Nutrient recovery and energy efficient algal harvest from anaerobic digestor wastewater
Journal Title: Carbon - Science and Technology - Year 2015, Vol 7, Issue 2
Abstract
The increasing levels of generation of wastewaters which are nutrient rich pose serious issues where conventional biological and chemical methods of treatment have failed in meeting sustainability challenges. In this study naturally occurring mixed algal species reared in mixotrophic growth modes have been deployed to remove recalcitrant organics and recover high nutrient concentrations (N and P) from anaerobic digestor wastewater at short residence times of 6- 7 days. Results from pilot scale operation show that the cultivation methods adopted and the use of naturally selected species lead to a tendency among these species to clump at certain stages of growth that in turn float or settle rapidly making algal harvest and thereby the nutrient recovery processes energy efficient. Algal biomass productivity in the liquid from anaerobic digestor of the consortia varied with season with a maximum of 6.3 g/m2/d.
Authors and Affiliations
Priyanka Murthy and Chanakya H. N.
Keywords
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