We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Microplastics in MSW-derived compost: release rate, characteristics, ecological risks, and mitigation strategies for sustainable agriculture
Summary
Compost made from household trash often contains tiny plastic bits called microplastics, and surprisingly, the compost from industrial facilities had even more plastic contamination than the raw waste it started from. Since this compost gets spread on farm fields, these plastic fragments can build up in the soil where our food grows. The good news: simply sorting out plastic from food/organic waste before composting (rather than mixing everything together) dramatically cuts down on this contamination, suggesting better recycling habits at home and in waste facilities could help keep microplastics out of our agricultural system.
Plastic contamination in compostable organic fractions of municipal solid waste (MSW) is a key route for microplastics (MPs) entering agricultural soils. This study investigated MP concentrations and characteristics in raw MSW organics and composts from both industrial and laboratory processes. MPs were identified using stereo microscopy, SEM, and Micro-Raman spectroscopy. Concentrations reached 63.75 ± 22.1, 253.3 ± 38.7, and 173.3 ± 30.2 items/kgdw in raw MSW, industrial, and lab-scale composts, respectively. Fragments and fibers dominated, with over 50% sized between 500–5000 µm. Transparent MPs were most common in industrial compost; green and red ones prevailed in raw MSW and lab composts. Polyamide (PA) and polypropylene (PP) were the most frequent polymers. Pollution Load Index (PLI) values indicated low to moderate pollution levels. The Polymer Hazard Index (PHI) showed high hazard in industrial compost and low to medium in other samples. Source separation of MSW significantly reduced MPs in compost, underscoring its importance in waste management strategies.