Green Infrastructure Reduces Heavy Metal Pollution and Improves Urban Water Quality

Installing green infrastructure in residential areas can significantly reduce heavy metal pollution in local waterways, suggests a new study by Ohio State University researchers. The study, part of the 30-year community effort Blueprint Columbus, found that rain gardens and constructed wetlands in Columbus' Clintonville neighborhood reduced cadmium, copper, nickel, and zinc pollution by notable amounts. This approach to managing stormwater flow at the source is crucial to preserving the environment, said Joseph Smith, lead author and researcher in food, agricultural and biological engineering.

Key Takeaways:

• The study found that green infrastructure systems in Columbus' Clintonville neighborhood reduced heavy metal pollution in local waterways, including cadmium, copper, nickel, and zinc, by notable amounts.
• The goal of Blueprint Columbus is to address sanitary sewer overflows and reduce total suspended solids pollution in runoff by 20% by 2043.
• Rain gardens, a type of green infrastructure, worked to prevent a significant amount of heavy metal pollution from entering downstream waterways in one particular neighborhood.
• The study was robust enough to determine that the changes in hydrology, water quality, and heavy metals were due to the presence of rain gardens, not seasonal or annual fluctuations in climate.
• Implementing more green infrastructure in urban areas could make ecosystems healthier and more resilient, improve water quality, and help cities be cooler due to increased green space.
• Educating homeowners about the benefits of maintaining green infrastructure is crucial for the long-term success of the project, as some citizens have opposed the addition of green systems to their neighborhoods.
• Investing in green infrastructure also helps create jobs and other lucrative economic development opportunities for the public.

Statistics:

• The study was conducted over approximately 3.5 years in two watersheds in the Clintonville neighborhood of Columbus.
• Heavy metal pollution in local waterways, including cadmium, copper, nickel, and zinc, was reduced by notable amounts in neighborhoods with installed green infrastructure.
• The goal of Blueprint Columbus is to reduce total suspended solids pollution in runoff by 20% by 2043.
• Hundreds of rain gardens already exist across the city of Columbus.
• Investing in green infrastructure helps create jobs and other lucrative economic development opportunities for the public, according to the Environmental Protection Agency.

Sources:

• Joseph Smith, et al. (2023) "Green Infrastructure in Urban Watersheds for Addressing Sanitary Sewer Overflows: A Case Study in Columbus, Ohio, USA." Journal of Hazardous Materials.
• "Blueprint Columbus: A 30-Year Community Effort to Improve Water Quality." (no date, but mentioned in the article as part of the 30-year effort).
• Environmental Protection Agency (EPA). (no date, but mentioned in the article as providing information on the benefits of investing in green infrastructure).
• Ohio State University - Columbus. (no date, but mentioned in the article as providing information on the study).