New Software Measures Nitrates From Septic Systems in Groundwater

July 8, 2011

Program debuts today in a workshop at Florida State University

As a young scholar, Fernando Rios loved science and computer programming equally. So when Rios, who holds a bachelor's degree in physics from Canada's University of Waterloo, went looking for a graduate program, he discovered the Department of Scientific Computing at Florida State University (FSU), which has about 35 graduate students and launched a new undergraduate program of computational sciences in fall 2010.

Now, along with his FSU professor and colleagues, Rios has written a practical software program that could protect Florida's lakes and rivers from excessive pollutants.

"I wanted to use both my science and computing skills at the same time, not just one or the other," said Rios, who, along with associate professor of computational hydrology/geology Ming Ye, recently spent 2.5 years developing the software. The program is designed to help local and state government measure the amount of nitrates from septic systems that end up in surface water bodies such as lakes and rivers.

"In Florida, there's a lot of septic tank usage and an increased potential for increased groundwater and surface contamination," said Rios, who wrote the software known as ArcNLET (ArcGIS-Based Nitrate Load Estimation Toolkit). "When the nitrates enter groundwater, they can end up in drinking water and surface water."

Nitrates in drinking water may cause a health disorder known as methemoglobinemia, which in newborns can manifest itself as a sometimes-fatal condition called "blue baby syndrome." Discharge of nitrate-rich groundwater into surface waters also can lead to fish kills, algal growth, hypoxia, eutrophication (a bloom of phytoplankton) and outbreaks of toxic bacteria.

ArcNLET, which is free and available on Ye's website, officially will debut at a training workshop on today in the Geography Information Systems Laboratory in FSU's Bellamy Building. The workshop is geared toward employees of state, local and county governments throughout Florida.

"Basically, we just want to introduce people to the software and give them an idea of what it can do," Rios said.

The GIS-based model is easy to use "and has a shallow learning curve," said Ye, who holds a doctorate in hydrology. In addition to his classes in scientific computing, he also teaches in Florida State's department of earth, ocean and atmospheric science. "An average person can use this."

Ye, who, together with Paul Lee and Rick Hicks of the Florida Department of Environmental Protection, developed the concepts and ideas behind the septic software model, specializes in predicting how contaminants in water affect human health. Approximately one-third of Florida's population uses onsite sewage treatment and disposal systems, or septic systems, for treating domestic wastewater. Estimation of nitrate load from septic tanks to surface water bodies is critical to analysis of water resources and to environmental management. The ArcNLET software can estimate such nitrate loads.

The software research and development was funded with a two-year, $80,000 grant from the Florida Department of Environmental Protection, with an additional $60,000 extension of that grant. The development is also supported in part by the Florida Institute for Energy Systems, Economics and Sustainability at Florida State.

Source:

EurekAlert

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