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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
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This study investigated microbial communities in compost with and without low-density polyethylene (LDPE) plastic films. Results showed plastics did not significantly alter the overall structure of bacterial and fungal communities in mature compost.

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Area of Science:

  • Microbial Ecology
  • Environmental Microbiology
  • Compost Science

Background:

  • The ecological role of microbes in plastic degradation remains largely uncharacterized.
  • Compost environments host diverse microbial communities potentially involved in organic matter decomposition.

Purpose of the Study:

  • To assess the impact of low-density polyethylene (LDPE) films on bacterial and fungal community structure in mature compost.
  • To investigate shifts in microbial community interactions associated with plastic presence.

Main Methods:

  • Employed next-generation amplicon sequencing to analyze bacterial and fungal communities.
  • Compared microbial structures in bulk compost versus plastic-associated (PA) compost from four mature piles (2-10 years old).

Main Results:

  • Proteobacteria, Bacteroidetes, Actinobacteria (bacteria), and Ascomycota (fungi) were the most abundant taxa.
  • Significant differences in compost microbiomes were observed between facilities, linked to chemical parameters, age, and feedstock.
  • A notable shift in microbial interaction patterns was detected between bulk and PA compost, with specific cooperative interactions (e.g., Firmicutes Bacillaceae and Thermoactinomycetaceae) observed only in PA compost.
  • Despite interaction shifts, the overall diversity indices and relative microbial abundances indicated no significant effect of LDPE presence on community structure.

Conclusions:

  • The presence of LDPE films in mature compost did not significantly alter the overall bacterial and fungal community structure.
  • Microbial community composition is primarily influenced by compost facility characteristics rather than LDPE presence.
  • Specific inter-microbial cooperative dynamics may be influenced by plastic association, warranting further investigation.