Agricultural Residue Feedstock Selection for Polyhydroxyalkanoates Production using AHP-GRA
Princess J. Requiso1,2, Fidel Rey P. Nayve Jr.2, Catalino G. Alfafara3,
Ruby Lynn G. Ventura4, Erwin C. Escobar1, and Jey-R S. Ventura1*
1Department of Engineering Science, College of Engineering and Agro-Industrial Technology,
University of the Philippines Los Baños, College, Los Baños, Laguna 4031 Philippines
2National Institute of Molecular Biology and Biotechnology (BIOTECH),
University of the Philippines Los Baños, College, Los Baños, Laguna 4031 Philippines
3Department of Chemical Engineering, College of Engineering and Agro-Industrial Technology,
University of the Philippines Los Baños, College, Los Baños, Laguna 4031 Philippines
4University of the Philippines Rural High School, College of Arts and Science,
University of the Philippines Los Baños, Paciano Rizal, Bay, Laguna 4033 Philippines
*Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.
ABSTRACT
The potential of polyhydroxyalkanoates (PHA) as substitute to durable petroleum-based plastics is currently explored because of its biodegradability and satisfactory properties. However, its high production cost – primarily due to the cost of substrate – limits its commercialization. As a solution, lignocellulosic agricultural residues can be used as feedstock to lower the production cost. To systematically determine the best agricultural residue for PHA production, this study employed the Analytic Hierarchy Process (AHP) and Grey Relational Analysis (GRA). Based on the results, it was identified that the feedstock composition criterion was given a higher weight over the economic criterion. Additionally, conversion efficiency was ranked first in terms of the overall weights of all the criteria, followed by cellulose content and processing cost. GRA showed that corn stover was the most preferred lignocellulosic substrate for PHA production, followed by banana pseudostem and sugarcane bagasse. Sensitivity analysis also proved that corn stover is an excellent feedstock candidate, particularly if conversion efficiency and processing cost criteria are given higher weights. Related studies such as economic and life cycle analyses, as well as process improvement, may also be incorporated with the results of this study to provide comprehensive information on selecting a suitable feedstock for sustainable PHA production.
INTRODUCTION
Petroleum-based plastics such as polypropylene and polyethylene are extensively used because of their durability, stability, and favorable thermal properties. These qualities made them very suitable for many packaging applications compared with glass and paper. However, the accumulation of recalcitrant plastic wastes – together with the current petroleum problem – has become a serious issue. Every year, about 4% of petroleum resources consumed worldwide is used to produce plastics, and another 4% is used to power plastic manufacturing processes (Gourmelon 2015). Non-biodegradable plastics also progressively accumulate in nature over time, causing serious environmental impacts such as marine ecosystem destruction and land pollution. In 2010, the Philippines produced around 1.88 million metric tons (MMT) of mismanaged plastic wastes per year, with about 0.28–0.75 MMT entering the ocean (Jambeck et al. 2015). This makes the country one of the highest contributors of plastic pollution in the marine environment (Jambeck et al. 2015; Lebreton et al. 2017). . . . . read more
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