The aim of the study was to assess the effects of high concentrations (10 % w/w, data projected for 2030) of commercial bioplastics, i.e. starch based shopping bags (SBSB) and polylactic acid (PLA) tableware, in the organic fraction of municipal solid wastes (MSW) on compost quality obtained by pilot-scale dry mesophilic anaerobic digestion and subsequent composting of the digestate. After the biological processes, 48.1 % total solids (TS) of SBSB and 15 % TS of PLA degraded, resulting in a high bioplastics content (about 18 % TS) in compost. Subsequent compost incubation in soils indicated that bioplastics degraded by pseudo-zero order kinetics (0.014 and 0.010 mg C cm−2 d-1 for SBSB and PLA, respectively), i.e. complete degradation was expected in 1.6 years (SBSB) and 7.2 years (PLA), confirming the intrinsic biodegradability of bioplastics. Nevertheless, enhancing the rate and amount of bioplastics degradation during waste management represents a goal to decrease the amount of bioplastics reaching the environment.

Degradation of bioplastics in organic waste by mesophilic anaerobic digestion, composting and soil incubation / M. Cucina, P. De Nisi, L. Trombino, F. Tambone, F. Adani. - In: WASTE MANAGEMENT. - ISSN 0956-053X. - 134(2021 Oct), pp. 67-77. [10.1016/j.wasman.2021.08.016]

Degradation of bioplastics in organic waste by mesophilic anaerobic digestion, composting and soil incubation

M. Cucina
Primo
;
P. De Nisi;L. Trombino;F. Tambone;F. Adani
Ultimo
2021

Abstract

The aim of the study was to assess the effects of high concentrations (10 % w/w, data projected for 2030) of commercial bioplastics, i.e. starch based shopping bags (SBSB) and polylactic acid (PLA) tableware, in the organic fraction of municipal solid wastes (MSW) on compost quality obtained by pilot-scale dry mesophilic anaerobic digestion and subsequent composting of the digestate. After the biological processes, 48.1 % total solids (TS) of SBSB and 15 % TS of PLA degraded, resulting in a high bioplastics content (about 18 % TS) in compost. Subsequent compost incubation in soils indicated that bioplastics degraded by pseudo-zero order kinetics (0.014 and 0.010 mg C cm−2 d-1 for SBSB and PLA, respectively), i.e. complete degradation was expected in 1.6 years (SBSB) and 7.2 years (PLA), confirming the intrinsic biodegradability of bioplastics. Nevertheless, enhancing the rate and amount of bioplastics degradation during waste management represents a goal to decrease the amount of bioplastics reaching the environment.
Anaerobic digestion; Biodegradability; Composting; Polylactic acid; Starch-based bioplastics; Anaerobiosis; Soil; Solid Waste; Composting; Waste Management
Settore GEO/04 - Geografia Fisica e Geomorfologia
Settore AGR/13 - Chimica Agraria
Settore ICAR/03 - Ingegneria Sanitaria-Ambientale
Settore CHIM/07 - Fondamenti Chimici delle Tecnologie
17-ago-2021
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/877466
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