Studies on urine treatment by biological purification using Azolla and UV photocatalytic oxidation |
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Authors: | Xiaofeng Liu Min Chen Zuliang Bian Chung-chu Liu |
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Institution: | 1. Academy of Life Sciences, Peking University, Beijing 100871, China;2. Fujian Academy of Agricultural Sciences, Fujian 350003, China |
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Abstract: | The amount of water consumed in space station operations is very large. In order to reduce the amount of water which must be resupplied from Earth, the space station needs to resolve the problems of water supply. For this reason, the recovery, regeneration and utilization of urine of astronauts are of key importance. Many investigations on this subject have been reported. Our research is based on biological absorption and, purification using UV photocatalytic oxidation techniques to achieve comprehensive treatment for urine. In the treatment apparatus we created, the urine solution is used as part of the nutrient solution for the biological components in our bioregenerative life support system. After being absorbed, the nutrients from the urine were then decomposed, metabolized and purified which creates a favorable condition for the follow-up oxidation treatment by UV photocatalytic oxidation. After these two processes, the treated urine solution reached Chinese national standards for drinking water quality (GB5749-1985). |
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Keywords: | Azolla Bioregenerative life support system Urine purification Instrument Photocatalytic oxidation Space life support Water regeneration Water reuse |
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