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Potential impacts of microplastic-derived dissolved organic matter in water and wastewater treatment systems: A critical review and future research needs
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As microplastics break down during water treatment, they don't just leave behind tiny plastic bits, they can also dissolve into invisible chemical byproducts that mix into the water itself. This review of existing research shows these dissolved substances may make water treatment plants less effective at removing contaminants and could even contribute to the formation of harmful disinfection byproducts. While it's too early to know exactly how much this affects the water coming out of your tap, it's a reminder that our understanding of plastic pollution in drinking water is still evolving, and treatment plants may need new methods to catch what they're currently missing.
Microplastics (MPs) are widely recognized as particulate pollutants in water and wastewater treatment systems (WWTSs); however, their transformation into microplastic-derived dissolved organic matter (MP-DOM) and its potential impacts remain poorly understood. This review synthesizes current knowledge on the generation, composition, and treatment relevance of MP-DOM, an emerging fraction of dissolved organic matter (DOM) formed during photochemical, oxidative, mechanical, thermal, and biological aging of MPs within treatment processes. Available evidence suggests that WWTSs can act as active hotspots for MP-DOM formation, producing low-molecular-weight oligomers, oxidized fragments, and additive-derived compounds that persist beyond particulate removal. Compared with background DOM, MP-DOM exhibits distinct reactivity, bioavailability, and transformation pathways. We evaluate how these physicochemical properties may influence coagulation, adsorption, oxidation, membrane filtration, biological treatment, and sludge processing. Emerging studies indicate that MP-DOM can alter flocculation, compete for adsorptive and oxidative capacity, contribute to disinfection by-product formation, modulate microbial activity, and exacerbate membrane fouling. However, the magnitude and operational significance of these effects in full-scale systems remain poorly constrained due to limited field observations and reliance on simplified laboratory studies. We identify key knowledge gaps related to MP-DOM occurrence, polymer-specific generation pathways, microbial interactions, and differentiation from background DOM. Collectively, MPs should be considered not only as particulate contaminants but also as potential sources of reactive dissolved organic fractions that may influence treatment performance under increasing plastic inputs. Accordingly, monitoring strategies and process models may need to incorporate MP-DOM as a distinct compositional component of the DOM pool.
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Potential impacts of microplastic-derived dissolved organic matter in water and wastewater treatment systems: A critical review and future research needs
AI summary Read the abstract
Researchers reviewed how microplastics within water and wastewater treatment systems can age and release dissolved organic matter fractions—including oligomers, oxidized fragments, and additive-derived compounds—that persist after particulate removal and may disrupt coagulation, increase disinfection by-product formation, foul membranes, and alter microbial activity in ways not captured by current monitoring frameworks.
Potential impacts of microplastic-derived dissolved organic matter in water and wastewater treatment systems: A critical review and future research needs
AI summary Read the abstract
Researchers reviewing how microplastics behave in water treatment systems identify an underappreciated hazard: MP aging generates dissolved organic matter fragments that can disrupt coagulation, compete for adsorptive and oxidative capacity, form disinfection by-products, and accelerate membrane fouling — arguing that treatment models must account for MPs as a source of reactive dissolved organics, not just particles.
Microplastic-Derived Dissolved Organic Matter: Environmental Chemistry and Ecological Consequences
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As plastics break down in the environment, they don't just create tiny particles, they also leach invisible dissolved chemicals into water, and this review pulls together what scientists currently know about them. These dissolved substances can interact with pollutants, metals, and even contribute to harmful byproducts when water is treated for drinking, meaning microplastic pollution may affect water quality in ways beyond the visible plastic bits we usually hear about. The researchers note that scientists still need standardized testing methods to better predict the real-world risks these invisible plastic byproducts pose to ecosystems and, ultimately, human health.
Unveiling the optical and molecular characteristics of aging microplastics derived dissolved organic matter transformed by UV/chlor(am)ine oxidation and its potential for disinfection byproducts formation
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Researchers studied how UV light and common water disinfection chemicals break down microplastics in water and found that different treatment methods produce different types of dissolved organic matter from the plastic. Some treatment combinations, particularly UV with chlorine, created byproducts that could form harmful disinfection byproducts when water is later chlorinated. This is important because it means water treatment processes might unintentionally create new toxic compounds from the microplastics already present in water.
Removal of microplastics via drinking water treatment: Current knowledge and future directions
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This review examines what is currently known about microplastics in drinking water systems and how well existing water treatment processes remove them. Researchers found that while conventional treatment steps like coagulation and filtration do reduce microplastic levels, significant amounts can still persist through to tap water. The study calls for more research into optimizing treatment processes and developing monitoring strategies specifically targeting microplastic contamination in drinking water.
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