Effect of compost temperature on nutritional composition and migration of contaminant agents in PET bottles
Abstract
Home compost in PET bottles (polyethylene phthalate) may significantly reduce the amount of organic waste generated in urban environments and it is an alternative in reduced spaces. The effect of compost temperature on nutritional composition, and the migration of antimony, acetaldehyde and formaldehyde to the compost produced are evaluated. In fact, studies indicate that, depending on storage conditions, PET bottles release the above-mentioned substances. Compost containers were prepared, featuring 4 parts of organic waste (fruit and vegetable peels and vegetable residues), soil and dried leaves, at 17°C, 27°C and 37°C. At the end of the composting process of approximately 35 days, compost and slurry were collected and analyzed for fertility and for possible contamination by antimony and aldehydes. The compound presented soil conditioning potential, with pH and nitrogen contents above the minimum concentrations required by specific legislation. Further, no antimony contamination was present regardless of the temperature, while there was a significant reduction in the concentrations of formaldehyde and acetaldehyde in the compost when compared to the initial material. Results show that pet bottle composting favored the decomposition and/or volatilization of aldehydes in the process.References
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