Error message

Image resize threshold of 10 remote images has been reached. Please use fewer remote images.

National Pollutant Discharge Elimination System

National Pollutant Discharge Elimination System

Photo by Jay, Moe and Zoey

National Pollutant Discharge Elimination System

Location: Ames Water Pollution Control Center, Ames, IA
Featuring: Mark

Under the Clean Water Act of 1972, water pollution control facilities in the U.S. are required to have an NPDES permit in order to discharge water to waterways.

NPDES permits regulate how much flow can be discharged to a receiving stream and set limits on pollutants such as biochemical oxygen demand, total suspended solids, and ammonia nitrogen.The Ames facility [shown here] was issued a permit by the Iowa Department of National Resources (DNR), with approval from the EPA. It is allowed to discharge 21 million gallons per day (MGD) but averages 6.

Shown in this picture: wastewater with ammonia and organic matter is pumped into the top of a trickle filter. It passes through a plastic matrix composed of corrugated plastic sheets and hollow cylinders lined with biofilm. These microbes reduce the biochemical oxygen demand and ammonia before it is discharged into the Skunk River.

Add your thoughts to this conversation

Log in or register to post comments

Posts nearby

Location: Hanson Beeyard, Fort Lupton, Colorado Featuring: Larry, Craig, Gary, and Brian Since 2005 many bee colonies around the globe have mysteriously disappeared. Everything from cellphone... Read more
By The Producer, Feb 28
Featuring: Bill and Nicolette Niman Location: BN Ranch, Marin, CaliforniaThe Niman’s secret for “antibiotic-free” beef production is simple: fresh air, sunshine, and exercise make for healthy... Read more
By Douglas Gayeton, May 19
2 followers
Location: The Honey House, Ballard Bee Company, Seattle, Washington Featuring: Corky Luster Corky says: “Honey around the entractor, honey on the door, honey on my left boot that is now on the... Read more
By The Producer, May 20