Bioresource technology | 2021
Basic oxygen furnace slag as a support material for the cultivation of indigenous marine microalgae.
Abstract
Attached cultivation of microalgae is a suitable strategy for attaining high biomass productivity with effortless harvesting. This study evaluates the feasibility of using Basic Oxygen Furnace Slag (BOFS) as a carrier for microalgae cultivation. Among the three indigenous microalgae (namely, Chlorella sorokiniana PTC13, Tetraselmis suecica SC5, and Nannochloropsis oceanica DG), which were examined for their capability of attached growth on BOFS, T. suecica SC5 showed the best attached-growth performance (2.52\xa0mg/g slag). Optimizing the cultivation parameters (agitation rate, 200\xa0rpm; added sodium acetate, 1 g/L; light intensity, 300\xa0µmol/m2/s) further enhanced the attached biomass yield to 6.38\xa0mg/g slag. The microalgae-attached slag can be used as the seed for re-growth for three additional cycles and the biomass yield and productivity both enhanced from 6.00 to 11.58\xa0mg/g slag and 497 to 760\xa0mg/L/d, respectively. This study demonstrated the potential of using T. suecica SC5-attached BOFS to construct artificial reefs.