Pollution characteristics of aerosol particles in landfill waste mining and its effects on microbial community structure
In order to understand the pollution characteristics of microbial aerosols associated with waste mining in landfills,microbial aerosol samples were collected from different regions of a landfill mining site in Tongren,Guizhou Province,utilizing an Andersen six level air microbial sampler.This study investigated the concentration distribution patterns of culturable bacteria and fungi in aerosols during waste mining,and the morphological and physicochemical characteristics of aerosol particles and their influence on microbial community structure.The results showed that:①The concentration of culturable microbial aerosol was highest in the mechanical working area(mining area and screening area),followed by downwind direction of plant boundary and lowest in the upwind direction of plant boundary.② Galbibacter marinus,Chryseolinea sp.,Arthrobotrys amerospora and Pseudallescheria angusta were the predominant strains in the aerosol particles.③The morphological characteristics and mineral compositions of aerosol particles in the waste mining area were diverse,mainly consisting of irregular aggregates,slightly regular large chunks and smooth spherical surfaces,and the main mineral types included silicaluminate/silicooxide minerals,silica-aluminum fly ash and iron oxide particles.④Most of the water-soluble ions in the particles were negatively correlated with the dominant strains,and the water-soluble ions such as F-,Cl-,Ca2+,K+were positively correlated with bacteria like Rhodothermaceae sp.and Actinomarinales sp..⑤Heavy metals,such as Zn,Pb,Cr,As and Ni,in particles can inhibit the growth and reproduction of most bacteria and fungi.
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