Ammonium and urea removal by Spirulina platensis |
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Authors: | A Converti S Scapazzoni A Lodi J C M Carvalho |
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Institution: | Department of Chemical and Process Engineering, G.B. Bonino, Via Opera Pia 15, 16145, Genoa, Italy. converti@unige.it |
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Abstract: | Different concentrations either of ammonium chloride or urea were used in batch and fed-batch cultivations of Spirulina platensis to evaluate the possibility of substituting nitrate by cheaper reduced nitrogen sources in wastewaters biotreatment. The
maximum nitrogen concentration able to sustain the batch growth of this microalga without inhibition was 1.7 mM in both cases.
Ammonium chloride was limiting for the growth at lower concentrations, whereas inhibition took place at higher levels. This
inhibition effect was less marked with urea, likely because the enzymatic hydrolysis of this compound by urease controlled
the ammonia transfer into the cell. Fed-batch experiments carried out by pulse-feeding either ammonium or urea proved that
the use of these compounds as nitrogen sources can sustain the long term-cultivation of S. platensis, provided that the conditions for their feeding are accurately optimized. |
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Keywords: | Urea Ammonium Removal Spirulina platensis Kinetics |
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