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Updated: Jan 27, 2026

Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
Ammonium removal potential and its conversion pathways by free and immobilized Scenedesmus obliquus from wastewater
Xiang Liu1, Kaijun Wang1, Jin Zhang2
1State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 10084, PR China.
Abstract:
In this study, the immobilization with sodium alginate (SA) for cultivating microalgae in entrapped matrix gel beads was conducted for separating it from water. Batch experiments with a period of 5 days were carried out for free and immobilized Scenedesmus obliquus simultaneously under two trophic modes, to compare the removal performances of different initial ammonium (NH4+-N) concentrations. In both free and immobilized form, the positive C-dependent effect in mixotrophy and the negative N-dependent effect in heterotrophy were observed. And the performances of immobilized form were all superior to that of free form, which showed greater tolerance to high concentration, maximally representing 96.6 ± 0.1% removal in 50 mg/L of NH4+-N in mixotrophy. Assimilation of NH4+-N was the main removal pathway resulting the protein synthesis with the dominant component including glutamic acid (Glu), cystine (Cys), arginine (Arg) and proline (Pro). The results demonstrated a systematic understanding for NH4+-N removal in microalgae-based system.
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