Abstract
Hollow fibres made from polysulphone and polypropylene were used for testing the growth of Anabaena azollae. The surface properties of the fibres for attachment of cyanobacteria and the morphological features of A. azollae growing on the surfaces and in the extra capillary space of the fibres were examined by scanning electron microscopy. Three types of photobioreactors for the photosynthetic production of ammonia by A. azollae were constructed. The reactors were made of hollow fibres and fibres with a calcium alginate gel matrix in the interfibre region. Dilute ammonia produced in the medium was concentrated with a membrane separator by absorption with HCl. Ammonia production was studied with and without the inhibitor MSX. The ammonia concentration in the effluent reached 600–700 μ m with MSX and 120–350 μ m without MSX in the medium.
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