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What
is Reclaimed Water?
Anh
Speer,
Ph.D.
America faces a freshwater supply shortage that already impacts two of the most populous states, California and Texas, and experts project the problem will only worsen in coming decades.
One solution to the challenge involves
reclaimed water, which allows organizations and governments to use water
recycling to ensure water sustainability and security.
Reclaimed water, or water recycling, involves
reclaiming water from a variety of sources and treating it.
Cities and businesses then use the water for
various purposes, including agriculture, irrigation, groundwater replenishment,
industrial processes, and environmental restoration.
That limits the use of potable water,
conserving it instead for drinking.
It’s a key part of plans to slow the water
shortage. It’s an issue as imperative as climate change.
A government-backed report in 2019 warned
that in as little as 50 years, some regions of the United States may see
freshwater supply reduced by as much as one third.
Some Unsettling Numbers
Fresh water suitable for drinking is
increasingly becoming a scarce commodity even as national water use rates rise
by 9% annually.
Some of the numbers around water usage offer
a reminder of the enormity of the problem. Two statistics, compiled by Green
Biz, show how much drinkable water gets wasted.
About 45% of all water used on a university
campus is for non-potable demand such as cooling systems.
In industry, 75% of water use is for
non-potable demand, including power, heating, cooling and process requirements.
Clearly, an opportunity exists in both cases
to cut down on the use of drinkable water for non-potable reasons (non-potable
simply means water that is not suitable for human consumption).
Reclaiming water and using it for these
purposes can help solve the problem.
How Water Recycling Works
Organizations and governments that commit to
using reclaimed water can make a huge impact on water supply. But it takes a
widespread effort.
In most cases, water recycling is not used to
create potable water for drinking (although it is done in some places).
Rather, reclaimed water is used for the
purposes listed above at universities and in industry -to handle jobs where
non-potable water is OK to use.
These can include the following, according to
the U.S. Environmental Protection Agency:
o Agricultural
Irrigation
o Irrigation for
landscaping in parks, rights-of-ways, golf courses
o Process water for
power plants, refineries, mills and factories
o Indoor uses such as
toilet flushing
o Dust control or
surface cleaning of roads, construction sites and other trafficked areas
o Concrete mixing and
construction processes
o Supplying artificial
lakes and inland or coastal aquifers
o Environmental
restoration
None of the above requires potable water,
although the level of treatment will vary.
And there are many sources for reclaimed
water. They include municipal wastewater, process and cooling water in
industry, stormwater, agriculture runoff, and water produced from natural
resource extraction activities.
The East Bay Municipal Utility District in
California provides an example of a water recycling program in action.
The program seeks to conserve drinking water,
provide non-potable water for irrigation and industrial operations, and reduce
pollution in the San Francisco Bay.
The program saves about 5.5 billion gallons
of potable water every year. The 2040 goal is to save 7.3 billion gallons
annually and supply water to 220,000 residents.
Whatever the exact application of reclaimed
water plans, they will become an important part of the nation’s future if we
are to maintain water security, sustainability and resilience.
Anh Speer, Ph.D.Dr. Anh Speer has a Ph.D. in Computer Science and Applications from Virginia Polytechnic Institute and State University (Virginia Tech). She has worked with companies such as AOL, Wellcare and Greystone CES as a Software Engineer and Lead Architect. She is a renowned author in the field of Wireless and Sensor Network Technologies and has published numerous technical papers in IEEE journals and magazines. She is also passionate about Clean Energy, Green Living and strives to live a sustainable lifestyle. Together with her family she created www.isustainableearth.com and is a regular writer for topics such as energy efficiency, water conservation, sustainable living and green products.
http://www.isustainableearth.com/water-conservation/what-is-reclaimed-water
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