Optimizing resource recovery from wastewater with algae-bacteria membrane reactors

Casagli, Francesca; Béline, Fabrice; Ficara, Elena; Bernard, Olivier

doi:10.1016/j.cej.2022.138488

Cited by 17 publications

(1 citation statement)

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“…They also sequester CO 2 from the atmosphere. In wastewater treatment plants, they reduce energy costs by 50% by providing bacteria with the oxygen needed for biological treatment [3]. In turn, wastewater enables more economical large-scale production without the need for large quantities of quality water and expensive commercial growth media [4].…”

Section: Introductionmentioning

confidence: 99%

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

Resman,

Berden Zrimec,

Žitko

et al. 2023

Sustainability

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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 NO2-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.

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Section: Introductionmentioning

confidence: 99%