Investigating why recycling gravity harvested algae increases harvestability and productivity in high rate algal ponds

Water Research
J B K ParkA Shilton

Abstract

It has previously been shown that recycling gravity harvested algae promotes Pediastrum boryanum dominance and improves harvestability and biomass production in pilot-scale High Rate Algal Ponds (HRAPs) treating domestic wastewater. In order to confirm the reproducibility of these findings and investigate the mechanisms responsible, this study utilized twelve 20 L outdoor HRAP mesocosms operated with and without algal recycling. It then compared the recycling of separated solid and liquid components of the harvested biomass against un-separated biomass. The work confirmed that algal recycling promoted P. boryanum dominance, improved 1 h-settleability by >20% and increased biomass productivity by >25% compared with controls that had no recycling. With regard to the improved harvestability, of particular interest was that recycling the liquid fraction alone caused a similar improvement in settleability as recycling the solid fraction. This may be due to the presence of extracellular polymeric substances in the liquid fraction. While there are many possible mechanisms that could account for the increased productivity with algal recycling, all but two were systematically eliminated: (i) the mean cell residence time was extended the...Continue Reading

References

Nov 7, 2002·Water Research·Jennifer I HoughtonTom Stephenson
Oct 21, 2005·Water Research·Jen-Jeng Chen, Hsuan-Hsien Yeh
Jun 27, 2007·Water Science and Technology : a Journal of the International Association on Water Pollution Research·S HeubeckA Shilton
Nov 3, 2009·Applied Biochemistry and Biotechnology·Ashish BhatnagarK C Das
Feb 13, 2010·Water Science and Technology : a Journal of the International Association on Water Pollution Research·J B K Park, R J Craggs
Jul 3, 2010·Bioresource Technology·Jon K PittmanOlumayowa Osundeko
Jul 3, 2010·Bioresource Technology·Peter K CampbellDavid Batten
Aug 3, 2010·Bioresource Technology·J B K ParkA N Shilton
Feb 19, 2011·Water Science and Technology : a Journal of the International Association on Water Pollution Research·R J CraggsJ R Benemann
Feb 19, 2011·Water Science and Technology : a Journal of the International Association on Water Pollution Research·G A C Ehlers, S J Turner
Jun 1, 1967·Journal of Phycology·J S Davis

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Citations

Feb 27, 2015·Asian-Australasian Journal of Animal Sciences·T K V VuS Bruun
Mar 24, 2020·International Journal of Environmental Health Research·Marilia Garcez Corrêa da SilvaAna Luiza Muccillo-Baisch

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