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Review
. 2016 Dec 12;17(5):489-499.
doi: 10.1002/elsc.201600102. eCollection 2017 May.

Enzymatic hydrolysis of lignocellulosic biomass from low to high solids loading

Hong-Zhang Chen  1 , Zhi-Hua Liu  1   2
Affiliations
Review

Enzymatic hydrolysis of lignocellulosic biomass from low to high solids loading

Hong-Zhang Chen et al. Eng Life Sci. .

Abstract

Solid state enzymatic hydrolysis (SSEH) has many advantages, such as higher sugar concentration, lower operating costs, and less energy input. It should be a potential approach for the industrial application of lignocellulosic ethanol. The purpose of this work is to review the enzymatic hydrolysis of lignocellulosic biomass from low to high solids loading and introduce its both challenges and perspectives. The limitations of SSEH, including inhibition effects, water constraint, and rheology characteristic, are summarized firstly. Various strategies for overcoming these limitations are proposed correspondingly. Fed batch process and its feeding strategy to improve the SSEH efficiency are then discussed. Finally, several intensification methods, hydrolysis reactor, and pilot- and demonstration-scale operations of SSEH are described. In-depth analysis of main limitations and development of novel intensification methods and reactors should provide an effective way to achieve large-scale implementation of SSEH.

Keywords: Biorefinery; Process intensification; Rheology; Solid state enzymatic hydrolysis; Water constraint.

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Figures

Figure 1
Figure 1
The advantages and limitation factors of SSEH 15, 16.
Figure 2
Figure 2
Schematic displaying water pools of LCB in multilength scale of its conversion process at high solids loading.
Figure 3
Figure 3
Nonisothermal simultaneous solid state hydrolysis, fermentation, and separation (NSSSFS) system. (A) Condensing water circulation device; (B) filter plate; (C) outer cylinder with heating jacket; (D) thermal insulation inner column; (E) ethanol fermentation zone; (F) enzymatic saccharification zone; (G) float valve; (H) CO2 circulation pump; (I) hydrolyzate circulation pump; (J) value; (K) adsorption column of activated carbon. The arrows mean the direction of gas and liquid flow 2, 67
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