초록
<P><B>Abstract</B></P> <P>NaOH pretreatment with leachate reuse and Ca(OH)<SUB>2</SUB> pretreatment were compared for improved enzymatic digestibility and biogas production from giant reed, a promising energy crop. The NaOH pretreatment with leachate reuse increased glucose yields during enzymatic hydrolysis by 2.6-fold, and methane yields during anaerobic digestion by 1.4- to 1.6-fold. However, NaOH pretreatment had a negative net benefit (i.e., revenue from increased energy production minus chemical cost). Pretreatment with 7–20% Ca(OH)<SUB>2</SUB> not only improved glucose yield and methane yield by up to 2.3-fold and 1.4-fold, respectively, but also obtained a net benefit of $1.1–5.8/tonne dry biomass. Thus, Ca(OH)<SUB>2</SUB> pretreatment was shown to be more feasible than NaOH pretreatment for biogas production from giant reed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sodium hydroxide and calcium hydroxide pretreatments of giant reed were compared. </LI> <LI> Revenue from sodium hydroxide (NaOH) pretreatment can’t offset the chemical input. </LI> <LI> Calcium hydroxide (Ca(OH)<SUB>2</SUB>) pretreatment improved glucose yield and methane yield. </LI> <LI> Pretreatment with 7% Ca(OH)<SUB>2</SUB> had a positive net benefit of $5.8/tonne dry biomass. </LI> <LI> Ca(OH)<SUB>2</SUB> is more feasible than NaOH for improving biogas production from giant reed. </LI> </UL> </P>