Optimization of bioethanol production from cassava peels

S.O Osemwengie,B Onwukwe,E.I Osagie

doi:10.4314/jasem.v24i12.11

S.O Osemwengie, B Onwukwe + Show 1 more

Open Access

https://doi.org/10.4314/jasem.v24i12.11

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Abstract

The bioethanol production from waste is acquiring attraction as a strategy for increasing energy security. This study aims to optimize the production of ethanol from cassava peel using Box Bhenken experimental design. The total carbohydrate content of about 90% in cassava peel was subjected to enzymatic hydrolysis using Alpha-amylase followed by Simultaneous Saccharification and Fermentation (SSF) by Saccharomyces cerevisiae for bioethanol production. The production of bioethanol from cassava peels was investigated for 1-4 hours (hydrolysis time), 0.5–1.5mg/L (enzyme loading), and 1-5 days (incubation time). A statistical model was developed and validated to predict the yield of bioethanol after fermentation, and the Response Surface Methodology (RSM) was used to optimize the conditions. The results revealed that the maximum ethanol yield of 1.911% was obtained at the optimum hydrolysis time, enzyme loading, and incubation time (i.e. 2.5 hours, 1 mg/L, and 3 days respectively).

Highlights

The bioethanol production from waste is acquiring attraction as a strategy for increasing energy security
World production of cassava root was estimated by FAO (2012) to be 230 million tonnes in 2008 with Nigeria accounting for about 54 million tonnes as the world's largest producer of cassava
During the processing of the cassava to obtain food, a solid waste material known as cassava peels are generated. (Amenaghawon et al, 2014), which has been (Prado et al, 2005) identified as a high cellulose material which makes it a potential substrate for the production of value-added products such as organic acids, bioethanol, biopolymers, etc

Summary

Introduction

The bioethanol production from waste is acquiring attraction as a strategy for increasing energy security. The production of bioethanol from cassava peels was investigated for 1-4 hours (hydrolysis time), 0.5–1.5mg/L (enzyme loading), and 1-5 days (incubation time). Cassava is grown for its edible starchy tuberous root which contains about 94% carbohydrate and 6% containing vitamins and proteins It is extensively produced as an annual crop in tropical countries such as Nigeria, Brazil, Thailand, etc. Large tons of cassava wastes are discarded annually in Nigeria when cassava is processed into various food products (Ozoegwu et al, 2017) These cassava wastes are removed to obtain good quality food products such as fufu, garri, tapioca macaroni, and pudding and serve as animal feeds. These wastes often end up in open dumps or drainage systems which threatens both surface water and general human health condition.

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