The Fate and Effects of Emerging Contaminants in the Environment.

Abstract:

Emerging pollutants (EPs) widely designated as Contaminants of Emerging Concern (CECs) encompass a diverse array of both anthropogenic and naturally occurring chemical substances that have historically remained outside the scope of formal environmental monitoring programs and regulatory classification. The group spans a broad chemical spectrum, ranging from antibiotics, synthetic hormones, and personal care products to agrochemicals, manufactured nanomaterials, microplastic particles, and recalcitrant industrial chemicals including per- and polyfluoroalkyl substances (PFAS). EPs exhibit a pronounced resistance to elimination by standard wastewater treatment infrastructure, which contributes to their sustained presence in aquatic, soil, and atmospheric environments. Entry pathways into the environment encompass effluent discharges from both treated and untreated wastewater systems, runoff from cultivated lands, atmospheric deposition and contamination leaching from solid waste facilities. Collectively, these routes have resulted in their detection in surface waters, groundwater, soil profiles, sediment beds, and the tissues of living organisms worldwide. The environmental and ecological ramifications of EPs’ presence are wide-ranging: these substances induce chronic sublethal harm in non-target species, impair endocrine regulatory functions, accelerate the development of antibiotic-resistant bacterial populations, and alter the structural and functional properties of microbial assemblages. Terrestrial systems face diminished biodiversity and restricted plant productivity. Managing this multifaceted environmental challenge will require the combined application of cutting-edge treatment technologies, substantive reform of existing effluent regulations, and the construction of globally integrated and sustained monitoring frameworks.