Removal of phosphate by foam-immobilized Phormidium laminosum in batch and continuous-flow bioreactors
| Autor: | Juan L. Serra, David O. Hall, Carlos Garbisu |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Cyanobacteria
biology Renewable Energy Sustainability and the Environment General Chemical Engineering Bicarbonate Organic Chemistry chemistry.chemical_element Ethylenediaminetetraacetic acid Calcium biology.organism_classification Phosphate Pollution Inorganic Chemistry chemistry.chemical_compound Fuel Technology chemistry Biochemistry Nitrate Bioreactor Chelation Waste Management and Disposal Biotechnology Nuclear chemistry |
| Zdroj: | Journal of Chemical Technology & Biotechnology. 57:181-189 |
| ISSN: | 1097-4660 0268-2575 |
| Popis: | Free-living and polyvinyl foam-immobilized cells of Phormidium laminosum were studied for their phosphate uptake characteristics. Initial phosphate uptake rates yielded hyperbolic curves when plotted against the external phosphate concentration, indicating the existence of a saturatable transport system. The phosphate uptake rates of N-starved free-living cyano-bacteria were also examined and showed that N-starvation led to lower uptake rates. The addition of nitrate to N-starved cyanobacteria markedly increased phosphate uptake. Phosphate uptake by free and immobilized cyanobacteria was inhibited in the dark and stimulated by the presence of calcium ions or bicarbonate. No phosphate uptake was observed when a chelating agent, such as ethylenediaminetetraacetic acid (EDTA), was added to the cultures. Several bioreactors were established for initial studies in using immobilized cyanobacteria for the removal of phosphate from water. Three different types of batch fluidized-bed, as well as two continuous-flow bioreactors (i.e. fluidized- and packed-bed), were examined. Although cyanobacteria immobilized on the polymer foams did not show high phosphate uptake efficiencies, simultaneous removal of nitrate and phosphate from water by means of N-starved immobilized cyano-bacteria appeared to be a promising possibility for future development. |
| Databáze: | OpenAIRE |
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