Developing novel biorefineries using food waste as substrate

Kiran, Esra Uckun and Trzcinski, Antoine P. and Liu, Yu (2014) Developing novel biorefineries using food waste as substrate. In: 248th American Chemical Society National Meeting & Exposition , 10-14 Aug 2014, San Francisco, California.

Abstract

Introduction - One third of food produced globally for human consumption is lost along the food supply chain1. In Asia, food waste is often landfilled or incinerated with other combustible municipal wastes for possible recovery of heat or other forms of energy. However, incineration is an expensive waste conversion technique and causes air pollution. In fact, due to its nutrients-rich composition food waste is a useful resource for production of energy and high-value platform chemicals through fermentation. Starch is the main biopolymer in food waste2, thus the saccharification of food waste is the most important step for its bioconversion into value-added products. The objective of this study is to maximize glucose yield from food waste enzymatically. Commercial enzyme utilization increases the operational cost due to the purchase of these enzymes on a regular basis. In order to decrease the costs, enzyme solution was produced by solid state fermentation using food wastes as sole nutrient source.

Results and Discussion - In situ produced enzyme (ISPE) provided higher glucose yields in comparison to commercial enzymes, in shorter time and without any liquefaction step. Glucose concentration using ISPE reached 97 g/L after 8h hydrolysis. The enzymatic hydrolysis of food waste resulted in 51-62% solids reduction. The effect of enzymatic pretreatments on methane production potential was also tested. The lag phase was shorter using enzymatically pretreated food wastes. The cumulative methane yield improved by 36 and 39% using the commercial and in-situ enzymes, respectively.

Conclusions - In conclusion, food waste can be saccharified using ISPE effectively. The glucose concentration and the saccharification degree obtained during the hydrolysis are sufficient enough to produce various kinds of biofuels and high-value platform chemicals. The utilization of food waste in an integrated biorefinery approach will provide an economical and sustainable waste management system in long term.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Abstract only published online.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 10 Jul 2018 06:20
Last Modified: 04 Sep 2018 01:30
Fields of Research : 09 Engineering > 0904 Chemical Engineering > 090405 Non-automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels)
05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management
09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970105 Expanding Knowledge in the Environmental Sciences
E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
D Environment > 96 Environment > 9611 Physical and Chemical Conditions of Water > 961101 Physical and Chemical Conditions of Water for Urban and Industrial Use
URI: http://eprints.usq.edu.au/id/eprint/34426

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