88 / 2023-07-10 17:19:15

Walnut shell biochar united with clay bring microbial changes with micro-nano plastic biodegradation during pig manure composting

Micro-nano plastic; compost; walnut shell biochar; montmorillonite; bacterial community

The intention of this study was to pursue that regulating the bacterial community succession pattern to expedite the biodegradation of nano-plastics during the pig manure composting employing walnut shell biochar and montmorillonite as amendment. The walnut shell biochar with different concentration along with  montmorillonite participated into pig manure for 42 days compost to search the optimal solution. The results were discovered that the most prosperous bacterial phylum consist of Firmicutes, Proteobacteria, Chloroflexi and Bacteroidetes. The addition of biochar has dramatically arranged the bacterial community at different stages of composting, and experiment pointed out that its effect is most gratifying at 10% concentration. After 42 days of composting conspicuous folds and fissure appeared on the nano-plastics surface. Energy Dispersive Spectrometer revealed that the carbon element in nano-plastics decreased since the chemical bond fracture, and the Fourier transform infrared spectrum corroborated that C=C, C-O, C-H and -COOH abundance of nano-plastics in high dose biochar addition sharply reduced, interestingly, explicating walnut shell biochar and composting made nano-plastics biodegradable. This experiment possesses affirmatory practical meaning for elimination of potential hazards of composting application and recycling of solid waste.