Ethanol Production from Waste of Cassava Processing

Abstract

Cassava processing produces by-products such as brown bark, between bark, disposal, bran, fiber and bagasse. Cassava bagasse is characterized as a source of starch that can be converted into sugars to obtain biofuels. The objective of this work was to produce ethanol from this cassava processing residue and to evaluate its contribution potential in the Brazilian energy matrix. Cassava processing residues were obtained from four different starch manufacturers in Brazil. Analysis of the chemical compositions of these samples provided the content of starch, sugar, crude grease, moisture, ash and also their pH values. For the ethanol process, the samples were submitted to enzymatic hydrolysis using the alpha-amylase and amyloglucosidases enzymes, followed by fermentation and distillation. The samples showed high starch indices, approximately 64% on average. The average yield of ethanol obtained was 30% after treatment of the sample like this. Considering the estimated volume of cassava bagasse in Brazil, it is possible to produce an average of 789 million cubic meters per bagasse, replacing about 24% of the first generation ethanol. Cassava bagasse can be considered an interesting biomass for the production of biofuels, contributing to the expansion of the energy matrix.

Jamaican Domestic Ethanol Fuel Feasibility and Benefits Analysis

“…If we assume that Red Stripe's pilot plant processes between 3,500 and 5,500 tonnes of cassava into starch annually (roughly between 50% and 75% capacity), on average, between 950 and 1,500 tonnes of peels and between 1,400 and 2,200 tonnes of pulp could be available at that location. Ethanol potential from cassava peels and pulp is estimated to be between 180 and 318 liters per tonne, or about 250 liters per tonne on average (Ogbonna et al 2018;Mithra et al 2018;Martinez et al 2018). Thus, between 625,000 and 970,000 liters of ethanol could be produced from cassava processing waste (peels and pulp) in Jamaica.…”

Alcohol yield from various combinations of cassava and sweet potato flours

“…Corn, sugar cane and wheat are major crops used globally to produce ethanol (Zabed et al, 2016;Li et al, 2016;Gupta andVerma, 2015, McMurry, 2015;Vollhardt and Schore, 2014;Boundy et al, 2011). Several studies demonstrate the use of cassava and sweet potato as raw materials for ethanol production (Costa et al, 2018;Martinez et al, 2018;Pereira et al, 2017;Schweinberger et al, 2016;Archibong et al, 2016;Swain et al, 2013;Oyeleke et al, 2012;Ademiluyi and Mepba, 2013;Ocloo and Ayenor, 2010). The search for the optimal processing conditions to hydrolyse and ferment sugars from the starches in cassava and sweet potato was the major *Corresponding author.…”

Optimization of the Supply Chain in the Production of Ethanol from Agricultural Biomass Using Mixed-Integer Linear Programming (MILP): A Case Study

“…ere is much research that assesses the feasibility of producing biofuels from various types of biomass [9][10][11][12][13] and different conversion techniques [14,15]. Currently, many research efforts are directed towards the development of efficient conversion technologies and bioethanol supply chain (Bio-Eth SC) systems that use lignocellulosic biomass like raw materials [4].…”

“…is not significantly sensitive to the amount of bioethanol; for example, in the LA1 scenario, only 6.7% 2,3,5,6,7,8,9,10,11,12,13,14,16,18,19,20,21,22,23,24,26,27,28,29,31,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,54,57,65,87,88,89…”