Process intensification strategies for enhanced holocellulose solubilization: Beneficiation of pineapple peel waste for cleaner butanol production

Abstract

Biorefinery sector has become a serious dispute for cleaner and sustainable development in recent years. In the present study, pretreatment of pineapple peel waste was carried out in high pressure reactor using various pretreatment-enhancers. The type and concentration effect of each enhancer on hemicellulose solubilization was systematically investigated. The binary acid (phenol + sulfuric acid) at 180 °C was found to be superior amongst other studied enhancers, giving 81.17% (w/v) hemicellulose solubilization in liquid-fraction under optimized conditions. Solid residue thus obtained was subjected to enzymatic hydrolysis that resulted into 24.50% (w/v) cellulose breakdown. Treated solid residue was further characterized by scanning electron microscopy and Fourier transform infrared spectroscopy to elucidate structural changes. The pooled fractions (acid treated and enzymatically hydrolyzed) were fermented using Clostridium acetobutylicum NRRL B 527 which resulted in butanol production of 5.18 g/L with yield of 0.13 g butanol/g sugar consumed. Therefore, pretreatment of pineapple peel waste evaluated in this study can be considered as milestone in utilization of low cost feedstock, for bioenergy production.

Recent Updates on the Conversion of Pineapple Waste (Ananas comosus) to Value-Added Products, Future Perspectives and Challenges

“…According to the authors, 97 g/L of sugar were released during the detoxification process with a maximum of 5.23 g/L of ABE titred after the procedure. A different study applied phenol and sulfuric acid pre-treatment at 180 • C and achieved 357.25 g/L of fermentable sugar [167]. In this study, fermentation by Clostridium acetobutylicum NRRL B-527 produced 5.18 g/L of biobutanol.…”

Effect of Chemical-Hydrothermal Pretreatments on Compositional and Morphological Changes of Spruce Wood Exploited in Biogas Systems

“…content for SH and PA + Ph treatments(Khedkar et al 2018;Pal et al 2016). According to the previous study by Li et al (2016) on M. lutarioriparius samples, steam explosion increased peak intensity at 897 cm − 1 and also they suggested the augmentation of cellulose content after pretreatment.…”

“…The ratio of 1427/897 was used to estimate LOI (correspond to a CH 2 bending vibrations) (Khedkar et al 2018) which is related to the amount of the crystalline structure of cellulose (Nelson and O'Connor 1964). and 1320 cm − 1 (CH rocking vibration of the glucose ring).…”

“…Generally, increased CLL, LOI and HBI values represent the highest degree of crystallinity and a more ordered cellulose structure. While decreasing these values designate the amorphous structure of cellulose (Khedkar et al 2018). Table 3 summarizes the values of different crystallinity ratios (CLL, LOI and HBI).…”

Strategic intensification in butanol production by exogenous amino acid supplementation: Fermentation kinetics and thermodynamic studies

“…Butanol, being a potential renewable liquid biofuel is established globally, due to its excellent fuel properties (Maiti et al, 2016). However, its commercial usage as a fuel is still obstructed because of several technoeconomic concerns (Khedkar et al, 2018). Conventionally, biobutanol is produced via anaerobic conversion of carbohydrates into acetonebutanol-ethanol (ABE) using Clostridial strains (Ibrahim et al, 2017).…”