Summary
This study demonstrated that Chlorella vulgaris can be successfully cultivated on diluted farm-derived anaerobic digestate without pretreatment, achieving optimal growth at 4–8% (v/v) dilutions and yielding up to 1.2 g L⁻¹ dry biomass. Pilot-scale trials in a 300 L photobioreactor confirmed process feasibility with >96% nitrogen and near-complete phosphorus removal. The resulting microalgal biomass exhibited biostimulant properties, increasing tomato seed germination by 29% and root elongation by 143% at low application rates, demonstrating a circular approach to nutrient recycling and waste valorization.
Regional applicability
The study did not specify a geographic location, limiting direct applicability assessment. However, the findings are potentially relevant to United Kingdom farming systems managing livestock digestate, particularly for integrating nutrient recovery with bioproduct development. The approach aligns with circular economy principles promoted by UK agricultural policy, though local adaptation would be necessary for temperate climate conditions.
Key measures
Microalgal dry biomass yield (g L⁻¹), photosynthetic measurements, nitrogen and phosphorus removal efficiency (%), microbial community composition (metabarcoding), tomato seed germination rate (%), root elongation (%), biostimulant application rates (g L⁻¹)
Outcomes reported
The study evaluated Chlorella vulgaris growth on diluted anaerobic digestate and assessed the biostimulant properties of the resulting biomass on tomato seed germination and root elongation. Pilot-scale cultivation achieved >96% nitrogen removal and near-complete phosphorus depletion within ten days, with the biomass increasing tomato seed germination by 29% and root elongation by 143%.
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