Composition and Recycling Potential of Process Wastes from the Cultivation of Heterotrophic Microalgae
Description: Highly-productive oleaginous microalgae are primarily pursued for extraction of their valuable lipid products, leaving behind substantial cell debris and spent culture media. These materials contain considerable quantities of residual media elements (carbon, nitrogen, phosphates, minerals, salts, etc.), in addition to solubilized carbon and nitrogen compounds from cell lysis. Left untreated, these waste materials represent a considerable influx of pollutants into receiving waters and potentially present an unnecessary handling or regulatory compliance cost to the producer. This research investigates the physicochemical composition of solid and liquid waste fractions derived from a specialized heterotrophic production process for microalgae lipids to better understand the opportunities for recapturing their value. This process uses an enzymatic cell hydrolysis technique for rupturing the microalgae cells to recover lipids, which selectively targets proteinaceous cell walls. The result is a primarily liquid waste with elevated soluble protein elements in the resultant hydrolysate. In addition to the residual media, this soluble nitrogen released during lipid extraction has important implications for effluent concentrations and demands exploration of potential recycling strategies. We conclude with a discussion of some possible avenues for recycling these materials, including recycling the media internally for subsequent culture.
Keywords: Microalgae; nutrient recycling; wastewater; lipid-extraction
Conference name: CSBE/SCGAB 2016 Annual Conference, Halifax, 3-6 July 2016.
Session name: Session 2B: Bio-processing and Food Engineering II
Citation: . 2016. Composition and Recycling Potential of Process Wastes from the Cultivation of Heterotrophic Microalgae. CSBE/SCGAB 2016 Annual Conference, Halifax, 3-6 July 2016.
Publisher: Canadian Society for Bioengineering
Language 1: en
Rights: Canadian Society for Bioengineering