Heat for the building and methane for electricity generation are the intended products of a vertical algae farm on an exterior wall of a Hamburg apartment complex. The wall system developed by Colt Group injects nutrients and carbon dioxide into the algae-laden wall, along with compressed air to keep the algae from settling. Harvested algae is stored in tanks in the building before being processed for methane, and the algae wall doubles as a solar heat collector for the building.

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