A Salty Dilemma

A desalination plant. Across 177 countries, there are now 16,000
desalination plants, many of which are concentrated in the Middle
East and North Africa where water scarcity is already a reality.As
desalination plants continue to pop up, so does a hypersaline,
chemical by-product known as brine. Credit: RoPlant

By Tharanga Yakupitiyage
UNITED NATIONS, Jan 16 2019 (IPS)

As the threat of water scarcity increasingly grows, many have
turned to the Earth’s plentiful oceans for a solution. However,
this has created a new risk threatening public and environmental
health: brine.

In a new study, the United
Nations University’s Institute for Water, Environment, and Health
(UNU-INWEH) assessed the state of desalination around the world as
countries increasingly convert sea water into freshwater for its
citizens.

“There is an increasing level of water scarcity across the
globe, but there are hot spots of water scarcity like those in the
Middle East and parts of Africa. They really need an additional
supply of water that they can use to meet the requirements of their
population,” one of the report’s authors Manzoor Qadir told
IPS.

Across 177 countries, there are now 16,000 desalination plants,
many of which are concentrated in the Middle East and North Africa
where water scarcity is already a reality.

As desalination plants continue to pop up, so does a
hypersaline, chemical by-product known as brine.

In fact, for every litre of freshwater a plant produces, 1.5
litres of brine is produced, a figure that is 50 percent more than
previously estimated.

Globally, desalination plants produce enough brine in one year
to cover all of Florida in one foot of the waste.

“Historically what we used to see was the equal volumes of
brine versus desalinated water—that is not true…there is more
brine produced than desalinated water. It really needs efficient
management,” Qadir said.

Countries are increasingly turning to the oceans as a solution
to water scarcity. Pictured here is Sri Lanka’s southern coast
near Hikkaduwa town. Credit: Amantha Perera/IPS

The study, which is the first to quantify brine production
across the world, found that just four countries are responsible
for 55 percent of global brine: Saudi Arabia, United Arab Emirates,
Kuwait, and Qatar.

Almost 80 percent of brine is produced in plants near the ocean
and are often discharged back into the ocean, posing major risks to
ocean life and marine ecosystems.

According to the UNU-INWEH report, untreated brine increases
both the temperature and salt concentration of sea water. Together,
these conditions decreases the water’s oxygen levels, impacting
sea organisms and the food chain.

The desalination process also uses toxic chemicals such as
copper and chlorine, polluting oceans when released.

As desalination plants are predicted to increase in number, the
assessment highlighted the need for improved brine management
strategies to avoid further and future environmental damage.

The report’s authors pointed to the various economic
opportunities to use brine including in the irrigation of salt
tolerant crops,  electricity generation, and even aquaculture.

“Using saline drainage water offers potential commercial,
social and environmental gains.  Reject brine has been used for
aquaculture, with increases in fish biomass of 300 percent
achieved,” Qadir said.

“”There is a need to translate such research and convert an
environmental problem into an economic opportunity,” he
added.

But first and foremost, countries need to minimise the volume of
brine produced including the adoption of more efficient modern
technologies, Qadir noted.

“[Middle Eastern countries] especially need to take concrete
action just to make sure that there is an environmentally feasible
management of brine,” he told IPS, while also acknowledging the
importance of desalination.

UNU-INWEH found that eight countries including the Maldives,
Singapore, Antigua and Barbuda and Qatar can meet all their water
needs through desalination. And it is predicted that more and more
countries will rely on such plants for their water needs.

“We need to raise the importance of global water scarcity and
the key contributions of desalinated water, but at the same time we
should not just ignore the other part of desalinated technology
which is brine production,” Qadir concluded.

The post A Salty
Dilemma
appeared first on Inter Press Service.

Source: FS – All – Ecology – News
A Salty Dilemma