Is it possible to notice an increase in phosphorus concentration in batch cultures of microalgae strains after several days of normal decrease of nutrients?
Is your culture axenic?
If not, bacterial recycling of nutrients from DOM excreted by the microalgae can explain the increase in phosphorous.
During batch culture experiments under axenic and non-axenic cultures I found the same at the end of the exponential phase when Silicate and Nitrate run out, but only in the experiment with bacteria added.
Tobias Vonnahme Thank you very much for your answer.
Actually, our cultures are not axenic.
Is there any relevant reference that you could maybe recommend?
Yes and this trend occurred in my own work. You can find out here Article Using Microalgae to Remediate Food and Bio- Digester Effluen...
Mostly, a lot factors can contribute to the back release of P into the system. pH fluctuations can result in "deceptive P removal", algae DOM and stress could release P back into the system. luxury uptake can also create this scenario when N:P ratio is high skewed, algae by luxury uptake could prefer the highly concentrated element over the low concentrated one until a point where there is enough accumulation of the lower concentrated species to be removed.- Badges
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