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In a tubular photobioreactor, a degassing column is often used for oxygen removal and carbon dioxide addition. The column may limit growth because the conditions are optimal only right after the degassing zone. In the present study, we tested continuous oxygen removal and nutrient delivery by placing a porous membrane tube inside a photobioreactor tube. The(More)
Traditional pulp and paper industry in Western countries is in transition phase due to increased costs and competition, decreased prices and changes in consumption habits. Biorefineries — factories that process biomass into variety of products — are seen as one way to extend the product portfolio and to open up new business opportunities. The main objective(More)
In recirculating aquaculture, a bacterial biofilter is applied to convert ammonium, excreted by the fish, to the non-toxic nitrate. Unfortunately, nitrifying bacteria produce off-flavor compounds that lower fish quality. We investigated, by calculations and estimations, possibilities to replace the biofilter by autotrophic organisms that incorporate(More)
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