Hydrolytic pre-treatment methods for enhanced biobutanol production from agro-industrial wastes. (February 2018)

• Record Type: Journal Article
• Authors: Maiti, Sampa; Gallastegui, Gorka; Suresh, Gayatri; Sarma, Saurabh Jyoti; Brar, Satinder Kaur; Drogui, Patrick; LeBihan, Yann; Buelna, Gerardo; Verma, Mausam; Soccol, Carlos Ricardo
• Is Part Of: Bioresource technology. Volume 249(2018)
• Page Start: 673
• Page End: 683
• Publication Date: 2018-02
• Subjects: Agro-industrial wastes -- Pre-treatment -- Microbial inhibitors -- Central composite design -- Kinetic modelling -- ABE fermentation; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.09.132
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Study of waste pre-treatments to enhance reducing sugars and reduce inhibitors. Total reducing sugar yield of 0.433 g/g BLW with acid-catalysed hydrolysis. Parameter optimization by RSM to enhance sugar and minimize inhibitors from BLW. Development of kinetic modelling to enhance reducing sugar for scale-up. Production of 10.2 g/L ABE by clostridial fermentation of substrate. Abstract: Brewery industry liquid waste (BLW), brewery spent grain (BSG), apple pomace solid wastes (APS), apple pomace ultrafiltration sludge (APUS) and starch industry wastewater (SIW) have been considered as substrates to produce biobutanol. Efficiency of hydrolysis techniques tested to produce fermentable sugars depended on nature of agro-industrial wastes and process conditions. Acid-catalysed hydrolysis of BLW and BSG gave a total reducing sugar yield of 0.433 g/g and 0.468 g/g respectively. Reducing sugar yield from microwave assisted hydrothermal method was 0.404 g/g from APS and 0.631 g/g from APUS, and, 0.359 g/g from microwave assisted acid-catalysed SIW dry mass. Parameter optimization (time, pH and substrate concentration) for acid-catalysed BLW hydrolysate utilization using central composite model technique produced 307.9 g/kg glucose with generation of inhibitors (5-hydroxymethyl furfural (20 g/kg), furfural (1.6 g/kg), levulinic acid (9.3 g/kg) and total phenolic compound (0.567 g/kg)). 10.62 g/L of acetone-butanol-ethanol was produced by subsequent clostridial fermentation of the substrate.