Abstract

Two species of the green freshwater microalga Scenedesmus have been immobilized in beads of κ-carrageenan. Growth curves were similar to those observed with free cells. The uptake of nitrogen and phosphorus from wastewater was similar for free and entrapped microalgae. The reduction of N-NH + 4 was 90% within 4 h at pH 9.0 and 70% within 5 h at an adjusted pH of ∼7.7. From these experiments, we conclude that immobilized Scenedesmus microalgae can grow well within gel beads and that they are as physiologically active for wastewater nutrient removal as free cells.

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