Biodegradation kinetic modeling of acrylic acid-grafted polypropylene during thermophilic phase of composting

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Sable Sunil; Ahuja Sanjeev; Bhunia Haripada

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Journal Paper

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Journal: Iranian Polymer Journal Year:2020 | Volume:29 | Issue:8 Page(s): 735-747

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Title

Biodegradation kinetic modeling of acrylic acid-grafted polypropylene during thermophilic phase of composting

Author(s)

Sable Sunil | Ahuja Sanjeev | Bhunia Haripada

Keywords

Biodegradability

Hydrolysis

Nonlinear regression

Polypropylene

Radiation grafting

Abstract

This work aims at modelling and characterizing the kinetics of biodegradation of acrylic acid-grafted Polypropylene. Different films of acrylic acid-grafted Polypropylene were prepared. These films were degraded aerobically during thermophilic phase of composting process for measurement of carbon dioxide evolution as per ASTM D 5338. The experimental data were analyzed using an eight-parameter Komilis model containing a flat lag phase. The model formulations involved Hydrolysis of primary solid carbon and its subsequent mineralization. The first step was rate controlling and it included Hydrolysis of primary slowly, moderately, and readily hydrolyzable carbon fractions in parallel. The model parameters were evaluated by means of Nonlinear regression technique. The model parameters, undegraded/hydrolyzable/mineralizable carbon evolutions and morphology revealed two typical kinetic regimes. The first five films exhibited slow degradation in the first regime involving slowly and moderately hydrolyzable carbons. They exhibited low degradability value in the range of 1. 5–, 3. 7% in 45 days. Their degradability decreased with an increase in the slowly hydrolyzable carbon refractory in nature. The remaining three films exhibited the second regime involving the moderately and readily hydrolyzable carbons. These showed relatively high degradability in the range of 4. 7–, 5. 6% in 45 days. The magnitudes of their moderately hydrolyzable carbon fractions were substantially higher than those of the first regime. All the eight films showed the absence of growth phase because of their small initial readily hydrolyzable carbon fractions. The study shows progressive enhancement in the biodegradation of effectively non-biodegradable Polypropylene with an increase in degree of acrylic acid grafting. The methods presented here can be used for the design and control of other similar systems.

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APA: Copy

Sable, Sunil, Ahuja, Sanjeev, & Bhunia, Haripada. (2020). Biodegradation kinetic modeling of acrylic acid-grafted polypropylene during thermophilic phase of composting. IRANIAN POLYMER JOURNAL (ENGLISH), 29(8), 735-747. SID. https://sid.ir/paper/1043168/en

Vancouver: Copy

Sable Sunil, Ahuja Sanjeev, Bhunia Haripada. Biodegradation kinetic modeling of acrylic acid-grafted polypropylene during thermophilic phase of composting. IRANIAN POLYMER JOURNAL (ENGLISH)[Internet]. 2020;29(8):735-747. Available from: https://sid.ir/paper/1043168/en

IEEE: Copy

Sunil Sable, Sanjeev Ahuja, and Haripada Bhunia, “Biodegradation kinetic modeling of acrylic acid-grafted polypropylene during thermophilic phase of composting,” IRANIAN POLYMER JOURNAL (ENGLISH), vol. 29, no. 8, pp. 735–747, 2020, [Online]. Available: https://sid.ir/paper/1043168/en

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