E2.02A Henkanatte_Gedara 2017 ReNUWIt Annual Meeting Poster

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Abstract/Contents

Abstract: A pilot scale version of the Photosynthetically Oxygenated Waste-to-Energy Recovery (POWER) system developed under ReNUWIt has been deployed at an urban wastewater treatment plant. This POWER system utilizes Galdieria sulphuraria, an extremophilic algal strain, to remove dissolved organic carbon and nutrients in primary-settled wastewater mixotrophically to the respective discharge standards and to simultaneously generate energy-rich biomass. The POWER system embodies hydrothermal liquefaction (HTL) to recover the energy and nutrients from the biomass harvested from the cultivation step.
In this research, pH adjustment is evaluated as a means of autoflocculating the algal biomass to minimize the energy input for harvesting the biomass. Bench scale results showed that biomass recoveries >95% could be realized within 15 minutes by raising the cultivation pH of 4.0 to a pH of 7.0. An energy analysis showed that anaerobic digestion of the biomass harvested in this manner, for example, could recover higher net energy compared to harvesting by centrifugation as being done today.

Type of resource	other
Date created	May 2017

Author	Henkanatte-Gedera, Shanka
Author	Nirmalakhandan, Nagamany

Subject	Re-inventing the Nation’s Urban Water Infrastructure
Subject	ReNUWIt
Subject	E2.02A
Subject	Efficient Engineered Systems
Subject	Energy and resource recovery
Subject	Las Cruces Wastewater Treatment Plant
Subject	Las Cruces
Subject	New Mexico
Subject	algae
Subject	biofuel production
Subject	biomass
Subject	cultures
Subject	field demonstration
Subject	galdieria sulphuraria
Subject	growth
Subject	hydrothermal liquefaction
Subject	microalgae
Subject	nutrients
Subject	nutrient removal
Subject	photosynthesis
Subject	removal
Subject	urban wastewaters
Subject	wastewater treatment

Related Publication	Henkanatte-Gedera, S. M., Selvaratnam, T., Caskan, N., Nirmalakhandan, N., Van Voorhies, W., & Lammers, P. J. (2015). Algal-based, single-step treatment of urban wastewaters. Bioresource Technology, 189, 273-278. http://doi.org/10.1016/j.biortech.2015.03.120
Related Publication	Henkanatte-Gedera, S. M., Selvaratnam, T., Karbakhshravari, M., Myint, M., Nirmalakhandan, N., Van Voorhies, W., & Lammers, P. J. (2017). Removal of dissolved organic carbon and nutrients from urban wastewaters by Galdieria sulphuraria: Laboratory to field scale demonstration. Algal Research-Biomass Biofuels and Bioproducts, 24, 450-456. http://doi.org/10.1016/j.algal.2016.08.001
Location	https://purl.stanford.edu/bp709vr2421

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Preferred Citation: Henkanatte-Gedera, Shanka and Nirmalakhandan, Nagamany. (2017). E2.02A Henkanatte_Gedara 2017 ReNUWIt Annual Meeting Poster. Stanford Digital Repository. Available at: https://purl.stanford.edu/bp709vr2421

Re-inventing the Nation's Urban Water Infrastructure (ReNUWIt)

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