Power consumption evaluation of different fed-batch strategies for enzymatic hydrolysis of sugarcane bagasse

Author(s)

Correa, Luciano Jacob ^[1] ; Badino, Alberto Colli ^{[2, 1]} ; Goncalves Cruz, Antonio Jose ^{[2, 1]}

Affiliation

^[1] Univ Fed Sao Carlos, Chem Engn Grad Program, PPGEQ UFSCar, Sao Paulo - Brazil

^[2] Univ Fed Sao Carlos, Dept Chem Engn, BR-13560 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Bioprocess and Biosystems Engineering; v. 39, n. 5, p. 825-833, MAY 2016.
• Web of Science Citations: 12

Abstract

The minimization of costs in the distillation step of lignocellulosic ethanol production requires the use of a high solids loading during the enzymatic hydrolysis to obtain a more concentrated glucose liquor. However, this increase in biomass can lead to problems including increased mass and heat transfer resistance, decreased cellulose conversion, and increased apparent viscosity with the associated increase in power consumption. The use of fed-batch operation offers a promising way to circumvent these problems. In this study, one batch and four fed-batch strategies for solids and/or enzyme feeding during the enzymatic hydrolysis of sugarcane bagasse were evaluated. Determinations of glucose concentration, power consumption, and apparent viscosity were made throughout the experiments, and the different strategies were compared in terms of energy efficiency (mass of glucose produced according to the energy consumed). The best energy efficiency was obtained for the strategy in which substrate and enzyme were added simultaneously (0.35 kg(glucose) kWh(-1)). This value was 52 % higher than obtained in batch operation. (AU)

• FAPESP's process: 11/23807-1 - Development and evaluation of the operational conditions of bioreactors for production of biotechnological products
• Grantee: Alberto Colli Badino Junior
• Support Opportunities: Regular Research Grants