Bioethanol production from expired cookies and economic analysis for practical application

Zheng, Xietian; Chen, Xikai; Pei, Yanbo; Wang, Su; Zhang, Zhengxian; Huang, Jingang; Xu, Xiaobin; Tang, Junhong; Hou, Pingzhi; Han, Wei

doi:10.1016/j.scitotenv.2022.157302

Cited by 6 publications

(1 citation statement)

References 47 publications

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“…Its utilization is the potential in reducing worldwide reliance on conventional non-renewable fossil fuels. A number of unused materials have been investigated by scientists for the production of bioethanol, for example from food left-over [1], vegetable or fruit waste [2], expired cookies [3], microalgae [4,5], grain residues such as coffee [6] and lignocellulose biomass such as rice straw [7].…”

Section: Introductionmentioning

confidence: 99%

Improving the Value of Spent Coffee Ground by Converting Carbohydrates into Sugars by Saccharomyces cerevisiae to Produce Bioethanol

Syahruddin,

Lisdiana,

Erdawati

2023

Advances in Physics Research

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Spent coffee grounds contained 45% carbohydrate, 26% lignin, 13% lipid, and 13% protein. To improve the value of spent coffee grounds in a sustainable way, a study was done on how to convert carbohydrates into fermentable sugars which could be used to make value-added products. To accomplish this, a pre-treatment process, followed by acid-promoted hydrolysis, fermentation using Saccharomyces cerevisiae, and a distillation process, were performed to obtain bioethanol. The purpose was to find out the effect of various sulphuric acid concentrations and periods of fermentation on bioethanol yield. Analysis of the bioethanol content was performed using Chromatography gas. The result showed that a slight increase in sulphuric acid concentration, triggered higher glucose production, reaching optimum level at 0.1 M, then lowered gradually. Furthermore, as fermentation time increased, bioethanol yield from glucose conversion also increased, reaching a peak at day 4, then decreasing gradually on subsequent days. This study revealed that 10 g of spent coffee ground, subjected to hydrolysis using 200 ml of 0.1 M sulphuric acid, run at 55 °C for 60 min, and fermentation over 4 days period, produced 40% bioethanol.

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