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Monday, February 12, 2018

Water Security. Water Recycling



Water Recycling and Reuse: The Environmental Benefits

What Is Water Recycling?

Recycle: verb
1.   a. To recover useful materials from garbage or waste
b. To extract and reuse.
While recycling is a term generally applied to aluminum cans, glass bottles, and newspapers, water can be recycled as well. Water recycling is reusing treated wastewater for beneficial purposes such as agricultural and landscape irrigation, industrial processes, toilet flushing, and replenishing a ground water basin (referred to as ground water recharge). Water recycling offers resource and financial savings. Wastewater treatment can be tailored to meet the water quality requirements of a planned reuse. Recycled water for landscape irrigation requires less treatment than recycled water for drinking water. No documented cases of human health problems due to contact with recycled water that has been treated to standards, criteria, and regulations have been reported.

Water is sometimes recycled and reused onsite. For example, when an industrial facility recycles water used for cooling processes. A common type of recycled water is water that has been reclaimed from municipal wastewater, or sewage. The term water recycling is generally used synonymously with water reclamation and water reuse.

Another type of recycled water is "gray water".Gray water, or gray water, is reusable wastewater from residential, commercial and industrial bathroom sinks, bath tub shower drains, and clothes washing equipment drains.  Gray water is reused onsite, typically for landscape irrigation.  Use of non toxic and low-sodium (no added sodium or substances that are naturally high in sodium) soap and personal care products is required to protect vegetation when reusing gray water for irrigation. National Science Foundation (NSF) International has established a wastewater treatment task group on onsite residential and commercial gray water treatment systems. They have developed a draft new standard – NSF 350 – Onsite Residential and Commercial Reuse Treatment Systems.  This standard encompasses residential wastewater treatment systems (similar to the scope of VSF/ANSI Standards 40 and 245) along with systems that treat only the gray water portion. For more information visit the NSF website Exiting EPA (disclaimer).  EPA and CDC brought together agency and academic experts to explore the science available for addressing high-priority regional needs in the areas of: 

·        Gray water exposure risk to humans and ecosystems;
·        risk management options for gray water;
·        water scarcity,

·        and trends in water use. 

.....more.    


            

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