Growth and biomass productivity of Scenedesmus vacuolatus on a twin layer system and a comparison with other types of cultivations.

Abstract:

:Scenedesmus is a genus of microalgae employed for several industrial uses. Industrial cultivations are performed in open ponds or in closed photobioreactors (PBRs). In the last years, a novel type of PBR based on immobilized microalgae has been developed termed porous substrate photobioreactors (PSBR) to achieve significant higher biomass density during cultivation in comparison to classical PBRs. This work presents a study of the growth of Scenedesmus vacuolatus in a Twin Layer System PSBR at different light intensities (600 μmol photons m-2 s-1 or 1000 μmol photons m-2 s-1), different types and concentrations of the nitrogen sources (nitrate or urea), and at two CO2 levels in the gas phase (2% or 0.04% v/v). The microalgal growth was followed by monitoring the attached biomass density as dry weight, the specific growth rate and pigment accumulation. The highest productivity (29 g m-2 d-1) was observed at a light intensity of 600 μmol photons m-2 s-1 and 2% CO2. The types and concentrations of nitrogen sources did not influence the biomass productivity. Instead, the higher light intensity of 1000 μmol photons m-2 s-1 and an ambient CO2 concentration (0.04%) resulted in a significant decrease of productivity to 18 and 10-12 g m-2 d-1, respectively. When compared to the performance of similar cultivation systems (15-30 g m-2 d-1), these results indicate that the Twin Layer cultivation System is a competitive technique for intensified microalgal cultivation in terms of productivity and, at the same time, biomass density.

authors

Carbone DA,Olivieri G,Pollio A,Gabriele,Melkonian M

doi

10.1007/s00253-017-8515-y

subject

Has Abstract

pub_date

2017-12-01 00:00:00

pages

8321-8329

issue

23-24

eissn

0175-7598

issn

1432-0614

pii

10.1007/s00253-017-8515-y

journal_volume

101

pub_type

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