Utilization of cyanobacteria in photobioreactors for orthophosphate removal from water |
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Authors: | Gaffney Alexea M Markov Sergei A Gunasekaran M |
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Institution: | (1) Department of Biology, Fisk University, 37208 Nashville, TN;(2) Present address: Division of Biological Sciences, Marshall University, 400 Hal Greer Boulevard, 25755-2510 Huntington, WV |
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Abstract: | The effectiveness of photosynthetic free-living and polyurethane foam (PU) immobilized Anabaena variabilis cells for, removal of orthophosphate (P) from water in batch cultures and in a photobioreactor was studied. Immobilization
in PU foams was found to have a positive effect on P uptake by cyanobacteria in batch cultures. The efficiency of P uptake
by immobilized cells was higher than by free-living cells. A laboratory scale photobioreactor was constructed for removal
of P from water by the immobilized cyanobacteria. The photobioreactor was designed so that the growth medium (water) from
a reservoir was pumped through a photobioreactor column with immobilized cyanobacteria and back to the reservoir. This created
a closed system in which it was possible to measure P uptake. No leakage of cells into the photobioreactor medium reservoir
was observed during the operation. The immobilized cells incorporated into a photobioreactor column removed P continuously
for about 15 d. No measurable uptake was demonstrated after this period. Orthophosphate uptake efficiency of 88–92% was achieved
by the photobioreactor. |
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Keywords: | Orthophosphate water clean-up immobilization cyanobacteria photobioreactor |
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