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Toas Island in Venezuela is located in the
middle of Lake Maracaibo, once one of the world's largest fresh water lakes.
Sadly, for the last 60 years, all that water might as well have been aqua-colored
ink. In pursuit of petroleum under the lake, the lake has been channeled
to the sea for freight traffic that over time has allowed seawater intrusion,
making it unsuitable for drinking, cooking or other everyday needs.
Island residents were stranded, dependent on a corroded water pipeline from
the mainland that only ran twice a week for four hours, and a rusted, undependable
barge that would make two trips a week for water, when it wasn't broken
down.
"To the people on the island, water was like gold," says Mainor Vega, Business
Manager, Latin America, for Sanitaire's Water Equipment Technology (WET)
unit.
That's in the past. Thanks to WET, Toas Island is no longer dry. This past
year, the Florida-based company completed the installation of a reverse
osmosis desalinization system that is pumping 1.5 million liters of water
to Toas residents each day. For many islanders, the presence of fresh water
feels like a miracle, but it's more a matter of smart engineering and hard
work by the WET team.
"A lot of other companies are like robots, selling out of catalogs, but
we knew this job demanded a system engineered for the difficult site conditions,"
says Vega.
One of the key design features was building a system that was flexible in
its operating parameters. Depending on tide swings and seasonal shifts,
the salt levels in this area of Lake Maracaibo change drastically - ranging
from 8,000 parts-per-million all the way up to sea water levels of 32,000
ppm. The higher the salinity level, the more pressure is needed to push
water through the reverse osmosis membranes.
WET's system was designed so operators could take constant measurements
and make the appropriate pressure adjustments.
The World Health Organization defines fresh water as having salinity levels
of 1,000 ppm. In the U.S., drinking water needs to be below 500 ppm. WET's
seawater reverse osmosis systems installed in Toas Island provide water
with salinity levels under 100 ppm.
After it was designed, WET's system had to be transported by boat and truck
to the remote island. ITT Industries Goulds pumps are used to transport
the water from the lake to the clarification tanks, the multimedia filtration
system and finally to the reverse osmosis systems. The water from the desalinization
plant is sent through more than 10 kilometers of piping to a 1.5 million
liter storage tank located at the highest point of the island. Gravity does
the rest, supplying fresh water to the 2,500 households on the island.
Vega spent nearly a month on the island, working 15-hour days to oversee
the installation of the system and to train the operators. He admits that
some days were a struggle, dealing with tricky political issues and problems
like a lack of dependable power sources. But he'll never forget how WET's
system changed the island on a very human level.
"The first day with water, children were outside my window at 2 a.m., playing
in the mud because they couldn't believe there was enough extra water to
even create mud. The smiles were incredible and very real," he remembers.
The water is transforming the island on a larger scale, too.
"When we first got to the island, none of the fire hydrants operated. Now,
they are thinking about putting up small hotels and trying to build tourism,"
says Vega. "This is one of the poorest sections of Venezuela, but with water,
they now have hope and a future."
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Mainor Vega (top) and the installation of WET's desalinization system. |