| Title | Bioremediation of brewery wastewater using Arthrospira sp.: Preliminary assessment of biomass as a biofertilizer toward circular economy |
|---|---|
| ID_Doc | 21300 |
| Authors | Silva, A; Kurpan, D; de Moura, MR; dos Santos, AC; Silva, TD; Novo, BD; Santo, ID; Balata, LQ; de Assis, LC; Barbarino, E; Freire, DMG; do Valle, AF |
| Title | Bioremediation of brewery wastewater using Arthrospira sp.: Preliminary assessment of biomass as a biofertilizer toward circular economy |
| Year | 2024 |
| Published | |
| Abstract | Microalgae have been pointed out as promising agents for the bioremediation of wastewater from numerous sources. One of the main advantages of such technology is the production of valuable biomass to be exploited in other processes, increasing the sustainability and circularity of the system. In this study, untreated brewery wastewater was used as culture medium for Arthrospira sp. on a pilot-scale setup positioned within the production site of Nova Rio brewery (Rio de Janeiro, Brazil). The resulting biomass was then preliminarily assessed as a biofertilizer for barley (Hordeum vulgare) growth. First, the optimal concentration for the inoculum was determined in lab-scale cultures that were subsequentially scaled up to start a 300-L cultivation of Arthrospira sp. in a 1.55-m(2) open raceway pond. After 100 days of semi-continuous cultivation with a dilution of 0.35 on feeding days, the resulting dry biomass was finally tested as a biofertilizer in different degrees of substitution of a commercial mineral fertilizer. Using an optimal inoculum concentration of 0.5 g L-1, the onsite pilot-scale cultivation of Arthrospira sp. using Nova Rio's brewery effluent reached an average biomass productivity of 10.68 +/- 5.13 g m(-2) day(-1). Nitrate, ammonium, and sulfate were successfully removed according to the Brazilian regulations (56.8, 100, and 78.7% removal, respectively). Preliminary biofertilization assays showed that 50% and 100% substitution of commercial fertilizer with raw Arthrospira sp. biomass resulted in faster barley growth (similar to 60%) when compared to solely commercial fertilizer, indicating a promising area for further research and investment. |
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