Microplastics and PFAS Contamination: The Hidden Dangers of Wastewater Treatment Plants

Summary

A study reveals that wastewater treatment plants remove 99% of microplastics and some PFAS chemicals from water. However, these contaminants remain in biosolids, which are often used as fertilizer on farmland. Researchers emphasize the need to stop producing microplastics and PFAS, as current disposal methods continue to contribute to environmental pollution.

Key Points

• Wastewater treatment plants effectively remove contaminants from water but concentrate microplastics and PFAS in biosolids.
• Most biosolids are used as fertilizer in agriculture, reintroducing these contaminants into the environment.
• Preventing the production of microplastics and PFAS is essential for reducing pollution.

Study Details

Scientists analyzed leachate from four Illinois landfills and the inflows and outflows of wastewater treatment plants. They focused on microplastics and PFAS. While landfills retain much plastic waste, wastewater treatment plants manage to remove significant amounts of these contaminants, but they accumulate in biosolids.

According to the National Biosolids Data Project, around 70% of biosolids from Illinois plants are used as fertilizers on agricultural land, while 30% are sent to landfills. This means microplastics and PFAS are reintroduced into the environment through farming practices. John Scott, a scientist involved in the study, noted that wastewater treatment facilities transfer contaminants from one medium to another.

Globally, the production of plastics is in the hundreds of millions of tons each year. An estimated 79% of this waste ends up in landfills or pollutes the environment. Both microplastics and PFAS can be found in soil, water, and human bodies.

Research Findings

The study highlights the combined impact of landfills and wastewater treatment plants, which are often studied separately. This joint analysis examines the fate of microplastics and PFAS. The researchers discovered high PFAS levels in landfill leachate, while microplastics were less prevalent than expected.

Wastewater treatment plants process vast amounts of wastewater, which carries a load of microplastics and PFAS. These facilities handle approximately 10,000 gallons of wastewater per minute, compared to around 30,000 gallons of landfill leachate each day.

Challenges and Solutions

The accumulation of microplastics and PFAS in biosolids presents a challenge. Spreading these contaminants on cropland is not a good practice, and burying them only shifts the problem without a solution. Treating biosolids before disposal is costly. Scott suggests focusing on preventing plastic and PFAS pollution at the source.

Research indicates a pressing need to reduce the production of these materials before they contribute further to environmental issues.