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Practiced strategies for groundwater management against microplastic pollution: learning from experience
Summary
Tiny plastic bits from everyday waste can break down small enough to seep through soil and reach the groundwater we rely on for drinking water, and this review of 123 studies found that scientists still lack standardized methods to detect and measure this contamination consistently. While using microbes to break down these plastics shows promise as an affordable cleanup solution, the researchers say the real priority should be stopping plastic pollution at the source before it ever reaches underground water supplies, since current policies and cleanup technologies aren't yet strong enough to solve the problem after the fact.
Today, the usage of plastic has been normalized across a wide range of products from essential medical apparatuses to daily convenience-seeking behaviors, thereby achieving a ubiquitous presence. While plastic waste management became one of top policy agendas in 21st century, concerns have escalated regarding the hazardous risks associated with the degrading nature of plastics and subsequent transport of smaller plastic particles. Given the urgent need for a comprehensive understanding of their occurrence, transport, ecological consequences, and potential remediation strategies, a scoping review of 123 articles selected from Web of Science and Google Scholar was conducted. The review confirmed that the fragmentation of plastics into micro- and nanoplastics facilitates their vertical migration through natural sub-surface filtration barriers to contaminate groundwater aquifers. Yet, the establishment of a systematic framework, encompassing a standardized global definition of plastic particles by size and the harmonization of experimental protocols, remain in its early development stage that information sharing for cross-studies on the detection, analysis, and removal of plastic particles from various environmental compartments is limited. Among the studied physical, chemical, and biological remediation approaches, the biodegradability of plastic particles has emerged as a scalable, economically feasible, and sustainable solution; however, the challenge lies in identifying site-specific microbial strains capable of targeting distinct polymer species prevalent in subject aquifer. While governmental interventions through preventive measures represent a commendable effort, especially since detection and remediation technologies are still under development; their actual contribution to plastic waste reduction remains questionable, as a significant portion of these policies relies on voluntary compliance or limited bans on single-use plastics in daily consumption. Thus, policy implications underscore two primary pillars: first, prioritizing surface-level plastic source control to intercept the migration of contaminants into subsurface ecosystems, and, second, accelerating the standardization of experimental protocols to facilitate a global database for polymer characterization.