Removal of nitrate from water by foam-immobilizedPhormidium laminosum in batch and continuous-flow bioreactors |
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| Authors: | Carlos Garbisu Jone M. Gil Michael J. Bazin David O. Hall Juan L. Serra |
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| Affiliation: | 1. Biosphere Sciences Division, King's College London, Campden Hill Road, London, W8 7AH, UK
2. Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias, Universidad del País Vasco, Apartado 644, E-48080, Bilbao, Spain
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| Abstract: | Cells of the non-N2-fixing cyanobacteriumPhormidium laminosum were immobilized in polyurethane (PU) foams either by absorption or by entrapment in the PU prepolymer followed by polymerisation and by adsorption onto polyvinyl (PV) foams. Although entrapment caused toxicity problems which lead to rapid death of the immobilized cells, they were immobilized successfully by adsorption onto PU or PV foams and maintained their photosynthetic electron transport activities (PS I, II, I + II) for at least 7 weeks. Changes in the morphology resulting from immobilization, as revealed by scanning electron microscopy (SEM) and low temperature-SEM, were investigated. Batch cultures and a continuous-flow packed bed photobioreactor were used to study nitrate removal from water. The effects of light intensity and CO2 concentration on bioreactor performance were studied with respect to the nitrate uptake efficiency of the system. It was concluded thatP. laminosum immobilized on polymer foams is of potential value for biological nitrate removal in a continuous-flow system. author for correspondence |
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| Keywords: | nitrate removal cell immobilization polymeric foams bioreactor immobilized cells Phormidium laminosum |
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