We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
A Critical Review of Domestic Wastewater Pollutants: Exposure Pathways and Treatment Technologies
Summary
Nearly half the world's household wastewater goes untreated, and this review of existing research finds that everyday items like salt from water softeners, toilet paper, and cleaning products make up most of the pollution by weight—but smaller amounts of drugs, "forever chemicals" (PFAS), heavy metals, and microplastics matter too, because they don't break down easily and can affect our bodies even in tiny amounts. The concerning part: standard treatment plants often aren't good at filtering out these persistent pollutants, meaning they can end up back in our water supply, while better technologies exist but are too expensive or energy-intensive for wid
Domestic wastewater is a chemically complex and highly variable mixture of pollutants generated by everyday household activities, yet its contribution to environmental contamination is still frequently underestimated and only 56% of wastewater worldwide is being treated. This review provides a structured and quantitative assessment of major domestic wastewater pollutant groups, their principal exposure pathways, and current and emerging treatment technologies. Beyond a conventional narrative synthesis, the review derives per capita annual emission estimates from published data and uses these to compare pollutant groups by mass flow and environmental relevance. The analysis shows that high-volume household inputs, particularly sodium chloride from domestic water softening, toilet paper, personal-care products, detergents, and cleaning agents, can contribute substantially to overall pollutant loads, whereas lower-mass contaminants such as pharmaceuticals, antibiotics, PFAS, heavy metals, and microplastics remain critical because of their persistence, biological activity, and incomplete removal during treatment. The review further highlights that conventional wastewater treatment systems are often poorly equipped to remove many of these emerging contaminants effectively, especially under decentralised or only partially advanced treatment conditions. Advanced and hybrid technologies, including membrane bioreactors, nanofiltration, reverse osmosis, adsorption, photocatalysis, and electrochemical processes, offer clear potential, but their broader implementation remains constrained by cost, energy demand, fouling, and concentrate management. Overall, the added value of this review lies in linking mass-based pollutant prioritisation with treatment performance, thereby providing a more systematic basis for identifying dominant household emission pathways and for guiding targeted mitigation and technology selection in future wastewater management.