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A new lung for the city
![Metro 2.png](https://static.wixstatic.com/media/b43640_53544c4b9e884f30825d7494cbd5abd3~mv2.png/v1/fill/w_650,h_246,al_c,q_85,usm_0.66_1.00_0.01,enc_avif,quality_auto/Metro%202.png)
![](https://static.wixstatic.com/media/ea71bb_50a8766a55b443559de49c4892f65de9~mv2.png/v1/fill/w_980,h_97,al_c,q_85,usm_0.66_1.00_0.01,enc_avif,quality_auto/ea71bb_50a8766a55b443559de49c4892f65de9~mv2.png)
Process
1
From microalgae we can obtain pure hydrogen, an element that is difficult to obtain on its own in nature.
2
To grow the microalgae, you only need wastewater, sunlight and carbon dioxide, a polluting gas that the microalgae absorbs and uses as a nutrient.
3
By separating the microalgae from the water, a biomass is obtained, from where the hydrogen is extracted.
4
Using electrolysis, the excess rainwater and the biomass are used to electrochemically extract the hydrogen in the form of a gas.
5
Once stored, the hydrogen can be used as fuel for the metro.
![](https://static.wixstatic.com/media/b43640_ca66c282324745e18af7a49b5e0264f5~mv2.jpeg/v1/fill/w_825,h_687,al_c,q_85,usm_0.66_1.00_0.01,enc_avif,quality_auto/b43640_ca66c282324745e18af7a49b5e0264f5~mv2.jpeg)
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