We have been studying oxygen super-saturation in vertical wall photobioreactor systems. We have documented levels in excess of 55 PPM at 16 C.
55 ppm is little too high. Air saturated water contains ~300 nmoles of dissolved oxygen at 16 C. High concentrations of oxygen can promote photoinhibition. Excess of oxygen would promote generation of ROS. Kindly send me few published papers from your group, so that I can further educate myself on this.
I am attaching pdf of a book by Prof. David Walker for your reference (please see table 36.1 on page 64).
Professor Parha-Saradhi, Thank you for that feedback. I will copy you on the work we're doing on integrated sustainable infrastructure. The algae based oxygen production research is an important sub-component of that work.
Brian,
55 ppm sounds reasonable for a closed system. You will need to increase the periodicity of your degassing units within your PBR system....
Air saturated water might max out at 300 nmol O2, but I have seen 500% saturation in happy cultures that are not degassed.
What exactly are you looking for?
Hi Ben, Thanks. We are researching the utilization of algae for wastewater treatment and nutrient recovery with very promising results. We are utilizing a patented Israeli process to use the supersaturated oxygen content in lieu of aeration in secondary treatment. In researching this, we have seen as much a 700% supersaturation in a closed PBR, this does not seem possible in an open raceway system, due to atmospheric offgassing as it relates to DO. As per your comment, the 500% super-saturation reading is a relatively common event in our happy culture system. - BBS
Hi Brian,
That is very cool. I have seen data suggesting that raceways with good productivity can reach over 500% It absolutely will dig into overall biomass productivity different species have better tolerance than others...........
Yup, I came at this whole thing via research on the algae proliferation in coastal waters as a problematic condition. Turns out Algae is one of mother natures most important species as a planetary stabilization tool. Who Knew! We should touch base via e-mail. Mine is [email protected]. - BBS
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