Microalgae Production on Biogas Digestate in Sub-Alpine Region of Europe—Development of Simple Management Decision Support Tool

Lara Resman, Maja Berden Zrimec, Vid Žitko, Borut Lazar, Robert Reinhardt, Ana Cerar and Rok Mihelič ()
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Lara Resman: Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia
Maja Berden Zrimec: AlgEn, Algal Technology Centre, LLC, Brnčičeva 29, 1231 Ljubljana, Slovenia
Vid Žitko: Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia
Borut Lazar: AlgEn, Algal Technology Centre, LLC, Brnčičeva 29, 1231 Ljubljana, Slovenia
Robert Reinhardt: AlgEn, Algal Technology Centre, LLC, Brnčičeva 29, 1231 Ljubljana, Slovenia
Ana Cerar: AlgEn, Algal Technology Centre, LLC, Brnčičeva 29, 1231 Ljubljana, Slovenia
Rok Mihelič: Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia

Sustainability, 2023, vol. 15, issue 24, 1-25

Abstract: In a one-and-a-half-year study conducted in the ALS6 region in Europe (Ljubljana, Slovenia), the cultivation of microalgae in anaerobic digestate from food waste, mainly Scenedesmus dimorphus and Scenedesmus quadricauda , was investigated in three ponds (1260 L each) under a greenhouse. The effects of changing digestate quality and quantity as well as seasonal fluctuations on the productivity of the microalgae were investigated in three stages: Learning/Design (SI), Testing (SII), and Verification/Calibration (SIII). A decision support tool (DST) was developed using easy-to-measure parameters such as pH, temperature, electrical conductivity, mineral nitrogen forms and physical, biological parameters (OD, delayed fluorescence intensity). To control optimal pond operation, we proposed the photosynthetic culture index (PCI) as an early indicator for necessary interventions. Flocculation and nitrite levels (above 3 mg NO 2 -N L −1 ) were signals for the immediate remediation of the algae culture. Under optimal conditions in summer SIII, an average algal biomass production of 11 ± 1.5 g m −2 day −1 and a nitrogen use efficiency of 28 ± 2.6 g biomass/g N-input were achieved with the developed DST. The developed DST tool was, in this study, successfully implemented and used for the cultivation of microalgae consortia predominated by Scenedesmus dimorphus and S. quadricauda with biogas digestate. DST offers the possibility to be modified according to producers’ specific needs, facility, digestate and climate conditions, and as such, could be used for different microalgae cultivation processes with biogas digestate as a food source.

Keywords: circular economy; anaerobic digestion; food waste digestate; microalgae Scenedesmus; open ponds; decision support tool (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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