Purdue lab works to improve conditions at indoor swim... (lor change depending on the chemical mak...)

Purdue lab works to improve conditions at indoor swimming pools

Date:2/19/2008

lor change depending on the chemical makeup of the samples. The test, however, fails to distinguish between various types of chemical compounds.

"Basically, what we want to do is relate our measurements to the operating characteristics of the pool," Blatchley said. "To address this issue, we are collecting samples from a number of public pools and analyzing them to determine the concentrations of volatile disinfection byproducts that are present in operating pools."

That research is being conducted by three members of Blatchley's group: graduate students William Weaver and Yuli Wen and undergraduate student Jessica Johnston.

"We are also examining what can be done to the water to improve the chemistry once these chemicals have been formed," Blatchley said. "In other words, how can you break down the disinfection byproducts or prevent their formation""

New research is focusing on what happens when disinfection byproducts are treated with ultraviolet radiation. Findings indicate that some inorganic disinfection byproducts containing nitrogen that are subjected to ultraviolet radiation break down to "more or less innocuous compounds," Blatchley said.

The disinfection byproducts are converted to several compounds, including nitrates and nitrous oxide, also known as laughing gas.

"Currently, we know where about 75 percent of the nitrogen goes, and we think we know where most of the rest of it goes, but we need to do some experiments to confirm that," he said.

These findings also will shed light on what happens to drinking water when treated with ultraviolet radiation.

"Sometimes ultraviolet radiation and chlorine are used together to treat drinking water," Blatchley said. "The chemistry is very similar in both settings, so our interest in those reactions is broader than just swimming pools.

"We have a pretty good understanding of what UV radiation does to microorganisms, but what it does to
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Contact: Emil Venere
venere@purdue.edu
765-494-4709
Purdue University
Source:Eurekalert

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