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Passively immobilized cyanobacteria Nostoc species BB 92.2 in a moving bed photobioreactor (MBPBR): Design, cultivation, and characterization

J. Walther,N. Erdmann,Michael Stoffel,Katharina Wastian,A. Schwarz,D. Strieth,K. Muffler,R. Ulber

Published 2022 in Biotechnology and Bioengineering

ABSTRACT

The cyanobacterium Nostoc sp. BB 92.3. had shown antibacterial activity. A cultivation as biofilm, a self‐forming matrix of cells and extracellular polymeric substances, increased the antibacterial effect. A new photobioreactor system was developed that allows a surface‐associated cultivation of Nostoc sp. as biofilm. High‐density polyethylene carriers operated as a moving bed were selected as surface for biomass immobilization. This system, well established in heterotrophic wastewater treatment, was for the first time used for phototrophic biofilms. The aim was a cultivation on a large scale without inhibiting growth while maximizing immobilization. Cultivation in a small photobioreactor (1.5 L) with different volumetric filling degrees of carriers (13.4%–53.8%) in a batch process achieved immobilization rates of 70%–85% and growth was similar to a no‐carrier‐control. In a larger photobioreactor (65 L) essentially all of the biomass was immobilized on the carriers and the space‐time yield of biomass (0.018 gcell dry weight L−1 day−1) was competitive compared to phototrophic biofilm cultivations from literature. The use of carriers increased the gas exchange in the reactor by a factor of 2.5–3 but doubled the mixing time. Enriched gassing with carbon dioxide resulted in a short‐term increase in growth rate, but unexpectedly it also adversely changed the growth morphology.

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