Synergistic Bioremediation: Metagenomic Analysis of Engineered Bacillus Consortia in the Accelerated Degradation of Microplastics in Synthetic Wastewater
- May 24
- 2 min read
DOI: https://doi.org/10.66715/jsccr/2026v3.i4.1633 | Original Research | 2026 | Volume 3 | Issue 4 | Page 16-33
Dr. Shahan Layek, Independent Researcher, West Bengal, India, Email: layekcallmeshahan@gmail.com
ABSTRACT
BACKGROUND: The exponential accumulation of microplastics in global aquatic ecosystems represents a critical environmental and public health challenge. Conventional wastewater treatment facilities are currently inadequately equipped to filter or chemically degrade these persistent synthetic polymers. While individual microbial strains have exhibited limited plastic-degrading capabilities, engineered microbial consortia offer a highly promising alternative for synergistic bioremediation. This study investigates the accelerated degradation of microplastics using an engineered Bacillus consortium in a synthetic wastewater environment and characterizes the underlying enzymatic pathways through advanced metagenomic analysis.
METHODS: A standardized synthetic wastewater medium was spiked with uniform microplastic polymers, specifically low-density polyethylene and polystyrene. An engineered microbial consortium comprising four specialized Bacillus species was introduced into the bioreactor and incubated under controlled environmental conditions for a duration of sixty days. The overall degradation efficacy was quantified using precision gravimetric analysis, while scanning electron microscopy was utilized to assess microscopic surface morphological changes. Concurrently, comprehensive metagenomic sequencing and targeted bioinformatic analyses were conducted to identify functional genes and map the synergistic metabolic networks responsible for polymer breakdown.
RESULTS: The engineered Bacillus consortium demonstrated a profoundly accelerated degradation rate, achieving a forty-two percent mass reduction of the targeted microplastics within the sixty-day incubation period, thereby significantly outperforming individual baseline strains. Scanning electron microscopy imaging revealed extensive surface pitting, structural bio-erosion, and deep biofilm penetration into the plastic matrix. Metagenomic analysis successfully identified a massive upregulation of functional genes encoding novel polymer-cleaving esterases, depolymerases, and laccase-like enzymes. The resulting genomic data confirmed synergistic metabolic cross-feeding among the different Bacillus species, a mechanism that prevented the accumulation of toxic intermediate metabolites and optimized the complete biological assimilation of the synthetic carbon structures.
KEYWORDS: Synergistic Bioremediation, Microplastics, Bacillus Consortia, Metagenomics, Wastewater Treatment, Polymer Degradation, Bio-erosion.