Tapping into our resources: SA engineers are trying to solve the global water crisis | GroundUp_News
to plants; they simply require a source that is richer than the atmosphere.
But natural gas has become more common as part of a drive to reduce environmental impacts. It is a far cleaner-burning fuel with flue gas suitable for greenhouse COfrom the atmosphere. Membranes that are highly selective to COcapture but entirely suitable for partially enriching an air stream to feed a greenhouse.
The simplest and most appealing form of this is one of a bio-digester that processes sewage along with agricultural and kitchen waste to produce biogas as an energy source, with the resulting CO-rich flue gas returned to the greenhouse and the digestate from the digester used as a fertiliser.
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