Exploring the Potential of Potato Peels for Bioethanol Production through Various Pretreatment Strategies and an In-House-Produced Multi-Enzyme System

Sanjeev Kumar Soni (), Binny Sharma, Apurav Sharma, Bishakha Thakur and Raman Soni
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Sanjeev Kumar Soni: Department of Microbiology, Panjab University, Chandigarh 160014, India
Binny Sharma: Department of Microbiology, Panjab University, Chandigarh 160014, India
Apurav Sharma: Department of Microbiology, Panjab University, Chandigarh 160014, India
Bishakha Thakur: Department of Microbiology, Panjab University, Chandigarh 160014, India
Raman Soni: Department of Biotechnology, D.A.V. College, Chandigarh 160011, India

Sustainability, 2023, vol. 15, issue 11, 1-19

Abstract: This study aimed to explore the viability of converting potato peel waste into bioethanol using a custom-produced multi-enzyme preparation. Various pretreatment approaches were employed on the potato peels, including thermal, chemical, and thermo-chemical methods. These methods involved boiling for 30 and 60 min, steaming at different pressures and durations, and applying different concentrations of chemicals, including H 2 SO 4 , HNO 3 , CH 3 COOH, HCl, NaOH, Ca(OH) 2 , KOH, NH 3 , and H 2 O 2 , either individually or in combination with steam treatment. The pretreated potato peels were subsequently subjected to enzymatic hydrolysis using a crude multi-enzyme cocktail obtained from solid-state fermentation of wheat bran by a naturally occurring strain of Aspergillus niger P-19. This enzyme cocktail consisted of cellulases, hemicellulases, pectinase, and amylases. The most effective pretreatment combination involved the use of 3% H 2 SO 4 followed by steam treatment under pressure, and enzymatic hydrolysis utilizing the crude multi-enzyme preparation. This combination resulted in the highest concentration of reducing sugars (141.04 ± 12.31 g/L), with a carbohydrate conversion rate of 98.49% when a substrate loading of 20% was used. As a result, an ethanol yield of 43.2 ± 3.82 g/L, representing 21.6% based on dry matter, was achieved. Furthermore, supplementing the medium with peptone, (NH 4 )(H 2 PO 4 ), and ZnSO 4 at a concentration of 0.1% w / v each, along with solid loadings of 22% and 24%, respectively, achieved yield improvements of 51.67 g/L and 54.75 g/L. However, the maximum productivity of 23.4% was observed with a 22% loading, compared to a yield of 22.8% with a 24% solid loading, based on dry matter.

Keywords: potato peels; pretreatment; in-house produced; multi-enzyme system; enzymatic saccharification; bioethanol (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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