3 times the single-stage process on energy recovery. </LI> </UL> </P>

2016

Elsevier

0360-3199

1879-3487

41

2

pp.897-904

10.1016/j.ijhydene.2015.11.016

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART74781737

Acid-enzymatic hydrolysates; Agave tequilana Weber var. Azul; Anaerobic digestion; Lignocellulosic biomass; Two-stage process