Bioethanol Production from Liquid Waste of Rice Flour with Batch Process

Sari Ni Ketut,Tatik Sri Hajati,S Sutiyono,E Luluk,Wesen Putu,Ernawati Dira,J Jamari,E Suryani,R Handogo

doi:10.1051/matecconf/20165801003

Sari Ni Ketut, Tatik Sri Hajati + Show 7 more

Open Access

https://doi.org/10.1051/matecconf/20165801003

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Abstract

Liquid waste rice flour is abundant liquid wastes but it is still underutilized. So far, it is only used for process water in factory production, wastewater, and even regarded as environment pollution. Rice flour liquid waste has higher levels of glucose, starch and protein which can be used as one of ethanol producers. This study aims to assess the process of hydrolysis, fermentation, and batch distillation process, as well as to search for alternative raw materials products of bioethanol. There are three processes of making bioethanol, namely biological hydrolysis process done by using bacillus; the process of fermentation by using Saccharomyces cerevisiae (SC); and batch distillation. After the third process was done, the results were: glucose is 5% - 10% in the process of hydrolysis; ethanol content is 11% - 16% in the fermentation process; and the levels are high enough for bio-ethanol, which is 95% - 96% in the batch distillation process. So it can be concluded that the liquid waste of rice flour can be used as raw materials for the manufacture of alternative bioethanol.

Highlights

Bioethanol is obtained from biomass and bioenergy crops proposed as one viable alternative to gasoline (Demirbas, 2011)
The purpose of this study was to look for alternative raw materials, reviewing the process of hydrolysis, fermentation, and batch distillation process to produce bioethanol with high ethanol content
Rice flour mill effluent is the raw material came from carbohydrates types of grains, such as rice

Summary

Introduction

Bioethanol is obtained from biomass and bioenergy crops proposed as one viable alternative to gasoline (Demirbas, 2011). Lignocellulosic biomass is one of the main potential sources for the production of bioethanol global economy. Agriculture, forestry (soft wood and hard wood) and industrial waste are major lignocellulosic biomasses (Limayem et al, 2012). Balat et al, (2008) investigated the production of bioethanol from lignocellulosic biomass using process pretreatment, hydrolysis, fermentation and recovery of ethanol, obtained ethanol to levels below 16%, with a further distillation process obtained a 95-96% ethanol content. The research by Nibedita et al, (2012) on production of bioethanol from agricultural waste using PROFER pretreatment method reported an increase of the concentration of fermentable sugar after saccharification enzyme process. The conversion of glucose and xylose fermentation to ethanol requires new technologies, in order to obtain ethanol levels below 16%

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