Wrong chemical dumped into Olympic pools made them green, smelly—and unsafe
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Beth Mole
After a week of trying to part with
green tides in two outdoor swimming pools, Olympic officials over the
weekend wrung out a fresh mea culpa and yet another explanation—neither of which were comforting.
According to officials, a local
pool-maintenance worker mistakenly added 160 liters of hydrogen peroxide
to the waters on August 5, which partially neutralized the chlorine
used for disinfection. With chlorine disarmed, the officials said that
“organic compounds”—i.e. algae and other microbes—were able to grow and
turn the water a murky green in the subsequent days.
The revelation appears to contradict
officials’ previous assurances that despite the emerald hue, which first
appeared Tuesday, the waters were safe.
“Of course it’s an embarrassment,” Gustavo Nascimento, director of venue management for the Rio Olympics, told the New York Times.
“We are hosting the Olympic Games, and athletes are here, so water is
going to be an issue. We should have been better in fixing it quickly.
We learned painful lessons the hard way.”
Nascimento said it took a while to figure out
what happened because hydrogen peroxide wasn’t supposed to be used at
all, and it was not detected by initial tests. “The electronic
monitoring system that measures the amount of chlorine in the water was
betrayed by this chemistry,” he said. Officials had previously blamed
the pools’ swamp-like shade on algae, people, and a shortage of an
unnamed chemical.
Hydrogen peroxide is sometimes used in pools—often to de-chlorinate them. Basically, the chemical, a common household disinfectant, is a weak acid that reacts with chlorine
and chlorine-containing compounds to release oxygen and form other
chlorine-containing compounds. Those may not be good at disinfecting
pools, but they still may be picked up by monitoring systems.
Hydrogen peroxide can also be used to
disinfect pools but must be maintained in the waters—not a one-time
dumping—and can’t be used in combination with chlorine.
On Saturday, officials started draining and
refilling one of the affected pools—the one used for synchronized
swimming, a sport that requires underwater visibility. The
3,725,000-liter pool was refilled with water from a clean practice pool
nearby. The diving pool, the first to turn green, is being filtered and
treated to clean the waters.
By the end of last week, athletes and media reported that the waters had begun to irritate eyes and smell like farts.
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