Contaminated Aquifers Radioactive Water Threatens Middle East
By Markus Becker Spiegel Online 11/05/2012
The Middle East and North Africa suffer from water shortages and pump
millions of liters a day from ancient aquifers. But the water contains high
levels of naturally-occurring radioactive contamination. Experts fear this
will increase the cancer risk for millions of people.
True masters of water management once lived in the desert of what is now
Jordan. It took the Nabataeans only a few decades to carve the city of Petra
out of sandstone cliffs. In addition to crafting now world-famous decorative
tomb facades, they built a sophisticated system of water pipes and cisterns,
which made it possible for the city to exist in the dry wilderness in the
first place -- more than 2,000 years ago.
Today trucks rumble through Jordan to supply the population with drinking
water. The water sloshing back and forth in their tanks is often thousands
of years old, pumped from fossil groundwater reservoirs that filled up when
the region wasn't as dry. Millions of cubic meters of water are now being
pumped from such aquifers every day in the Middle East and North Africa. The
next hydraulic engineering project is currently underway in Jordan, at a
cost of $1.1 billion (EUR850 million). Starting in the spring of 2013, about
100 million cubic meters a year will be pumped out of the Disi aquifer in
the country's south, in addition to the 60 million cubic meters a year
already being taken from the aquifer today. The water will then be pumped
through pipelines to the capital Amman, some 325 kilometers (203 miles)
But radiation experts warn of an invisible danger. Tests have revealed that
the water contains high levels of naturally occurring radioactivity, with
samples exhibiting radiation levels well above World Health Organization
(WHO) radiation guidelines. The health risk doesn't just affect Jordan, but
virtually all of the countries in the Middle East and North Africa.
Radioactivity Up to 30 Times Higher than Safety Standards
An explosive study on the problem was published in February 2009, but it has
only attracted attention in the professional world until now. A team working
with geochemist Avner Vengosh of Duke University in Durham, North Carolina,
had tested radioactivity levels in 37 samples from the Disi aquifer.
According to the findings, published in the journal Environmental Science &
Technology, the water from the aquifer, which is about 30,000 years old, is
up to 30 times as radioactive as the WHO considers safe.
The radioactivity is caused by natural uranium and thorium that can occur in
sedimentary rock. Their decay products include radium, which can cause bone
cancer if it enters the human body. Two isotopes, radium-226 and radium-228,
with half-lives of 1,600 years and less than six years, respectively, are
Using Vengosh's data, the German Federal Office for Radiation Protection
(BfS) has now calculated the magnitude of the health risk. According to its
estimates, a person who drinks two liters of water a day from the Disi
aquifer is exposed to radiation levels of between 0.99 and 1.53
millisieverts a year, or 10 to 15 times as much as WHO considers safe.
According to the BfS, if we assume that the population receives an average
annual dose of one millisievert and has an average life expectancy of 70
years, the radioactive drinking water will increase the normal number of
deaths by four people per 1,000. When this estimate is extrapolated to the
roughly two million residents of Amman, who are to be supplied with drinking
water from the Disi aquifer in the future, it comes to about 8,000
additional deaths. The calculation only applies to the absorption of radium
that occurs when people drink the water, without taking into account other
ways in which radiation can enter the body, such as when the water is used
to irrigate fields and radiation becomes concentrated in vegetables.
Similar Geological Conditions Across the Region
Jordan is only a small part of the problem. The same geological conditions
that make the water from the Disi aquifer radioactive prevail in large parts
of the Middle East and North Africa. "The problem probably applies to all
sandstone aquifers in the region," says Vengosh, which means that it affects
hundreds of millions of people.
Only 10 percent of the Disi aquifer passes through Jordanian territory. The
rest is in Saudi Arabia, where it's called the Saq aquifer. BRGM, the French
national geological service, took samples from 64 locations in the aquifer.
According to its 144-page report published in 2008, radioactivity levels
were generally well above the WHO guidelines. "The problem of radioactive
contamination of the groundwater is complex and probably widespread," the
French geologists conclude. "It must be studied as quickly as possible,
because of its potentially critical consequences." In its research, the BRGM
encountered a strange phenomenon: Contamination with radionuclides appears
to be especially high in places where the water level in the aquifers is
declining the most precipitously. While the reasons are unclear, say the
French scientists, the water threatens to become "unfit for both human
consumption and agricultural use."
Underground Aquifers Vital for the Region
This is a worrisome conclusion, since fossil groundwater is now essential
for the survival of agriculture in the region. According to the BRGM, the
amount of water being pumped from the Saq aquifer increased more than
fourfold from 1985 to 2005, from about two billion to more than 8.7 billion
cubic meters per year. Saudi Arabia already derives about half of its water
Israel also pumps water from fossil reservoirs to irrigate its fields in the
Negev Desert, and Egypt has pumped fossil groundwater in oases since the
1980s. But Libya operates the world's largest pumping operation, the "Great
Man-Made River." Every day, about 1.6 million cubic meters of water are
pumped from the Nubian Sandstone Aquifer System, at a rate of more than
18,500 liters per second. When it is finished, the massive system of wells,
pipelines and reservoirs is expected to conduct 6.5 million cubic meters of
water a day from the desert to Libya's coastal cities. It's water they
urgently need. Their own aquifers are now so heavily depleted that they are
becoming brackish as a result of seawater infiltration, a problem that also
plagues other coastal cities in the region.
Saudi Arabia, at least, is treating fossil groundwater and removing
radioactive particles, says Christoph Schüth of the Technical University of
Darmstadt in western Germany. But elsewhere, especially in rural parts of
North Africa, the situation is "problematic." The quality of the groundwater
from the Nubian Sandstone system, says Schüth, has presumably been "studied
only very incompletely," and Libya lacks water-treatment technologies. "In
principle," say Schuth and his colleagues, "this affects many sandstone
aquifers." They published the results of their research in 2011 in the
International Journal of Water Resources and Arid Environments.
Experts See Jordan 's Plan as Wishful Thinking
The Jordanian Ministry of Water and Irrigation (MWI) doesn't see the
radiation as a problem, claiming that its tests produced much lower results
than those of the US experts. The MWI engineers also plan to dilute the
water with water from sources with no radioactivity, which they say will
reduce the annual radiation exposure to 0.4 millisieverts.
But even that dose, which would still be four times as high as the WHO
standard, will be very difficult to achieve. According to an internal
document produced by Germany's Federal Institute for Geosciences and Natural
Resources (BGR), the Jordanians measured radioactivity levels in a part of
the Disi aquifer where radium activity is especially low. Most of the water,
however, is to be obtained from a part of the aquifer where radiation levels
are much higher. According to the BGR, it would take the addition of at
least one billion cubic meters of non-contaminated water a year to bring
exposure to levels below the WHO standard. It is unclear where this much
water would come from, and the MWI did not respond when asked about the
issue. The ministry is also unwilling to say whether Jordan plans to treat
the water the way Saudi Arabia does. Officials say that they cannot provide
any specific information at the moment, because they must first conduct more
analysis and collect more data.
First Signs of Genetic Damage
This is surprising, given the Jordanians' contractual obligations. One of
the largest financial backers of the Disi project is the European Investment
Bank (EIB), which approved loans totaling $225 million in May 2009. In its
contracts with the EIB, Amman pledged to begin testing the water from every
well during the construction phase, and to submit regular reports. If Jordan
failed to fulfill this obligation, "the EIB could revoke the loan in an
extreme situation," warns a bank spokeswoman.
In early November, the EIB was still waiting for the complete report, which
the Jordanians were supposed to submit at the end of September. They have
already provided the bank with readings for about half the wells, which,
according to the EIB, show that the average annual dose of radioactivity "is
still above the allowed limit."
There are already initial signs of the possible health consequences. In
2010, King Saud University examined 10 men who change filters in underground
wells. Their blood was found to contain 11 times as much chromosomal damage
than that of controls, it said in an article in the journal Radiation
Protection Dosimetry. These changes in genetic material can lead to cancer
and illnesses in offspring.
Still, the use of fossil water could end up being the lesser of two evils.
Although some of the water contains high radiation levels, it is otherwise
considered very clean and free of bacteria. "What would happen if people
consumed water of lesser biological quality instead?" asks Clemens Walther
of the Institute for Radioecology and Radiation Protection at the University
of Hanover in northern Germany. According to Walther, this would lead to
more deaths than those resulting from radiation, partly from elevated
numbers of dangerous diarrheal disease in children.
Translated from the German by Christopher Sultan