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<h2 class="hd hd-2 unit-title">Water Recycling</h2>
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<h2>3.5.1 Water Recycling</h2>
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<p><img style="display: block; margin: 20px auto 20px auto;" src="/assets/courseware/v1/222da40b881a5a21e2c888a2d3934605/asset-v1:MITx+16.00x+2T2019+type@asset+block/ISS-drinking-recycled-water_NASA_free-600.jpg" alt="Astronauts drink water recycled from urine and other wastewater onboard the International Space Station" type="saveimage" target="[object Object]" /></p>
<p style="text-align: center;"><em><span style="font-family: 'Open Sans', Verdana, Arial, Helvetica, sans-serif;">Astronauts drink water recycled from urine and other wastewater onboard the International Space Station <br />(Image credit: NASA)</span></em></p>
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<p>Like oxygen, water is a precious resource in space. You may have heard rumors that astronauts on the International Space Station have to drink water recycled from their own urine. Well, it's true! Onboard the ISS, wastewater --- be it urine or grey water from cleaning and cabin humidity --- is carefully collected, treated, and reused. In the following video, Prof. Hoffman describes several approaches for recycling water in space, as well as the special challenges associated with carrying out these processes in a microgravity environment.</p>
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<h2 class="hd hd-2 unit-title">Water Recovery System</h2>
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<h2>3.5.2 Water Recovery System</h2>
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<p><img style="display: block; margin: 20px auto 20px auto;" src="/assets/courseware/v1/d0b9524a46107267a4408d9f9dd53fc8/asset-v1:MITx+16.00x+2T2019+type@asset+block/ISS-Water-Recovery-System-550.png" alt="NASA's Water Recovery System for the International Space Station" type="saveimage" target="[object Object]" /></p>
<p style="text-align: center;"><em><span style="font-family: 'Open Sans', Verdana, Arial, Helvetica, sans-serif;">NASA's Water Recovery System for the International Space Station (Image credit: NASA)</span></em></p>
<p>Now that we've discussed the basic idea behind water recovery in space, let us look at the hardware that make the process possible. In the following video, Prof. Hoffman describes the many different components of the ISS Water Recovery System and how they work together to produce usable water in space.</p>
<p>ECLSS hardware such as the Water Recovery System are very heavy and bulky. However, one of the key principles of spaceflight is minimizing the mass of the payload to be launched. This is an especially challenging issue for ECLSS, where we have to consider not just hardware mass, but also "equivalent mass." Prof. Hoffman will explain the concept of equivalent mass and why we must also factor in power consumption and heat generation when performing an ECLSS mass calculation.</p>
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<h2 class="hd hd-2 unit-title">ECLSS Onboard the ISS</h2>
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<h2>3.5.3 ECLSS Onboard the ISS</h2>
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<p>In this unit, we have discussed a variety of different environmental control and life support systems, ranging from oxygen generation to contaminant removal to water recovery. Now it's time to look at the bigger picture and understand how these systems all fit together onboard the International Space Station to provide crews with a safe, healthy, and comfortable environment in which to live and work.</p>
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<h3 class="hd hd-2">Video: ECLSS Onboard the ISS</h3>
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